Hi Brian;
There are a few decent rubidium oscillators short term like the SRS but none
are great, in my humble opinion you are much better off disciplining a good
quartz oscillator off your LPRO.
Best Wishes;
Thomas Knox
From: wa1...@att.net
Date: Sat, 11 Aug 2012 21:56:13 -0700
To:
On 08/12/2012 05:02 AM, WarrenS wrote:
The basic problem is that one can not meet Allan's requirement
of the integral of the instantaneous frequencies over tau0 time
and Nyquist-Shannon sampling theorem requirement if taking just
one raw phase sample per displayed ADEV tau0.
The two
Hi Grant --
Welcome!
I'd say you're doing OK; most frequency standards don't put a lot of emphasis
on harmonic purity in the specs. Better than 45dB down is pretty good, and not
much TF gear is highly sensitive to harmonics.
I would *not* add a bandpass filter unless you really need to.
Thanks Tom.
I agree, the SRS seems to be the best
overall Rb except maybe on old HP if one is willing to spend about the same
price on a 20 year old unit. The SRS units I bought for work were only $2700
with chassis, rack ears and multiple outputs.
-Brian, WA1ZMS
On Aug 12, 2012, at 3:17
In the commercial world a PRS10 is most likely the best but for time nuts
even at the surplus price in my opinion it is all hype and a waste of
money. Have you looked closely at the specification and the design. Frequency
accuracy can not be better than 1 E-12 since the OCXO is driven
pete, thank you for your advice. unfortunately i did not get much help
there. the problem with the clock seems to be more complex than i thought.
hans
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Bert:
Interesting.
I, too, have a couple of the HP 10811 oven-oscillators sitting on the shelf for
several years, waiting for a project. I want to 'discipline' them, but
really do not know how.
Could you kindly mark up the HP 10811 schematic and/or please tell me what to
cut, ... what to
Me too, please.
-Brian, WA1ZMS
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of dlewis6...@austin.rr.com
Sent: Sunday, August 12, 2012 2:55 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FRK
Hi Don,
Bert:
Interesting.
I, too, have a couple of the HP 10811 oven-oscillators sitting on the
shelf for several years, waiting for a project. I want to 'discipline'
them, but really do not know how.
Also look at John's modification of a Thunderbolt.
I came across this Python module and thought some here might find it
of interest.
http://apenwarr.ca/log/?m=201208#10
Joe Gray
W5JG
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Grant wrote:
I tamed the provided switching power supply noise with some L's and
C's, and am now looking at the 10MHz output on a spectrum analyzer.
Here is what I measured:
10MHz +9dbm
20MHz-50dbm
30MHz -37dbm
no obvious higher harmonics
broad noise envelope at 60 75MHz @ -60dbm
10MHz +9dbm
20MHz-50dbm
30MHz -37dbm
no obvious higher harmonics
broad noise envelope at 60 75MHz @ -60dbm peak
Are these results typical or might I have an adjustment or other problem?
I seem to have missed the part where it's explained why anyone cares about
the harmonic
On 08/13/2012 01:24 AM, John Miles wrote:
10MHz +9dbm
20MHz-50dbm
30MHz -37dbm
no obvious higher harmonics
broad noise envelope at 60 75MHz @ -60dbm peak
Are these results typical or might I have an adjustment or other problem?
I seem to have missed the part where it's explained why
john wrote:
Or they [line harmonics] were cancelled by running the TBolt and
spectrum analyzer from the same AC circuit. That's tripped me up before.
Good thought, although probably not the case here. The Tbolt is
supplied from a double conversion UPS with an output that is not
referred
I'm not familiar with the 59309A, but here are some things to try:
Are you able to read just one character (1A)?
Does the 59309A need a command to send the time?
Have you tried setting the 59309A to talk-only mode?
On 8/2/2012 2:20 PM, Hans Holzach wrote:
RESET HPIL
RESTORE IO
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