I have a new uBitx that seems to be working fine except for the microphone. I am using several electret mics that I know work as I use them on my computer, hand held Baofeng, ICOM 746, etc with no issues at all except for the microphone output. In LSB on 40 meter I have no output on LSB or USB. CW works fine as it should with the straight key. I have tried the stock sketch as well as the KD8CEC 1.061 sketch. Both have the same characteristics. When the PTT is depressed, the LCD indicates the unit is going into TX mode, there is lots of speaker pop both on depression and release. However there is no output on my meter. I can go to CW mode and get a full 7 watts out. d
I have checked the wiring about a dozen times and am getting 1.4 vdc on the violet wire which is hooked to the tip of the mic connector and the blue wire is hooked to ground. The mic I am currently trying to use is a Kenwood speaker mic I use on my Baofeng. It works fine.

Suggestions, ideas, comments?




--
72 and God bless
KD4EPG

I would bet that the mic socket is wired incorrectly. Two of the pins disconnect when the plug is inserted.
73
Dave
K0MBT

What voltage are you seeing at the base of Q6 when in transmit?

tim ab00wr

On Sat, 28 Apr 2018 18:31:39 -0700
Kd4epg@... wrote:

I have a new uBitx that seems to be working fine except for the
microphone. I am using several electret mics that I know work as I
use them on my computer, hand held Baofeng, ICOM 746, etc with no
issues at all except for the microphone output. In LSB on 40 meter I
have no output on LSB or USB. CW works fine as it should with the
straight key. I have tried the stock sketch as well as the KD8CEC
1.061 sketch. Both have the same characteristics. When the PTT is
depressed, the LCD indicates the unit is going into TX mode, there is
lots of speaker pop both on depression and release. However there is
no output on my meter. I can go to CW mode and get a full 7 watts
out. d I have checked the wiring about a dozen times and am getting
1.4 vdc on the violet wire which is hooked to the tip of the mic
connector and the blue wire is hooked to ground. The mic I am
currently trying to use is a Kenwood speaker mic I use on my Baofeng.
It works fine.

Suggestions, ideas, comments?

--
72 and God bless
KD4EPG

开云体育

I believe Dave has identified your problem area, if you wired up your mic jack per the wire up instructions your Kenwood/ Beofang mic won’t work. That mic has the audio/bias on the ring and ground on the sleeve the tip is not use for this purpose. So you’ll need to wire your uBITX or BITX to reflect that configuration unless you are only going to use it with your BITX’s. By the way also PTT is on the sleeve of the 2.5mm plug.

Thanks to you and Dave for the information... I was able to get it fixed by swapping that lead to the ring and sleeve instead of tip and sleeve. works like a charm.
--
72 and God bless
KD4EPG

you turned out to be correct again.. good job..? I had forgotten how I had the ICOM patch cable wired.. been years since I did that and I have slept a few times since.. LOL..

Working as it should.. thanks.
--
72 and God bless
KD4EPG