Yes , 100 Hz capabality for vlf signalling - submarine comms and the
like.....
Er , drool ........
Geoff.
----- Original Message -----
From: "Joe R." <rigdonj_at_cfl.rr.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk_at_classiccmp.org>
Cc: <stanb_at_dial.pipex.com>; <ghldbrd_at_ccp.com>; <greg149_at_earthlink.net>
Sent: Wednesday, July 14, 2004 8:16 PM
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
Received on Wed Jul 14 2004 - 17:02:11 BST