The National FRR-59 / WRR-2 used 80kHz IF with crystal filters. IMO, the best sounding SSB ever!

Best, Francesco K5URG

CCA President

From: [email protected] <[email protected]> On Behalf Of Dennis Monticelli
Sent: Tuesday, February 2, 2021 10:47 AM
To: Robert Eleazer <[email protected]>
Cc: ARC-5 Maillist <[email protected]>
Subject: Re: [ARC5] 80 KHZ IF

Not at all uncommon for the high-end of a model range in that era to have a low final IF.   Those short wave radios were double and sometimes triple conversion.  I used a Hammalund HQ-170 way back when that had triple conversion with IFs of 3035, 455, and 60.

Dennis AE6C

On Tue, Feb 2, 2021 at 5:53 AM Robert Eleazer <[email protected]> wrote:

I recently augmented my collection of National receivers with an NC-300.  I previously have done quite a lot with the Cosmic Blue series of receivers, specifically the NC-155, NC-270, and NC-190, and was quite surprised to see that while the NC-300 had the same first IF as those other sets, 2215 KHZ, it has an 80 KHZ 2nd IF.

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?  Was the BC-453 use as Q5er the inspiration for this?

Wayne

WB5WSV   

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