From: George KB2Z 
Subject: Re: [drakelist] Needed: 13.6mc R-4 x-tal


--=======482F616E=======
Content-Type: text/plain; x-avg-checked=avg-ok-61AC1C; charset=us-ascii;
format=flowed
Content-Transfer-Encoding: 8bit


Hi Garey,

I just downloaded a R-4a manual from BAMA and I see what you, Mark, and Ken 
were talking about.
I'm going to do the alignment leaving the Ts at peace for now. It could 
always be done again when/ if I get the xtal, depending on how well it 
perks up. I found this blurb for 5M WWV in the QST section at THE Virtual 
Museam. Plenty of great info there.

WWV ON DRAKE RECEIVERS
It is possible to receive the 5-MHZ transmission from WWV on a Drake R-4A 
by setting the band switch to 3.5 MHz, the tuning dial to 3.6325 MHz, and 
the preselector to 4 0 meters . The second harmonic of the VFO beats with 
the 5-MHZ WWV signal to produce a signal at the first i-f.
Donald R. Stickle, K2OXP
(c) QST March 1971 page 48

Again many thanks, George KB2Z


At 11:00 AM 2/8/04 -0500, you wrote:

>George -
>
>Interesting problem.  I had one of the very first R-4's in 1965, but moved 
>to an R-4A as soon as they came out.  I just recently picked up another R-4.
>
>Anyway, this alignment procedure is specific to the R-4.  All the other 
>R-4 series receivers make a mechanical measurement of the four slugs in 
>T1-T4 for each band setting of the Preselector control.
>
>The manual for the R-4 says to use the 13.6 MHz crystal with the dial set 
>to 1.000.  This would set the receiver to 3.0 MHz, and with the 
>Preselector at "0" has you adjust the four 3.5 MHz trimmers
for peak at 
>3.0 MHz.  You then switch in the NORM 14.6 MHz crystal and adjust T1-T4 to 
>peak at 4.0 MHz.  Repeated iterations of adjusting the capacitors at 3.0 
>MHz and the slugs at 4.0 MHz should eventually result in the combination 
>"tracking" over that 1 MHz range.
>
>I can only assume that this procedure is to set the mechanical locations 
>of T1-T4, since the measurement procedure specified in other R-4 manuals 
>is NOT used in the R-4.  In fact, all the later manuals warn against 
>moving the individual slugs and insist that they all be exactly the same 
>"height" at a given Preselector setting.
>
>I don't know if you could just line up all the slugs mechanically, since 
>obviously Drake didn't control the height of the windings in T1-T4 in the 
>R-4. They probably found that they "could" control the winding height 
>precisely enough to eliminate this (relatively) complex alignment 
>procedure in favor of simple measurements, and used that method from then on.
>
>To be assured of maximum sensitivity in the R-4, I guess you'd have to 
>invest in a 13.6 MHz crystal.  It doesn't have to be anything special, 
>since the dial is tuned to the correct frequency.  You could use a 13.5 
>MHz crystal and adjust the dial to 0.900, etc. so you might find a junkbox 
>crystal (i.e., 13.543 MHz) that would allow you to tune the receiver to 
>3.0 MHz at "some" point on the dial for the "T" adjustments.
>
>Or you could just leave the slugs where they are and hope no one has 
>messed with them since they left the factory!  :-)    Just start with step 
>8 in Section E.
>
>There is a way, although I've forgotten how, to receive WWV on the R-4 
>series receivers by using the "other" mixing product on one
band.  Seems 
>like you set the bandswitch to 20M and set the Preselector in the 40M area 
>to get 10 MHz WWV.  It's described in a Hints and Kinks in March 1971 QST, 
>but I can't get to my 1971 QST's at the moment!
>
>73, Garey - K4OAH
>Atlanta
>
>George KB2Z wrote:
>>Hi Mark,
>>In my original post that's the reason I asked if there was a work around 
>>for the alignment.
>>The rx has a 12.6 xtal installed.
>>Per the manual,  (p.32 alignment  instructions) 13.6 mc x-tal required.
>>The manual I have is from BAMA, but I checked it against the one at WB4HFN.
>>http://www.wb4hfn.com/DrakeManuals/R4/Manual_R4.htm
>>Page 34, steps 1, 2, 3 says to use that xtal with Band at 3.5 and 

---