[HBR] Homebrew IF transformers

[Bill]

Not to deprive you of the pleasure of doing what you have outlined, but if
push comes to shove I am sure that I can find three 85 kc IFs from an old
command set around here.

Yours for the postage.

Bill Fizette  W2DGB
----- Original Message ----- 
From: <shoppa_hbr at trailing-edge.com>
To: <hbr at mailman.qth.net>
Sent: Saturday, September 17, 2005 10:05 PM
Subject: [HBR] Homebrew IF transformers


> Unlike most of you guys, I don't have a garage full of command sets
> to strip IF transformers from.  So I'm looking at what I'd have to
> do to make my own IF transformers from scratch.
>
> On usenet I found a reference to
>
>   http://geek.scorpiorising.ca/455KHz.html
>
> and it seems perfectly practical to do this sort of thing.  For 100kHz
> or lower obviously I'd use bifiliar or more-filiar windings to keep
> the Q high.
>
> The universal windings ought to be straightforward - I recently built
> a jig to let me re-wind burnt out RF chokes and while my setup is far
> from "automatic" it works fine.
>
> Combine with a couple small caps/trimmers and I think I can make
> some nice little transformers I can put in a can.
>
> Would the result be a complete basket-case or am I barking up the
> right tree?
>
> Finally found a real nice Millen dial drive and I just gotta build
> me an HBR (well, HBR-alike.)  Even though it'll take me years at
> this rate!
>
> Tim.
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