[Hammarlund] Going to need 3.5MHz Xtal for SP600 JX17

Sun, 1 Jun 2003 13:23:17 -0500

Nope. 3.58 MHz is too high. This would mix with the 3.955 signal from the
first mixer to produce an IF output at 365 kHz, missing the desired 455 kHz
center by a country mile. Not even the 15 kHz wide selectivity could
accommodate this error. It would make trying to tune a given frequency a
bear. Low IF realignment is out of the question. It would also mean that the
lowest three selectivities would be useless because they rely on the series
resonance of the 455 kHz Xtal in T3, and of course the BFO would be useless.

Phil needs a 3.500 (000) MHz Xtal, and I imagine the tolerance needs to be
100 ppm or so.
This puppy is well be worth the expense of a International Crystal or James
or whoever is doing this now.

my 2-cents
Dick K9FFK

 -----Original Message-----
 From: [email protected]
 [mailto:[email protected]]On Behalf Of Patrick A.
 Thompson Sr.
 Sent: Saturday, May 31, 2003 10:55 PM
 To: Phil Atchley; [email protected]
 Subject: RE: [Hammarlund] Going to need 3.5MHz Xtal for SP600 JX17

 Is 3.58 MHz (as in color burst frequency) close enough?

 Those should be easily available.

 Pat
 wa4tuk

 > -----Original Message-----
 > From: [email protected]
 > [mailto:[email protected]]On Behalf Of Phil Atchley
 > Sent: Saturday, May 31, 2003 10:06 PM
 > To: [email protected]
 > Subject: [Hammarlund] Going to need 3.5MHz Xtal for SP600 JX17
 >
 >
 > Hi.
 > It looks like another JX17 along with an HC10 is going to find
 it's way to
 > my QTH tomorrow afternoon (haven't had a SP600 for a couple years
 > now).  The
 > HC10 is supposed to be working FB, the JX17 will need some TLC to put
 > operational. First order of the day is to find a replacement 3.5MHz 2nd
 > mixer Xtal for the one that is missing from this unit.  2nd order
 > of the day
 > will be a complete re-cap/electrical overhaul of the unit.
 >
 > I've wanted an HC10 for some time so this will be a boon as I
 > already have a
 > couple receivers I'm planning on "tapping" the 455KHz IF on 8^)
 >
 > ANYHOO...  Anybody have an "extra" 3.5MHz Xtal, perhaps from a
 parts unit?
 > How much do you need for it shipped to California (95348)?
 >
 > 73 de Phil, KO6BB
 > DX begins at the noise floor!
 > [email protected]
 > Merced, California
 > 37.18N  120.29W  CM97sh
 >
 >
 >
 > avast! (VPS 5/30/2003): the message contains no virus
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