The BFO being too close is what I also found to be a source of too much 'carrier leakage'.? I think I was getting about 1 to 3 milliwatts leakage when the BFO was set to my liking and transmitting ssb.? .? This was after I had modified the filter by replacing the 5 100 pf capacitors with 5 82 pf capacitors. I had also modified the BITX by replacing the outputs and a few other resistor changes as have been mentioned on here.
On Sat, Jul 28, 2018 at 1:49 PM, ajparent1/KB1GMX <kb1gmx@...> wrote:
Usually carrier at that level may indicate the BFO needs to be set a bit further away.
The uBitx has issues with carrier leakage but usually not that bad, so check the carrier frequency first!
Joel,
While the diodes are well matched the transformer is still handmade though fairly good. To assure balance a 50 ohm pot at the winding center tap pins 5 and 3 would help. The RF would be on the wiper and the two wires to the ends.? Mount it under the board with short leads.
