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Crystal Identification

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NSPD
Posts: 1616
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What radios do you own?: Motorola FR50!

Crystal Identification

Postby NSPD » Sun Apr 29, 2018 9:56 am

So I have a quantity of old crystals, I believe these are Motorola. Anyone have any idea what type of radios these would have gone in?

I would like to get a low band PT500, PT400, or GE Porta-Mobil working on 43.04 and 43.00 and I am hoping I may be able to use these.


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Jake

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abbylind
Posts: 520
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What radios do you own?: What dont I own?

Re: Crystal Identification

Postby abbylind » Sun Apr 29, 2018 4:54 pm

Jake
What is the actual freq stamped on the Xtal? Not the 43.000Mhz
May be able to back track the formula using the Xtal freq. Sometimes the Xtal goes into a TCXO

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NSPD
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Re: Crystal Identification

Postby NSPD » Sun Apr 29, 2018 5:24 pm

The only markings are:

R43.00
HHK6G

And

T43.00
HHK7K
JAPAN
Jake

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abbylind
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Re: Crystal Identification

Postby abbylind » Sun Apr 29, 2018 6:09 pm

No joy sir sorry,,,,,

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abbylind
Posts: 520
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Re: Crystal Identification

Postby abbylind » Sun Apr 29, 2018 6:26 pm

You might try Bomar Crystal They might be able to run it down for you sir

sales@bomarcrystal.com
Good luck

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NSPD
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What radios do you own?: Motorola FR50!

Re: Crystal Identification

Postby NSPD » Wed May 02, 2018 4:14 am

Thanks Fowler.. I think we are leaning toward them being Midland.
Jake

fineshot1
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Re: Crystal Identification

Postby fineshot1 » Thu May 03, 2018 5:07 am

Jake - i still have some MT500 low band crystals so let me know
what the crystal freq for 43.04 and 43.00 would be. If I have them
I can let you know.
fineshot1
NJ USA

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NSPD
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What radios do you own?: Motorola FR50!

Re: Crystal Identification

Postby NSPD » Sun May 06, 2018 1:36 am

fineshot1 wrote:Jake - i still have some MT500 low band crystals so let me know
what the crystal freq for 43.04 and 43.00 would be. If I have them
I can let you know.


I have been searching online trying to find a way to determine that.. no luck so far but if I do I’ll give you a shout!
Jake

PETNRDX
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Re: Crystal Identification

Postby PETNRDX » Wed May 09, 2018 1:11 pm

MT 500 crystals won't work in a PT.
PT transmit is carrier divided by 16.
Receive is much more complicated.
For 42 to 54 mhz the first osc crystal freq equals carrier freq MINUS the second osc.
The second oscillator crystal should be 5.245 for 43.00 to 43.16
But the second oscillator crystal should be 6.155 for 43.18 to 49.14.
You will need to find out which 2nd osc crystal you have.
Steve K.

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NSPD
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Re: Crystal Identification

Postby NSPD » Wed May 09, 2018 3:58 pm

Great info, thanks!
Jake


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