[ARC5] 80 kHz IFs

[MICHAEL BITTNER]

Many 1930s BC Receivers 175 kHz IFs

Most Automobile BC Rcvrs 262 or 262.5 kHz IFs

ALL-STAR SWL Receivers  370 kHz IF

BC-1206 LF Receiver    135 kHz IF

QST HBR HF Receivers  100 kHz IFs although some used surplus 85 kHz IF transformers instead.

Hammarlund HQ-180A     60 kHz IF

Early 1920s BC Receivers 30-40 kHz IFs  The IF transformers were untuned and looked like audio transformers.

My 2-cents worth.  Mike W6MAB



> On February 2, 2021 at 12:06 PM "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote:
> 
>     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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