[ARC5] [Milsurplus] Carbon mic pops

[DSP3]

Apropos of I'm not sure what, I recently "cured" this problem with my 
ARC-25 setup.  The two ARR-15 receivers were quiet during key down and 
key up, no issues whatever. However, the R-23 Q-5er exhibited a keying 
transient that would ring your ears.  Muting for that receiver (and the 
two ARR-15s) was a triple pole relay.  The B+ for the R-23 was 
controlled, in this case.  I shorted the B+ keying and the horrendous 
click remained.  I brought out the screen voltage, thinking this might 
calm things down but no joy, whatever!  What I had to do was lift the RF 
gain pot from ground as the muting feature.  Presto, the click was 
gone.  Now... that did noting to address the source of the original 
click, unless HV switching of the B+ in these radios is an issue?.  
Perhaps I've simply  masked the effect.  Its curious that neither of the 
ARR-15 receivers have any issues, at all.  Just the R-23.  I use a 
home-brew supply for the ART-13 and that, I /think/, may be the root 
source for the click.  That said, an identical supply on the adjacent 
ARC-8 setup has no such issues?  I will have to hang a scope on the R-23 
audio leads and see what, exactly is the issue.  But, as they say in the 
"islands"   "Mon, it be no big ting"........ So... I simply be happy.....

Jeep - K3HVG



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20161130/5d314754/attachment.html>