[time-nuts] Thunderbolt no usable sats.

[WB6BNQ]

Hello Thomas,

The first question is did you measure the minus 12 output of your inverter to
make sure it was not being loaded down too far when powering the Thunderbolt ?

If it was working on the original minus 12 volt supply properly, then it would
seem that there is a problem with your inverter.  I would consider hooking up the
original negative supply and measuring the current consumption to see if it is
too high for the inverter circuit.

Bill....WB6BNQ


"Thomas S. Knutsen" wrote:

> I bougth an Thunderbolt off E-bay some time ago, to use as reference
> for my spectrum analyzer and signal generators.
> I had it connected up with a couple of power supplies and it worked as
> it should.
> Today I put together an voltage inverter to get the -12V to the GPS in
> order to use it with an single 12V power supply.
>
> When re-starting the GPS, it did an servey but did not find any usable
> satelites, I did think that it just needed some time, and left it on
> for a couple of hours. It still show no usable sats.
>
> When monitoring the GPS with Lady Heather the clock show an time, but
> it states no usable sats and none are visible in the map.
> The GPS antenna is in the attic and have approx 25dB gain (with cable loss).
>
> Is there any known issues with this? I did look through the archives
> but found nothing.
>
> Is the -12V used for more than the RS-232? if not, would it be
> possible to replace it with an other type that don't ned -12V?
>
> BR
> Thomas.
>
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