[Drake] Re: TR4-CW {Band to band alignment}

Fri, 23 May 2003 22:13:11 -0700

International Crystal is the ONLY place to buy crystals!
I tried the others... Always went back!

73
Jim W7RY

----- Original Message ----- 
From: "David Harmon" <[email protected]>
To: "'Barry L. Ornitz'" <[email protected]>; <[email protected]>
Cc: <[email protected]>
Sent: Friday, May 23, 2003 9:44 PM
Subject: RE: [Drake] Re: TR4-CW {Band to band alignment}

> Barry...what you say is true...just last week I ordered 6 xtals from ICM
> for a KWM-2. Not only did the lady know exactly what I was talking
> about, they had the Collins specs. All they wanted from me was the
> frequency and the holder style. When the xtals arrived the xtals worked
> just like they should have...not cheap at $20 each but all of them
> worked as they should the very first time...and that's worth something.
> 
> Dave K6XYZ
> 
> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of Barry L. Ornitz
> Sent: Friday, May 23, 2003 8:33 PM
> To: [email protected]
> Cc: [email protected]
> Subject: [Drake] Re: TR4-CW {Band to band alignment}
> 
> 
> Steve, K2FW, noted:
> 
> > I have a Drake TR4-CW/rit & when I change bands, the
> > calibrated freq changes at least 5kc or more.  In other 
> > words, I have to re-calibrate in excess of 5 kc & on some 
> > bands 15kc.  Is there anything I can do to correct this?   
> > I've looked through the alignment directions in the manual, 
> > but didn't see anything.
> 
> This is due to problems with the band-select crystals in the 
> pre-mixing scheme.  The crystals originally supplied by Drake 
> were fairly accurate and designed to work into the proper load 
> capacitance.  Either your crystals have drifted, or (more 
> likely) someone has replaced the crystals with less accurate 
> ones or ones designed to work into a different load 
> capacitance.
> 
> If you have a frequency counter, you can check for the proper 
> frequency of each crystal and determine which ones are far 
> enough off to replace.  There will always be some deviation, 
> but typically it should be less than +/- 3 kHz.  I strongly 
> suggest ordering new crystals from International Crystal or 
> another reputable dealer.  
> 
> [I personally have never had a crystal made by JAN Crystals 
> meet specifications.  Perhaps they are better today, but I 
> quit ordering from them 20 years ago.  I have never had 
> anything but perfect crystals from ICM.]  
> 
> International Crystal likely has the proper load capacitance 
> information on file for your radio if you specify the model 
> and serial number when ordering.
> 
>         73,  Dr. Barry L. Ornitz     WA4VZQ     [email protected]
> 
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