[time-nuts] Datum 9390 issues & spectracom 8195a woes

[Didier Juges]

Rob, 

I have 50 feet of RG-6 in excellent condition, which is the same cable I used to test the other antennas. I have thought it may be bad, but there are so few components inside that it is hard to imagine any failure mode other than flat dead, yet it is not dead, just a few dBs short.

Anyhow, I have a Symmetricom antenna driving a Symmetricom active splitter obtained from someone on the list, may have been John A, which works very well, so the Bullet is taking a rest :)

Didier


Rob Kimberley <robkimberley at btinternet.com> wrote:

>Didier,
>
>The 9390s were supplied with Trimble Bullets and were usually very
>sensitive
>as long as you watch cable length/attenuation. 
>It sounds like you Bullet is faulty.
>Rob
>
>-----Original Message-----
>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>Behalf Of Didier Juges
>Sent: 09 June 2013 19:42
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] Datum 9390 issues & spectracom 8195a woes
>
>My own Trimble Bullet, and others as far as I can tell by reading this
>list,
>is not very sensitive in general. I get much better results with a
>Symmetricom than with the Bullet. For that matter, I also see more
>satellites with a cheap mag-mount GPS active antenna than with the
>Bullet.
>It is working, but not well.
>However, if you don't see any satellite with it and it is mounted
>reasonably
>well, it may be broken.
>
>Didier
>
>
>On Sun, Jun 9, 2013 at 12:15 PM, Tammy A Wisdom
><tammy-lists at wiztech.biz>wrote:
>
>> Hi all
>> I have a datum 9390 that will pick up GPS and get the date etc but 
>> will not go into oscillator lock state. Anyone have any suggestions
>on
>this?
>>
>> Next up is the spectracom 8195a I have. Allegedly it was working when
>
>> removed from an American tower site. Sadly it doesn't see any GPS 
>> satellites. I'm guessing when it was removed someone cut the antenna
>coax.
>> It still has 4.5v dc on the antenna port but never sees any
>satellites.
>> This device uses oncore gps module. Does anyone know if a) if I 
>> replace said oncore module will it actually work & b) is there 
>> anything goofy they did with the antennas on these units?  & c) is it
>
>> possible they blew the front end of the oncore?  I'm using a trimble 
>> bullet antenna with both devices
>>
>> That all said. If you have a working 9390 or 819x gps reciever that 
>> you would consider parting with please let me know. I'm trying to put
>
>> together a ntp server for my collocation facility.
>>
>> Thank you
>> Tammy A Wisdom
>>
>>
>> Sent from my iPhone
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Sent from my Motorola Droid Razr 4G LTE wireless tracker while I do other things.