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Motorola Quantar 5MHz Reference Ultra High Stability Oscillator CLN1477A

 

Are the subject modules of any value for HAM use on VHF Analog Quantar repeaters?
?
?
 

Yes, but a $100 eBay GPSDO plugged into a stock Quantar is cheaper and more accurate.?
 

900 Quantars require one (though Mike's correct, a generic GPSDO is cheaper and achieves the same thing)
 

Are you selling???


On Fri, Mar 21, 2025 at 8:22?PM Jeff Acree via <locustpointlight=[email protected]> wrote:
Are the subject modules of any value for HAM use on VHF Analog Quantar repeaters?
?
?
 

Hi Chris,
?
I was thinking about buying one, but it isn't' clear to me now that there would any value added for a VHF station (which is all I have).? It seems like the Quantar instructions manual I have is rather vague on most things so I'm still not sure.? I do have a GPSDO in my repeater lab.? And I have a small rubidium standard I can carry about with me.? Recommendations welcome.
?
Thanks!
Jeff
 

A few more questions on this topic.
?
1. Understanding the High Stability Oscillator module is used mostly (or perhaps exclusively - not sure) with the 900 MHz Quantars.? Are they of any benefit on VHF Quantars.
2. Is the High Stability Oscillator module used for periodic calibration and verification? Or are the station VCOs locked to it at all times when installed?
?
Thanks!
?
 

A Quantar high stability oscillator would allow a VHF repeater to go for a very long time without having to adjust back on frequency. The stock osc in a VHF Quantar is pretty good and should go maybe a couple of years without drifting far enough to worry about. I have a spare high stability osc here and a couple of VHF and several UHF Quantars and would not bother to use it on those. If you already own one it wont hurt to use it but I don't think its worth purchasing at the typical $200 to $250 prices I've seen recently.?
 

Another way to look at it, most of the time your repeater will be much closer to being on frequency than most of your user radios. There will be enough tolerance that no one will know the difference.

Mick - W7CAT

----- Original Message -----
From: "Mike via groups.io"
To: [email protected]
Sent: Saturday, March 22, 2025 08:36:40 PM
Subject: Re: [repeater-builder] Motorola Quantar 5MHz Reference Ultra High Stability Oscillator CLN1477A

A Quantar high stability oscillator would allow a VHF repeater to go
for a very long time without having to adjust back on frequency. The stock osc in a VHF Quantar is pretty good and should go maybe a couple of years without drifting far enough to worry about. I have a spare high stability osc here and a couple of VHF and several UHF Quantars and would not bother to use it on those. If you already own one it wont hurt to use it but I don't think its worth purchasing at the typical $200 to $250 prices I've seen recently.




--
Untitled Document
 

I own a couple of VHF Quantars and no the high stability option is just not worth it...analog UHF, optional ..
UHF P25, it does help...900 it's mandatory!! The Quantars refused to sync up without it.

I have several 900 Quantars I'm deploying and need more HSOs

Chris WB5ITT?

On Sat, Mar 22, 2025, 11:55 AM Jeff Acree via <locustpointlight=[email protected]> wrote:
Hi Chris,
?
I was thinking about buying one, but it isn't' clear to me now that there would any value added for a VHF station (which is all I have).? It seems like the Quantar instructions manual I have is rather vague on most things so I'm still not sure.? I do have a GPSDO in my repeater lab.? And I have a small rubidium standard I can carry about with me.? Recommendations welcome.
?
Thanks!
Jeff
 

Got one cheaper on Ebay, $30. It has been on one of my 900 Quantars for five years, have never had to touch it and my garage will fo from 10?F to 120?F (north Texas)
GeorgeC W2DB

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