Chris wrote:
My perpetually drifting 10811 pretty quickly made it to the negative
voltage rail on the control voltage.
Is this an oscillator you just powered up after it had been off for a
long time? The most common versions of the 0811 are specified for
drift of less than 5 x 10e-10 per
I built a GPSDO using my own power supply,
a VE2ZAZ board, a Trimble Resolution T GPS
and a surplus HP 10811 oscillator.
I'm having a bit of trouble with it. I have it set up and
it locks ok and stays in lock so far. But the recommended
long-term integration setting is not working for me.
If you can measure the 10811 frequency as a function of the control
voltage with the 10811 control voltage input disconnected from
everything else, you'll have a curve that will allow you to translate
control voltage changes into frequency drift.
My impression is that the 10811 ageing is
[mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris Howard
Sent: Monday, November 05, 2012 9:49 AM
To: Time Nuts
Subject: [time-nuts] getting a grip on 10811 drift (beginner-ish question)
I built a GPSDO using my own power supply,
a VE2ZAZ board, a Trimble Resolution T GPS
and a surplus HP
Chris:
I doubt that you have test equipment that can directly measure
the hourly aging frequency drift of the HP10811.
To get a handle on what you are dealing with, you need
to use the spec sheet on the HP10811 to calculate
the tuning sensitivity of the HP10811, in Hz per Volts.
(more likely
Chris:
I doubt that you have test equipment that can directly measure
the hourly aging frequency drift of the HP10811.
To get a handle on what you are dealing with, you need
to use the spec sheet on the HP10811 to calculate
the tuning sensitivity of the HP10811, in Hz per Volts.
(more likely
] getting a grip on 10811 drift (beginner-ish question)
Chris Howard chris at elfpen.com
I built a GPSDO using my own power supply,
a VE2ZAZ board, a Trimble Resolution T GPS
and a surplus HP 10811 oscillator.
I'm having a bit of trouble with it. I have it set up and
it locks ok and stays in lock so
[time-nuts] getting a grip on 10811 drift (beginner-ish question)
Chris Howard chris at elfpen.com
I built a GPSDO using my own power supply,
a VE2ZAZ board, a Trimble Resolution T GPS
and a surplus HP 10811 oscillator.
I'm having a bit of trouble with it. I have
On 11/5/2012 3:16 PM, Richard H McCorkle wrote:
The EFC specs on a 10811 are a frequency change of 1 Hz over
a –5v to +5v EFC span or a sensitivity of roughly 1e-8 per volt
(varies widely up to about 3e-8 / volt on some units) so you can
get a ballpark idea of the age rate by looking at
