Empathy List Archives

PS

Perry Sandeen

Fri, Jul 22, 2011 10:48 PM

List,
Someone asked about surplus rubidium stability.

Here are my results.

I had five Lucent Rubidium’s. Three were from RDR in centennial, CO and two were from the Huntsville hamfest.

Before measuring stability, I ran them for a week on the bench.

Using A Lucent GPS and a HP 5370B counter I found all of mine between 200 to 800 pico-seconds above or below 10 Mhz.

BTW one can still get the Lucent units (Rubidium and GPS) for $79 and shipping from RDR. I’m not knocking any other supplier but I feel that the Lucent units have more space for hacking so one could discipline the rubidium first and then apply it to the crystal Osc for better phase noise if needed.

One pays their money and makes their choices.

Regards,

Perrier

List, Someone asked about surplus rubidium stability. Here are my results. I had five Lucent Rubidium’s. Three were from RDR in centennial, CO and two were from the Huntsville hamfest. Before measuring stability, I ran them for a week on the bench. Using A Lucent GPS and a HP 5370B counter I found all of mine between 200 to 800 pico-seconds above or below 10 Mhz. BTW one can still get the Lucent units (Rubidium and GPS) for $79 and shipping from RDR. I’m not knocking any other supplier but I feel that the Lucent units have more space for hacking so one could discipline the rubidium first and then apply it to the crystal Osc for better phase noise if needed. One pays their money and makes their choices. Regards, Perrier

JC

Jose Camara

Fri, Jul 22, 2011 11:39 PM

Perrier:

Can you clarify your results? What do you mean by 200 to 800ps above or below 10MHz?  Is that how much they gained or lost in a one second period (meaning 2 to 8E-10 error)? Or was it error in period measurement (hopefully not, 8E-3 error).

Jose

-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Perry Sandeen
Sent: Friday, July 22, 2011 3:49 PM
To: time-nuts@febo.com
Subject: [time-nuts] Rubidium stability

List,
Someone asked about surplus rubidium stability.

Here are my results.

I had five Lucent Rubidium’s. Three were from RDR in centennial, CO and two were from the Huntsville hamfest.

Before measuring stability, I ran them for a week on the bench.

Using A Lucent GPS and a HP 5370B counter I found all of mine between 200 to 800 pico-seconds above or below 10 Mhz.

BTW one can still get the Lucent units (Rubidium and GPS) for $79 and shipping from RDR. I’m not knocking any other supplier but I feel that the Lucent units have more space for hacking so one could discipline the rubidium first and then apply it to the crystal Osc for better phase noise if needed.

One pays their money and makes their choices.

Regards,

Perrier

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Perrier: Can you clarify your results? What do you mean by 200 to 800ps above or below 10MHz? Is that how much they gained or lost in a one second period (meaning 2 to 8E-10 error)? Or was it error in period measurement (hopefully not, 8E-3 error). Jose -----Original Message----- From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Perry Sandeen Sent: Friday, July 22, 2011 3:49 PM To: time-nuts@febo.com Subject: [time-nuts] Rubidium stability List, Someone asked about surplus rubidium stability. Here are my results. I had five Lucent Rubidium’s. Three were from RDR in centennial, CO and two were from the Huntsville hamfest. Before measuring stability, I ran them for a week on the bench. Using A Lucent GPS and a HP 5370B counter I found all of mine between 200 to 800 pico-seconds above or below 10 Mhz. BTW one can still get the Lucent units (Rubidium and GPS) for $79 and shipping from RDR. I’m not knocking any other supplier but I feel that the Lucent units have more space for hacking so one could discipline the rubidium first and then apply it to the crystal Osc for better phase noise if needed. One pays their money and makes their choices. Regards, Perrier _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

DD

Dr. David Kirkby

Sat, Jul 23, 2011 4:41 PM

On 07/22/11 11:48 PM, Perry Sandeen wrote:

List,
Someone asked about surplus rubidium stability.

It was me.

Here are my results.

I had five Lucent Rubidium’s. Three were from RDR in centennial, CO and two were from the Huntsville hamfest.

Before measuring stability, I ran them for a week on the bench.

Using A Lucent GPS and a HP 5370B counter I found all of mine between 200 to 800 pico-seconds above or below 10 Mhz.

Like someone else, I'm not sure what you mean by ps in this context.

Dave

On 07/22/11 11:48 PM, Perry Sandeen wrote: > > List, > Someone asked about surplus rubidium stability. It was me. > Here are my results. > > I had five Lucent Rubidium’s. Three were from RDR in centennial, CO and two were from the Huntsville hamfest. > > Before measuring stability, I ran them for a week on the bench. > > Using A Lucent GPS and a HP 5370B counter I found all of mine between 200 to 800 pico-seconds above or below 10 Mhz. Like someone else, I'm not sure what you mean by ps in this context. Dave

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Rubidium stability