[R-390] More C709 info

[Flowertime01 at wmconnect.com]

Barry, Tim,

I have not been keeping up with my mail.

Who wins in rock-scissors-pancake?

Stop and look what the receiver design is.

The VFO varies across it range. That happens to be 2.455 to 3.455.

The idea is to drive a mixer with the VFO output across that range.
Coming out of the mixer we would like every thing to have the same 
performance level no matter which point the VFO is set to.

The objective of C709 and the transformer is to compensate the loss of 
oscillator output as the oscillator frequency goes up.

If the VFO has more than enough output to make the mix, then the exact output 
level is a so what case. It is over the line, and more over the line is noise.

If some where across the range, the output is lower than minimum mix level 
then we loose some of the incoming signal into the noise floor. No so good. 

Barry, why do you want a peak in the middle of your mixer range?

Why should a tuned circuit not be flat across a span of 1MHZ?

I think pancakes fall to rock and scissors.

Other than you have played with the C and T and would like to get them back 
to their optimal value, I do not think you have a problem with the VFO output 
circuit.

Barry, every thing you have posted is right in line with how I find the VFO 
circuit to behave.

Roger.