I've posted some General Radio notes and specifications on their Model
1115-B oscillator, hoping there might be some relevance to the Model 1120.
Product specific information starts on page 8.
http://www.ni6e.com/genrad/
Regards,
Peter
NI6E
Max Robinson wrote:
There must have been several
@febo.com
Sent: Sat, 23 Aug 2008 6:47 pm
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
I've posted some General Radio notes and specifications on their Model
1115-B oscillator, hoping there might be some relevance to the Model
1120.
Product specific information starts on page
Bruce Griffiths [EMAIL PROTECTED] wrote:
Max
A capacitance bridge using a transformer would be a lot more
stable than merely using the capacitance to vary the frequency of
an LC oscillator.
The advantage of a capacitive sensing technique over a light beam
is that
: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Bruce Griffiths [EMAIL PROTECTED] wrote:
Max
A capacitance bridge using a transformer would be a lot more
stable than merely using the capacitance to vary the frequency of
an LC oscillator.
The advantage
phil wrote:
Gentlemen,
Original poster is trying to RESTORE this entire old General Radio
Standard ( a rack of equipment) to it's original glory.
He simply needs a part, a unique thermoswitch or a way to fix it, not
retrofit an atomic engine! This is a museum class instrument, 100kc.
May
an email to,
[EMAIL PROTECTED]
- Original Message -
From: Bruce Griffiths [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, August 22, 2008 12:28 AM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Max
- Original Message -
From: Magnus Danielson [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, August 22, 2008 5:25 PM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
phil wrote:
Gentlemen,
Original poster
]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, August 22, 2008 10:15 PM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
- Original Message -
From: Magnus Danielson [EMAIL PROTECTED]
To: Discussion of precise time and frequency
Mike Monett wrote:
[EMAIL PROTECTED] wrote:
Phil,
I didn't believe that the thermoswitch was the problem, at first,
chiefly because of the simplicity of operation. Eventually, after
checking wiring, a carbon resistor that is in series with the
thermoswitch, and
@febo.com
Sent: Thursday, August 21, 2008 12:00 PM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Mike Monett wrote:
[EMAIL PROTECTED] wrote:
Phil,
I didn't believe that the thermoswitch was the problem, at first,
chiefly because of the simplicity of operation
Max Robinson [EMAIL PROTECTED] wrote:
When I was at the university I saw and worked on a thermostatic switch that
used a standard mercury thermometer. The little thing that clipped on to
the thermometer was the capacitor in an oscillator. The detector for
opening and closing the relay was a
://www.maxsmusicplace.com
To subscribe to the fun with tubes group send an email to,
[EMAIL PROTECTED]
- Original Message -
From: Mike Monett [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Thursday, August 21, 2008 2:07 PM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Max
Max
A capacitance bridge using a transformer would be a lot more stable than merely
using the capacitance to vary the frequency of an LC oscillator.
The advantage of a capacitive sensing technique over a light beam is that it
has much simpler and potentially more stable mechanical system than
of precise time and frequency measurement
time-nuts@febo.com
Sent: Tue, 19 Aug 2008 9:33 pm
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Neville,
good answer. Perhaps the original poster could supply a photo of his
switch,
perhaps more suggestions could be made. I think we
: Neville Michie [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tue, 19 Aug 2008 7:46 pm
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Hi,
this is a second attempt at an answer, the first seemed to evaporate.
Mercury-in -glass
Message -
From: [EMAIL PROTECTED]
To: time-nuts@febo.com
Cc: [EMAIL PROTECTED]
Sent: Wednesday, August 20, 2008 2:34 AM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Phil,
The details of the thermoswitch failure are not completely clear.
Intermittently, the mercury
]
To: time-nuts@febo.com; [EMAIL PROTECTED]
Sent: Wednesday, August 20, 2008 3:26 AM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Russ,
In other words, you sound like you are not 100% sure it's the switch. A
shame you couldn't graph voltage and current going to the switch
Aug 2008 3:45 am
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Russ,
Also could it be a cold solder joint on the tubes connections, possibly
look
good but have a high resistance. That could account for an intermittent
as
you are describing. Sometimes we overlook the simplest
[EMAIL PROTECTED] wrote:
Phil,
I didn't believe that the thermoswitch was the problem, at first,
chiefly because of the simplicity of operation. Eventually, after
checking wiring, a carbon resistor that is in series with the
thermoswitch, and components around the
time and frequency measurement
time-nuts@febo.com
Sent: Wed, 20 Aug 2008 3:45 am
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
Russ,
Also could it be a cold solder joint on the tubes connections, possibly
look
good but have a high resistance. That could account
phil wrote:
Russ
Do you have a photo, would it be possible to build? I have a few flasks of
mercury and a few 10's of thousands of mercury wetted relays that some could
be cannibalized for electrodes. The trick here is how thin is that column of
mercury. My guess the thinner the column, the
phil wrote:
Bruce, what was the diameter or how was the column situated to give those
resolutions.
Phil
The thermoregulator consisted of a horizontal ring tube filled with
toluene connected to a 13 long J -tube filled with mercury and
containing a capillary section at the top.
The top
of precise time and frequency measurement
time-nuts@febo.com
Sent: Wednesday, August 20, 2008 7:05 AM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
phil wrote:
Bruce, what was the diameter or how was the column situated to give those
resolutions.
Phil
The thermoregulator
] Restoring GR 1120-AB Frequency Standard
[EMAIL PROTECTED] wrote:
Phil,
I didn't believe that the thermoswitch was the problem, at first,
chiefly because of the simplicity of operation. Eventually, after
checking wiring, a carbon resistor that is in series with the
thermoswitch
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
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
Sent: Tue, 19 Aug 2008 1:54 pm
Subject: [time-nuts] Restoring GR 1120-AB Frequency Standard - Need
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
-Original Message-
From: WB6BNQ [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tue, 19 Aug 2008 2:06 pm
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard -
Needassist...
Russ,
Here is the actual catalog PDF page
[1]http
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