Most of the carrier should be getting suppressed by the balanced modulator.
If the carrier is about as strong as your main signal, look very hard at D5 and T7,
perhaps a broken or shorted transformer wire, possibly a blown diode.
The node from T7 back to C63 and C50 should have zero volts when there is no mike input,
a fraction of a volt of AC audio centered on ground when there is mike input.
If the carrier is mostly suppressed but enough there to be a bit annoying,
then could be you need to get into the menu and move the BFO further away from the filter passband.
Any idea what all you did between when it worked and when it didn't?
Were you messing around with the BFO in the menus?
Applying several volts of audio to the modulator somehow, enough to blow the diodes?
Significant mechanical shock to the rig?
My best guess is a cold solder joint, short, or broken wire at T7.
Jerry, KE7ER
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On Fri, Mar 15, 2019 at 06:02 PM, Karl Heimbach wrote:
Thank you all for the suggestions on how to interface a soundcard with the ubitx.? I ended up using an EasyDigi.? However, in all of the experimenting before getting an EasyDigi, I've managed to destroy something in the radio.? Now I find that when using the microphone and keying it, I have a carrier present. The radio will transmit SSB, but with the unsuppressed carrier along with it.
I can also now transmit PC generated digital modes, but also along with it, the? unsuppresed carrier.? CW is as normal and receive in all modes is unaffected.
SSB worked properly two weeks ago, which was before I started attempting to interface to a PC.? I've destroyed a component I would guess, but have no idea of which one it may be.? Looking at the board, there is nothing obvious.
Any ideas as to what I've broken?
Thanks,
Karl - W5QJ
