Today's Message Index:
----------------------
1. 04:04 AM - Re: Re: Another newbie question: (Pat Ladd)
2. 04:25 AM - Re: landing lights (Thom Riddle)
3. 05:52 AM - Re: Another Kolb joins the ranks (Kip)
4. 07:55 AM - Grounded - 912UL Voltage Problem (John Bickham)
5. 08:10 AM - Re: Grounded - 912UL Voltage Problem (John Hauck)
6. 08:46 AM - Re: Grounded - 912UL Voltage Problem (Dickk9@AOL.COM)
7. 09:06 AM - Re: Grounded - 912UL Voltage Problem (Richard Girard)
8. 10:58 AM - voltage reg (b young)
9. 11:47 AM - Handheld radio to external antenna connections? (Bob Kravis)
10. 12:01 PM - Re: Handheld radio to external antenna connections? (russ kinne)
11. 12:35 PM - Re: Handheld radio to external antenna connections? (Bob Kravis)
12. 12:53 PM - Re: Handheld radio to external antenna connections? (Bob Kravis)
13. 04:19 PM - Re: Handheld radio to external antenna connections? (Richard Girard)
14. 05:03 PM - Re: Handheld radio to external antenna connections? (Dana Hague)
15. 05:50 PM - Re: Handheld radio to external antenna connections? (Charlie England)
16. 06:39 PM - Re: Handheld radio to external antenna connections? (Gene & Tammy)
17. 07:01 PM - Re: Handheld radio to external antenna connections? (Herb)
18. 07:31 PM - Re: Handheld radio to external antenna connections? (Charlie England)
19. 07:46 PM - Re: Grounded - 912UL Voltage Problem (John Bickham)
20. 08:11 PM - Re: Handheld radio to external antenna connections? (John Hauck)
21. 08:25 PM - Kolbra For Sale (shad)
Message 1
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| Subject: | Re: Another newbie question: |
Hi larry,
i could tell straight away that it was not intended to be insulting from
the way you apologised in case it was.
Actually I think we have 3 altimeter setting areas to cover the country.
Close attention to these enables us to look out of the cockpit and avoid
Ben Nevis and Scafell Pike (978 metres). Snowdon pokes up a little way
as well. The lowest point is 4metres (about 13ft to you) below sea
level.Miles away. Probably a200 miles or more (just)
I still think that it a bit wacky to have to engage in mental arithmetic
by flying on sea level pressure to calculate a landing height at some
arbitrary figure instead of everyone flying the circuit at the same
height and landing at zero on the clock
Pat
----- Original Message -----
From: Larry Cottrell
To: kolb-list@matronics.com
Sent: Friday, July 16, 2010 1:52 PM
Subject: Re: Kolb-List: Re: Another newbie question:
Not to mention that the entire island is small enough that there is
probably only one setting you need to make to have your altimeter read
the right altitude no matter where you are. Not sure if there is any
terrain much above flood stage anyway? Keep in mind that the above is
not intended to insult, although the likelihood is probable, allow me to
apologize beforehand.
Larry
Note: If you forward this email, please delete the forwarding history,
which includes my email address.
----- Original Message -----
From: b young
To: kolb-list@matronics.com
Sent: Friday, July 16, 2010 7:27 AM
Subject: Re: Kolb-List: Re: Another newbie question:
Circuit height usually 1000ft for light a/c etc and 800 or 600 for
microlights.Not sure if there is a `best` way, probably what you are
used to but at that stage of the flight the height above ground is
paramount and if you land with zero alt. on the clock it seems simpler
to me
Cheers Pat
>>>>>>>>>>>>>>>>>>>>>. landing may be easier,,, but if you encounter
another aircraft in route are looking for him in the air in an effort
of not trading paint... altitude above sea level should be more
consistent way of knowing where to look. boyd
href="http://www.matronics.com/Navigator?Kolb-List">http://www.matronic
s.com/Navigator?Kolb-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
-------------------------------------------------------------------------
-----
Checked by AVG - www.avg.com
07/25/10 11:36:00
Message 2
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| Subject: | Re: landing lights |
Will,
That resembles the scene of a five alarm fire.
Those lights should get anyone's attention except for the blind. Perhaps the addition
of a Klaxon would help you to be seen and heard :-).
do not archive
--------
Thom Riddle
Buffalo, NY (9G0)
Kolb Slingshot SS-021
Jabiru 2200A #1574
Tennessee Prop 64x32
The truth will set you free. But first, it will piss you off.
- Gloria Steinem
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306650#306650
Message 3
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| Subject: | Re: Another Kolb joins the ranks |
Saw it at OSH.
You ought to win something... :D
--------
2000 Firestar II
R503 DCDI
VLS 750
2010 Waiex
Jabiru 3300
1980 Quickie 1
Electric?
Needs restoration!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306660#306660
Message 4
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| Subject: | Grounded - 912UL Voltage Problem |
Just checking if someone has some advice to share regarding 912 voltage problems.
I've been trying to trace down a voltage surge on my 912UL. Last flight started
noticing intermittent voltage surge to 16 plus volts. Been checking wiring
and connections, nothing yet. Ran engine this morning and now surge is rpm dependent.
High rpm = increasing voltage. My only guess is that the voltage regulator
has gone bad. Fixing to order a new one. Wondering if anyone has any
experiences or advice that they can offer. Are there any checks that can be
preformed on the regulator itself? I'm electrically challenged. Don't know if
stator could be problem.
This one is going on 10 years old. I'm slowly becoming more tolerant and understanding
of things getting old and not working as well as new.
Been trying get plane XC ready to visit a new Kolb, a crippled Kolb driver and
daughter in Montgomery, AL. Just hitting a few bumps.
Any help appreciated.
--------
Thanks too much,
John Bickham
Mark III-C w/ 912UL
St. Francisville, LA
I know many pilots and a few true aviators. There is a distinct difference that
I have the greatest respect for.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306676#306676
Message 5
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| Subject: | Re: Grounded - 912UL Voltage Problem |
John B/Gang:
My experience is a bad regulator/rectifier when they fail on the high side.
Scared to ask how much they want for a replacement.
When are you headed this way? We'll get Gantt International Airport cut for
you.
john h
mkIII
> Been trying get plane XC ready to visit a new Kolb, a crippled Kolb
driver and daughter in Montgomery, AL. Just hitting a few bumps.
>
> John Bickham
Message 6
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| Subject: | Re: Grounded - 912UL Voltage Problem |
Make sure all of your grounds are good between regulator, battery, and
engine.
Message 7
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| Subject: | Re: Grounded - 912UL Voltage Problem |
John, The regulator for the Rotax alternator is a diode bridge to rectify
the AC voltage to DC. If you have a multimeter check the out put of the
regulator to see if it's letting AC through. If it is, one or more of the
diodes have given up and a new regulator will fix you up. Check over on the
Aeroelectric forum, also on Matronics, for more ideas if that isn't the
case.
Rick Girard
On Thu, Jul 29, 2010 at 10:45 AM, <Dickk9@aol.com> wrote:
> Make sure all of your grounds are good between regulator, battery, and
> engine.
>
> *
>
> *
>
>
Message 8
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john..
I think you have it figured out... the stator is just a winding of
wire in which a magnet passes by... the output is determined by rpm....
the voltage regulator is designed to control the output voltage at all
rpm's.........
I just had pause to think...
it seems that on the voltage regulator there is a line called a sence
line.... it can be connected directly to the positive output if the
runs are short.... if they are long, the sence line is to run from
the battery to the sence input... if there is any voltage loss in the
lines the voltage regulator increases the voltage on its output so
that the voltage loss from distance is compensated for and the battery
receives the proper voltage.... if the sence line has a bad
connection,,, or has lost a connection,,, the regulator may be
overcompensating for what it thinks is a voltage loss in the system...
hope this helps..
Boyd Young
Message 9
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| Subject: | Handheld radio to external antenna connections? |
Hi,
I followed the suggestions I found in the archives and purchased an ICOM-A24
and a Stainless Steel VHS Antenna - 45 degree. The radio will mount via its
belt clip into a custom bracket between the forward edge of the seat and the
floor plate (aluminum diamond plate) in my Firefly. The antenna will be
mounted through the floor plate and extend below and back through the belly
fabric. That's the plan. There were no instructions sent from Aircraft
Spruce (part #11-04517) and the support tech was not very helpful in how to
wire it up. The ICOM support guy said most of the antennae come with a coax
cable and BNC female that you just pug in to the radio. Mine doesn't. Now
the antenna has a knurled aluminum shouldered spacer, through the center of
which, the SS antenna rod runs. There are nuts at each end which squeeze
the assembly together. There is no provision for electrical connection. I
will have to fabricate a cable with a BNC connector.
1. What is the correct cable connection? Does the insulated center wire go
to the antenna rod end and the sheath go to the aluminum floor plate or
what? It does not appear that the antenna rod is electrically isolated from
the mounting hole in the floor plate so I don't see how that would work?
Google searches for antenna connections have not been fruitful.
2. I have the adapter for the handheld and will be installing a small panel
with audio and mic jacks. There is some very expensive cabling available to
wire this up but what is really needed to get a clean, ignition noise free
signal?
Thanks for your input.
Bob
E008BK at 9NC8
Message 10
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| Subject: | Re: Handheld radio to external antenna connections? |
Bob
I'd suggest first asking ICOM about this
On Jul 29, 2010, at 2:46 PM, Bob Kravis wrote:
> Hi,
> I followed the suggestions I found in the archives and purchased an
> ICOM-A24 and a Stainless Steel VHS Antenna - 45 degree. The radio
> will mount via its belt clip into a custom bracket between the
> forward edge of the seat and the floor plate (aluminum diamond
> plate) in my Firefly. The antenna will be mounted through the
> floor plate and extend below and back through the belly fabric.
> That's the plan. There were no instructions sent from Aircraft
> Spruce (part #11-04517) and the support tech was not very helpful
> in how to wire it up. The ICOM support guy said most of the
> antennae come with a coax cable and BNC female that you just pug in
> to the radio. Mine doesn't. Now the antenna has a knurled
> aluminum shouldered spacer, through the center of which, the SS
> antenna rod runs. There are nuts at each end which squeeze the
> assembly together. There is no provision for electrical
> connection. I will have to fabricate a cable with a BNC connector.
> 1. What is the correct cable connection? Does the insulated center
> wire go to the antenna rod end and the sheath go to the aluminum
> floor plate or what? It does not appear that the antenna rod is
> electrically isolated from the mounting hole in the floor plate so
> I don't see how that would work? Google searches for antenna
> connections have not been fruitful.
> 2. I have the adapter for the handheld and will be installing a
> small panel with audio and mic jacks. There is some very expensive
> cabling available to wire this up but what is really needed to get
> a clean, ignition noise free signal?
> Thanks for your input.
> Bob
> E008BK at 9NC8
>
>
Message 11
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| Subject: | Re: Handheld radio to external antenna connections? |
I did Russ, they sent a generic email as I quoted. I'll try calling them.
Thanks, bk
On Thu, Jul 29, 2010 at 3:00 PM, russ kinne <russkinne@mac.com> wrote:
> Bob
> I'd suggest first asking ICOM about this
>
>
> On Jul 29, 2010, at 2:46 PM, Bob Kravis wrote:
>
> Hi,
> I followed the suggestions I found in the archives and purchased an
> ICOM-A24 and a Stainless Steel VHS Antenna - 45 degree. The radio will
> mount via its belt clip into a custom bracket between the forward edge of
> the seat and the floor plate (aluminum diamond plate) in my Firefly. The
> antenna will be mounted through the floor plate and extend below and back
> through the belly fabric. That's the plan. There were no instructions sent
> from Aircraft Spruce (part #11-04517) and the support tech was not very
> helpful in how to wire it up. The ICOM support guy said most of the
> antennae come with a coax cable and BNC female that you just pug in to the
> radio. Mine doesn't. Now the antenna has a knurled aluminum shouldered
> spacer, through the center of which, the SS antenna rod runs. There are
> nuts at each end which squeeze the assembly together. There is no provision
> for electrical connection. I will have to fabricate a cable with a BNC
> connector.
> 1. What is the correct cable connection? Does the insulated center wire go
> to the antenna rod end and the sheath go to the aluminum floor plate or
> what? It does not appear that the antenna rod is electrically isolated from
> the mounting hole in the floor plate so I don't see how that would work?
> Google searches for antenna connections have not been fruitful.
> 2. I have the adapter for the handheld and will be installing a small panel
> with audio and mic jacks. There is some very expensive cabling available to
> wire this up but what is really needed to get a clean, ignition noise free
> signal?
> Thanks for your input.
> Bob
> E008BK at 9NC8
>
> *
>
> href="http://www.matronics.com/Navigator?Kolb-List">http://www.matronics.com/Navigator?Kolb-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
> *
>
>
Message 12
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| Subject: | Re: Handheld radio to external antenna connections? |
I called ICOM and was told that as suspected the center wire of the sheathed
wire goes to the antenna rod. But, the sheath (copper braid) termination
was uncertain. They suggested I track the mfr. down for advice. I went
back to the AS catalog and see that the knurled spacers are Delrin, not
anodized aluminum as previously thought. So there is insulation between the
antenna rod and the floor plate. ICOM also said that the load across the
antenna port on the handheld must be 50 ohms or greater, else you overheat
the transmitter output and cook it! Now I wonder if I need to put a
resistor (5 watt?) between the antenna and the floor plate? I'll post back
when I get an answer.
bk
On Thu, Jul 29, 2010 at 3:35 PM, Bob Kravis <bob.kravis@gmail.com> wrote:
> I did Russ, they sent a generic email as I quoted. I'll try calling them.
> Thanks, bk
>
>
> On Thu, Jul 29, 2010 at 3:00 PM, russ kinne <russkinne@mac.com> wrote:
>
>> Bob
>> I'd suggest first asking ICOM about this
>>
>>
>> On Jul 29, 2010, at 2:46 PM, Bob Kravis wrote:
>>
>> Hi,
>> I followed the suggestions I found in the archives and purchased an
>> ICOM-A24 and a Stainless Steel VHS Antenna - 45 degree. The radio will
>> mount via its belt clip into a custom bracket between the forward edge of
>> the seat and the floor plate (aluminum diamond plate) in my Firefly. The
>> antenna will be mounted through the floor plate and extend below and back
>> through the belly fabric. That's the plan. There were no instructions sent
>> from Aircraft Spruce (part #11-04517) and the support tech was not very
>> helpful in how to wire it up. The ICOM support guy said most of the
>> antennae come with a coax cable and BNC female that you just pug in to the
>> radio. Mine doesn't. Now the antenna has a knurled aluminum shouldered
>> spacer, through the center of which, the SS antenna rod runs. There are
>> nuts at each end which squeeze the assembly together. There is no provision
>> for electrical connection. I will have to fabricate a cable with a BNC
>> connector.
>> 1. What is the correct cable connection? Does the insulated center wire go
>> to the antenna rod end and the sheath go to the aluminum floor plate or
>> what? It does not appear that the antenna rod is electrically isolated from
>> the mounting hole in the floor plate so I don't see how that would work?
>> Google searches for antenna connections have not been fruitful.
>> 2. I have the adapter for the handheld and will be installing a small
>> panel with audio and mic jacks. There is some very expensive cabling
>> available to wire this up but what is really needed to get a clean, ignition
>> noise free signal?
>> Thanks for your input.
>> Bob
>> E008BK at 9NC8
>>
>> *
>>
>> href="http://www.matronics.com/Navigator?Kolb-List">http://www.matronics.com/Navigator?Kolb-List
>> href="http://forums.matronics.com">http://forums.matronics.com
>> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>> *
>>
>>
>>
>
Message 13
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| Subject: | Re: Handheld radio to external antenna connections? |
Bob, the 50 ohm spec is supplied by using the right coax cable. Go to your
local Radio Shack and you may be able to buy a cable ready made and only
fabricate a ground plane for the antenna.
Rick Girard
On Thu, Jul 29, 2010 at 2:53 PM, Bob Kravis <bob.kravis@gmail.com> wrote:
> I called ICOM and was told that as suspected the center wire of the
> sheathed wire goes to the antenna rod. But, the sheath (copper braid)
> termination was uncertain. They suggested I track the mfr. down for advice.
> I went back to the AS catalog and see that the knurled spacers are Delrin,
> not anodized aluminum as previously thought. So there is insulation between
> the antenna rod and the floor plate. ICOM also said that the load across
> the antenna port on the handheld must be 50 ohms or greater, else you
> overheat the transmitter output and cook it! Now I wonder if I need to put
> a resistor (5 watt?) between the antenna and the floor plate? I'll post back
> when I get an answer.
> bk
>
>
> On Thu, Jul 29, 2010 at 3:35 PM, Bob Kravis <bob.kravis@gmail.com> wrote:
>
>> I did Russ, they sent a generic email as I quoted. I'll try calling them.
>> Thanks, bk
>>
>>
>> On Thu, Jul 29, 2010 at 3:00 PM, russ kinne <russkinne@mac.com> wrote:
>>
>>> Bob
>>> I'd suggest first asking ICOM about this
>>>
>>>
>>> On Jul 29, 2010, at 2:46 PM, Bob Kravis wrote:
>>>
>>> Hi,
>>> I followed the suggestions I found in the archives and purchased an
>>> ICOM-A24 and a Stainless Steel VHS Antenna - 45 degree. The radio will
>>> mount via its belt clip into a custom bracket between the forward edge of
>>> the seat and the floor plate (aluminum diamond plate) in my Firefly. The
>>> antenna will be mounted through the floor plate and extend below and back
>>> through the belly fabric. That's the plan. There were no instructions sent
>>> from Aircraft Spruce (part #11-04517) and the support tech was not very
>>> helpful in how to wire it up. The ICOM support guy said most of the
>>> antennae come with a coax cable and BNC female that you just pug in to the
>>> radio. Mine doesn't. Now the antenna has a knurled aluminum shouldered
>>> spacer, through the center of which, the SS antenna rod runs. There are
>>> nuts at each end which squeeze the assembly together. There is no provision
>>> for electrical connection. I will have to fabricate a cable with a BNC
>>> connector.
>>> 1. What is the correct cable connection? Does the insulated center wire
>>> go to the antenna rod end and the sheath go to the aluminum floor plate or
>>> what? It does not appear that the antenna rod is electrically isolated from
>>> the mounting hole in the floor plate so I don't see how that would work?
>>> Google searches for antenna connections have not been fruitful.
>>> 2. I have the adapter for the handheld and will be installing a small
>>> panel with audio and mic jacks. There is some very expensive cabling
>>> available to wire this up but what is really needed to get a clean, ignition
>>> noise free signal?
>>> Thanks for your input.
>>> Bob
>>> E008BK at 9NC8
>>>
>>> *
>>>
>>> href="http://www.matronics.com/Navigator?Kolb-List">http://www.matronics.com/Navigator?Kolb-List
>>> href="http://forums.matronics.com">http://forums.matronics.com
>>> href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
>>> *
>>>
>>>
>>>
>>
> *
>
> *
>
>
Message 14
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| Subject: | Re: Handheld radio to external antenna connections? |
At 07:19 PM 7/29/2010, Richard Girard wrote:
>Bob, the 50 ohm spec is supplied by using the right coax cable. Go to your
>local Radio Shack and you may be able to buy a cable ready made and only
>fabricate a ground plane for the antenna.
I know it doesn't help for your antenna, but I bought a cable and a
female-female adapter from Radio Shack to mount the supplied rubber duck
antenna remote from the radio (I24 also). Works just fine.
I made my own headset adapter with the PTT button in the end of the control
stick.
-Dana
--
"Naked" means you ain't got no clothes on; "nekkid" means you ain't got
no clothes on - and are up to somethin'.
Message 15
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| Subject: | Re: Handheld radio to external antenna connections? |
On 7/29/2010 1:46 PM, Bob Kravis wrote:
> Hi,
> I followed the suggestions I found in the archives and purchased an
> ICOM-A24 and a Stainless Steel VHS Antenna - 45 degree. The radio
> will mount via its belt clip into a custom bracket between the forward
> edge of the seat and the floor plate (aluminum diamond plate) in my
> Firefly. The antenna will be mounted through the floor plate and
> extend below and back through the belly fabric. That's the plan.
> There were no instructions sent from Aircraft Spruce (part #11-04517)
> and the support tech was not very helpful in how to wire it up. The
> ICOM support guy said most of the antennae come with a coax cable and
> BNC female that you just pug in to the radio. Mine doesn't. Now the
> antenna has a knurled aluminum shouldered spacer, through the center
> of which, the SS antenna rod runs. There are nuts at each end which
> squeeze the assembly together. There is no provision for electrical
> connection. I will have to fabricate a cable with a BNC connector.
> 1. What is the correct cable connection? Does the insulated center
> wire go to the antenna rod end and the sheath go to the aluminum floor
> plate or what? It does not appear that the antenna rod is
> electrically isolated from the mounting hole in the floor plate so I
> don't see how that would work? Google searches for antenna connections
> have not been fruitful.
> 2. I have the adapter for the handheld and will be installing a small
> panel with audio and mic jacks. There is some very expensive cabling
> available to wire this up but what is really needed to get a clean,
> ignition noise free signal?
> Thanks for your input.
> Bob
> E008BK at 9NC8
Hi Bob,
Before you actually hook anything up (you don't want to let the smoke
out), I'd suggest prowling around the aeroelectric web site, & maybe
signing up for the mailing list (also on the Matronics server).
The primary site is at
http://aeroelectric.com/
and you can search for antenna info within the site by just typing
'antenna; into the search box. Here's a link to some of the articles & pics:
http://www.aeroelectric.com/Pictures/Antenna/
It's hard to tell from the tiny pic on the spruce site; does the fat end
of the antenna have a threaded stud instead of an actual connector? If
so, you might want to re-think using it if you don't have reasonably
well developed electronic fabrication & soldering skills. FWIW, you can
make a decent comm antenna from a basic Radio Shack CB antenna &
adapter. See:
http://www.aeroelectric.com/Pictures/Antenna/DIY_Comm_Antenna.jpg
All you have to do to make a CB antenna into a VHF a/c comm antenna is
cut it to around 21" long. Perfect tuning requires instruments, but
perfect tuning isn't required to make it work.
The Icom should already have a BNC female mounted on the radio for the
'rubber ducky', right? If you do something like the link above, all
you'd need is a standard 50ohm (important!) BNC male to BNC male cable
to hook them up. BTW, you can't measure that 50 ohms with an ohm meter.
There are resistance ohms and then there are impedance ohms (that vary
with frequency). The number for the cable is the latter.
Last (or at least the last thing my fingers can type at the moment), the
type of antenna you're contemplating needs a 'ground plane' to work
efficiently and present the correct 'load' (impedance) to the transmit
amplifier. That can be something as simple as 3 or 4 metal straps, tied
to the cable's shield, radiating out at right angles from the base of
the antenna. (The coax cable doesn't actually provide the load; it's
just supposed to have the correct transmission line impedance to get the
signal to the antenna.)
If you sign up for the aeroelectric list, address your question to 'Bob'
(the guy who started the list), & ask for the instructions to use a
cheap CB antenna for comm. The info is all on the web site, but finding
your way around the site is challenging (at least for me).
If this isn't making sense, email me off-list with your phone # or ask
for mine & I'll try to explain in more detail.
Charlie
Message 16
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| Subject: | Re: Handheld radio to external antenna connections? |
Bob, I installed the exact antenna in my Pietenpol and it worked great!
Get the correct coax cable (I don't remember the number but I bought the one
I needed from Radio Shack). The center wire of the coax goes to the Knurled
knob (it's not aluminum) and the sheath of the coax goes to the aluminum
plate as a ground (make sure you clean the aluminum plate to get a good
ground). Try it, you'll like it.
Gene
Firestar KXP N71RB
--------------------------------------------------
From: "Charlie England" <ceengland@bellsouth.net>
Sent: Thursday, July 29, 2010 7:49 PM
Subject: Re: Kolb-List: Handheld radio to external antenna connections?
>
> On 7/29/2010 1:46 PM, Bob Kravis wrote:
>> Hi,
>> I followed the suggestions I found in the archives and purchased an
>> ICOM-A24 and a Stainless Steel VHS Antenna - 45 degree. The radio will
>> mount via its belt clip into a custom bracket between the forward edge of
>> the seat and the floor plate (aluminum diamond plate) in my Firefly. The
>> antenna will be mounted through the floor plate and extend below and back
>> through the belly fabric. That's the plan. There were no instructions
>> sent from Aircraft Spruce (part #11-04517) and the support tech was not
>> very helpful in how to wire it up. The ICOM support guy said most of the
>> antennae come with a coax cable and BNC female that you just pug in to
>> the radio. Mine doesn't. Now the antenna has a knurled aluminum
>> shouldered spacer, through the center of which, the SS antenna rod runs.
>> There are nuts at each end which squeeze the assembly together. There is
>> no provision for electrical connection. I will have to fabricate a cable
>> with a BNC connector.
>> 1. What is the correct cable connection? Does the insulated center wire
>> go to the antenna rod end and the sheath go to the aluminum floor plate
>> or what? It does not appear that the antenna rod is electrically
>> isolated from the mounting hole in the floor plate so I don't see how
>> that would work? Google searches for antenna connections have not been
>> fruitful.
>> 2. I have the adapter for the handheld and will be installing a small
>> panel with audio and mic jacks. There is some very expensive cabling
>> available to wire this up but what is really needed to get a clean,
>> ignition noise free signal?
>> Thanks for your input.
>> Bob
>> E008BK at 9NC8
> Hi Bob,
>
> Before you actually hook anything up (you don't want to let the smoke
> out), I'd suggest prowling around the aeroelectric web site, & maybe
> signing up for the mailing list (also on the Matronics server).
> The primary site is at
> http://aeroelectric.com/
>
> and you can search for antenna info within the site by just typing
> 'antenna; into the search box. Here's a link to some of the articles &
> pics:
> http://www.aeroelectric.com/Pictures/Antenna/
>
> It's hard to tell from the tiny pic on the spruce site; does the fat end
> of the antenna have a threaded stud instead of an actual connector? If so,
> you might want to re-think using it if you don't have reasonably well
> developed electronic fabrication & soldering skills. FWIW, you can make a
> decent comm antenna from a basic Radio Shack CB antenna & adapter. See:
> http://www.aeroelectric.com/Pictures/Antenna/DIY_Comm_Antenna.jpg
> All you have to do to make a CB antenna into a VHF a/c comm antenna is cut
> it to around 21" long. Perfect tuning requires instruments, but perfect
> tuning isn't required to make it work.
>
> The Icom should already have a BNC female mounted on the radio for the
> 'rubber ducky', right? If you do something like the link above, all you'd
> need is a standard 50ohm (important!) BNC male to BNC male cable to hook
> them up. BTW, you can't measure that 50 ohms with an ohm meter. There are
> resistance ohms and then there are impedance ohms (that vary with
> frequency). The number for the cable is the latter.
>
> Last (or at least the last thing my fingers can type at the moment), the
> type of antenna you're contemplating needs a 'ground plane' to work
> efficiently and present the correct 'load' (impedance) to the transmit
> amplifier. That can be something as simple as 3 or 4 metal straps, tied to
> the cable's shield, radiating out at right angles from the base of the
> antenna. (The coax cable doesn't actually provide the load; it's just
> supposed to have the correct transmission line impedance to get the signal
> to the antenna.)
>
> If you sign up for the aeroelectric list, address your question to 'Bob'
> (the guy who started the list), & ask for the instructions to use a cheap
> CB antenna for comm. The info is all on the web site, but finding your way
> around the site is challenging (at least for me).
>
> If this isn't making sense, email me off-list with your phone # or ask for
> mine & I'll try to explain in more detail.
>
> Charlie
>
>
>
Message 17
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|
| Subject: | Re: Handheld radio to external antenna connections? |
I do not see any reason why the airframe cannot be the ground plane? Herb
At 08:41 PM 7/29/2010, you wrote:
><zharvey@bentoncountycable.net>
>
>Bob, I installed the exact antenna in my Pietenpol and it worked
>great! Get the correct coax cable (I don't remember the number but I
>bought the one I needed from Radio Shack). The center wire of the
>coax goes to the Knurled knob (it's not aluminum) and the sheath of
>the coax goes to the aluminum plate as a ground (make sure you clean
>the aluminum plate to get a good ground). Try it, you'll like it.
>Gene
>Firestar KXP N71RB
>
>--------------------------------------------------
>From: "Charlie England" <ceengland@bellsouth.net>
>Sent: Thursday, July 29, 2010 7:49 PM
>To: <kolb-list@matronics.com>
>Subject: Re: Kolb-List: Handheld radio to external antenna connections?
>
>>
>>On 7/29/2010 1:46 PM, Bob Kravis wrote:
>>>Hi,
>>>I followed the suggestions I found in the archives and purchased
>>>an ICOM-A24 and a Stainless Steel VHS Antenna - 45 degree. The
>>>radio will mount via its belt clip into a custom bracket between
>>>the forward edge of the seat and the floor plate (aluminum diamond
>>>plate) in my Firefly. The antenna will be mounted through the
>>>floor plate and extend below and back through the belly
>>>fabric. That's the plan. There were no instructions sent from
>>>Aircraft Spruce (part #11-04517) and the support tech was not very
>>>helpful in how to wire it up. The ICOM support guy said most of
>>>the antennae come with a coax cable and BNC female that you just
>>>pug in to the radio. Mine doesn't. Now the antenna has a knurled
>>>aluminum shouldered spacer, through the center of which, the SS
>>>antenna rod runs. There are nuts at each end which squeeze the
>>>assembly together. There is no provision for electrical
>>>connection. I will have to fabricate a cable with a BNC connector.
>>>1. What is the correct cable connection? Does the insulated center
>>>wire go to the antenna rod end and the sheath go to the aluminum
>>>floor plate or what? It does not appear that the antenna rod is
>>>electrically isolated from the mounting hole in the floor plate so
>>>I don't see how that would work? Google searches for antenna
>>>connections have not been fruitful.
>>>2. I have the adapter for the handheld and will be installing a
>>>small panel with audio and mic jacks. There is some very
>>>expensive cabling available to wire this up but what is really
>>>needed to get a clean, ignition noise free signal?
>>>Thanks for your input.
>>>Bob
>>>E008BK at 9NC8
>>Hi Bob,
>>
>>Before you actually hook anything up (you don't want to let the
>>smoke out), I'd suggest prowling around the aeroelectric web site,
>>& maybe signing up for the mailing list (also on the Matronics server).
>>The primary site is at
>>http://aeroelectric.com/
>>
>>and you can search for antenna info within the site by just typing
>>'antenna; into the search box. Here's a link to some of the articles & pics:
>>http://www.aeroelectric.com/Pictures/Antenna/
>>
>>It's hard to tell from the tiny pic on the spruce site; does the
>>fat end of the antenna have a threaded stud instead of an actual
>>connector? If so, you might want to re-think using it if you don't
>>have reasonably well developed electronic fabrication & soldering
>>skills. FWIW, you can make a decent comm antenna from a basic Radio
>>Shack CB antenna & adapter. See:
>>http://www.aeroelectric.com/Pictures/Antenna/DIY_Comm_Antenna.jpg
>>All you have to do to make a CB antenna into a VHF a/c comm antenna
>>is cut it to around 21" long. Perfect tuning requires instruments,
>>but perfect tuning isn't required to make it work.
>>
>>The Icom should already have a BNC female mounted on the radio for
>>the 'rubber ducky', right? If you do something like the link above,
>>all you'd need is a standard 50ohm (important!) BNC male to BNC
>>male cable to hook them up. BTW, you can't measure that 50 ohms
>>with an ohm meter. There are resistance ohms and then there are
>>impedance ohms (that vary with frequency). The number for the cable
>>is the latter.
>>
>>Last (or at least the last thing my fingers can type at the
>>moment), the type of antenna you're contemplating needs a 'ground
>>plane' to work efficiently and present the correct 'load'
>>(impedance) to the transmit amplifier. That can be something as
>>simple as 3 or 4 metal straps, tied to the cable's shield,
>>radiating out at right angles from the base of the antenna. (The
>>coax cable doesn't actually provide the load; it's just supposed to
>>have the correct transmission line impedance to get the signal to the antenna.)
>>
>>If you sign up for the aeroelectric list, address your question to
>>'Bob' (the guy who started the list), & ask for the instructions to
>>use a cheap CB antenna for comm. The info is all on the web site,
>>but finding your way around the site is challenging (at least for me).
>>
>>If this isn't making sense, email me off-list with your phone # or
>>ask for mine & I'll try to explain in more detail.
>>
>>Charlie
>>
>>
>>
>
>
Message 18
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| Subject: | Re: Handheld radio to external antenna connections? |
On 7/29/2010 9:00 PM, Herb wrote:
>
> I do not see any reason why the airframe cannot be the ground plane?
> Herb
>
>
> At 08:41 PM 7/29/2010, you wrote:
>> <zharvey@bentoncountycable.net>
>>
>> Bob, I installed the exact antenna in my Pietenpol and it worked
>> great! Get the correct coax cable (I don't remember the number but I
>> bought the one I needed from Radio Shack). The center wire of the
>> coax goes to the Knurled knob (it's not aluminum) and the sheath of
>> the coax goes to the aluminum plate as a ground (make sure you clean
>> the aluminum plate to get a good ground). Try it, you'll like it.
>> Gene
>> Firestar KXP N71RB
>>
>> --------------------------------------------------
>> From: "Charlie England" <ceengland@bellsouth.net>
>> Sent: Thursday, July 29, 2010 7:49 PM
>> To: <kolb-list@matronics.com>
>> Subject: Re: Kolb-List: Handheld radio to external antenna connections?
>>
>>> <ceengland@bellsouth.net>
>>>
>>> On 7/29/2010 1:46 PM, Bob Kravis wrote:
>>>> Hi,
>>>> I followed the suggestions I found in the archives and purchased an
>>>> ICOM-A24 and a Stainless Steel VHS Antenna - 45 degree. The radio
>>>> will mount via its belt clip into a custom bracket between the
>>>> forward edge of the seat and the floor plate (aluminum diamond
>>>> plate) in my Firefly. The antenna will be mounted through the
>>>> floor plate and extend below and back through the belly fabric.
>>>> That's the plan. There were no instructions sent from Aircraft
>>>> Spruce (part #11-04517) and the support tech was not very helpful
>>>> in how to wire it up. The ICOM support guy said most of the
>>>> antennae come with a coax cable and BNC female that you just pug in
>>>> to the radio. Mine doesn't. Now the antenna has a knurled
>>>> aluminum shouldered spacer, through the center of which, the SS
>>>> antenna rod runs. There are nuts at each end which squeeze the
>>>> assembly together. There is no provision for electrical
>>>> connection. I will have to fabricate a cable with a BNC connector.
>>>> 1. What is the correct cable connection? Does the insulated center
>>>> wire go to the antenna rod end and the sheath go to the aluminum
>>>> floor plate or what? It does not appear that the antenna rod is
>>>> electrically isolated from the mounting hole in the floor plate so
>>>> I don't see how that would work? Google searches for antenna
>>>> connections have not been fruitful.
>>>> 2. I have the adapter for the handheld and will be installing a
>>>> small panel with audio and mic jacks. There is some very expensive
>>>> cabling available to wire this up but what is really needed to get
>>>> a clean, ignition noise free signal?
>>>> Thanks for your input.
>>>> Bob
>>>> E008BK at 9NC8
>>> Hi Bob,
>>>
>>> Before you actually hook anything up (you don't want to let the
>>> smoke out), I'd suggest prowling around the aeroelectric web site, &
>>> maybe signing up for the mailing list (also on the Matronics server).
>>> The primary site is at
>>> http://aeroelectric.com/
>>>
>>> and you can search for antenna info within the site by just typing
>>> 'antenna; into the search box. Here's a link to some of the articles
>>> & pics:
>>> http://www.aeroelectric.com/Pictures/Antenna/
>>>
>>> It's hard to tell from the tiny pic on the spruce site; does the fat
>>> end of the antenna have a threaded stud instead of an actual
>>> connector? If so, you might want to re-think using it if you don't
>>> have reasonably well developed electronic fabrication & soldering
>>> skills. FWIW, you can make a decent comm antenna from a basic Radio
>>> Shack CB antenna & adapter. See:
>>> http://www.aeroelectric.com/Pictures/Antenna/DIY_Comm_Antenna.jpg
>>> All you have to do to make a CB antenna into a VHF a/c comm antenna
>>> is cut it to around 21" long. Perfect tuning requires instruments,
>>> but perfect tuning isn't required to make it work.
>>>
>>> The Icom should already have a BNC female mounted on the radio for
>>> the 'rubber ducky', right? If you do something like the link above,
>>> all you'd need is a standard 50ohm (important!) BNC male to BNC male
>>> cable to hook them up. BTW, you can't measure that 50 ohms with an
>>> ohm meter. There are resistance ohms and then there are impedance
>>> ohms (that vary with frequency). The number for the cable is the
>>> latter.
>>>
>>> Last (or at least the last thing my fingers can type at the moment),
>>> the type of antenna you're contemplating needs a 'ground plane' to
>>> work efficiently and present the correct 'load' (impedance) to the
>>> transmit amplifier. That can be something as simple as 3 or 4 metal
>>> straps, tied to the cable's shield, radiating out at right angles
>>> from the base of the antenna. (The coax cable doesn't actually
>>> provide the load; it's just supposed to have the correct
>>> transmission line impedance to get the signal to the antenna.)
>>>
>>> If you sign up for the aeroelectric list, address your question to
>>> 'Bob' (the guy who started the list), & ask for the instructions to
>>> use a cheap CB antenna for comm. The info is all on the web site,
>>> but finding your way around the site is challenging (at least for me).
>>>
>>> If this isn't making sense, email me off-list with your phone # or
>>> ask for mine & I'll try to explain in more detail.
>>>
>>> Charlie
>>>
Isn't inconsistent top/bottom posting fun?
"I do not see any reason why the airframe cannot be the ground plane?"
It can, if it's 'dense' enough; an aluminum skin works fine. A typical
tube&fabric airframe is so open it's almost invisible to VHF frequencies.
Having said that, the antenna will work with no ground plane at all;
just not as well. Like the rubber ducky that came on the radio, which
actually has internal 'stuff' to compensate for the lack of a ground
plane and the fact that it's too short. None of the 1/4 wave antennas
that we are discussing have any of that 'stuff' built in. Each is
effectively just a piece of heavy wire.
Charlie
Message 19
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| Subject: | Re: Grounded - 912UL Voltage Problem |
John H,
Since you were wondering, new regulator is "just" $170.95. Just ordered one.
Thanks to all for the help.
--------
Thanks too much,
John Bickham
Mark III-C w/ 912UL
St. Francisville, LA
I know many pilots and a few true aviators. There is a distinct difference that
I have the greatest respect for.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=306770#306770
Message 20
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| Subject: | Re: Handheld radio to external antenna connections? |
The name of the game is to cut the old msg(s), leaving only enough info so
the reader will know where you are coming from.
Most folks don't do that, for some unexplained reason.
john h - Firm believer in keeping it simple.
mkIII
> Isn't inconsistent top/bottom posting fun?
>
>
> Charlie
Message 21
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I have to sell my Factory Built Kolb Kolbra. It has an 80 HP Jabiru 2200
with 2 blade warp drive prop. 6 hrs on airframe and 30 hrs on engine. BRS
VLS 1050, Intercom, EIS, Vertical card compass, and N-numbered ready to Fly.
$28,500.00 I also have an enclosed trailer used to haul it available. Let
me know if you're interested or have any questions.
Thanks,
Shad Pennington
5500 Sierra Hills Road
Amarillo, TX 79124
806-383-4309
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