Today's Message Index:
----------------------
1. 12:57 PM - Re: Kolb-List Digest: 7 Msgs - 08/11/12 (George Bearden)
2. 01:01 PM - Re: Kolb-List Digest: 7 Msgs - 08/11/12 (George Bearden)
3. 02:41 PM - rf swr meters (b young)
4. 04:10 PM - clasic or extra for sale$$ (Malcolm Brubaker)
5. 10:21 PM - Re: rf swr meters (Duane Ransdell)
Message 1
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Subject: | RE: Kolb-List Digest: 7 Msgs - 08/11/12 |
> I wondered if I could use the same SWR meter
I am not an expert, but after looking at the way the SWR meter works I would
think it isn't sensitive to frequency, and that it should work. Worth a try
anyway.
GeoB
Message 2
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Subject: | RE: Kolb-List Digest: 7 Msgs - 08/11/12 |
> A large "capacitor" about 21,000 mf always worked
Large is always good. I don't know diddly about the 912 but on other similar
problems I have found a handful of small caps liberally sprinkled about the
system works well too.
A thing that just flashed on me... what if you disconnected the electronics
from the airplane electrical system in order to determine how much of the
problem comes from the power supply. Maybe you could temporarily power stuff
from a small battery, as a test. This might help you focus your attention if
the problem is in the power being supplied.
Message 3
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> I wondered if I could use the same SWR meter
I am not an expert, but after looking at the way the SWR meter works I would
think it isn't sensitive to frequency, and that it should work. Worth a try
anyway.
GeoB
>>>>>>>>>>>>>
GO TO
http://www.martinrfsupply.com/
and on the 4th line down on the left are pictures of the bird rf watmeters elements.....
each element is for a different frequency and or power setting.
so in short the answer is swr meters are different for different frequencies...
unless you buy one that has interchangeable elements. or read the meter
specification pages and see if it will work,,, there may be ( I haven't seen
any) some conversion charts in the spec pages that would allow you to figure
the correct readings if you are out of frequency ranges of the meter.
find a ham radio club, and ask for help. probably get help for free... or buy
the correct equipment.
boyd young
kolb mkiii driver and
ham radio operator
Message 4
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Subject: | clasic or extra for sale$$ |
were looking for a 4 stroke kolb xtra or clasic-. cheking -barnstormers
adds all thi time. -have been hopping the rite deal comes along.-- f
eel free to call if anyone has something they would consider selling.--
- mal-- call any time=0A=0A=0AMalcolm & Jeanne Brubaker =0AMichigan S
port Pilot Repair =0Ahttp://michigansportpilotrepair.com/ =0ALSRM-A, PPC,
WS=0AGreat Sails - Sailmaker =0Afor Ultralight & Light Sport=0A(989)513-302
2 =0A- =0A=0A=0A=0A =0A=0A________________________________=0A From: Gary
Aman <zeprep251@aol.com>=0ATo: kolb-list@matronics.com =0ASent: Wednesday,
August 15, 2012 5:58 PM=0ASubject: Re: Kolb-List: Icom External Antenna=0A
=0A=0AThanks Boyd,=0AThat's pretty much the way I installed it.So far I ha
ve'nt found a SWR to tune it with,but it did.not interfere with flying beca
use i just switch the coax at the radio,a quick change from one antenna to
the other.=0AThanks for all the pics.I appreciate all your efforts. G.Aman,
P S - Marj says say hi to Becky!=0A=0A-----Original Message-----=0AFrom:
b young <byoungplumbing@gmail.com>=0ATo: kolb-list <kolb-list@matronics.co
m>=0ASent: Wed, Aug 15, 2012 11:05 am=0ASubject: Re: Kolb-List: Icom Extern
al Antenna=0A=0A=0AGary Aman wrote "This is actually covered in a March pos
t from Boyd Young, but I need some =0Amore particulars if you don't mind.Lo
oks like RG58, but what lengths do I start =0Awith before tuning with the S
WR meter Boyd?=0AThanx G.Aman =0A"=0A=0A =0A- =0AGary Aman and the group
=0A- =0AGary had posted-this picture of my =0Aantenna-- attached-
'boyd-antenna.jpg' =0A=0AI got to the airport yesterday and what I measure
d =0Awas,-- the center conductor seemed as best as I could measure "21
1/2 =0Ainches"- the braid should be just as long but I would have had to
remove =0Aall the floor panels to measure it.- =0A=0Aattached are some m
ore pictures of the =0Ainstallation. =0A=0A'Braid-location.jpg'-- shows
the coax =0Awhich is RG58 with bnc connector,,, as it goes to the left fro
nt of the nose =0Acone.- ( the length of the coax -is not critical,-
long enough to =0Areach without kinks and pulls but the shorter the better,
- the length of =0Athe center conductor and braid is critical. with the c
enter conductor length =0Abeing most critical)---also it =0Ashows the
braid of the coax angling back to under the floor panels.- (I had =0Ato
try different angles to get the best swr. =0A- =0A'antenna-center.jpg'-
shows the center =0Aconductor going up vertical along the left side of the
nose cone. and the braid =0Adoubling back through the fabric. =0A- =0Aan
tennaleft.jpg-- shows the mid section =0Aof the antenna center conducto
r- vertical up the left side and across the =0Atop. =0A- =0A'antennaend
.jpg'- shows the antenna going =0Aacross the top of the nosecone.-- t
he antenna end-in the =0Aphoto-coming from the right side is my elt ant
enna,- and the =0Ablack- long rubber duck in the front is my ham radio
tracker.-- =0Awith the tracker running, my wife can check my progress o
n long trips so she =0Adoes not have to worry.- and if the track stops in
the middle of nowhere, =0Ashe knows where to send the search. =0A- =0Ayo
u can see I mounted the center conductor as well =0Aas the braid in short s
ections of drinking straw siliconed to the inside of the =0Anose cone.- s
ections of duct tape were used in the trials. but with time =0Awould fall o
ff. =0A- =0Athe 21 1/2 inches is the finished =0Ameasurement-- +-or
--- my measuring skills while =0Astanding on my head,- over under ar
ound and through the rudders- =0Apeddles and nose cone.-- I started w
ith 25 inches and cut to =0Alength- and changed position-of both the ce
nter conductor and braid, =0A-while using an antenna analyzer that our ha
m radio club =0Aowns.--- it is not the perfect location and I am sure
I could =0Aimprove radio coverage with an external antenna and a better gr
ound plane.- =0Abut it works well enough for my needs. =0A- =0Aboyd you
ng =0Akolb mkiii-- n1225y =0Aham- radio extra- n7wfm =0A- =0A-
==================
Message 5
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Subject: | Re: rf swr meters |
SWR meters ARE sensitive to frequency. They are designed to only work
inside a specific range of frequencies and no a CB SWR meter will not work.
The CB band is pretty well centered around 27 MHz and aircraft band is
mostly around the 122 range depending what you are using it for.
Boyd is right. Find a amateur radio person in your neighborhood and they
will likely be more than happy to help you out with this little project.
This is what we love to do.
I've built many antennas and there is something beautiful about a well
tuned antenna.
Duane
On Thu, Aug 16, 2012 at 4:35 PM, b young <byoungplumbing@gmail.com> wrote:
>
>
> > I wondered if I could use the same SWR meter
>
> I am not an expert, but after looking at the way the SWR meter works I
> would
> think it isn't sensitive to frequency, and that it should work. Worth a try
> anyway.
>
> GeoB
>
> >>>>>>>>>>>>>
>
> GO TO
>
>
> http://www.martinrfsupply.com/
>
> and on the 4th line down on the left are pictures of the bird rf
> watmeters elements..... each element is for a different frequency and or
> power setting. so in short the answer is swr meters are different for
> different frequencies... unless you buy one that has interchangeable
> elements. or read the meter specification pages and see if it will
> work,,, there may be ( I haven't seen any) some conversion charts in the
> spec pages that would allow you to figure the correct readings if you are
> out of frequency ranges of the meter.
>
> find a ham radio club, and ask for help. probably get help for free...
> or buy the correct equipment.
>
> boyd young
> kolb mkiii driver and
> ham radio operator
>
>
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