[time-nuts] Trimble GPSDO power supply unit./antenna sensing

Brian Kirby kirbybq at bellsouth.net
Fri Sep 12 20:43:40 UTC 2008


You may consider putting a resistor in a coax connector and a tee in the 
antenna circuit, so you may pull a little more current.

You should be able to measure the current with your meter that the 
antenna draws, and then size the resistor to pull the difference you need.

Brian - KD4FM

Ian Sheffield wrote:
> I have noticed on my unit that with one particular active antenna (a small 
> magnetic base unit for vehicles), the flag often cycles between normal and 
> open.
> 
> It could be that some of the newer, smaller antennas use less current that 
> the older ones and the antenna current sensing on the Thunderbolt can't 
> cope.
> 
> ----- Original Message ----- 
> From: <ernieperes at aol.com>
> To: <time-nuts at febo.com>
> Sent: Friday, September 12, 2008 2:41 PM
> Subject: Re: [time-nuts] Trimble GPSDO power supply unit.
> 
> 
>> Gents,
>>
>> Sorry if my mail give the impression that I am complaining about the
>> blown PSU, it is because my English is not as good as it should be.....
>> just wanted some help to repair the unit.....and in the mean time I
>> have already installed the GPSDO into a nice small box with a home
>> built PSU and now looks like a table-top "Frequency Standard" instrument
>>
>> NEW SUBJECT...
>>
>> When I use the GPSDO direct from an active antenna after power
>> interruption the unit recover relative soon,.....
>> but when the GPSDO used from a antenna distribution box and this way
>> the GPSDO sensing the antenna is OPEN, then after power interruption
>> the unit can not recover.......???????----------even after a long
>> period......
>> Anybody had the same experience??????????
>>
>>
>> Thanks and regards,
>> Ernie.
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: David Ackrill <dave.g0dja at tiscali.co.uk>
>> To: Discussion of precise time and frequency measurement
>> <time-nuts at febo.com>
>> Sent: Fri, 12 Sep 2008 8:55 am
>> Subject: Re: [time-nuts] Trimble GPSDO power suply unit.
>>
>>
>>
>> ernieperes at aol.com wrote:
>>
>>> After connecting all wires to the Trimble plug and made a check if
>> all
>>> voltage is correct and left the PS unit to run
>>> on the table without load/connecting to the GPSDO, about 15min got a
>>> big bang and the Power Supply Unit blow-up.
>> On my unit the PSU was not working when it arrived.
>>
>> The quickest solution, for me, was to go to a local electronics shop
>> and
>> buy a new unit.
>>
>> Dave
>>
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