intermittent lack of output modulation/power

Greg Zenger [N2GZ]

When keying my radio using the PTT via front Mic connector, occasionally (~1 for every 20 attempts) the radio goes into transmit (Red Light, RCA TX1 engages etc) however there is no modulation from the microphone and output power.

I do not observe any problem when keying via CAT.

Flex 6700 SSDR v1.5.1.70

Jim Gilliam

Have you tried it with a different microphone? Maybe the audio path is keyed through the microphone switch. However, I have never seen a microphone that did that.

N4TTY

I was getting that both from PTT and CAT. Reset the radio and now PTT seems OK but no output via CAT. Perplexing!

Ken - NM9P

I had that happen a few times (very few) on my rear panel foot-switch during this weekend's CQWW SSB 2015 contest.  In previous software versions it seemed to happen a lot more frequently. 

I think it also happened about once or twice in 425 contacts so far when using DAX & CAT to key the N1MM+ Voice Keyer. 

It seems to be what I would call, for lack of a better engineering term, either an "interrupt problem" or a "keybounce issue."  The engineers at FRS have been working on it and recent releases have improved the situation, but it still raises its head from time to time.

Ken - NM9P

Greg Zenger [N2GZ]

Ive been experiencing this for about a year... and it certainly has gotten better in recent software releases, but its still there.  Good to hear its being worked on.

Tim - W4TME

This is a known issue, but one that has been very difficult to determine root cause because it is so intermittent.  We think we may have found a contributing issue and that fix will be in the next release of SmartSDR.  Fingers crossed.

Ken - NM9P

If it helps diagnostics  .... I seldom notice this happening unless I have DAX activated.  (though it HAS happens sometimes) 

This weekend it happened several times, and seemed to happen more often the longer I operated.  I was using DAX #4 for the N1MM+ Voice Keyer.

BUT...It happened a LOT less than in some of the previous software releases.
so you guys are zeroing in on it....crossing fingers.

Ken - NM9P
Flex 6500 w/ v.1.5.1 -- i3 computer with Win 10