[HBR] Cheap & Easy Selectivity

[Pat Bunn]

Regenerative IF was used in the 1942 ARRL Handbook receiver . I have 
recently built one. I don't think you are going to find it to be particulary 
worthwhile. It was used in a few commercial radios and was not well 
receceived.


Pat Bunn
N4LTA


----- Original Message ----- 
From: "Edward Swynar" <gswynar at durham.net>
To: <hbr at mailman.qth.net>; "homebuilttuberadios" 
<homebuilttuberadios at yahoogroups.com>; "Old Tube Radios" 
<glowbugs at piobaire.mines.uidaho.edu>; <AmRadGear at yahoogroups.com>; 
<boatanchors at mailman.qth.net>; "Welcome to the Novice Rigs List!" 
<novice-rigs at mailman.qth.net>; <antiquewirelessassociation at egroups.com>
Sent: Friday, August 21, 2009 9:51 AM
Subject: Re: [HBR] Cheap & Easy Selectivity


> Hi Gang,
>
> Well, 29 requests received here for scanned copies of the regenerative IF
> "RADIO" magazine article, 29 scans e-mailed to those very same interested
> parties...
>
> Last call---have I missed anyone...?
>
> ~73!~ Eddy VE3CUI - VE3XZ
>
>
> ***********************************************************
>
>
> ----- Original Message -----
> From: Edward Swynar
> To: hbr at mailman.qth.net ; homebuilttuberadios ; Old Tube Radios ;
> AmRadGear at yahoogroups.com ; boatanchors at mailman.qth.net ; Welcome to the
> Novice Rigs List! ; antiquewirelessassociation at egroups.com
> Sent: Thursday, August 20, 2009 3:43 PM
> Subject: Re: Cheap & Easy Selectivity
>
>
> Hi Again Everyone,
>
> If anyone is interested, I just finished scanning  the regenerative IF
> article from the November 1940 issue of "RADIO" magazine, and would be 
> more
> than pleased to send it along to whomever it is that might be 
> interested...
>
> It's two pages in length---I reduced the size & converted the files to 
> jpeg
> format, so that they might be a bit easier to download for those of us
> (myself included!) who are still still on dial-up internet service.
>
> As mentioned previously, this particular design---according to the
> author---goes one step beyond the simple "...two wires side by side to
> achieve regeneration in an IF stage" approach. Indeed, he says that not 
> only
> is the signal of interest boosted in strength by virtue of this circuit, 
> but
> interfering signals are actually reduced by a corresponding amount.
>
> As anyone knows who has ever tried a regenerative IF stage, this does not
> happen by design, i.e. the reduction in signal strength of adjacent
> frequency QRM.
>
> Anyway, it all sounds like a very neat design, albeit requiring the 
> trouble
> of having to wind a scramble-wound coil & installing it at the base of the
> secondary winding of the IF transformer.
>
> ~73!~ Eddy VE3CUI - VE3XZ
>
>
> ****************************************************
> ----- Original Message -----
> From: Edward Swynar
> To: hbr at mailman.qth.net ; homebuilttuberadios ; Old Tube Radios ;
> AmRadGear at yahoogroups.com ; boatanchors at mailman.qth.net ; Welcome to the
> Novice Rigs List! ; antiquewirelessassociation at egroups.com
> Sent: Thursday, August 20, 2009 11:13 AM
> Subject: Cheap & Easy Selectivity
>
>
> Good Morning All,
>
> I just ran across a sweet little article in a 1940 issue of the old 
> "RADIO"
> magazine on a fool-proof way of adding selectivity & gain in an IF stage
> that (supposedly) approaches that obtainable with a resonant crystal
> filter...but without the filter insertion loss, of course.
>
> The design is rather obscure in that I've never seen anything quite like 
> it
> in any ARRL publication. Suffice it to say that it goes a bit extra beyond
> the mere "...place-the-plate-lead-into-the-IF-can" approach of achieving
> feedback, yet it still looks very "do-able", and I plan to incorporate it
> into my 1929-style 12-tube superhet here.
>
> If anyone has access to any of the West Coast Handbooks of the late 30's,
> you'll see the design used in the "Super/Ultra Gainer" receiver designs
> described therein...
>
> Wish me luck!
>
> ~73~ Eddy VE3CUI - VE3XZ
>
>
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