Thanks for the critique on the Printed Circuit board.
All very valid -
and yes we had caught each of those points.
Everyone picked up on the grounding problem -
and we had determined to put the PA on a separate board.
I think it is the instability and variability of the NTSC color crystal
which is accentuated by variations from manufacturing batches
but there appears to be something else
inherent in the design itself
that has caused Benson with the Warbler -
others with Softrock design -
and the two RF engineers who worked on ours for two years -
to abandon the design.
With all those corrections planned for the next board layout -
it was still determined/decided that the signal from the exciter
was never going to be stable enough
and that the amplifier was a poor design also
that others had difficulty with.
The world changes - and nothing is impossible -
to say that we couldn't come back to it -
but the consensus at this moment is that we should move on -
and I am very much interested in examining the approach
that Dave has proposed:
A rather simple way to obtain a crystal controlled channelized 80 meter SSB transceiver is to mate a CB SSB transceiver ($130 in single quantities) to a transverter.
A Mini-circuits ADE-1L mixer and a 23.410 MHz LO convert 3.555 MHz to 27.405 MHz (CB channel 1), CB channel 1 to 40 give frequencies of 3.555 to 3.995 MHz
ADE-1L mixer and 23.410 MHz LO
PA using two inexpensive MOSFETs
Once again - anyone interested in helping us to pursue this -
you can help by emailing me directly at:
bruce at webpal.org
Peace and love,