Hi:
Let me second Chuck's comment on the noise. You can NOT have this inside any
living space.
I saw this based on running an HP 117 for some time in the garage but also have
one of the 115BR units.
http://www.prc68.com/I/Images/Rack2bb.jpg
http://www.prc68.com/I/TF_rack.html
PS there are internal momentary switches on the117 multipliers that need to be tweaked to start them so if it totally
stops it takes some effort to get it going again.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.
-------- Original Message --------
I have one of those, only in light gray.
It works quite nicely, though it is obscenely loud!
It has a divider network that takes 100KHz from a
companion reference unit, and divides it down to 1KHz,
that it uses to drive a stepper motor used as a synchronous
motor. The motor drives the mechanical counter mechanism.
Because the motor is being driven with a single phase
1KHz signal, you have to give its shaft a spin to start
it.
There is a little crank driven synchro generator that
is used to insert a phase difference into the 100KHz
reference signal that serves to shift the edge of the
1PPS output.
It is built into a cast aluminum chassis, that is sealed
with O-rings, and even has a humidity monitor to show
the condition of the air in the unit.
The biggest issues I can see with it are the strong
1KHz audio note, the condition of the ball bearings
that support the motor shaft, the little herd of
wet tantalum capacitors in its circuitry, and the
internal nicad pack that keeps it live during short
power failures..
The mechanical counter probably needs some cleaning
and lubrication at this point.
-Chuck Harris
Dave M wrote:
It's Ebay item 351861979923
Dave M
KA2WEU--- via time-nuts wrote:
I can not find the item on EBAY , Ulrich
In a message dated 10/3/2016 11:51:24 A.M. Eastern Daylight Time,
[email protected] writes:
According to my -hp- catalogs it was available only in rack-mount
form, not in a cabinet. That suggests it was being marketed to a
specific small group so it may indeed have been manufactured in
small quantities.
Jeremy
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
