[time-nuts] thunderbolt fault
n4ua.va at gmail.com
Fri Feb 26 21:52:35 UTC 2010
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.
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.
> Francesco IZ8DWF
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