to me before. A very odd year weather-wise!
>
>
>
> Dave
> - Original Message -
> From: k6...@comcast.net
> To: time-nuts@febo.com
> Sent: Thursday, September 16, 2010 8:07:19 AM
> Subject: Re: [time-nuts] LPRO101 orientation vs lock
>
> I assum
and/or lock issues.
>
>
>
> Re the sun in our valley... not this year! My tomatoes just started really
> producing and my squash and zucchini still haven't even flowered. That has
> NEVER happened to me before. A very odd year weather-wise!
>
>
>
> Dave
> ----
d.sei...@comcast.net
Sender: time-nuts-boun...@febo.com
Date: Thu, 16 Sep 2010 19:57:09
To: Discussion of precise time and frequency measurement
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] LPRO101 orientation vs lock
Hi Bob-
I don't have the
x27;t even flowered. That has
NEVER happened to me before. A very odd year weather-wise!
Dave
- Original Message -
From: k6...@comcast.net
To: time-nuts@febo.com
Sent: Thursday, September 16, 2010 8:07:19 AM
Subject: Re: [time-nuts] LPRO101 orientation vs lock
I assume you mean
If you find a good source for the prototype kits, by all means, let me
know. I've been gutting cheap/dead modules for the enclosures. A
project I've been considering is putting a T'bolt into one just to
send 1pps and 10mhz down the backplane.
BTW, there is a yahoo group for TM500/5000 series gear.
Aha! Once again, Google is your friend --
http://www.slack.com/images/TE/EfratomPTB-100.jpg
shows the Efratom Rubidium module, and it's a double-width unit. That gives
plenty of room to mount the module horizontally, and plenty of room above and
below for fins and fans.
When I get my time m
I assume you mean Tektronix TM5xx or 5xxx modules.
I haven't seen an LPRO plugin, but considered doing one for my TM506 rack. My
conclusion was that I couldn't get rid of enough heat without cutting custom
fins for the LPRO.
Recall that the physics package in the LPRO is the biggest source of
Hi
First thing would be a touch test on the heat sink. It should be warm, but not
to hot to touch. Heat sink down should be hotter than vertical. That assumes
there's no moving air.
Next, start watching the VCXO voltage. Normal readings are around 5 to 7 volts.
I'd bet you are running closer t
d.seiter-"...Both then and now, it takes about 45 seconds to lock from cold,
and will stay locked for about 45 minutes"
++
I'm surprised that it locks in 45 seconds, I would expect it to take about 3-4
minutes. All the units I have lock in 3-5 minutes if t
Hi,
there are two obvious causes of lost lock,
wandering off beyond the range of the voltage controlled crystal
local oscillator, not an OXCO, which is swept through the atomic
response frequency,
and the failure of the rubidium lamp at the end of its life.
The oscillator sweeping voltage (pi
I got one of the ebay LPRO-101s about 6 months ago and played with it for a
while, but had problems maintaining a lock. First of all, it has a heat sink
bolted to the bottom that is just a little larger than the LPRO itself,
including being about 1.25" thick( 1" fins). Typical frequency when loc
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