[Drake] Re: Drake Digest, Vol 35, Issue 11

[P Wells]

Very very interesting post Garey
Shouldn't Tony Parks be KB9YIG rathrer than  KB9IYG. I just did a Google and 
I get KB9YIG for Tony
----- Original Message ----- 
From: <drake-request at mailman.qth.net>
To: <drake at mailman.qth.net>
Sent: Tuesday, December 19, 2006 4:01 AM
Subject: Drake Digest, Vol 35, Issue 11


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>   1. Re: Drake 2-B as Selective Demodulator (Garey Barrell)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 18 Dec 2006 09:46:27 -0500
> From: Garey Barrell <k4oah at mindspring.com>
> Subject: [Drake] Re: Drake 2-B as Selective Demodulator
> To: drake at mailman.qth.net
> Message-ID: <4586A9C3.1010905 at mindspring.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Yikes!
>
> I always hate to see things like this......  :-)
>
> Unfortunately, this is a VERY nice idea.   Essentially all he's doing is
> making the BFO "tunable", using the Main tuning capacitor and dial
> mechanism, and using the Q-Multiplier socket on the rear panel to access
> the "INPUT" of the resulting "tunable IF".   He's just using the back
> end of the receiver from the Passband tuner through AF out.  Another way
> of looking at it is he is using the R-390 as a tunable front end for the
> 2-B.   I like that better!  :-)
>
> On the bright side, it IS an easily made and reversible modification.
>
> For the old timers, he's making the 2-B into a Q-5'er, which was a WW II
> aircraft receiver that tuned from 190 to 540 kHz.  It had an 85 kHz IF
> that was undercoupled to make it very selective, at least by 1950
> standards.  My receiver at one point consisted of a different aircraft
> receiver of the same family that covered 3-6 MHz with a WIDE IF at 1415
> kHz IF.  I could hear the entire 50 kHz Novice band without touching the
> Main tuning!  However, by coupling my clock radio to the IF and tuning
> IT to 1415 kHz, I had double conversion to 455 kHz AND Passband tuning.
> The addition of a Heathkit Q Multiplier to the clock radio (not a
> trivial exercise since the clock radio was AC/DC !) greatly improved my
> signal slicing capabilities.  Still later, a Q-5'er was coupled to the
> IF of the clock radio, giving me triple conversion, dual passband
> tuning, and really tight selectivity.  I was down to only three or four
> signals at one time!  And LOTs of knobs.
>
> Another very interesting project going on these days is the "Softrock"
> series of software designed receivers.  This is a small board that
> interfaces to the sound card of a computer, using the computer for all
> the "back end" duties.  It is also tunable over ~+/- 12 kHz.  Software
> is available to provide all sorts of DSP filtering capabilities and
> other features of "modern" rigs.  By setting the Softrock for 455 kHz
> (or ANY IF up to 30 MHz) it can be used for ANY receiver.  It's also
> CHEAP, a complete kit for less than $10 !!   Of course you gotta have a
> computer, but if you're reading this ......
>
> A good description of the FIRST version of this unit is shown at
>
> <http://www.amqrp.org/kits/softrock40/>
>
> The latest version is still available from the designer, Tony Parks,
> KB9IYG, at <raparks @ ctcisp.com> less spaces.
>
> 73, -Garey  K4OAH
> Atlanta
>
> Drake 2-B, 4-B & C-Line Service Supplement CDs
> <www.k4oah.com>
>
>
>
> Chris Kepus wrote:
>> W4THU converted a Drake 2-B receiver to a 455 KHz SSB/CW demodulator.  He
>> states on his web site that, "The conversion of the 2-B is simple and all 
>> of
>> the mods are removable in just a few minutes."
>>
>> http://radioworks.com/Hamshack/shack6ademod.htm
>>
>> I have sent him several e-mails but I apparently cannot get through his 
>> spam
>> filters or he is just too busy to respond.
>>
>> Has anyone on this list performed this conversion?  Has it worked well? 
>> I
>> have a couple of 2B's, one of which is a good candidate for this 
>> conversion.
>> Is there someone out there who can help me with the specific way to do 
>> this
>> mod?
>>
>> Thanks es 73,
>>
>> Chris
>> W7JPG
>>
>>
>>
>>
>
>
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> End of Drake Digest, Vol 35, Issue 11
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