A blast from the past, it's been 17 years since I was involved with this
stuff.
In E1 PCM multi channel voice transmission systems the standard test
tone was 1024Hz so as not to interact with the 8kHz sampling rate.
This is not a fault but a fact of life.
Maybe the designers would care to mention the DSP sampling rate for the
TX audio.
Regards,
Mike VP8NO
On 04/08/2017 15:46, Richard Lamont wrote:
> On 04/08/17 19:33, Brian Hunt wrote:
>> Here's some followup:
>> FLDIGI shows the "pumping" affect with carrier tones of 500, 1000, 1500,
>> and 2000 Hz.
>> WSJT-X 1.8 shows the "pumping" affect with carrier tones of 1000, 1500
>> and 2000 Hz (couldn't select 500 Hz).
>>
>> The affect is very narrow with frequency. 10 Hz either way and the
>> output and ALC display and MON output is rock solid. Changing the K3
>> filter center frequency has no effect on the above.
>
> This looks like a beat between the modulating frequency and some
> sampling process associated with the ALC meter.
>
> 73,
> Richard G4DYA
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
