[HBR] One 1st IF coil in HBR?

[Peter Bertini]

I'd worry about image rejection (first IF +/-  2nd Xtal LO.)  Selectivity,
skirt slope and stop band rejection are pretty much determined by the low IF
stages.  It shouldn't be too hard to make an simple transformer, as was used
in the HBR for coupling between the RF and main chassis sections) to improve
the image rejection a bit. A trap might be another possibility. Best to
follow the design, I am sure Ted only used exactly what was needed.

Peter

On Thu, Jun 24, 2010 at 7:20 PM, C Eus <catman351 at gmail.com> wrote:

> All:
> Has anyone used just one IF transformer for the 1650 kcs 1st IF? If so,
> what
> were the results? Is this possible to do so without compromising
> selectivity? Thanks. Cal.
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