[Boatanchors] What Are the Differences Between Input, Interstage, Output IF Transformers?

[Richard Knoppow]

    The 51J3 has a similar filter. Forgot the exact frequency but 
about 1250Khz.

On 10/12/2021 10:57 AM, Donald Chester wrote:
> Just what it says.  The input transformer feeds the first i.f. stage, following the mixer/converter stage.  The interstage transformer is the coupling transformer between two i.f. stages.  The output transformer follows the final i.f. stage and feeds the detector.
> 
> The "tweet filter" in the front end of the Collins 75A-4 is tuned to a specific fixed frequency in the low end of the 80m ham band, to attenuate a spurious carrier that appears on that frequency, a harmonic (or image frequency thereof), of the 1st conversion stage crystal oscillator. Its function and adjustment procedure are fully described in the manual.
> 
> Don k4kyv.
> 
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL