[R-390] Off-topic IF question

[Bill Smith]

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:billsmith@ispwest.com]
> 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
> billsmith@ipswest.com
>
>
>
> ----- Original Message -----
> From: "Scott, Barry (Clyde B)" <cbscott@ingr.com>
>
> >
> > Were there common IFs on 465kc?  It seems odd to be so close to the
> defacto standard, but not quite there.
> >
> > Thanks,
> >
> > Barry - N4BUQ