Mine insists on determining a negative altitude. sometimes it's called
a good position, sometimes not. Eventually, it becomes 'good" even with
-altitude!
Now I understand why it goes in and out of holdover, but what about the
bad altitude??
Jim
wb4...@amsat.org
On 9/20/2013 6:22 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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