I am in the last stage of restoring a 1964 General Radio Frequency
Standard Model 1120-AB.
I'm having trouble getting the inner oven to work propoerly and the
problem has been traced to a defective thermostat in the inner oven.
In checking, the thermostat is a thermoswitch manufactured by
Morris,
You implied that you tested the spare module on the bench.
You must connect the -side of the supply to the case of the module as
well as the pin. (this occurs in the unit by its connection to the
chassis)
If you don't the supply floats and you will only read about 1/2 the
voltage out.
Hello Russ,
Well, depending upon the size requirement of the thermal switch, I
would consider trying to retro-fit. One company that makes such things
is TEMPCO [ [1]http://www.tempco.com ]. They have several different
kinds and even one model that is adjustable. There is a nice
The original thermoswitch sounds like is is a mechanical switch, so it can't
be all that accurate or stable.
I would use something like one of those TO-92 temperature sensor chips. I
would probably use a 8 pin micro with an A/D to read it and drive a reed relay
(or transistor). Analog
Looks like a little OOPS here!
Daun
Sent: Tuesday, August 19, 2008 4:43 PM
Subject: FW: IIMorrow GPS units non-functional since Sunday
Oops
Sent: Tue 8/19/2008 4:10 PM
To: [EMAIL PROTECTED]
Subject: IIMorrow GPS units non-functional since Sunday
So
Tim,
You need to make sure the ion pump current has dropped to 10 on the
meter or else the +18V supply is disabled.
If it is high watch the 18 volt meter position and momentarily remove the
A7 high voltage by pulling out the HV connector.
If the +18 comes up then reconnect the HV and let the
Hello,
I'm new to the high-accuracy timing arena, and I'm looking for good
books or other information on the topic in general, preferably
starting from Ground Zero.
Any ideas?
Thanks,
Dave
___
time-nuts mailing list -- time-nuts@febo.com
To
very typical of the 5062C regulator board. IF run long enough, the PCB can
actually de-laminate or crumble when removed. Run very hot and little
circulation in the honey-comb structure.
Dave
- Original Message -
From: Tim Schulz [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Tuesday,
Sorry for missing enough detail on the original thermoswitch.
The original thermoswitch was a unique design that I have not seen
elsewhere. The Princo thermoswitch was a modified mercury thermometer
with two electrodes installed. When the temperature rises, the column
of mercury comes into
Hi Bill,
The Tempco units look great. My original Google search came up with
similar Fenwal units that are a bit larger sizewise. The size of the
Tempco units appears to be a fit into the space reserved for the
original thermoswitch.
Thanks for the assist!
73
Russ WA3FRP
Hello,
I'm new to the high-accuracy timing arena, and I'm looking for good
books or other information on the topic in general, preferably
starting from Ground Zero.
Any ideas?
Thanks,
Dave
http://www.leapsecond.com/pages/books/
http://www.leapsecond.com/time-nuts.htm
/tvb
Folks,
Thanks for all your advice, not to mention personal emails as well.
After reading the advice here and info on the net elsewhere I've settled on
AVR. As I stated, being a very experienced software developer, C was
important to me and also as I get to grips with the micro controller
You must not be an aviator. try nautical mile. ;-)
Of course you probably are referring to NM. Have to watch out with this
group!
Daun
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Jim Palfreyman
Sent: Tuesday, August 19, 2008 9:01 PM
To:
Jim Palfreyman [EMAIL PROTECTED] wrote:
I'm fascinated by the 320 nm flight.
320 billionths of a metre is quite short distance to use a plane.
I would have walked.
Jim
LOL!
Boats and planes use nautical miles (nm). From wikipedia, one nm is
approximately one minute of latitude along any
14 matches
Mail list logo
