[Heathkit] SB-620 info

[Jim Brannigan]

I am taking another run at converting the SB-620 "Scanalyzer" to a 455kc. IF

Does anyone know the mixer oscillator injection frequency for a 455kc
conversion?  It is not
stipulated in the manual or on-line sources.

Here is my guess:
The IF of the Heath "Scanalyzer" is 350kc.
To convert 455kc., the oscillator may be either 805 or 105kc.
The "high" injection of 805kc produces first order products of 350 and
1260kc.
"low injection of 105kc produces 350 and 560kc.

The "High" injection products are further apart and it would be easier to
filter the unwanted sum frequency.
So my "guess" is 805kc.
I know the value of the parallel capacitance.  If the oscillator frequency
is known, I can calculate the coil inductance.

Any help or ideas greatly appreciated.

Jim