[ARC5] 80 kHz IFs

[Dennis Monticelli]

The low IF advantage continued into the DSP era.  A low IF (11 to 30KHz)
meant the ADC did not have to be as fast and could be optimized for a wider
dynamic range instead and/or consume less power.  If not preceded by a
higher IF to address the image problem, the receiver could employ an IQ
mixer and use two ADCs operating on the quadrature signals to address the
unwanted image or sideband.

Dennis AE6C

On Tue, Feb 2, 2021 at 9:08 AM Kenneth G. Gordon <kgordon2006 at frontier.com>
wrote:

> On 2 Feb 2021 at 8:53, Robert  Eleazer wrote:
>
> > Of course I at once thought of the BC-453 and similar command sets, with
> > its 85 KHZ IF.  I had no idea that any HF receiver used that low an IF.
> > How common is this?
>
> Quite common during one period of receiver design. Many receivers,
> especially Hallicrafters' better ones, used a 50 kHz second IF in order to
> get the selectivity needed.
>
> Some articles on receivers in the ARRL Handbooks also included articles on
> IF strips at 50 kHz.
>
> >  Was
> > the BC-453 use as Q5er the inspiration for this?
>
> I don't know for sure, but I would think not so much. Low IF frequencies
> were first used, IMHO, by the telephone company back in the 1930s.
>
> Ken W7EKB
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