[Lowfer] WOLF!

[Bill de Carle]

At 06:32 PM 1/1/2016, John, W1TAG wrote:
>Bill,
>
>Thanks for the report. Not sure what sampling rate you were using 
>with the netbook -- perhaps it doesn't support 8000 Hz. Maybe try 
>11025? I don't think that the WOLF GUI was designed to go above that.

Well, guess one is never too old to learn something new, eh?

I was using 8000 samples per second.  I have three of those SYBA 
dongles (they use the VIA ENVY VT1620A sound chip and are excellent 
in all other respects).  All of them are *extremely* close to the 
nominal sample rate at 48000, 24000, 12000 (e.g. WSPR works perfectly 
without any correction).  I naively assumed 8000 would be bang on as 
well.  But then I injected a known audio tone at 8000 s/s rate and 
measured the apparent frequency and whaddya know, the *actual* sample 
rate was 7800.00223 s/s !!!  I was flabbergasted.  Typed in that 
sample rate and WOLF now decodes correctly.

Dunno if it's the VT1620A chip or the Microsoft driver.  You'd think 
it would be easy to divide 48000 by 6 to get 8000.
73,
Bill VE2IQ