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Re: formation flight comm attenuator

 
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nuckollsr(at)cox.net
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PostPosted: Wed Jan 04, 2006 2:16 pm    Post subject: Re: formation flight comm attenuator Reply with quote


At 10:24 AM 1/3/2006 -0500, you wrote:
Howdy all-
After another frustrating couple of occasions trying to communicate with
fellow formators I MUST come up with some solution to this problem. Recap-
whenever closer than 300' (MOL) to other planes, transmissions from other
planes are
typically very garbled & unreadable on my Microair 760. They can hear me
fine & radio works excellent at greater distances. Several listers here have
suggested BNC attenuators to resolve this, but most I've found are limited to
less than the output power of the 760 (about 5watts). See:
http://www.smelectronics.us/bnc,fattenuators.htm
A representative for JFW Industries claims to have a 50 ohm/5 watt unit at a
reasonable price ($45) that he claims will do what I need. Unfortunately, it
seems installing one of these "should" mitigate the formation problem, but
longer-range comm will suffer. I asked about a "switchable" unit. The
rep said
it's possible, but much pricier (custom job).

You don't need a 5W unit unless you plan to run your transmitter
continuously. Like starter motors that are expected to produce
several hp for seconds at a time, an attenuator for a vhf comm
transmitter can be rated for a relatively small fraction of the
transmitter's output power. Just don't try to read War and Peace
to others in the formation . . . make them get their own entertainment
systems.
I didn't have time to do a comic book on this project but did
get some pictures made and a rough assembly document. See:
http://www.aeroelectric.com/articles/Attenuator
The "dummy load" portion of this design is good for 2W continuous
and should be fine for transmitters up to 6W or so. Just don't make
long winded transmissions.
I took a peek at this assembly on the super kilodollar network
analyzer and it's entirely adequate to the task and presents a
barely detectable "lump" in the transmission line in the
NORMAL mode and SWR of 1.4:1 or better over comm range.
Bob . . .

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sportav8r(at)aol.com
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PostPosted: Wed Jan 04, 2006 6:39 pm    Post subject: Re: formation flight comm attenuator Reply with quote


Bob, this looks like it will do nicely. You're a packaging genius! I'll be rolling one of these soon.


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brian-yak(at)lloyd.com
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PostPosted: Wed Jan 04, 2006 7:24 pm    Post subject: Re: formation flight comm attenuator Reply with quote


sportav8r(at)aol.com wrote:


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