[R-390] Off-topic IF question

Mon, 7 Jan 2002 16:39:13 -0600

I was thinking of today; however, as someone else has pointed out, the receiver in question does not use crystal filtering so the point becomes moot (at least for that radio).

73,

Barry - N4BUQ

-----Original Message-----
From: Bill Smith [mailto:[email protected]]
Sent: Monday, January 07, 2002 4:25 PM
To: R390 (E-mail)
Subject: Re: [R-390] Off-topic IF question

Not sure if you are speaking of today, or when the receivers were
manufactured.  In manufacture, I would expect that crystals were built to
order and manufacturing a specific crystal frequency wouldn't have been an
issue.

Manufacturers such as Gilfillin, Philco, Hallicrafters used different IF
frequencies in different models.  Don't know why.

> My thinking is that if it uses crystal filtering, 465kc crystals might be
harder to find that 455kc.  True?
>
> Barry - N4BUQ
>
> -----Original Message-----
> From: Bill Smith [mailto:[email protected]]
> Sent: Monday, January 07, 2002 1:53 PM
> To: R390 (E-mail)
> Subject: Re: [R-390] Off-topic IF question
>
>
> In a word, yes.  The 455 KHz as a standard (one I grew up with) is
"recent".
>
> Probably a variant among manufacturers, or style, or preferences, but
> receiver manufactures have used a wide range of IF frequencies.  445, 455,
> 465, 485 among others, seem to be related to the use of crystal filters.
(Is
> this true?)   Early supers used frequencies as low as 185 KHz.
>
> 73 de Bill, AB6MT
> [email protected]
>
>
>
> ----- Original Message -----
> From: "Scott, Barry (Clyde B)" <[email protected]>
>
> >
> > Were there common IFs on 465kc?  It seems odd to be so close to the
> defacto standard, but not quite there.
> >
> > Thanks,
> >
> > Barry - N4BUQ

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