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Radio Noise

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oscardog

Joined: 01 Sep 2007
Posts: 15

Posted: Sun Nov 18, 2007 10:51 am Post subject: Radio Noise

  

[b][b]I have a  problem of reported  background noise and a weak transmission when I ask for a radio check  which just started about 3 weeks ago. Prior to that checks were loud and  clear.[/b] 

[b]My engine is a Rotax 912ULS and I am  sure it's engine noise that I am getting.[/b]

  

[b]My reception is fine on all channels  I have tried. When I transmit, the red light on the Microair 760 Radio sort  of blinks in time to a beep - beep in the headset. As I increase RPM on the 912  the beeps increase until they are almost a solid tone at around 5000  RPM.[/b]<?xml:namespace prefix = o ns =  "urn:schemas-microsoft-com:office:office" />

  

[b]I am stumped so any suggestions to  solve this you have are  welcomed.[/b]

[/b]

   [quote][b]

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nuckolls.bob(at)cox.net
Guest

Posted: Sun Nov 18, 2007 8:34 pm Post subject: Radio Noise

At 10:47 AM 11/18/2007 -0800, you wrote:



I have a  problem of reported background noise and a weak transmission when 

I ask for a radio check which just started about 3 weeks ago. Prior to that 

checks were loud and clear.



My engine is a Rotax 912ULS and I am sure it's engine noise that I am getting.



My reception is fine on all channels I have tried. When I transmit, the red 

light on the Microair 760 Radio sort of blinks in time to a beep - beep in 

the headset. As I increase RPM on the 912 the beeps increase until they are 

almost a solid tone at around 5000 RPM.



I am stumped so any suggestions to solve this you have are welcomed.



   You need to investigate quality of your

   power on the electrical system. With a

   good battery in place and a properly

   functioning alternator/regulator-rectifier,

   there should be no way for the engine's

   rpm to reflect upon your transmitter's

   operation.



   Check your alternator's output voltage under

   full and light loads . . . make sure it's

   stable. Put a known good "test" battery in

   parallel with the ship's battery, or temporarily

   replace the ships battery to see if it makes

   a difference.



   Bob . . .

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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jon(at)finleyweb.net
Guest

Posted: Mon Nov 19, 2007 8:29 am Post subject: Radio Noise

If the 912 uses resistor spark plug wires, you might try replacing them. Resistor wires are known to degrade over time.

  

 I know nothing about the 912 so please disregard my comments if not applicable...

  

 Jon

DO NOT ARCHIVE



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