[ARC5] 80 kHz IFs

[Kenneth G. Gordon]

On 2 Feb 2021 at 8:53, Robert  Eleazer wrote:

> Of course I at once thought of the BC-453 and similar command sets, with
> its 85 KHZ IF.  I had no idea that any HF receiver used that low an IF. 
> How common is this?

Quite common during one period of receiver design. Many receivers,
especially Hallicrafters' better ones, used a 50 kHz second IF in order to
get the selectivity needed.

Some articles on receivers in the ARRL Handbooks also included articles on
IF strips at 50 kHz.

>  Was 
> the BC-453 use as Q5er the inspiration for this?

I don't know for sure, but I would think not so much. Low IF frequencies
were first used, IMHO, by the telephone company back in the 1930s.

Ken W7EKB
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