TX spikes caused by VAC?

USB headsets to digital audio workstation software...
G3NPI
Posts: 26
Joined: Wed Apr 12, 2017 3:23 pm

TX spikes caused by VAC?

Postby G3NPI » Wed May 16, 2018 4:10 pm

I am seeing random spikes when transmitting. They are visible on RX2 and are visible by other stations who are receiving me at about S9+10dB. They are radiating +/- 20 kHz from my frequency. By ticking "Limit Stitched Receivers" the spike occurance is much reduced. If I turn off VAC (actually Vince Burrell's VAC) the spikes do not occur. Unfortunately this is not a fix I want to use as during contests I use the VAC to interconnect with N1MM+.
It occurs running a watt into a dummy load, so I have discounted RF feedback.
I wonder if anybody has a work around for this problem?

ANAN 10 running HPSDR mRX PS v3.4.9

W10 with latest update on I7 machine.

73

Geoff G3NPI
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w-u-2-o
Posts: 1004
Joined: Fri Mar 10, 2017 1:47 pm

Re: TX spikes caused by VAC?

Postby w-u-2-o » Wed May 16, 2018 11:12 pm

HI Geoff,

Did you follow the guidelines in this post:

https://apache-labs.com/community/viewtopic.php?f=13&t=2655

:?:

73,

Scott

P.S. moved this thread to the VAC sub-forum.
G3NPI
Posts: 26
Joined: Wed Apr 12, 2017 3:23 pm

Re: TX spikes caused by VAC?

Postby G3NPI » Thu May 17, 2018 7:53 am

Thanks Scott. Looks like I did not use the right search criteria !!
Away for a few days but have put it on my desk top to study on return.

73

Geoff G3NPI

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