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Old 13th Jan 2020, 5:16 pm   #1
Martin G7MRV
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Default 3.5840MHz HC49 Crystal

Can anyone help me out with a 3.5840MHz crystal in a HC49 or similar can?

Im repairing a Nasa Marine active NAVTEX antenna, and it uses this crystal for the clock of a PIC chip. This chip seems to be used as a local oscillator to drive an MC1496 mixer to convert the 490kHz channel to 518kHz, so I think (depending on how the software works) that I need the exact frequency,


cheers
Martin
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Old 13th Jan 2020, 6:30 pm   #2
dodgy-dxer
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Default Re: 3.5840MHz HC49 Crystal

https://www.ebay.com/itm/ANTIQUE-Qua....c100010.m2109
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Old 13th Jan 2020, 6:31 pm   #3
dodgy-dxer
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Default Re: 3.5840MHz HC49 Crystal

https://www.digikey.com/product-deta...4TS-ND/3663135

also in US though
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Old 13th Jan 2020, 6:35 pm   #4
Martin G7MRV
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Default Re: 3.5840MHz HC49 Crystal

That would cost more than the whole receiver and antenna did!

Ive also no proof that only the crystal is at fault (although it did drop off), so looking ideally for a salvage job
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Old 13th Jan 2020, 10:46 pm   #5
Terry_VK5TM
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Default Re: 3.5840MHz HC49 Crystal

3.58 was used at one time for DTMF circuits, so if you have any of those around, you may be able to get a Xtal off one.
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Old 13th Jan 2020, 11:08 pm   #6
Martin G7MRV
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Default Re: 3.5840MHz HC49 Crystal

Quote:
Originally Posted by Terry_VK5TM View Post
3.58 was used at one time for DTMF circuits, so if you have any of those around, you may be able to get a Xtal off one.
I might have an old dialer keypad somewhere, I suppose it would be worth a try if I can find it
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Old 13th Jan 2020, 11:58 pm   #7
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Default Re: 3.5840MHz HC49 Crystal

Can you use a 3.579 and stuff some inductance or capacitance in series to push/pull it into place (can never remember which does which)? Those are commonly available for pennies. Only needs 5KHz nudge.
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