It looks like Pete Juliano, N6QW, and I will be able to do Part III of our discussion of homebrew SSB gear this Saturday. We might start out with ladder filters. Other possible topics include construction practices (shielding, decoupling, the handling of heat, etc), junk-box practices, essential test gear and, time permitting, tube (or, as Grayson would say, "thermatron") gear. Speaking of which, here are some pictures that Pete sent me of a 20 meter CW rig he is working on.
"Here is a 20 Meter station that I recently got working and hope to have it on the air soon. The Rx is something I cobbled together and it does have a Crystal filter. The Tx is an amalgamation of several Handbook radios – one feature it uses a bandpass tuning network from the oscillator to the final. The screen voltage has a separate regulator. Each unit size is 4 inches high, 4 inches wide and 8 inches long. There is still some work needed for the control and TR."
Hi,
ReplyDeleteThanks for the call out. One of the details and likely a technical one is Amps that Oscillate...
Mechanical layout is certainly an issue. However,
Some devices like the IRF510 are problematic of not
understood. That being Feedback. If you layout is good then there are the subtle RF stuff that being the devices feed back capacitance from drain to gate
and if the circuit does not allow and compensate for that your going to have a battle. An example is Bert's BITX (solder smoke 162).
Allison/kb1gmx