Hi:
My Nortel unit seems to go into holdover when LH is still reporting one
usable satellite. When doing a survey it would go into holdover below
four because I believe it is doing 3D position samples which would
require four.
On a related note I picked up some 110 pin Z-Pack connectors, that would
fit these units, cheap and I have four extras I don't have any use for
and will offer then here free, one per customer, to the first four
people who send me a private email. If postage is expensive to where
you are from eastern Canada I may ask you to pay for the postage.
Paul.
On 9/20/13 7:22 PM, Bob Camp wrote:
Hi
If the unit is dropping into holdover, something is wrong with the number of
sat's it's seeing. If you have saved a location properly, it will only go into
holdover when it's got zero sats. If it does not believe it's got a proper
location it will drop into holdover when it goes below 4 sats. The number of
sats visible isn't what counts here, it's the number that are locked up, above
the elevation mask, and above the AMU threshold. Set either the elevation or
the AMU to high and you will go in and out of holdover.
Bob
On Sep 20, 2013, at 2:13 PM, quartz55 <quart...@hughes.net> wrote:
I was thinking of keeping a couple of batterys floated across the supply, since
it will run on 24V. I'll have to figure out what I'll need for maybe 2 hours.
Not sure what it's drawing now at 30V, but wouldn't be hard to measure.
Couple more things.
What is the foliage filter and will it work on the Nortel?
I keep seeing my holdover going up but haven't seen any sat drop out or yellow
light on the front. Is there any way to re-set the holdover without turning
the unit off? It's up to 468 now, not sure where it started the other day but
probably in the 200's. I may be dreaming too.
I've dropped the idea about choke ring or ground planes after reading what I
could about it. I may try building my own turnstile antenna (ala K7KKQ) and
amp just for fun. Amps are cheap from Mouser and have less than 2 dB NF unlike
mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel
antenna but it may be hard to make.
Dave
----- Original Message -----
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Subject: Re: [time-nuts] New NTBW50AA
Dave wrote:
We have plenty outages here, so I may look into a UPS of some sort
but I have a rather large generator that I always turn on after
about 1/2 hour or so.
The UPS is to keep master oscillators (and for some of us, ovenized
voltage standards) running uninterrupted from the time of the failure
until the generator is running. Best practice is to use a "double
conversion" UPS to avoid even a short outage as it kicks in.
Best regards,
Charles
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