[ARC5] 80 KHZ IF

[Fuqua, William L.]

Guess I am getting old, but I do seem to remember a communications receiver with a 17kHz last IF. The low frequency IF allowed the designers to design filters with sharp skirts with more ordinary components without using crystals or mechanical filters.

73
Bill wa4lav

________________________________
From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> on behalf of Hubert Miller <Kargo_cult at msn.com>
Sent: Tuesday, February 2, 2021 1:26 PM
To: arc5 at mailman.qth.net <arc5 at mailman.qth.net>
Subject: Re: [ARC5] 80 KHZ IF

CAUTION: External Sender


The Eddystone 750 receiver has a second IF of 85 kHz. At first I thought, similarly to you,

that this had some basis in the Command Sets receivers, like using surplus IF cans, but

no. In the 750, the IF coupling is mechanically variable.

-Hue Miller
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