[HBR] Use of single 1610 kcs transformer?

[Edward Swynar]

Hi Cal,

Being rather ignorant of the actual specifics of the HBR (I confess!), I am
wondering if there is any sort of crystal IF filter ahead of the 1600-KHz IF
chain...?

If so, you're in luck: simply emulate what the Heathkit designers did with
the SB-300 series of receivers, i.e. they had the crystal IF filter FIRST in
the chain, & used NO IF "transformers" as such at all, but rather, a couple
of simple L/C paralleled circuits between stages---the selectivity was
afforded early-on, by way the crystal filter.

It works!

~73~ de Eddy VE3CUI - VE3XZ


**************************************

----- Original Message -----
From: "C Eus" <catman351 at gmail.com>
To: <hbr at mailman.qth.net>
Sent: Sunday, May 16, 2010 10:04 AM
Subject: [HBR] Use of single 1610 kcs transformer?


> All:
> I only have access to one genuine 1600 kcs IF transformer.  I do not have
> access to a second to emulate any of the HBR 1600 kcs dual IF transformer
> configurations.  What would be the "penalty" for not conforming to this
> configuration?  Obviously, selectivity issues may crop up.  However, I
plan
> on maintaining the triple 100 kcs IF transformer chain ala the W6SAI
"deluxe
> HBR" plan.  Looking for more comments/suggestions on this portion of the
> project.
>
> FYI, I just took a look at Jay Helm's IF strip set up.  Looks "kewl."
> However, my strip should be a little thinner.  The nice thing about the
HBR
> set up is one can, within reason, articulate a reasonable variation to
suit
> one's tastes.
>
> Cal, N6KYR/4
> ______________________________________________________________
> HBR mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hbr
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:HBR at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>