[ARC5] RAX If Frequency

[releazer at earthlink.net]

Well, here is an observation of mine.  The AM BCB is a logical place to put IF's, since it is the only suitable frequency range that is NOT of interest to the military except for navigational purposes, and for that you use the ADF gear.  And 915 KHZ is not one of the allowable AM broadcast frequencies.  We have a 920 Khz station here locally and I hear it whenever I crank up a BC-348, but actual signals in the received band override it easily.  And the BFO in the BC-348 is not going to jam any BCB stations in the ADF.
 
A similar question would be why would they choose 456 KHZ as the IF in the GRC-9.  I assume that it was because they used a BFO operating at 1/2 the IF frequency and they did not want to have to deal with the 0.5 KHZ difference.  Now as to why they chose 1/2 the IF frequency for the BFO, you got me here.

Wayne
WB5WSV