More pictures of the mystery Collins Ru
https://plus.google.com/u/0/photos/111617808980322733757/albums/5890266601277045697
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it is
glued in place.
Then when I finally got the lid with all the screws off, all there is, is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple parts
were
replaced and there soft RTV was used. There are two precision resistors in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire pete@petelancashire.comwrote:
https://plus.google.com/u/0/photos/111617808980322733757/albums/5890266601277045697
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it is
glued in place.
Then when I finally got the lid with all the screws off, all there is, is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple parts
were
replaced and there soft RTV was used. There are two precision resistors in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
maybe I should read things more often .. yikes I need a vacation
On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky n4ua.va@gmail.com wrote:
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <pete@petelancashire.com
wrote:
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it is
glued in place.
Then when I finally got the lid with all the screws off, all there is, is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple parts
were
replaced and there soft RTV was used. There are two precision resistors
in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Googling a little bit, I find several references to a Collins rubidium
package AFS-81 for airborne survivable VLF communications in the 60's
(predating this unit by maybe two decades). Still trying to wrap my head
around why that would need rubidium unless it was an airborne WWVB
replacement or something.
Googling also turned up the modern Rockwell-Collins 617A-1 VLF amp which
seems to be a dinky solid state unit that is rated at a third of a
megawatt. Still having a hard time wrapping my mind around that! Maybe I'm
off by 2 or 3 orders of magnitude or the picture is just the control head,
the real amplifier is the size of a building. A third of a megawatt must be
the size of the fixed transmitters used for VLF submarine communications.
Tim N3QE
On Sun, Jul 28, 2013 at 9:40 AM, Pete Lancashire pete@petelancashire.comwrote:
maybe I should read things more often .. yikes I need a vacation
On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky n4ua.va@gmail.com
wrote:
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <
wrote:
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it
is
glued in place.
Then when I finally got the lid with all the screws off, all there is,
is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple
parts
were
replaced and there soft RTV was used. There are two precision resistors
in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Hi Tim,
Three possible reasons for needing a Rb standard,
1/ Coherent detection with a local clock
2/ Hyperbolic navigation (local reference improves the fix and holdover)
3/ Secure communications.
Robert G8RPI
From: Tim Shoppa tshoppa@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sunday, 28 July 2013, 15:25
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
Googling a little bit, I find several references to a Collins rubidium
package AFS-81 for airborne survivable VLF communications in the 60's
(predating this unit by maybe two decades). Still trying to wrap my head
around why that would need rubidium unless it was an airborne WWVB
replacement or something.
Googling also turned up the modern Rockwell-Collins 617A-1 VLF amp which
seems to be a dinky solid state unit that is rated at a third of a
megawatt. Still having a hard time wrapping my mind around that! Maybe I'm
off by 2 or 3 orders of magnitude or the picture is just the control head,
the real amplifier is the size of a building. A third of a megawatt must be
the size of the fixed transmitters used for VLF submarine communications.
Tim N3QE
On Sun, Jul 28, 2013 at 9:40 AM, Pete Lancashire pete@petelancashire.comwrote:
maybe I should read things more often .. yikes I need a vacation
On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky n4ua.va@gmail.com
wrote:
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <
wrote:
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it
is
glued in place.
Then when I finally got the lid with all the screws off, all there is,
is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple
parts
were
replaced and there soft RTV was used. There are two precision resistors
in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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and follow the instructions there.
Hi:
I think (3). See:
http://en.wikipedia.org/wiki/TACAMO
http://en.wikipedia.org/wiki/Ground_Wave_Emergency_Network -> some converted to DGPS
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Robert Atkinson wrote:
Hi Tim,
Three possible reasons for needing a Rb standard,
1/ Coherent detection with a local clock
2/ Hyperbolic navigation (local reference improves the fix and holdover)
3/ Secure communications.
Robert G8RPI
From: Tim Shoppa tshoppa@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sunday, 28 July 2013, 15:25
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
Googling a little bit, I find several references to a Collins rubidium
package AFS-81 for airborne survivable VLF communications in the 60's
(predating this unit by maybe two decades). Still trying to wrap my head
around why that would need rubidium unless it was an airborne WWVB
replacement or something.
Googling also turned up the modern Rockwell-Collins 617A-1 VLF amp which
seems to be a dinky solid state unit that is rated at a third of a
megawatt. Still having a hard time wrapping my mind around that! Maybe I'm
off by 2 or 3 orders of magnitude or the picture is just the control head,
the real amplifier is the size of a building. A third of a megawatt must be
the size of the fixed transmitters used for VLF submarine communications.
Tim N3QE
On Sun, Jul 28, 2013 at 9:40 AM, Pete Lancashire pete@petelancashire.comwrote:
maybe I should read things more often .. yikes I need a vacation
On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky n4ua.va@gmail.com
wrote:
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <
wrote:
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it
is
glued in place.
Then when I finally got the lid with all the screws off, all there is,
is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple
parts
were
replaced and there soft RTV was used. There are two precision resistors
in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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To unsubscribe, go to
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and follow the instructions there.
If they needed an airborne rubidium standard it must have been for digitally
scrambled communications. That has been around since the 60s.
Regards.
Max. K 4 O DS.
Email: max@maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
Vacuum tube site: http://www.funwithtubes.net
Woodworking site
http://www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html
Music site: http://www.maxsmusicplace.com
To subscribe to the fun with transistors group send an email to.
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----- Original Message -----
From: "Tim Shoppa" tshoppa@gmail.com
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Sunday, July 28, 2013 9:25 AM
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
Googling a little bit, I find several references to a Collins rubidium
package AFS-81 for airborne survivable VLF communications in the 60's
(predating this unit by maybe two decades). Still trying to wrap my head
around why that would need rubidium unless it was an airborne WWVB
replacement or something.
Googling also turned up the modern Rockwell-Collins 617A-1 VLF amp which
seems to be a dinky solid state unit that is rated at a third of a
megawatt. Still having a hard time wrapping my mind around that! Maybe I'm
off by 2 or 3 orders of magnitude or the picture is just the control head,
the real amplifier is the size of a building. A third of a megawatt must
be
the size of the fixed transmitters used for VLF submarine communications.
Tim N3QE
On Sun, Jul 28, 2013 at 9:40 AM, Pete Lancashire
pete@petelancashire.comwrote:
maybe I should read things more often .. yikes I need a vacation
On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky n4ua.va@gmail.com
wrote:
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <
wrote:
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam,
it
is
glued in place.
Then when I finally got the lid with all the screws off, all there
is,
is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple
parts
were
replaced and there soft RTV was used. There are two precision
resistors
in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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and follow the instructions there.
A reference to GR and Rubidium
http://www.ieee-uffc.org/frequency-control/memoria-stratemeyer.asp
Did the GR 1115A, Sounds like an interesting person.
On Sat, Jul 27, 2013 at 6:24 PM, Pete Lancashire pete@petelancashire.comwrote:
https://plus.google.com/u/0/photos/111617808980322733757/albums/5890266601277045697
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it is
glued in place.
Then when I finally got the lid with all the screws off, all there is, is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple parts
were
replaced and there soft RTV was used. There are two precision resistors in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
Hi:
The military UHF voice radio scrambling depends on accurate time, hence the Have Quick (and follow on programs) time
transfer standard.
Rb standards were used to maintain that time in the early days.
The O-1814 Rb standard was used to keep time on the ground accurate so that when a plane flew in from far away the
crypto would be in sync.
http://www.prc68.com/I/O1814.shtml
PS has anyone done any PIC Have Quick stuff?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Brooke Clarke wrote:
Hi:
I think (3). See:
http://en.wikipedia.org/wiki/TACAMO
http://en.wikipedia.org/wiki/Ground_Wave_Emergency_Network -> some converted to DGPS
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Robert Atkinson wrote:
Hi Tim,
Three possible reasons for needing a Rb standard,
1/ Coherent detection with a local clock
2/ Hyperbolic navigation (local reference improves the fix and holdover)
3/ Secure communications.
Robert G8RPI
From: Tim Shoppa tshoppa@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sunday, 28 July 2013, 15:25
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
Googling a little bit, I find several references to a Collins rubidium
package AFS-81 for airborne survivable VLF communications in the 60's
(predating this unit by maybe two decades). Still trying to wrap my head
around why that would need rubidium unless it was an airborne WWVB
replacement or something.
Googling also turned up the modern Rockwell-Collins 617A-1 VLF amp which
seems to be a dinky solid state unit that is rated at a third of a
megawatt. Still having a hard time wrapping my mind around that! Maybe I'm
off by 2 or 3 orders of magnitude or the picture is just the control head,
the real amplifier is the size of a building. A third of a megawatt must be
the size of the fixed transmitters used for VLF submarine communications.
Tim N3QE
On Sun, Jul 28, 2013 at 9:40 AM, Pete Lancashire pete@petelancashire.comwrote:
maybe I should read things more often .. yikes I need a vacation
On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky n4ua.va@gmail.com
wrote:
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <
wrote:
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it
is
glued in place.
Then when I finally got the lid with all the screws off, all there is,
is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple
parts
were
replaced and there soft RTV was used. There are two precision resistors
in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Hi
….
There was a suitcase Rb that was used to sync up Have Quick's on the ground. It was a Magnavox product rather than Collins. The idea was to get the radios netted up without anything going over the air. Since the radios used TCXO's, sync was fairly loose. I suspect that tightened up as they went through the various versions ...
Bob
On Jul 28, 2013, at 6:58 PM, Brooke Clarke brooke@pacific.net wrote:
Hi:
The military UHF voice radio scrambling depends on accurate time, hence the Have Quick (and follow on programs) time transfer standard.
Rb standards were used to maintain that time in the early days.
The O-1814 Rb standard was used to keep time on the ground accurate so that when a plane flew in from far away the crypto would be in sync.
http://www.prc68.com/I/O1814.shtml
PS has anyone done any PIC Have Quick stuff?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Brooke Clarke wrote:
Hi:
I think (3). See:
http://en.wikipedia.org/wiki/TACAMO
http://en.wikipedia.org/wiki/Ground_Wave_Emergency_Network -> some converted to DGPS
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Robert Atkinson wrote:
Hi Tim,
Three possible reasons for needing a Rb standard,
1/ Coherent detection with a local clock
2/ Hyperbolic navigation (local reference improves the fix and holdover)
3/ Secure communications.
Robert G8RPI
From: Tim Shoppa tshoppa@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sunday, 28 July 2013, 15:25
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
Googling a little bit, I find several references to a Collins rubidium
package AFS-81 for airborne survivable VLF communications in the 60's
(predating this unit by maybe two decades). Still trying to wrap my head
around why that would need rubidium unless it was an airborne WWVB
replacement or something.
Googling also turned up the modern Rockwell-Collins 617A-1 VLF amp which
seems to be a dinky solid state unit that is rated at a third of a
megawatt. Still having a hard time wrapping my mind around that! Maybe I'm
off by 2 or 3 orders of magnitude or the picture is just the control head,
the real amplifier is the size of a building. A third of a megawatt must be
the size of the fixed transmitters used for VLF submarine communications.
Tim N3QE
On Sun, Jul 28, 2013 at 9:40 AM, Pete Lancashire pete@petelancashire.comwrote:
maybe I should read things more often .. yikes I need a vacation
On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky n4ua.va@gmail.com
wrote:
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <
wrote:
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it
is
glued in place.
Then when I finally got the lid with all the screws off, all there is,
is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple
parts
were
replaced and there soft RTV was used. There are two precision resistors
in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
On Sun, Jul 28, 2013 at 07:54:47PM -0400, Bob Camp wrote:
Hi
….
There was a suitcase Rb that was used to sync up Have Quick's on the ground. It was a Magnavox product rather than Collins. The idea was to get the radios netted up without anything going over the air. Since the radios used TCXO's, sync was fairly loose. I suspect that tightened up as they went through the various versions ...
Bob
On Jul 28, 2013, at 6:58 PM, Brooke Clarke brooke@pacific.net wrote:
Hi:
The military UHF voice radio scrambling depends on accurate time, hence the Have Quick (and follow on programs) time transfer standard.
Rb standards were used to maintain that time in the early days.
A minor quibble - HAVE QUICK is really not meant as a voice
"scrambling system" but an anti-jam ECCM technology. If you hop around
every so often to a frequency that is unpredicatable (chosen by a
cryptographic random sequence) your opponent has to find and follow you
to jam you and do this fast enough to actually cause you problems.
Otherwise he is stuck with barrage jamming the entire band.
Hopping like this does require synchronized clocks... thus
the Rb... in order to hop at the right time to the right place.
There are several current and historic voice encryption systems
that provide strong voice security without hopping - lots of crypto
technology for that. But HAVE QUICK is often used with plain ole in the
clear AM voice and that voice can be reconstructed by having receivers
for each of the hop frequencies that vote on the strongest signal (or
some virtual equivalent of all of this done with FFTs and the like).
Most cryptosystems do not depend on precise time of day,
though some antique ones did...
--
Dave Emery N1PRE/AE, die@dieconsulting.com DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in
celebration of what could have been, but wasn't and is not to be now either."
"PS has anyone done any PIC Have Quick stuff?"
If I told you I'd have to shoot you ;-)
Robert.
From: Brooke Clarke brooke@pacific.net
To: time-nuts@febo.com
Sent: Sunday, 28 July 2013, 23:58
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
Hi:
The military UHF voice radio scrambling depends on accurate time, hence the Have Quick (and follow on programs) time
transfer standard.
Rb standards were used to maintain that time in the early days.
The O-1814 Rb standard was used to keep time on the ground accurate so that when a plane flew in from far away the
crypto would be in sync.
http://www.prc68.com/I/O1814.shtml
PS has anyone done any PIC Have Quick stuff?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Brooke Clarke wrote:
Hi:
I think (3). See:
http://en.wikipedia.org/wiki/TACAMO
http://en.wikipedia.org/wiki/Ground_Wave_Emergency_Network -> some converted to DGPS
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Robert Atkinson wrote:
Hi Tim,
Three possible reasons for needing a Rb standard,
1/ Coherent detection with a local clock
2/ Hyperbolic navigation (local reference improves the fix and holdover)
3/ Secure communications.
Robert G8RPI
From: Tim Shoppa tshoppa@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sunday, 28 July 2013, 15:25
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
Googling a little bit, I find several references to a Collins rubidium
package AFS-81 for airborne survivable VLF communications in the 60's
(predating this unit by maybe two decades). Still trying to wrap my head
around why that would need rubidium unless it was an airborne WWVB
replacement or something.
Googling also turned up the modern Rockwell-Collins 617A-1 VLF amp which
seems to be a dinky solid state unit that is rated at a third of a
megawatt. Still having a hard time wrapping my mind around that! Maybe I'm
off by 2 or 3 orders of magnitude or the picture is just the control head,
the real amplifier is the size of a building. A third of a megawatt must be
the size of the fixed transmitters used for VLF submarine communications.
Tim N3QE
On Sun, Jul 28, 2013 at 9:40 AM, Pete Lancashire pete@petelancashire.comwrote:
maybe I should read things more often .. yikes I need a vacation
On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky n4ua.va@gmail.com
wrote:
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <
wrote:
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam, it
is
glued in place.
Then when I finally got the lid with all the screws off, all there is,
is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple
parts
were
replaced and there soft RTV was used. There are two precision resistors
in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
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Not true,
Many aircraft OMEGA / VLF navigation systems used Rb clocks. Most if not all the FRKs on the surplus market with the 10MHz output on the multipole connector rather than a SMA came from OMEGA / VLF units. I used to fix the systems.
Robert G8RPI.
From: Max Robinson max@maxsmusicplace.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Sunday, 28 July 2013, 23:24
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
If they needed an airborne rubidium standard it must have been for digitally
scrambled communications. That has been around since the 60s.
Regards.
Max. K 4 O DS.
Email: max@maxsmusicplace.com
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----- Original Message -----
From: "Tim Shoppa" tshoppa@gmail.com
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Sunday, July 28, 2013 9:25 AM
Subject: Re: [time-nuts] More pictures of the mystery Collins Ru
Googling a little bit, I find several references to a Collins rubidium
package AFS-81 for airborne survivable VLF communications in the 60's
(predating this unit by maybe two decades). Still trying to wrap my head
around why that would need rubidium unless it was an airborne WWVB
replacement or something.
Googling also turned up the modern Rockwell-Collins 617A-1 VLF amp which
seems to be a dinky solid state unit that is rated at a third of a
megawatt. Still having a hard time wrapping my mind around that! Maybe I'm
off by 2 or 3 orders of magnitude or the picture is just the control head,
the real amplifier is the size of a building. A third of a megawatt must
be
the size of the fixed transmitters used for VLF submarine communications.
Tim N3QE
On Sun, Jul 28, 2013 at 9:40 AM, Pete Lancashire
pete@petelancashire.comwrote:
maybe I should read things more often .. yikes I need a vacation
On Sun, Jul 28, 2013 at 7:01 AM, George Dubovsky n4ua.va@gmail.com
wrote:
Well, the outside label does claim it was made by GENRAD... ;-)
73,
geo - n4ua
On Sat, Jul 27, 2013 at 9:24 PM, Pete Lancashire <
wrote:
The board with the edge connector was inside the same bag the
connector was in, the bag was taped to the unit.
I pulled the ends off first, but was immediately stopped with foam,
it
is
glued in place.
Then when I finally got the lid with all the screws off, all there
is,
is
one board covered in potting compound.
The compound breaks away pretty easily. One can see where a couple
parts
were
replaced and there soft RTV was used. There are two precision
resistors
in
that area.
The biggest surprise is the General Radio logo on the board !
goo.gl/1XGG2F
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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and follow the instructions there.
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To unsubscribe, go to
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