with a Neg supply less than -3 volts, It
may of been able to go even lower, I just wanted to insure it was reliable
with -5 volts for my application.
**
[time-nuts] Thunderbolt no usable sats.
Arthur Dent golgarfrincham at yahoo.com
It may or may not be used for tuning voltage
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
the -12 VDC is also used by the OCXO as tuning voltage! Bert Kehren
In a message dated 6/12/2011 6:05:01 A.M. Eastern Daylight Time,
golgarfrinc...@yahoo.com writes:
I bougth an Thunderbolt off E-bay some time ago, to use as
reference for my spectrum analyzer and signal generators.
I
Arthur Dent-The -12 VDC is used for the RS-232 so if that
was giving you the problem you wouldn't see anything on your
com port (note it will work at -7 VDC or so)...
the -12 VDC is also used by the OCXO as tuning voltage! Bert Kehren
It may or may not be used for tuning voltage but
The -12V is almost certainly used for deriving the tuning voltage. The unit
can generate a tuning voltage of -5V to +5V. To do this it needs a negative
supply... and there does not seem to be an on board bias generator for
generating the negative DAC supply. Becuase of this, for best
Thank you Mark. It is not almost certain it is a fact.
Bert
-Original Message-
From: Mark Sims hol...@hotmail.com
To: time-nuts@febo.com
Sent: Sun, Jun 12, 2011 10:04 am
Subject: [time-nuts] Thunderbolt no usable sats.
The -12V is almost certainly used for deriving
It may or may not be used for tuning voltage but what I said is
100% correct. The Andrew/Grayson units these T-Bolts were
used in provided -7 VDC for this negative supply and the same
T-Bolts work properly on -12 VDC. If this voltage is missing, the
com port will not work.
+++
Please
] Thunderbolt no usable sats.
Arthur Dent golgarfrincham at yahoo.com
It may or may not be used for tuning voltage but what I said is
100% correct. The Andrew/Grayson units these T-Bolts were
used in provided -7 VDC for this negative supply and the same
T-Bolts work properly on -12 VDC. If this voltage
.
**
[time-nuts] Thunderbolt no usable sats.
Arthur Dent golgarfrincham at yahoo.com
It may or may not be used for tuning voltage but what I said is
100% correct. The Andrew/Grayson units these T-Bolts were
used in provided -7 VDC for this negative supply and the same
T-Bolts work properly on -12
WarrenS-.As long as the Dac out (OSC EFC input) is than a
couple of volts above the neg supply (or the EFC is positive) all
worked fine at any Neg supply down to -3 volts.
This is because most RS232 receivers don't need their input to swing
negative.
Your -7 volts statement agrees well
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
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
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