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SmartSDR v3.7.4 and the SmartSDR v3.7.4 Release Notes | SmartSDR v2.12.1 and the SmartSDR v2.12.1 Release Notes
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Power Genius XL Utility v3.8.8 and the Power Genius XL Release Notes v3.8.8
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6400 no SSB TX Audio - Solved
Joe N9VX
Member ✭✭
I setup my new 6400 yesterday and could not get any SSB TX audio out. After spending 30 - 40 minutes looking for the problem, I found DEXP was on by default and set at a high level, it was not allowing any audio to pass. So I turned it off and have SSB TX audio now.
Just thought I would post this and possible save someone else some time.
Just thought I would post this and possible save someone else some time.
2
Comments
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What is DEXP?
Just got my 6400 today - haven't transmitted yet. Receive is spectacular...
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http://www.arrl.org/files/file/QEX_Next_Issue/2014/Nov-Dec_2014/Hershberger_QEX_11_14.pdf
DEXP - Downward Expander - aka CE-SSB. The magic is done in the DSP (?) and yields about 2dB more 'talk power'.
I've had mine at 50% w/o the aforementioned problem...
Congrats on the new radio!
k3Tim
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It is my understanding that DEXP (Downward Expander) is a form of noise gate that shuts down back ground noise (fan and etc) while transmitting on SSB . On Apache Lab SDR radios you have both DEXP and CESSB, so I think they are two separate functions.0
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SmartSDR has DEXP and CESSB too. They are separate audio processing functions that do different things.0
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Gents, just put my 6400 online and no SSB TX Audio via the handheld mic .. turned DEXP on and off and nothing .. all suggestions welcome ... do I have a bum brand new mic .. unlikely .. all help welcomed .. love the full duplex CW .. need to get SSB going now .. Thanks Ed W2MKM
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Hi Ed
Did you make sure you have the right Mic input? You didn't say what you had looked at yet.
Have a look at the SmartSDR Software Users Guide starting on Page 62 where it discusses Mic profiles, etc.
http://www.flexradio.com/downloads/smartsdr-software-user-guide-pdf/
Mike
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Ed,
If you are using the M version radio, in my opinion Flex's method to choose microphone inputs is not very clear and the manual does not do a very good job explaining it.
The microphone selection on the left needs to be highlighted. In the picture below I am running balanced line input.
To me this looks more like a menu to setup various inputs. But the audio input will not work unless you leave it on the proper input on the left.
In other words, if I setup my balance line input the way I want and then click the MIC on left, my balanced line wont work because MIC is actually selected.
Rich
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This might help. I grabbed the description from the Maestro Manual as I had it handy.
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Mike/Rich,
Thanks for the replies ... much appreciated ...
Mike, yes I've been through the Mic profiles section a couple of times and while not intuitive ... I think I'm getting it .. though I do appreciate the link to the V2.0.17 of the SmartSDR SW Users Guide .. I was down rev.
I have triple checked that I have connected the Flex FHM-2 Hand Mic that ships with the 6400 to the correct PTT (RCA) Port (PTT works) and 1/8 mic port in the back of the radio (still suspecting a bum mic .. but that's too easy a hypothesis)
Rich, I'm running just the 6400 (non M version) so not seeing exactly the same screen that you included ..
Here's mine .. still no joy ...
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I think I read the factory mic is a condenser mic and needs the mic bias turned on in the setup. I would think the Flex profile would turn that on but you might want to check
Rich
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BINGO ... Thanks Rich .. silly me to not have known that the Flex supplied FHM-2 handheld mic was a condenser and that the Bias has to be enabled ... a quick Ctrl-F on Bias and your comment got me there ...
From the SmartSDR window main menu bar - Settings>Radio Setup>Phone CW Tab> Microphone Box - click on Bias ... and you/I am in business ..
Love the puzzle .... others may not so much ..
Thanks guys
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That's great Ed. Glad its working.
I would think this would be considered a small bug as the FHM-2 profile should turn on BIAS. This is something that is retained in MIC profiles.
Rich
0
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