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 pa
That's really cool. A steampunk phase-noise analyzer!
-- john
>
> 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
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
t;phil" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Friday, August 22, 2008 10:15 PM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
>
> - Original Message -
> From: "Magnus Danielson&quo
- Original Message -
From: "Magnus Danielson" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Friday, August 22, 2008 5:25 PM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
> phil wrote:
>> Gent
nd an email to,
[EMAIL PROTECTED]
- Original Message -
From: "Bruce Griffiths" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Friday, August 22, 2008 12:28 AM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
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
ugust 22, 2008 9:20 AM
Subject: 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 capacit
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
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 w
://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:
Sent: Thursday, August 21, 2008 2:07 PM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
"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 rela
y measurement"
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 pro
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
> > thermoswi
e-nuts] 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 i
t;
To: "Discussion of precise time and frequency measurement"
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
>> resolutio
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.
T
AM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard
> 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
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, t
k
> to haunt me.
>
> Best,
>
> Russ
>
>
> -Original Message-
> From: phil <[EMAIL PROTECTED]>
> To: Discussion of precise time and frequency measurement
>
> Sent: Wed, 20 Aug 2008 3:45 am
> Subject: Re: [time-nuts] Restoring GR 1120-AB Frequenc
[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
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 for an intermittent
as
you are describing. Sometimes we overlook the simplest
ROTECTED]>
To: ; <[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 curre
hil
- Original Message -
From: <[EMAIL PROTECTED]>
To:
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.
From: Neville Michie <[EMAIL PROTECTED]>
To: Discussion of precise time and frequency measurement
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 thermo
ussion of precise time and frequency measurement
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 had an old g
://www.maxsmusicplace.com
To subscribe to the fun with tubes group send an email to,
[EMAIL PROTECTED]
- Original Message -
From: <[EMAIL PROTECTED]>
To:
Cc: <[EMAIL PROTECTED]>
Sent: Tuesday, August 19, 2008 4:55 PM
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Sta
ay, August 19, 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 thermometers have formed the basis of a system of
thermostats
used constant temperature systems of very
Hi,
this is a second attempt at an answer, the first seemed to evaporate.
Mercury-in -glass thermometers have formed the basis of a system of
thermostats
used constant temperature systems of very high performance.
A major producer of contact thermometers was Jumo (maybe German).
These thermomete
I suspect the only place you would find a replacement themoswitch is in another
unit. I also doubt that any current mechanical switch will be anywhere near
stable and accurate enough.
I stand by my original comments: Built a solid state functional replacement in
the same form factor as the o
the future.
Best Regards,
Russ
-Original Message-
From: Ed Palmer <[EMAIL PROTECTED]>
To: time-nuts@febo.com
Sent: Tue, 19 Aug 2008 4:00 pm
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard - Need
assist...
Russ,
I don't know what your requirements are
-Original Message-
From: WB6BNQ <[EMAIL PROTECTED]>
To: Discussion of precise time and frequency measurement
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
[
bo.com
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
allow you
to have a working system while you wait for something better to show up.
Ed
> Date: Tue, 19 Aug 2008 11:46:56 -0400
> From: [EMAIL PROTECTED]
> Subject: [time-nuts] Restoring GR 1120-AB Frequency Standard - Need
> assist...
> To: time-nuts@febo.com
> Message-
Russ,
Here is another company that has several models of bi-metal TEMPCO type
switches. Including some very small ones in either a dip (6600 series)
or TO-220 style (6700 series).
[1]http://www.airpax.net/site/sensing/bimetal/index.html
To make Mark happy, if you google various
Russ,
Here is the actual catalog PDF page
[1]http://www.tempco.com/Catalog/Section%2013-pdf/Surface_Mount_Thermos
tats.pdf
Their site sucks for navigation and is very unclear, at first blush, on
how to get to the meat. But I finally did find it. The above link has
all the d
Mark,
I think you missed the point ! He was not necessarily trying to use it
as a frequency standard. He said he was trying to RESTORE it,
including making it work !
BillWB6BNQ
Mark Sims wrote:
The original thermoswitch sounds like is is a mechanical switch, so
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 peopl
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 p
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 Pri
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