[hpsdr] Ozy/Janus/SDR-1000 high freq audio white noise..

[Mike Naruta]

Yep, David - KM5TZ and I have also observed
it Al.

I wonder if that's related to the problem
that I asked about earlier.  I get that
noise with Janus in transmit.  It's NOT
RFI; I am into a dummy load, turn the Output
down to ZERO and I still see 4 WATTS Forward
on the PowerSDR with the Mic gain at ZERO
and nothing plugged into the Mic connector.
In CW there is the same 4 Watts Forward
with the key UP.  My monitor scope, Bird
watt meter, and external receiver all verify
that there is noise all the time in transmit.
Four watts of RF with no drive is not trivial.

Please give yours a try in transmit Al to
see if you can duplicate it.


Mike - AA8K

"[hpsdr] Atlas Ozy Janus noise in transmit"

"[hpsdr] Janus noise problem?"



Al wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> I don't know if anyone else has noticed this problem but... If I have 
> the RF gain set in the range of 50-80 then I can here a low level of 
> high frequency white (?) noise that is independent of the IF bandwidth.. 
> I do not have this effect with the D44 sound card. Tuning the RF gain 
> down further reduces the noise to zero.  Turning the gain up masks the 
> white noise with IF noise. 
> 
> AL, K0VM

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