[ARC5] 80 KHZ IF

[Scott Robinson]

Drake R-4A has last IF of 50 KHz, with complex R-C filters to define 
bandwidth.

/Scott Robinson

On 3/8/23 12:28 PM, frledda at att.net wrote:
> The National FRR-59 / WRR-2 used 80kHz IF with crystal filters. IMO, the 
> best sounding SSB ever!
> 
> Best, Francesco K5URG
> 
> CCA President
> 
> *From:* arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> *On 
> Behalf Of *Dennis Monticelli
> *Sent:* Tuesday, February 2, 2021 10:47 AM
> *To:* Robert Eleazer <releazer at earthlink.net>
> *Cc:* ARC-5 Maillist <arc5 at mailman.qth.net>
> *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 <releazer at earthlink.net 
> <mailto:releazer at earthlink.net>> wrote:
> 
>     I recently augmented my collection of National receivers with
>     anNC-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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