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
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
-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@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
Hi Group,
I'm a newbiew and just bought a Lucent RFG-RB rubidium source on Ebay from a
reliable seller. I am observing a daily variability of about 80Hz and
hourly variability of a few Hz with a calibrated HP 5334B counter (with oven
oscillator option). The counter and rubidium source have been
Jerry,
80 Hz is much more than either device should exhibit. There is something
seriously wrong, and if you have a short wave receiver that can receive
WWV at 10 MHz (AM is fine), you should try to listen to the beat
frequency between WWV and either oscillator. That will tell you which is
Jerry,
Is this variability more likely due to the rubidium source (failing bulb) or
due to problems with the 5334B counter?
Obviously you need a third source for comparison while locking
your counter to the Rb source.
I gather from the web that the Lucent unit uses an Efratom
module in
Jerry,
Do you have a heat sink mounted to the Rb source ? It sounds, possibly, like a
heater not reaching equilibrium.
Didier's suggestion of comparing against WWV would be a good start to find who
is
at fault. Your counter time base may have an unknown problem.
BillWB6BNQ
Didier Juges
