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"Broken and Garbled" (Additional data)

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nuckollsr(at)cox.net
Guest

Posted: Mon Jan 01, 2007 11:36 am Post subject: "Broken and Garbled" (Additional data)

At 09:55 AM 12/27/2006 -0800, you wrote:



 	  Quote: 	
		  I have had poor reception from towered airports with my XCOM and now that 

my radio is out for repair, poorly received transmissions with my ICOM 

handheld A5. I've even tried hooking up my aircraft Comant antenna to the 

ICOM but it didn't improve how others hear me (or don't). Could I need 

some filter or something? This seriously limits my entry into controlled 

airspace so any fix ideas are appreciated.

Ron - RV-4

<mailto:N8ZD(at)yahoo.com>N8ZD(at)yahoo.com


	


   Ron,



   Sorry to take so long to get to this . . . the past 10 days

   has been wall-to-wall family gatherings so I've been somewhat

   pre-occupied.



   You need to conduct some tests that do not involve ATC

   controllers and other pilots-at-large. My experience has been

   that these folks are least able to articulate their perceptions

   of radio quality.



   Get another hand held and find an avionics technician

   or ham radio operator (the grayer the hair the better) and

   do some experiments on some frequency not in local usage.

   Your cohort in the experiments should be a significant

   distance from your airplane . . . 1/4 to 1/2 mile would be

   good.



   Craft a series of experiments where one thing at a time is

   swapped between two conditions. Your experimental cohort

   should be able to identify and articulate the differences

   between signals that are distorted due to overload and those

   that are intermittent. He should be able to identify the

   differences between audio that is clipped and audio that

   is generally polluted at all levels. He'll also be able to

   differentiate between the desired signal (your voice)

   and extraneous signals that are products of distorted voice

   or other noises.



   By process of elimination, you should be able to deduce

   which piece of hardware is the focus of the problem and

   ultimately deduce and fix its shortcomings. But short of

   acquiring and applying some expensive and cumbersome test

   equipment, access to an experienced and trained "test ear"

   is your fastest path to success.



   If I were trying to single-handedly resolve your issues in my

   own airplane, I would consider using a pair of low-cost GMRS walkie-

   talkies and modifying them to craft a remote receiver for

   testing the airplane's transmitters. You could attach headphones

   to one walkie-talkie. You might want to power the other

   one from larger external batteries. Tape the ptt button down

   on the one with fat batteries and rubber-band it to the front

   of the VHF hand held so that the antennas point opposite

   directions. Set the paired radios up to receive your ship's

   transmitter and repeat what is received back to you via the

   UHF GMRS hand-helds. It will take a little fiddling with

   volume controls but you should be able produce an accurate

   real-time sample of your transmitted signal as a remotely sensed

   "side tone" in the headphones.



   This would let you conduct the experiments in the airplane

   and make your own deductions as to cause-and-effect.



   Bob . . .



      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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rparigor(at)SUFFOLK.LIB.N
Guest

Posted: Mon Jan 01, 2007 12:48 pm Post subject: "Broken and Garbled" (Additional data)

"I would consider using a pair of low-cost GMRS walkie-

 	  Quote: 	
		      talkies and modifying them to craft a remote receiver for

    testing the airplane's transmitters."


	


Hmmm



Free nights and weekend cell/wired/phone/s?



Ron Parigoris

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