Hi Paul,

There is a latency (delay) between what you
say into the microphone (or what you send
on CW) and what goes out on the air.  Most
reports of echo turn out to be RFI.  The
transmitted signal is picked up by the
microphone input slightly behind your speech
and is an echo of what you just said.
I'm guessing that higher gain in DX or
Compander is revealing the RF pickup.

If you have a second receiver, try transmitting
into a dummy load and listen on the second
receiver.  Then compare with transmitting
on your antenna.


Mike - AA8K



Paul Giusti wrote:
> Hi All
> 
>  
> 
>                 I seem to be experiencing on transmit what sounds like an
> "echo" its sounds like a delay i.e. a few milliseconds at first i thought it
> was RF getting in..but on air reports say its an echo.
> 
>  
> 
>                 I have tried on current Test SVN as well as K6JCA consoles
> and both have the same effect..it seems to appear only when compander or DX
> setting is uded.
> 
>  
> 
>                 Its a late model SDR1000 (Jan 07 Build) using a FA66 and a
> Heil HM-10 Dual Insert microphone. The microphone is plugged into input 1 on
> the FA66. I use sample rate of 192khz.
> 
>  
> 
>                 Any advice would be greatly appreciated in finding the cure
> of the "echo"
> 
>  
> 
>                 Thanks
> 
>  
> 
>                 Paul - VK3APG
> 

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