[HBR] Cheap & Easy Selectivity

[Pat Bunn]

Did you like the regen IF  - or did it have Regen IF? I only use mine at 7 
mhz and down and did not find the regen IF worth the trouble.

Pat
N4LTA
----- Original Message ----- 
From: <kf4tap at yahoo.com>
To: "HBR Receiver List" <hbr at mailman.qth.net>
Sent: Friday, August 21, 2009 11:45 AM
Subject: Re: [HBR] Cheap & Easy Selectivity


>I built the one in 43 Hb. I liked it. Thinking of building another.  Keith 
>kf4tap.
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: "Pat Bunn" <pbunn at matrixei.com>
>
> Date: Fri, 21 Aug 2009 10:14:38
> To: HBR Receiver List<hbr at mailman.qth.net>
> Subject: Re: [HBR] Cheap & Easy Selectivity
>
>
> 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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>
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