Hello to everyone,
I just purchased a Corsair-II which I have not received as yet, and I
wondered whether I should sell my Omni-D (with 30 and 12 M and all
filters)? How does the Corsair-II stack up on cw to the Omni-D?
Thanks for your comments.
73s and all the best for the new year,
Mark
Steve Ellington N4LQ wrote:
> The attached link shows the sidetone for an Omni V which produces a
> sine wave. I've outlined the Bridged-T oscillator in red. The older TT
> rigs used the relaxation oscillator which produced a sawtooth wave. I
> don't have the diagram for the Corsair but most TT rigs including
> Triton, Argosy, Omni A/D, Corsair used the relaxation osc. The Delta
> 580, Paragon 1&2 and Omni V used this T oscillator. Q1 is likely
> already in the old circuit. The ST line is your T voltage and Q1 is
> simply a switch to ground the emitter of Q2 for keying the sidetone.
> Pitch and Level controls are probably the same value and can remain in
> the circuit.
> I used the "ugly" method of construction i.e. I removed the FET
> transistor and a few parts from my old Omni C, cut the foil in a few
> places and haywired the parts as neatly as possible. I recommend doing
> this project in one setting otherwise your train of thought will
> derail. It wouldn't hurt to read up on the bridged T oscillator in the
> ARRL Handbook before starting. The only critical parts are C2, C3, R4
> and R5. These should be balanced in value as shown. Variations in
> value will result in frequency changes.
> http://members.iglou.com/n4lq/img/sidetone.htm
> Steve N4LQ
>
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