Hi members of the bitx20-homebrew-fellowship !
Found some hours to spent on the BITX17 this Easterweekend and
discovered a major mistake I made. I had connected a 2k2 resistor of
Q13 between e and c instead of between b and c. Stupid me...I
corrected this and now i have fb quality SSB on Q14 with a signal
level of 200mV over 47 ohms. That should be fine. This explains the
strange things I saw, like the impossiblity to adjust the level of the
carrier wave component in the ssb signal with the variable resistor.
And the strong 2nd harmonic of the VFO (26.2 MHz). I did not even have
a proper ssb signal on 18 MHz ! I included a low-pass filter (cut-off
freq at about 9 MHz) after the VFO to kill the odd and even harmonics
Now I have to hook-up the MOSFET and its surrounding components and
see if i can get the rig on-air.
Bye the way, RX signals on 17m were fine this afternoon, heard ssb
voice, rtty, psk31 and cw. With a one-lambda (17 m) long-wire antenna
connected. Some signals clear enough to decode...
Does anybody have experience with one wave-length antennas (up till
now I have only used half or quarter lambda ant's..)
Bye bye and have a good Easter weekend (for what's left)
Ron
PA2RF
