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com Antenna

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peterc(at)pipcom.com
Guest

Posted: Fri Aug 14, 2009 8:29 am Post subject: com Antenna

Would one of you knowledgeable guys give some comments on this?



Would an ACK ELT 17.5" whip with the 18 turn coiled part near the end work

as a com antenna?



I also have a used Cessna 598501-0104 streamline base 23" antenna that I

can use. Do you know if it actually is a com antenna and when I install it

are the 4 mounting bolts enough to connect it to the ground plane or does

the whole base have to make contact?



Would appreciate any feedback

thanks

Peter

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Sun Aug 16, 2009 2:47 pm Post subject: Re: com Antenna

The ELT antenna might work but is unlikely to meet the installation standards for VSWR. Thin radiator with loading coils and no base impedance match is a hard task to get right. The ELT only had to work at 121 / 243 MHz. For Com you need 118-136 Mhz and dont want response at 243 MHz, that should be suppressed.



Cant be specific about the Cessna antenna unless you know the manufacturer part no. such as Dorne-Margolin (DM.....)  most of these are very suitable antennas and fit with a cork gasket to the fuselage AND a doubler plate where the 4 nuts mount the antenna so they have a good grounding via the mount plate. 



Ralph

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_________________
Ralph - CH701 / 2200a

peterc(at)pipcom.com
Guest

Posted: Mon Aug 17, 2009 2:57 am Post subject: com antenna

Thanks Ralph, I'll try the Cessna one.

Peter

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Wed Aug 19, 2009 12:50 pm Post subject: com Antenna

I recommend putting a ground braid on one of the nuts you would use to

attach the Cessna antenna to the airplane.  That antenna should give you

better service than the ELT antenna which is designed to operate best at one

frequency only.  The Cessna antenna should also be a bit faster on the

outside of your plane.



Noel



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_________________
Noel Loveys
Kitfox III-A
Aerocet 1100 Floats

peterc(at)pipcom.com
Guest

Posted: Thu Aug 20, 2009 6:12 pm Post subject: com antenna

OK Noel, I'll do that when I try that antenna.



Because the ELT antenna was already mounted, I took the easy way and tried

it with the com.

The frequencies I used were 119.3 to 123.0 and the reception was as good

as I've ever had with any radio (it is a KY-97). Transmission was just

fine too.



Will still try the other antenna.



The tray and board for the 97 looks exactly like an Icom I have. Are they

in fact equivelent pin outs?



Thanks again.

Peter

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