[time-nuts] thunderbolt fault

[Bob Camp]

Hi

Has anybody actually measured the supply sensitivity on the -12 volt line to see weather a 5 volt change makes any noticeable difference in the output frequency? The power on -12 is very low, so there should be negligible thermal impact from a change.

Bob


On Feb 26, 2010, at 4:52 PM, George Dubovsky wrote:

> The -12 can be anything from -7 to -12V and it will work. The units that
> were removed from Grayson or Andrew equipment had a zener diode changed on
> the Thunderbolt (by Trimble) that kept the power alarm from being invoked at
> low values of this voltage.
> 
> 73,
> 
> geo - n4ua
> 
> On Fri, Feb 26, 2010 at 4:47 PM, francesco messineo <
> francesco.messineo at gmail.com> wrote:
> 
>> Hi Stan,
>> 
>> On 2/26/10, Stan, W1LE <stanw1le at verizon.net> wrote:
>>> Hello Francesco,
>>> 
>>> After connecting to a known good power supply, active antenna, and
>>> computer,
>>> give it a chance to warm up and stabilize.
>>> 
>>> After warm up, I get:
>>> +5VDC @ 0.250 A
>>> +12VDC @ 0.12 A
>>> -9VDC @ very low current, just barely moving the meter...
>> 
>> 
>> it's actually +5V,+12 and -12V.
>> Are there different versions? Mine works fine with these voltages,
>> seen the requirement on the manual.
>> However it completed the self survey two times and I set the save
>> position flag. As I said I have one unit working fine, so I know what
>> to expect from it. Each time the power goes off, it is reset to all
>> defaults and eeprom is reported corrupted.
>> I'll try an hard reset however.
>> 
>> Thanks
>> Francesco IZ8DWF
>> 
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