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


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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 
preselector at 0,,, adjust the 4,,, 3.5M caps. for max s-units
         Maybe using a harmonic for sensitivity?

Step 4, Set xtal to NORM, preselector to 3.9 adjust T-1 through T-4 for max 
s-units.

Steps 1, 2, 3, seem to be a preparation for tuning T1/T4 in step 4.

Step 12 has you retune the 4 caps for the 3.5 band in NORM pos.

When it gets to the bottom of the page (35) for peaking the 4,  1.5/3.0 
caps, step 13,  It instructs you to use that 13.6 xtal with the preselector 
at 6.

Page 35 has you use the 13.6 xtal to tune 2.5 WWV to adjust the 100kc osc.. 
That's the only part of that xtal that is straight forward.

I want to do this right, but it seems that skipping the first 4 steps 
(T-1/T-4) would be the sensible thing for me  to do. The rx works good, but 
I know it could work better.

As always thanks all for the advise and guidance,  George KB2Z






At 09:41 PM 2/7/04 -0600, you wrote:


>Hi George,
>
>Think you mean a 12.6 MHz for 160m?  I just ignored the 160m
>alignment procedures on my R4A and had no trouble without it.
>
>I'm pretty certain all the R4/T4/TR3/TR4 series use series resonant
>3ed overtone HC6/U crystals.  The +/- 50 ppm standard tolerance
>seems to work fine for me.  I've had to replace a few in TR3/TR4
>that were WAY off frequency.  I'd be wary of buying any old
>crystals even though I haven't seen this in R4/T4's.  I've had good
>luck with Petersen Radio for new "rocks" and received stuff the
>same week I ordered them.  I just email him exactly what I want
>and typically get the crystals way before I get the bill.  So far
>they have been dead on freq., fast and I like doing business in
>that manner.
>
>73,
>- Mark K9MRK
>----------------------------------------
>
>Petersen Radio co., Inc.:
>Jjk51503{at}aol.com
>
>Drake 4 series spec.:
>HC6/U holder
>3ed overtone
>Series resonant
>+/- 50 ppm tolerance (std.)
>---------------------------------
>Thank you for the inquiry.  The crystals are $11.00 each plus $3.50 
>postage for up to 5 crystals.  Delivery is usually 2 - 3 weeks
>and payment may be made by check or money order upon your receipt of the 
>invoice.  If you want to order, I need to know the type of
>holder that you need and your mailing address.
>
>
> > Good evening all,
> >
> > Would anyone have a spare, "13.6 mc parallel resonant third overtone
> > crystal designed to operate into circuit capacity of 32 pf"?
> > I need one to align an R-4 per the manual.
> > Is there a work around to peak it without the crystal?
> > I can order a new  one if needed.
> >
> > Thanks in advance, George KB2Z
>
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