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

[Robert Downs]

Further, it is possible that the input transformer and the interstage
transformer could be the same.  In most single conversion receivers with two
or more IF stages, the input side comes from a plate and the output goes to
a grid.  But the IF output transformer will usually be different because it
goes to a diode load.  At least in older sets.  If it goes to a tube type
product detector, it could be the same as the other two.

Robert Downs

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Donald Chester
Sent: Tuesday, October 12, 2021 12:57
To: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] What Are the Differences Between Input,
Interstage, Output IF Transformers?

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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