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zeprep251(at)aol.com
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 Posted: Sun Aug 12, 2012 4:52 pm Post subject: Icom External Antenna |
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Thanks,
I'll give it a try.
G.A.
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Mon Aug 13, 2012 7:35 am Post subject: Icom External Antenna |
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I stand corrected. I guess it's a matter of what the
ignition is designed for. It IS a problem on some 2-strokes,
though.
-Dana
Dana/Kolbers:
I ran Bosch platinum resistor plugs in my 447. Worked much
better than the NGK standard plug. I also used Bosch spark
plug wires and resistor metal caps. Used to buy a set of
wires for a 1976 Volvo. That would give me two complete
wire sets. Had to do that so the caps would fit the plug
shape.
john h
mkIII
Del Norte, Colorado
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Mon Aug 13, 2012 7:38 am Post subject: Icom External Antenna |
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Isn't that the same as attaching it across the positive
terminal of the key ignition and negative battery terminal
(or ground)? So that the cap is across the battery positive
and negative terminals, but only when the master is on?
Phil/Kolbers:
I mount mine directly behind the reg/rec on the 12VDC side.
john h
mkIII
Del Norte, Colorado
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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byoungplumbing(at)gmail.c
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| Posted: Wed Aug 15, 2012 7:05 am Post subject: Icom External Antenna |
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Gary Aman wrote "This is actually covered in a March post from Boyd Young, but I need some more particulars if you don't mind.Looks like RG58, but what lengths do I start with before tuning with the SWR meter Boyd?
Thanx G.Aman "
Gary Aman and the group
Gary had posted this picture of my antenna attached 'boyd-antenna.jpg'
I got to the airport yesterday and what I measured was, the center conductor seemed as best as I could measure "21 1/2 inches" the braid should be just as long but I would have had to remove all the floor panels to measure it.
attached are some more pictures of the installation.
'Braid-location.jpg' shows the coax which is RG58 with bnc connector,,, as it goes to the left front of the nose cone. ( the length of the coax is not critical, long enough to reach without kinks and pulls but the shorter the better, the length of the center conductor and braid is critical. with the center conductor length being most critical) also it shows the braid of the coax angling back to under the floor panels. (I had to try different angles to get the best swr.
'antenna-center.jpg' shows the center conductor going up vertical along the left side of the nose cone. and the braid doubling back through the fabric.
antennaleft.jpg shows the mid section of the antenna center conductor vertical up the left side and across the top.
'antennaend.jpg' shows the antenna going across the top of the nosecone. the antenna end in the photo coming from the right side is my elt antenna, and the black long rubber duck in the front is my ham radio tracker. with the tracker running, my wife can check my progress on long trips so she does not have to worry. and if the track stops in the middle of nowhere, she knows where to send the search.
you can see I mounted the center conductor as well as the braid in short sections of drinking straw siliconed to the inside of the nose cone. sections of duct tape were used in the trials. but with time would fall off.
the 21 1/2 inches is the finished measurement + or - my measuring skills while standing on my head, over under around and through the rudders peddles and nose cone. I started with 25 inches and cut to length and changed position of both the center conductor and braid, while using an antenna analyzer that our ham radio club owns. it is not the perfect location and I am sure I could improve radio coverage with an external antenna and a better ground plane. but it works well enough for my needs.
boyd young
kolb mkiii n1225y
ham radio extra n7wfm
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zeprep251(at)aol.com
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| Posted: Wed Aug 15, 2012 2:00 pm Post subject: Icom External Antenna |
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Thanks Boyd,
That's pretty much the way I installed it.So far I have'nt found a SWR to tune it with,but it did.not interfere with flying because i just switch the coax at the radio,a quick change from one antenna to the other.
Thanks for all the pics.I appreciate all your efforts. G.Aman, P S Marj says say hi to Becky!
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