[AMRadio] Frequencies

Rick Brashear rickbras at airmail.net
Thu Jan 25 19:31:25 EST 2007

Yes, it is a dual conversion.  When you go higher than 7.400 mc you add 
3.955 mc to the desired frequency instead of the IF frequency of 455 
kc.  As you move further up in frequency you divide the desired 
frequency by two, three or four to derive the fundamental.

Thanks for the heads up.

Jim Candela wrote:

>   Isn't the SP-600 a dual conversion receiver? Maybe it is dual conversion on the higher bands, but single conversion on 75m. Depending on whether single or dual, the crystal frequency you need might be different. If dual, isn't the 2nd LO free running like on a Gonset G-76? If so, you better measure it's exact frequency to assist in the crystal selection.

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