Today's Message Index:
----------------------
1. 05:13 AM - Re: Z-13 power distribution: main bus lowervoltage (Brian Lloyd)
2. 05:21 AM - Re: Z-13 power distribution: main bus lowervoltage (Trampas)
3. 05:52 AM - Re: PS Engineering pin contacts needed (CardinalNSB@aol.com)
4. 06:31 AM - Re: Please Remove (Dale Martin)
5. 06:36 AM - Re: Odd Transmission (Mdharfst@cs.com)
6. 06:43 AM - Re: Z-13 power distribution: main bus lowervoltage (Brian Lloyd)
7. 06:46 AM - Re: Re: PS Engineering pin contacts needed (Jeff Orear)
8. 07:05 AM - Re: Alternator Control Z-14 (Robert L. Nuckolls, III)
9. 07:48 AM - Re: Re: Odd Transmission 0.5 MIME_BASE64_LATIN (Brian Lloyd)
10. 08:18 AM - Re: Z-13 power distribution: main bus lower (Treff, Arthur)
11. 08:33 AM - Comm receiver overload (Robert L. Nuckolls, III)
12. 11:41 AM - Re: Please Remove (qcbccgalley)
13. 06:55 PM - Re: Feedback for Bob - Roll your own crowbar module (Ralph Ketter)
14. 07:37 PM - KT-71 Transponder (James J. Varney)
15. 08:37 PM - ICOM A200 and Flightcom 403 - Transmit Problems? (John Wiegenstein)
Message 1
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| Subject: | Re: Z-13 power distribution: main bus lowervoltage |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Robert L. Nuckolls, III wrote:
> If he's getting 1.1 volts of drop across this arrangement,
> I'm wondering about the "diodes" in the part. This is too
> much drop.
That was what I thought too. I tried several silicon power bridge rectifier modules
and found them all to be in that range. That is why I switched to Schottky
diodes. I am not the least bit sorry I did and will not use silicon rectifiers
in this application any more. Even the marine and RV community is abandoning
silicon rectifiers in favor of Schottky rectifiers for the battery isolation
application.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 2
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| Subject: | Z-13 power distribution: main bus lowervoltage |
--> AeroElectric-List message posted by: "Trampas" <tstern@nc.rr.com>
Brain,
I noticed in a previous post that there was some debate about using Schottky
diodes as opposed to silicone. I have been racking my brain trying to figure
out what the argument would be about?
Regards,
Trampas
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Brian
Lloyd
Subject: Re: AeroElectric-List: Z-13 power distribution: main bus
lowervoltage
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Robert L. Nuckolls, III wrote:
> If he's getting 1.1 volts of drop across this arrangement,
> I'm wondering about the "diodes" in the part. This is too
> much drop.
That was what I thought too. I tried several silicon power bridge rectifier
modules and found them all to be in that range. That is why I switched to
Schottky diodes. I am not the least bit sorry I did and will not use
silicon rectifiers in this application any more. Even the marine and RV
community is abandoning silicon rectifiers in favor of Schottky rectifiers
for the battery isolation application.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 3
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| Subject: | Re: PS Engineering pin contacts needed |
--> AeroElectric-List message posted by: CardinalNSB@aol.com
Hello, I need the following for a PS Engineering 7000 audio panel:
Plastic connector "shells" that holds the metal contact pins and the metal
contact pins (are these generic, or manufacturer only), if manufacturer only I
can call PSE, if generic I would appreciate a part number and a good place to
order from
Also, what insertion and extraction tool and crimper is appropriate for these
contacts.
Thank you, Skip Simpson
Message 4
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| Subject: | Re: Please Remove |
--> AeroElectric-List message posted by: "Dale Martin" <niceez@cableone.net>
Matt,
Please remove me from ALL lists concerning aeroelectric-list.
Thank You
Dale Martin
Lewiston, ID
niceez@cableone.net
----- Original Message -----
From: "Matt Dralle" <dralle@matronics.com>
Subject: AeroElectric-List: Official Usage Guideline [Please Read] [Monthly
Posting]
> --> AeroElectric-List message posted by: Matt Dralle
<dralle@matronics.com>
>
> Dear Lister,
>
> Please read over the AeroElectric-List Usage Guidelines below. The
complete
> AeroElectric-List FAQ including these Usage Guidelines can be found at the
> following URL:
>
> http://www.matronics.com/FAQs/AeroElectric-List.FAQ.html
>
> Thank you,
>
> Matt Dralle
> Matronics Email List Administrator
>
>
****************************************************************************
**
> AeroElectric-List Usage Guidelines
>
****************************************************************************
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> The following details the official Usage Guidelines for the
AeroElectric-List.
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therein.
> Failure to use the AeroElectric-List in the manner described below may
result
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>
> AeroElectric-List Policy Statement
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for
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Message 5
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| Subject: | RE: Odd Transmission |
0.5 MIME_BASE64_LATIN RAW: Latin alphabet text using base64 encoding
1.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding
--> AeroElectric-List message posted by: Mdharfst@cs.com
posted by: "William Yamokoski"
I have a question concerning an intermittent problem I experience. ...a few days
ago I was at 2500' making a position report while flying near a
small airport. After my transmission, one pilot said he could not understand
my report, the transmission was too garbeled and gravelly. Two other pilots
immediately chimed in and said they heard me fine. .... I have a MicroAir
760, with a copper strip dipole antenna bonded to the inner surface of the vertical
stabilizer of my GlaStar. Could it be positional? .... Any ideas on
this?
Bill Yamokoski, N4970Y
Bill
I have a Glastar with a bonded antenna in the vert fin and a Microair 760. I have
had this experience once, two months ago at Sunriver, Oregon. Five miles
out and in the pattern the FBO radio was garbled, all other aircraft within range
(in the pattern and up to 50 miles or more) were perfectly intelligible.
On the ground the FBO still sounded like an old, cheap, school intercom system,
very loud and very garbled. This was right to the point of being 90% unintelligible.
I talked to the FBO operator about it and he said I was not garbled
and when he checked with other aircraft HE was reported as perfectly clear.
When I left I checked again and the FBO was still garbled on the ramp and in the
pattern. All other transmissions that day were clear and ever since then too.
It was not positional. I thought it might be the mountainous area Sunriver
is in but other area towers and unicoms were clear. The only other guess was
that I might have had the radio turned up too loud for a base station that
close. I'll be going back this summer and checking it out but I haven't lost
any sleep over it. I'm not happy to hear this could be worse. If it gets worse
I'll try another antenna.
Michael Harfst N9TZ
Message 6
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| Subject: | Re: Z-13 power distribution: main bus lowervoltage |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Trampas wrote:
> --> AeroElectric-List message posted by: "Trampas" <tstern@nc.rr.com>
>
> Brain,
Thanks but actually my name is Brian. ;-)
> I noticed in a previous post that there was some debate about using Schottky
> diodes as opposed to silicone. I have been racking my brain trying to figure
> out what the argument would be about?
People frequently make the mistake of writing "silicone" when they mean "silicon".
Just remember that silicone is for breast augmentation. I think about "silly
cones" and therefore have no trouble remembering which is which. :-)
Here are the issues. The physics of standard silicon diodes gives them a forward
voltage drop starting at about 0.7 VDC but it can be higher. The physics of
the Schottky diode (which is also made of of silicon but made in a different
way) is less. As a result it dissipates less power and your essential buss receives
a higher voltage, much closer to the VR setpoint or to the main battery
voltage than with a silicon power rectifier such as in the large bridge rectifier
modules that Bob favors.
The silicon power rectifier can withstand a higher reverse voltage than can the
Schottky power rectifier but that is not an issue in this application as it is
not being called upon to rectify AC to DC.
Schottky power rectifiers are more expensive than an equivalent silicon power rectifier
but the proliferation of low-voltage computer technology and switching
power supplies have driven the market to require large quantities of Schottky
power rectifiers which has driven the price down to where there is almost no
obvious price advantage for silicon power rectifiers.
To be honest with you, this is more of an argument akin to "how many angels can
dance on the head of a pin." It doesn't matter that much unless you have a poorly-designed
piece of equipment that quits working at a higher voltage than
is reasonable. I have seen some radios that will not work at 10V. A lead-acid
battery is "dead" when it gets to somewhere between 10.5V and 11V. If you have
a Schottky diode your equipment might still be working when the battery is
almost dead and might not if you choose to use a silicon power rectifier.
But if you are dependent on your radio still working at that point, you probably
have worse problems.
But I am a purist. The Schottky diode is technically a better solution so that
is what I prefer. But the advantage is pretty small and probably not worth arguing
about.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 7
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| Subject: | Re: PS Engineering pin contacts needed |
--> AeroElectric-List message posted by: "Jeff Orear" <jorear@new.rr.com>
Hi Skip:
Go to www.steinair.com and you will find what you need. Stein has the
plastic shells of which you speak as well as an extraction tool ( you just
shove the pins in to insert them). I *think* he has the crimp tool for the
pins. If not B&C will have them.
Regards,
Jeff Orear
RV6A N782P (reserved)
Peshtigo, WI
----- Original Message -----
From: <CardinalNSB@aol.com>
Subject: AeroElectric-List: Re: PS Engineering pin contacts needed
> --> AeroElectric-List message posted by: CardinalNSB@aol.com
>
> Hello, I need the following for a PS Engineering 7000 audio panel:
>
> Plastic connector "shells" that holds the metal contact pins and the metal
> contact pins (are these generic, or manufacturer only), if manufacturer
only I
> can call PSE, if generic I would appreciate a part number and a good place
to
> order from
>
> Also, what insertion and extraction tool and crimper is appropriate for
these
> contacts.
>
> Thank you, Skip Simpson
>
>
Message 8
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| Subject: | Re: Alternator Control Z-14 |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 10:32 PM 6/1/2004 -0400, you wrote:
>--> AeroElectric-List message posted by: "Richard Sipp" <rsipp@earthlink.net>
>
>Bob:
>
>Z-12 (single battery - dual alternator) depicts an alternator control switch
>for the aux alternator. The primary alternator however appears to be
>controlled by the battery master switch without an independent field
>control. Is there an operational logic for this configuration?
the recommended switch for the main alternator is an S700-2-10
progressive transfer device. Wired as shown, you get three positions:
OFF - BAT - BAT+ALT
This mimics the functionality of the infamous split-rocker master
switch in a much less expensive device that looks like it goes
with the rest of the ship's switches.
Figure Z-12 is not recommended for new design. It's shown as a
reasonable way to ADD an aux alternator to an existing system
such as one might find in a certified ship. If you have a vacuum pump
pad open, Figure Z-13 is less expensive and lighter. It provides
dual alternator reliability that's adequate for probably 95% of
the airplanes being built in peoples basements and garages. If your
endurance loads dictate a need for more capacity in the aux alternator
then perhaps Z-14 is more appropriate. Have you done a load analysis
to size your alternators?
>I am planning the Z-12 configuratin for an RV-10 which has the battery
>mounted aft of the passenger compartment. I know the ideal battery ground
>is common to the firewall penetration - engine ground - ground bus
>connection. With the all metal airframe would you still recommend a rather
>long fat wire ground connector to the firewall or a local battery ground to
>the airframe at the aft battery location?
If it were my airplane, I'd run the battery (-) to the firewall
ground stud. However, hundreds of thousands of certified ships
have used airframe grounds for battery (-) connections. Give it
a try. If you don't have any noteworthy noise problems,
then it was a reasonable decision.
Bob . . .
-----------------------------------------
( Experience and common sense cannot be )
( replaced with policy and procedures. )
( R. L. Nuckolls III )
-----------------------------------------
Message 9
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RAW": Latin.alphabet.text.using.base64.encoding.1.0.MIME_BASE64_TEXT.RAW:Message.text.disguised.using.base64.encoding@matronics.com
| Subject: | Re: RE: Odd Transmission 0.5 MIME_BASE64_LATIN |
RAW: Latin alphabet text using base64 encoding 1.0 MIME_BASE64_TEXT
RAW: Message text disguised using base64 encoding
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Mdharfst@cs.com wrote:
> --> AeroElectric-List message posted by: Mdharfst@cs.com
>
> posted by: "William Yamokoski" I have a question concerning an
> intermittent problem I experience. ...a few days ago I was at 2500'
> making a position report while flying near a small airport. After
> my transmission, one pilot said he could not understand my report,
> the transmission was too garbeled and gravelly. Two other pilots
> immediately chimed in and said they heard me fine. .... I have a
> MicroAir 760, with a copper strip dipole antenna bonded to the inner
> surface of the vertical stabilizer of my GlaStar. Could it be
> positional? .... Any ideas on this? Bill Yamokoski, N4970Y
>
> Bill I have a Glastar with a bonded antenna in the vert fin and a
> Microair 760. I have had this experience once,
I have experienced this problem with the Microair 760. Seems that when the signal
is too strong, the receiver overloads and produces unusable audio. We ran
into the problem with aircraft flying formation. The radio works fine when the
aircraft are a 1/2 mile apart or so but becomes unsable after the join up.
Since it didn't affect all Microair radios I suspect they have a mod or upgrade
to solve the problem. Check with the manufacturer.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
Message 10
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| Subject: | Re: Z-13 power distribution: main bus lower |
--> AeroElectric-List message posted by: "Treff, Arthur" <Arthur.Treff@smartm.com>
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<bob.nuckolls@cox.net>
voltage
See http://www.aeroelectric.com/Pictures/s401-25.jpg for details on
wiring a bridge-rectifier as an e-bus normal feed diode.
Bob . . .
Bob,
Thanks, the photo confirms that I have hooked it up the way you suggested.
Any other ideas on the voltage drop?
Art
Message 11
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| Subject: | Comm receiver overload |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 10:44 AM 6/2/2004 -0400, you wrote:
>--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
>
>Mdharfst@cs.com wrote:
> > --> AeroElectric-List message posted by: Mdharfst@cs.com
> >
> > posted by: "William Yamokoski" I have a question concerning an
> > intermittent problem I experience. ...a few days ago I was at 2500'
> > making a position report while flying near a small airport. After
> > my transmission, one pilot said he could not understand my report,
> > the transmission was too garbeled and gravelly. Two other pilots
> > immediately chimed in and said they heard me fine. .... I have a
> > MicroAir 760, with a copper strip dipole antenna bonded to the inner
> > surface of the vertical stabilizer of my GlaStar. Could it be
> > positional? .... Any ideas on this? Bill Yamokoski, N4970Y
> >
> > Bill I have a Glastar with a bonded antenna in the vert fin and a
> > Microair 760. I have had this experience once,
>
>I have experienced this problem with the Microair 760. Seems that when
>the signal is too strong, the receiver overloads and produces unusable
>audio. We ran into the problem with aircraft flying formation. The radio
>works fine when the aircraft are a 1/2 mile apart or so but becomes
>unsable after the join up. Since it didn't affect all Microair radios I
>suspect they have a mod or upgrade to solve the problem. Check with the
>manufacturer.
If the problem was resistance to receiver overload, then
there's nothing you can do to your radio to make the problem
go away for the situation you cited. The difficultly lies
with the receiver in the airplane that couldn't hear you
well. If you get ANY reports of good intelligibility from
other airplanes, then the fact that one or more individuals
can't hear you well is not your problem.
Now, if YOU have problems hearing closely positioned aircraft
on YOUR receiver . . . and the problem goes away when distance
between you increases, then there MIGHT be something that can
be done to help your receiver.
I've built attenuators for temporary installation in the antenna
line for airplanes that were going to spend a lot of time flying
in formation. For them most part, this is a transient condition
that shouldn't be much cause for concern. In the case you've
cited, there is nothing you should be expected to do to alleviate
and overload problem in the other airplane's receiver.
Bob . . .
Message 12
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| Subject: | Re: Please Remove |
--> AeroElectric-List message posted by: "qcbccgalley" <cgalley@qcbc.org>
At the bottom of every aeroElectric-list message is ...
UN/SUBSCRIBE: http://www.matronics.com/subscription
Try clicking on and following instructions, You were able to do it to get
on; NOw do it to get off!
----- Original Message -----
From: "Dale Martin" <niceez@cableone.net>
Subject: Re: AeroElectric-List: Please Remove
> --> AeroElectric-List message posted by: "Dale Martin"
<niceez@cableone.net>
>
> Matt,
>
> Please remove me from ALL lists concerning aeroelectric-list.
>
> Thank You
>
> Dale Martin
> Lewiston, ID
> niceez@cableone.net
>
> ----- Original Message -----
> From: "Matt Dralle" <dralle@matronics.com>
> To: <aeroelectric-list@matronics.com>
> Subject: AeroElectric-List: Official Usage Guideline [Please Read]
[Monthly
> Posting]
>
>
> > --> AeroElectric-List message posted by: Matt Dralle
> <dralle@matronics.com>
> >
> > Dear Lister,
> >
> > Please read over the AeroElectric-List Usage Guidelines below. The
> complete
> > AeroElectric-List FAQ including these Usage Guidelines can be found at
the
> > following URL:
> >
> > http://www.matronics.com/FAQs/AeroElectric-List.FAQ.html
> >
> > Thank you,
> >
> > Matt Dralle
> > Matronics Email List Administrator
> >
> >
>
****************************************************************************
> **
> > AeroElectric-List Usage Guidelines
> >
>
****************************************************************************
> **
> >
> > The following details the official Usage Guidelines for the
> AeroElectric-List.
> > You are encouraged to read it carefully, and to abide by the rules
> therein.
> > Failure to use the AeroElectric-List in the manner described below may
> result
> > in the removal of the subscribers from the List.
> >
> >
> > AeroElectric-List Policy Statement
> >
> > The purpose of the AeroElectric-List is to provide a forum of discussion
> for
> > things related to this particular discussion group. The List's goals
> > are to serve as an information resource to its members; to deliver
> > high-quality content; to provide moral support; to foster camaraderie
> > among its members; and to support safe operation. Reaching these goals
> > requires the participation and cooperation of each and every member of
> > the List. To this end, the following guidelines have been established:
> >
> >
> > - Please keep all posts related to the List at some level. Do not
submit
> > posts concerning computer viruses, urban legends, random humor, long
> > lost buddies' phone numbers, etc. etc.
> >
> > - THINK carefully before you write. Ask yourself if your post will be
> > relevant to everyone. If you have to wonder about that, DON'T send
it.
> >
> > - Remember that your post will be included for posterity in an archive
> > that is growing in size at an extraordinary rate. Try to be concise
> and
> > terse in your posts. Avoid overly wordy and lengthy posts and
> > responses.
> >
> > - Keep your signature brief. Please include your name, email address,
> > aircraft type/tail number, and geographic location. A short line
> > about where you are in the building process is also nice. Avoid
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Message 13
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| Subject: | Re: Feedback for Bob - Roll your own crowbar module |
--> AeroElectric-List message posted by: Ralph Ketter <arizonahikers@juno.com>
Bob,
Now that your back maybe you can take a look at the readings I took for
troubleshooting my OV crowbar module.
Thanks,
Ralph
************************
On Mon, 3 May 2004 15:03:21 -0500 Ralph Ketter <arizonahikers@juno.com>
writes:
Original posting 4/12/04
>>
>>I build my own OV crowbar module and it functions correctly except that
>>it operated in the 10-11 volt range. I triple checked the components
and
>>wiring. I tested the 1N4742A diode and it regulates at 12V. I changed
>>the 1.62K ohm resistor specified for a 14 volt system to 6.04K and the
>>circuit operates in the correct voltage range of 15.5-17 volts. Has
>>anyone else found this?
***************************
> With the 1.62K resistor in place, adjust the potentiometer to
> approximately mid range. Adjust the power supply to a point just
> below the trip point and then measure voltage at (1) + end of
> capacitor and (2) junction of zener diode and the 392 ohm
> resistor and tell us what you get.
>
> Bob . . .
>
> -----------------------------------------
> ( Experience and common sense cannot be )
> ( replaced with policy and procedures. )
> ( R. L. Nuckolls III )
> -----------------------------------------
Thanks for the reply Bob,
Sorry I took so long with a response to your suggestion.
I did as you suggested. The pot is set to mid range for all of the
following voltage readings.
Designating Point (1) as the + end of the capacitor, and Point (2) as the
junction of the 392 ohm resistor, and GND as the negative lead, I got the
following readings:
1.62 K resistor in place for 14 volt operation. - Trip point = 10.4
volts.
Point (1) - Point (2) +0.436 volts
GND - Point (2) +7.6 volts
6.04K resistor replacing the 1.62K one. - Trip point = 16.22 volts.
Point (1) - Point (2) +0.538 volts
GND - Point (2) +7.36 volts
These readings made me realize the circuit was not letting the zener
regulate at 12 volts so I did the following checks.
First I disconnected the SCR trigger lead to prevent it from firing.
I reinstalled the original 1.62K resistor.
Measuring the Zener voltage from GND to Point (2):
As I increased the input voltage the voltage across the zener increases
linearly to about 8.25 volts and then starts to decrease. The input
voltage is about 9 volts when this knee occurs.
I then disconnected the 1N4148 diode and repeated the above test with
basically the same results.
With the 1N4148 diode still disconnected, I also disconnected the NPN
collector and PNP base (they remained connected together) from the Point
(2) junction. Now only the Zener and 392 ohm resistor are in series
across the supply. Again measuring the Zener voltage from GND to Point
(2):
The zener voltage tracks the input voltage up to about 11.3 volts at
which point the zener begins to regulate.
With the two transistors still disconnected, I reconnected the 1N4148
diode.
Now the voltage across the zener increases linearly up to 9 volts (input
voltage is 9.35) when suddenly the voltage drops to 1.87 volts.
When I made the statement in my original email that the zener regulates
at 12 volts, I neglected to say that I tested it out of the circuit.
Ralph Ketter
RV-6
Marysville, KS
***************************
Message 14
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| Subject: | KT-71 Transponder |
--> AeroElectric-List message posted by: "James J. Varney" <jvarney@vfpi.com>
Hey all.
I picked up a KT-71 transponder with no rack/connector. From what I can
figure out from info available, this transponder will fit in the rack
and connector for the KT-76a so I found one and bought it. I looked at
the connector pin-out diagrams on Bob's site and the KT-71 is not
listed. Does anybody happen to know if the KT-76a pin-outs are the same?
or, does anybody happen to have the correct wiring diagram for this
setup? It will be connected to an ACK-A30 Encoder.
I thank you in advance.
James Varney
RV-7a Fuse
Message 15
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| Subject: | ICOM A200 and Flightcom 403 - Transmit Problems? |
--> AeroElectric-List message posted by: "John Wiegenstein" <n727jw@hellerwiegenstein.com>
I've got an RV-6 (almost done) with an ICOM A200 comm radio, Flightcom 403
intercom, and the Van's wiring harness for the Flightcom. I've wired it all
up per the Van's drawing and the ICOM schematic. Functional test has
checked out OK for passenger and pilot headsets (receive), intercom
functions, etc., and I can receive comm transmissions just fine. Problem
is I don't seem to be able to transmit. When I use the PTT switch the ICOM
shows "TX" on the display, but I don't hear myself in the headphones when I
talk, and cannot get a response from tower. I tried placing multimeter
leads across the antenna terminal (its a generic belly mount bent whip) and
to ground, and when the PTT is pressed and "TX" shows on the ICOM, I show a
jump to about 1.5V across the antenna. Checking continuity of wiring, etc.
all seems to be OK. Any ideas? I'd be happy to call on my nickel and talk
with anyone who has this setup, or similar, or who might have dealt with a
similar problem. TIA
John Wiegenstein
Hansville, WA
RV-6 N727JW
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