AF volume loss when using SPLIT

Helmut Wurzer

Hello FLEX users!
For years and different FLEX-6K I've been wondering about a clearly noticeable AF loss in SPLIT mode, which I tried to compensate more or less well by different AF settings of VFO-A and VFO-B. In the end I almost came to terms with it and attributed it to my age-related hearing loss (although I didn't have this shortcoming with other TRXes, such as IC-7600, etc.)...
...and over all these years I never read/found anything about this "effect" here in the FLEX-Forum - so it really seemed to concern only me...  :-)
But now I noticed more or less by chance how drastic the hearing difference really is! Only with VFO-A the signal is clear and loud audible (according to the settings!) - but as soon as you activate VFO-B via SPLIT, it gets much quieter! But how bad it really is, you can see when you listen to the same signal with VFO-B (VFO-A is muted!), the same signal is even quieter and above all much more dull and frequency-cut...
If you do the same listening test not by SPLIT activation but by switching on a 2nd pan adapter (which is now VFO-B), this signal is loud and clear on both VFO's and the loss effect described above does not occur, instead you can record different signals on both VFO's - CW pileups are now not only a pleasure for the eyes but also for the ears!   :-)

Conclusion: I think this is a real bug of the FLEX-6K series (I don't know if it's hard- or software) and should be fixed!
But to make this a topic for FLEX as well, several other FLEX operators would have to confirm this bug and/or report their experiences...

Helmut, OE8TTR

Duane_AC5AA

I have noticed the exact same thing on my 6600 & Maestro running 2.16 (but was there in earlier versions too.)

Lasse Moell

This is a known defect....
https://community.flexradio.com/flexradio/topics/audio-equalizer-on-rx-b-slice
I bet you are using the RX equalizer. To get the audio properly working on slice B, make sure you are selecting this slice, and bring out the mode selection for slice B. Change from what ever mode you are using to any other mode i.e. CW to USB and then back to CW. Presto the audio is properly working.

It's been reported long ago, but not sure how high this is on the "to-do" list. At least there is a work-around.

Helmut Wurzer

Hi Lasse, thanks for the link with a work-around - tried it and worked!
And yes you won the bet...  :-)
This bug exists for sure since SSDR V1 (using nw V3) - the "to-do" list must be long...  ;-)
73's Hel