[hpsdr] TX drop outs generating transients

[Tom Cathey]

Interesting.   Does the drop-out seem dependent on modulation or will it
drop out if you just leave the carrier on for a few minutes with no
modulation?
 
Technically, there's no  "over-modulation" of the negative peaks when using
a balanced modulator to generate DSB with carrier, since the carrier is
never fully cut off, as with a conventional plate or collector modulated
system.  
 
But, if the drop outs  are audio-related, maybe the higher positive audio
peaks are triggering something else that requires more CPU overhead?
 
 
I will run some tests too and see what happens here.
 
Tom, K1JJ


  _____  

From: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of FRANCIS CARCIA
Sent: Sunday, February 06, 2011 5:11 PM
To: hpsdr at lists.openhpsdr.org
Subject: [hpsdr] TX drop outs generating transients



http://www.youtube.com/watch?v=gsSok0y4h7A
 
My friend Rob W1AEX just recorded his screen shot of my HPSDR on AM during
drop outs. Notice the transient generated down frequency. This was after I
disabled windows Indexing and removed some server software from my machine.
Dell 650 dual- dual core 
running at 5-7% horsepower. I'm running 1.2 Firmware in Penny. Also get drop
outs in RX from time to time. Rob is about 20 miles away. I was running 20
watts AM. I wonder if this 
could be due to over modulation. I need to do some more testing but it does
also happen on RX. I suppose you would never notice this on SSB unless there
was constant audio. Frank WA1GFZ
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