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Another QMX+ became SSB capable

 

开云体育

Kudos to Hans - the beta was well worth the wait!
Thanks again to the folks that helped me earlier this year locate and replace the bad switch. I had not used the little beast that much after confirming the repair, mostly due to time commitments. Did get some good reports on CW, then shelved it until firmware beta 1-01-003 that covered SSB was dropped.
The firmware upgrade was straight forward. I constructed two Mic adapters, one for a spare ICOM HM-219 and one for a Heil ProSet Elite iC. Both worked well without adjustments of any kind.
First voice QSO was this afternoon on 40M with VA3XV up in Ontario (about 400+ miles). He reported the audio to be as very nice, as good as my 7610. The QMX+ even received a 54 sig report when the QSB and adjacent frequency QRM was not present.
Next up configuring it for fldigi - FSQ and other digital modes... and of course portable ops. So far this has proved an excellent and surprisingly full featured little rig.
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Jack Spitznagel
KD4IZ FM19oo
Parkton, MD
 

Hi Jack,
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Did you go through the calibration cycle or just run with default calibration settings?
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It's just that I can get my QMX+ to do a complete successful calibration run and resulting in distorted audio.
Running the rig with default calibration settings (returned it to factory default settings), I don't get audio distortion, but mic volume is low. Increasing the mic gain then generates undesirable background noise. But that's a desperate challenge is need to resolve...
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Cheers,
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Mel. M0KMD
 

One thing I've noticed is that the Transmit EQ has a default Global Gain of -20.? Setting this to 0 seems to help with the gain.
 

Hi Jack,
I also have a Heil ProSet Elite iC headset. Would you be willing to provide your adapter wiring details?
Thanks
Errick
N9DWD
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Hi Jack
I see your ICOM microphone has 2 buttons on top !
Would that be an option to wire them in to the 2 on front of QMX+ ??
Or not useful.....
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Cheers
Gert
 

Mel,
I just loaded the firmware. No adjustments yet. The voice QSO’s did not think the audio drive to be low with the HM-219 or the headset.
--
Jack
KD4IZ
FM19OO
 

Hi Gert,
No idea! It would be interesting to have freq up/down from the mic but require surgery I don’t want to contemplate.
--
Jack
KD4IZ
FM19OO
 

Errick,
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I will need to draw something up. I used some covered 4 lead salvaged from a non working USB cable. Basically just followed the ICOM 8 pin pinouts for the IC-7300/HM-219 and attached the mic and PTT grounds to the 3,5 mm stereo ground (shaft), the mic+ to the ring, and PTT+ to the tip.
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For the headset, I used a 3,5mm in-line socket for the mic ground (shaft contact) and mic+ to the tip contact. I nipped off the ring contact to get it out of the way and reduce the chance for a short when I reassembled the socket cover. I did some adhesive shrink tubing for cosmetics and extra strain relief. ?I used a 1/4” phone jack for the PTT line so I could use a foot pedal or aircraft strap on PTT switch. Nothing elegant there. The headset phone lead just plugs in to the phone jack on the front panel.
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For the HM-219 microphone, I used an in-line 8pin male connector and just connected the appropriate pins to get the mic and PTT function from the HM-219 to the QMX+ mic/key socket as described in the first paragraph.
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Hope that helps.
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--
Jack
KD4IZ
FM19OO

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