David, I can only suggest that you try before and after settings of your
devices with your favorite latency checker (like
http://www.thesycon.de/eng/latency_check.shtml ) with both PowerSDR and VAC
running. I do not remember where I found the piece which caused the light to
come on for me and resulted in a current 203 uSec absolute maximum DPCs for
my computer when running PowerSDR 2.3.5, DXLab Suite, N1MM, Chrome, Windows
Mail, VAC, etc. The message was that all sound devices needed to be on the
same sampling rate (or even multiple) and that Windows sound devices
includes both inputs, outputs, hardware, and software.
I have my Flex-1500 audio running MME with VAC 1 as input and VAC 2 as
output, buffer 2048, sample 48000, latency 120, RX 0, TX 0. Auto enable is
checked. Direct IQ; OUTPUT TO VAC is NOT checked for PSK-31 or RTTY....
Output to VAC IS checked for CWSkimmer. I do not see or notice a difference
with Stereo checked.
I hope what I provided helps you; I spent a couple years and several hundred
dollars, trying to solve hardware and software driver latency problems which
did not exist.... the problem was the audio sampling rate.
73 & DX,
Gary - AB9M
-----Original Message-----
From: David Land
Sent: Saturday, May 31, 2014 2:08 PM
To: flexradio@flex-radio.biz
Subject: [Flexradio] Sound card settings?
Gary,
Regarding your email below. This is the first time I've notice that this
might be a problem. I knew that all the settings inside PowerSDR should be
the same but didn't know about the external sound card settings! So now I
double checked, in 'setup' I have 'Audio' 'Primary' set to Buffer of 2048
and Sample rate of 96000. In VAC 1 I have the same but 'stereo' is not
clicked. Should it be? I'm running a F3000 so there is no VAC 2.
Then on my sound card of the PC, used to do just the normal PC sounds and
such I have it set to 24 bit 96000 Hz for playback, I also checked the
other set of speakers and the two Line 1 and Line 2 playbacks were all
shown as Virtual Audio Cables. Set them all to 24 bit 96000 Hz. Should I
also have all the 'Recording' inputs set to that? I show 10 items on that
list, mics, lines, and S/PDIF.
Thanks & 73,
Dave KD5FX
__________________________________________
Message: 3
Date: Fri, 30 May 2014 13:53:26 -0500
From: GARY HUBER <glhu...@msn.com>
To: <les...@veenstras.com>, "FlexRadio Reflector"
<FlexRadio@flex-radio.biz>
Subject: Re: [Flexradio] Newbie help needed with 5000A in area of
W.MD/NE <http://w.md/NE> WV
Message-ID: <snt147-ds23100dcf866f8d1464a043a6...@phx.gbl>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Another thing to check / verify; make sure all audio devices are running the
same sampling rate and depth.... i.e 2 channel, 16 bit, 48,000 Hz.
Mismatches with VAC and sound cards WILL cause significant DPCs (Delayed
Procedure Calls).
73 & DX,
Gary - AB9M
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