10 Jul
2004
10 Jul
'04
12:46 p.m.
I know this a long shot but is anyone here familar with this radio
reciever? (It is NOT your run of the mill reciever!)
Joe
10 Jul
10 Jul
7:39 p.m.
Hi,
"Joe R." <rigdonj(a)cfl.rr.com> said:
I know this a long shot but is anyone here familar
with this radio
reciever? (It is NOT your run of the mill reciever!)
The only info I have is a short spec. in Janes Military Communications...
you probably know all that info already.
This is definitely not a run-of-the-mill job!
IEE-488 interface, so it's sort of on topic :-)
--
Cheers,
Stan Barr stanb(a)dial.pipex.com
The future was never like this!
11 Jul
11 Jul
12:19 a.m.
At 08:39 AM 7/11/04 +0100, you wrote:
Hi,
"Joe R." <rigdonj(a)cfl.rr.com> said:
Actaully I haven't seen that. Is it posted anywhere or can you scan it
and send it to me?
Joe
I know this a long shot but is anyone here
familar with this radio
reciever? (It is NOT your run of the mill reciever!)
The only info I have is a short spec. in Janes Military Communications... you probably know all that info already.
This is definitely not a run-of-the-mill job!
IEE-488 interface, so it's sort of on topic :-)
--
Cheers,
Stan Barr stanb(a)dial.pipex.com
The future was never like this!
1:06 a.m.
Hi,
"Joe R." <rigdonj(a)cfl.rr.com> said:
At 08:39 AM 7/11/04 +0100, you wrote:
I doubt it's online anywhere - they charge about $600 for the book!
I don't have a scanner either (yet!) but the entry is so short* I can type
it in and email it to you - no problem. I'll do that mow.
* And not very helpful...
--
Cheers,
Stan Barr stanb(a)dial.pipex.com
The future was never like this!
Hi,
"Joe R." <rigdonj(a)cfl.rr.com> said:
Actaully I haven't seen that. Is it posted anywhere or can you scan it
and send it to me? I know this a long shot but is anyone here
familar with this radio
reciever? (It is NOT your run of the mill reciever!)
The only info I have is a short spec. in Janes Military Communications...
2:13 a.m.
Thanks Stan.
Joe
At 02:06 PM 7/11/04 +0100, you wrote:
Hi,
"Joe R." <rigdonj(a)cfl.rr.com> said:
At 08:39 AM 7/11/04 +0100, you wrote:
I doubt it's online anywhere - they charge about $600 for the book!
I don't have a scanner either (yet!) but the entry is so short* I can type
it in and email it to you - no problem. I'll do that mow.
* And not very helpful...
--
Cheers,
Stan Barr stanb(a)dial.pipex.com
The future was never like this!
Hi,
"Joe R." <rigdonj(a)cfl.rr.com> said:
Actaully I haven't seen that. Is it posted anywhere or can you scan it
and send it to me? I know this a long shot but is anyone here
familar with this radio
reciever? (It is NOT your run of the mill reciever!)
The only info I have is a short spec. in Janes Military Communications... 
12 Jul
12 Jul
1:44 a.m.
New subject: Dynamic Sciences R-1250 Reciever info?
http://www.telford-electronics.com/receivers.htm
Above have receiver for sale for ?900.
May be they have info as well ?
Geoff.
----- Original Message -----
From: "Joe R." <rigdonj(a)cfl.rr.com>
To: <cctalk(a)classiccmp.org>
Sent: Sunday, July 11, 2004 1:46 AM
Subject: OT: Dynamic Sciences R-1250 Reciever info?
I know this a long shot but is anyone here familar
with this radio
reciever? (It is NOT your run of the mill reciever!)
Joe
9:42 a.m.
New subject: Dynamic Sciences R-1250 Reciever info?
Thanks Geoff. I've already e-mailed them and asked for information.
Joe
At 02:44 PM 7/12/04 +0100, you wrote:
http://www.telford-electronics.com/receivers.htm
Above have receiver for sale for ?900.
May be they have info as well ?
Geoff.
----- Original Message -----
From: "Joe R." <rigdonj(a)cfl.rr.com>
To: <cctalk(a)classiccmp.org>
Sent: Sunday, July 11, 2004 1:46 AM
Subject: OT: Dynamic Sciences R-1250 Reciever info?
I know this a long shot but is anyone here
familar with this radio
reciever? (It is NOT your run of the mill reciever!)
Joe
1:50 a.m.
New subject: Dynamic Sciences R-1250 Reciever info?
Also webferret search engine tells me there is a reference to receiver on
this page :
http://www.hri.org/cgi-bin/2ascii?http%3A//cryptome.org/
It's probably buried in one of the references somewhere - couldn't find it
with a cursory examination.
Good luck .
Geoff.
----- Original Message -----
From: "Joe R." <rigdonj(a)cfl.rr.com>
To: <cctalk(a)classiccmp.org>
Sent: Sunday, July 11, 2004 1:46 AM
Subject: OT: Dynamic Sciences R-1250 Reciever info?
I know this a long shot but is anyone here familar
with this radio
reciever? (It is NOT your run of the mill reciever!)
Joe
14 Jul
14 Jul
7:16 a.m.
New subject: Update: Dynamic Sciences R-1250 Reciever info?
I finally got the receiver out today and played with it. It seems to
work well for the most part and the sensativity is great! We picked up WWV
from Colorado at 15MHz with only a key stuck into the
RF Signal In port.
The only real problem that we found was that you can't select
any BandWidth
of 20KHz or below. This thing is FULL of filters and attenuators. I suspect
one the relays or drivers in it is bad and isn't selecting the right filter
below 20Mhz. BTW it has a wirewrap control card in it. I haven't pulled it
out yet but it looks like it might be a Multibus card!
Stan Barr found this and send it to me:
Wide Range Receiver Model R-1250
The Model R-1250 wide range receiver is tunable from 100Hz* to 1GHz using
external control, front panel keyboard or a single tuning knob. It has
continuous frequency coverage and automatic preselection filtering.
The unit has selectable IF bandwidths and AM/FM envelope detectors as
well as a built-in IEE-488 bus to allow interfacing to a computer for
automated sytem operation. It has an 8 digit LED display and the frequency
resolution ranges from 0.1Hz below 250Khz to 100Hz above 20Mhz. The R-1250
requires a power supply of 115/230 volts ac, 50/60Hz single phase, measures
222 x 431 x 533mm and weighs 38Kg. It has a logged MTBF in the field of
greater than 2500 hours.
Manufacturer: Dynamic Sciences, Chatsworth, California.
* That's what it says - 100 Hertz...
I also found that it's supposed to be sensitive enough to pick up a
signal at only 10db above the Johnson noise level! AND I found that the
intermediate-frequency (IF) filters have adjustable bandwidths ranging from
50 Hz to 200 MHz!!!
Does anybody have any idea what the AM Pulse strencher control, AM
Slideback control and Log/Lin control are supposed to do? Or what the
Calibrate In posts are for or what the difference is betweeen the regular
Signal In port and the Low Freq Signal In port is?
I posted posted some pictures at <http://www.classiccmp.org/hp/dyn_sci/>.
Joe
10:02 a.m.
New subject: Update: Dynamic Sciences R-1250 Reciever info?
Yes , 100 Hz capabality for vlf signalling - submarine comms and the
like.....
Er , drool ........
Geoff.
----- Original Message -----
From: "Joe R." <rigdonj(a)cfl.rr.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Cc: <stanb(a)dial.pipex.com>om>; <ghldbrd(a)ccp.com>om>; <greg149(a)earthlink.net>
Sent: Wednesday, July 14, 2004 8:16 PM
Subject: Update: Dynamic Sciences R-1250 Reciever info?
from
I finally got the receiver out today and played
with it. It seems to
work well for the most part and the sensativity is great! We picked up WWV
from Colorado at 15MHz with only a key stuck into the RF Signal In port.
The only real problem that we found was that you can't select any
BandWidth
of 20KHz or below. This thing is FULL of filters and
attenuators. I
suspect
one the relays or drivers in it is bad and isn't
selecting the right
filter
below 20Mhz. BTW it has a wirewrap control card in it.
I haven't pulled it
out yet but it looks like it might be a Multibus card!
Stan Barr found this and send it to me:
>Wide Range Receiver Model R-1250
>
>The Model R-1250 wide range receiver is tunable from 100Hz* to 1GHz using
>external control, front panel keyboard or a single tuning knob. It has
>continuous frequency coverage and automatic preselection filtering.
>The unit has selectable IF bandwidths and AM/FM envelope detectors as
>well as a built-in IEE-488 bus to allow interfacing to a computer for
>automated sytem operation. It has an 8 digit LED display and the
frequency
>resolution ranges from 0.1Hz below 250Khz to 100Hz
above 20Mhz. The
R-1250
>requires a power supply of 115/230 volts ac,
50/60Hz single phase,
measures
222 x 431 x
533mm and weighs 38Kg. It has a logged MTBF in the field of
greater than 2500 hours.
Manufacturer: Dynamic Sciences, Chatsworth, California.
* That's what it says - 100 Hertz...
I also found that it's supposed to be sensitive enough to pick up a
signal at only 10db above the Johnson noise level! AND I found that the
intermediate-frequency (IF) filters have adjustable bandwidths ranging 50 Hz to 200 MHz!!!
Does anybody have any idea what the AM Pulse strencher control, AM
Slideback control and Log/Lin control are supposed to do? Or what the
Calibrate In posts are for or what the difference is betweeen the regular
Signal In port and the Low Freq Signal In port is?
I posted posted some pictures at
<http://www.classiccmp.org/hp/dyn_sci/>.
Joe
7467
days inactive
7471
days old
9 comments
3 participants
participants (3)
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geoffreythomas＠onetel.net.uk -
rigdonj＠cfl.rr.com -
stanb＠dial.pipex.com