>
>Bob,
>
>Fred Hulen here, off the net. I have purchased one of your manuals, so
>maybe you wouldn't mine answering a quick question for me.
My plesure sir . . .
>I am ready to mount a Comant CI-292-2 (BOTTOM MOUNT type, steeply swept
>back Com antenna) on my Zenith 601. I see in the archives that most 601
>builders mount their transponder antenna immediately behind the rear "Z" of
>the center wing section (I must assume you are not familiar with the 601,
>so the rear Z is the last structural member going from left to right at the
>very rear of the center wing section where it attaches to the rear
>fuselage.) Anyway... my questions is this: Due to limitations in ground
>clearance there is a limit as to how far I can mount the Com antenna toward
>the rear away from the transponder antenna, and, in trying to stiffen the
>mounting area for the com antenna near on of the "L" crossmembers, the
>forward base of the com antenna will be about 23" away from the transponder
>antenna. Is this OK? Otherwise I'll have to find a different location for
>the transponder antenna.
The risk for mounting them closer together is that the transponder
transmitter will put little buzzes into the comm receiver every time
it replies to a radar interrogation. I would suggest this:
Go ahead and mount the comm antenna further forward and see how
well it works. If the transponder's interferrence with the comm
receiver is small (meaning tollerable) or non-existant, then you're
off and running. The worst thing that happens is that you have to
find a new, more remote location for the transponder antenna later
which is no worse than you are considering right now.
Bob . . .
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