[R-390] Off-topic IF question

[Al Solway]

Bill, 

Your right. IFs are and varied. I have a Transceiver made by Canadian
Marconi in 1942, Model ATR5, Freq 3.0 - 6.3 Mc in any 2 crystal
controlled channels. Used in fighter A/C of the day. The IF is 456. It
will be restored next winter. 

Also have a Philco Model 38-10. The IF is 470.

Al VE2TAS

Bill Smith wrote:
> 
> In a word, yes.  The 455 KHz as a standard (one I grew up with) is "recent".
> 
> Probably a variant among manufacturers, or style, or preferences, but
> receiver manufactures have used a wide range of IF frequencies.  445, 455,
> 465, 485 among others, seem to be related to the use of crystal filters. (Is
> this true?)   Early supers used frequencies as low as 185 KHz.
> 
> 73 de Bill, AB6MT
> billsmith@ipswest.com
> 
>