[time-nuts] New NTBW50AA

[Bob Camp]

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 <quartz55 at 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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