[Milsurplus] When You Can't Get an IF Can

[robinson at tuberadio.com]

Hi Dave,

How about an RFC in the plate cct
(replacing the primary)
and a coupling capacitor across the top?

Or alternatively,
swap primary for secondary,
and put the RFC where the secondary is.
This will make the primary tunable to a peak (good Q)
and as the secondary is usually loaded by the diode in V4
it has a low Q anyway
and thus is broad as a barn
and not much gain to be had.

Maybe no need for a resonator,
as the radio is probably broad
and on 3885
and short range anyway.

Regards
Ray



 David Stinson <arc5 at ix.netcom.com>
> To: "Boatanchors at mailman" <boatanchors at mailman.qth.net>,
> 	"milsurplus at mailman" <milsurplus at mailman.qth.net>
> Subject: [Milsurplus] When You Can't Get an IF Can
> Message-ID: <e2b4084c-d059-bffc-19f7-2c8cb4e0fbae at ix.netcom.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Good Morning.
> Theoretical situation-
> You have an IF transformer with an open primary.
> For whatever reason, you cannot get a replacement
> or suitable substitute.? Some of you will recognize
> this diagram:
>
> https://photos.app.goo.gl/qtLG7oEEP73Lg7Yt6
>
> Possible solution:
> Use a 455 KC Ceramic Resonator-
>
> https://photos.app.goo.gl/SbYwxAEzubXCkGU27
>
> The 10 Ohm resistor is because that was the DC
> resistance of the secondary winding.
>
> Thoughts?
>
> 73 DE Dave AB5S
>
>
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> End of Milsurplus Digest, Vol 197, Issue 42
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