Soft Rock V7 with 28.06 MHz crystal
- I just completed building the unit and found that I could not get a
image null below -40dB. Measured the phase difference between S0 and S1
was over 120 degree's using a HP 8405A Vector Voltmeter. Removed C9 and
placed a subminiature 7pF variable capacitor, was able to obtain a
image null of over -70dB after adjusting C9 also measured the proper 90
degree phase difference.
The MDS was around -107dBm and oscillator frequency (28.052618 MHz) was
close to the results posted for the Soft Rock 7 Beta.
Thank you again for an interesting small project
Bob Johansen WB2SRF