Tayloe Mixer with Amplifier

[@R2AUK]

1:45 Just wanted to let you know that the resistor you are using looks like a wire wound one. It is far from 50 Ohms on 14 MHz, more like an inductor. I would advise using non-inductive resistors (metal film, metal-oxide). These are usually rated for 1-2W maximum, thus you will need several in parallel.

[@na5y]

Thats a good catch Alex thank you - and explains some unusual SWR readings I was seeing on the KX3 while transmitting into it. I'll definitely change that

[@na5y]

Just measured the resistor - 3uH, which is 260 ohms impedance at 14MHz. Going to redo the test with metal film dummy load and see how that changes the results

[@stevew9945]

Would be interested to see comparison with commercial set, keep up the interesting videos

[@na5y]

Thank you for the comment Steve

[@jeroldponko7168]

Nice. I looks like you got more than 50dB of opposite sideband suppression with your bias adjustment. I would like to see the comparison to the KX3.

[@na5y]

Sure I'll do a separate vid on the KX3. Thank you for the comment Jerold.

[@na5y]

Here you go kzbin.info/www/bejne/r5m8qmpujbhjr7M

[@DAVIDGREGORYKERR]

have you got a switch that lets you select LSB or USB?

[@na5y]

Yes - you can either do it in software by swapping the coefficients in the DSP (in passthru.c at github.com/thaaraak/ESP32-Transmitter/blob/master/main/passthru.c ) // Lower Sideband fir_filter_cfg.firLen = 300; fir_filter_cfg.coeffsLeft = coeffs_300plus45; fir_filter_cfg.coeffsRight = coeffs_300minus45; // Upper Sideband fir_filter_cfg.coeffsLeft = coeffs_300minus45; fir_filter_cfg.coeffsRight = coeffs_300plus45; Or you can do it in hardware by swapping the LO signals from the si5351. Thank you for the comment David!