Crystal Identification

The General forum is where users can discuss any topic regarding Motorola communications equipment - hardware, software, etc. There are also several focused forums on this board, so please take the time to ensure that your questions doesn't fall into one of those categories before posting here!

Moderator: Queue Moderator

Post Reply
User avatar
NSPD
Posts: 1626
Joined: Sun Aug 04, 2002 4:52 pm
What radios do you own?: Motorola FR50!

Crystal Identification

Post by NSPD »

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.


Image
Jake
User avatar
abbylind
Posts: 527
Joined: Mon Nov 05, 2001 4:00 pm
What radios do you own?: What dont I own?

Re: Crystal Identification

Post by abbylind »

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
User avatar
NSPD
Posts: 1626
Joined: Sun Aug 04, 2002 4:52 pm
What radios do you own?: Motorola FR50!

Re: Crystal Identification

Post by NSPD »

The only markings are:

R43.00
HHK6G

And

T43.00
HHK7K
JAPAN
Jake
User avatar
abbylind
Posts: 527
Joined: Mon Nov 05, 2001 4:00 pm
What radios do you own?: What dont I own?

Re: Crystal Identification

Post by abbylind »

No joy sir sorry,,,,,
User avatar
abbylind
Posts: 527
Joined: Mon Nov 05, 2001 4:00 pm
What radios do you own?: What dont I own?

Re: Crystal Identification

Post by abbylind »

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

sales@bomarcrystal.com
Good luck
User avatar
NSPD
Posts: 1626
Joined: Sun Aug 04, 2002 4:52 pm
What radios do you own?: Motorola FR50!

Re: Crystal Identification

Post by NSPD »

Thanks Fowler.. I think we are leaning toward them being Midland.
Jake
User avatar
fineshot1
Posts: 1125
Joined: Wed Oct 12, 2005 5:13 am

Re: Crystal Identification

Post by fineshot1 »

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
User avatar
NSPD
Posts: 1626
Joined: Sun Aug 04, 2002 4:52 pm
What radios do you own?: Motorola FR50!

Re: Crystal Identification

Post by NSPD »

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
Posts: 868
Joined: Sun Nov 25, 2001 4:00 pm
What radios do you own?: Too many

Re: Crystal Identification

Post by PETNRDX »

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.
User avatar
NSPD
Posts: 1626
Joined: Sun Aug 04, 2002 4:52 pm
What radios do you own?: Motorola FR50!

Re: Crystal Identification

Post by NSPD »

Great info, thanks!
Jake
Post Reply

Return to “General Motorola Solutions & Legacy Radio Discussion”