[ARC5] 80 kHz IFs

[Glenn Little WB4UIV]

What receiver used a 40Kc IF?
I have some tunable 40 Kc transformers made by RCA.

Any ideas?

73
Glenn
WB4UIV

On 2/2/2021 2:45 PM, MICHAEL BITTNER wrote:
> 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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> 
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-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"