But remember why it was used. If there was a failure of one of the modules,
it is necessary to do a hot swap of the defective module. Many of these cell
sites (and simulcast PS sites) have a spec on availability up time and MTBF.
Loss of site time reference counts as the site being down and goes against
your availability record.
For what we use them for, powering down to make the connection does not make
a difference.
Tom
----- Original Message -----
From: "Pete Lancashire" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Sunday, November 16, 2014 3:53 PM
Subject: Re: [time-nuts] KS-24361 "NO GPS"
... LED goes out ... I though so but just wanted to make sure. I've
purchased a 2nd set and will see how that behaves. Also ordered a few
of the DE-15 (if that is the correct way of saying it) connectors. The
short pin concept seems to have not been a great idea.
-pete
On Sun, Nov 16, 2014 at 12:40 PM, Bob Camp <[email protected]> wrote:
Hi
On all my box pairs, the “NO GPS” lights all go out on all boxes once
everything is “GOOD” as you define it. A properly operating pair will
have a STBY light (and only that light) on one box. The other box will
have only the ON light lit.
Based on what I’ve seen. I’d suspect the cable between the two units as
the source of (almost) any problem before I’d dig into the rest of the
system.
Bob
On Nov 16, 2014, at 3:29 PM, Pete Lancashire <[email protected]>
wrote:
Like to confirm
It has been said ...
When you apply power, all the LEDs on the front panel will flash. The
"NO GPS" light will continue flashing until you connect a GPS antenna.
Once it sees a satellite, the light will stop flashing and remain on.
The unit will conduct a self-survey for several hours. Eventually, if
all is well, the Z3812A ("REF 0" on its front panel) will show one
green "ON" light and the Z3811A ("REF 1") will show one yellow "STBY"
light. This means that the Z3812A is actually transmitting its 15MHz
output, and the other one is silently waiting to take over if it
fails.
Is this correct about the "NO GPS" LED ?
Once the survey is over, and the GPS is considered to be "GOOD", should
the yellow NO GPS LED be lit ?
For me after being on for a while the LED for me are
REF 1
NO GPS ON solid - this is the one I'm asking about
Fault OFF
STBY ON
ON OFF
REF 0
NO GPS ON
FAULT OFF
STBY OFF
ON ON
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