[Milsurplus] Receiver in Spy plane
Ralph Cameron
ramcam at magma.ca
Sun Nov 3 13:39:48 EST 2019
BODY { font-family:Arial, Helvetica, sans-serif;font-size:12px;
}Most spectrum analyzers have a zero span mode that will demodulate a
specific signal selected from a peak in the spectrum. As Mike Feher
mentioned WJ, Microtel, E sustems and others make specialized
spectrum analyzers which identify spectra of interest. If not done in
real time, it can be recorded for later analysis.
Identifcation of signals is not only the purpose of SIGINT but
jamming of hostile emitters is one purpose of E/W squadrons. A
fighter equipped with radar tracking a victim aircraft will first use
a low rep rate to locate a target and then switch to a higher rep rate
when locking on the victim. If the victim has a RWR (radar warning
receiver) he will attempt to break that lock by emitting signals that
confuse the fighter radar. An exciting interval.
Ralph CameronVE3BBM
On Sun 03/11/19 7:14 AM , milsurplus-request at mailman.qth.net sent:
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Today's Topics:
1. Receiver in spy plane ? (Hubert Miller)
2. Re: Receiver in spy plane ? (Peter Gottlieb)
3. Re: Receiver in spy plane ? (Mike Feher)
4. Smart People: 70-Volt Line to Voice Coil Transformer-
(David Stinson)
----------------------------------------------------------------------
Message: 1
Date: Fri, 1 Nov 2019 03:25:34 +0000
From: Hubert Miller
To: 'Military Surplus Mail List' ,
"nwmre at yahoogroups.com [6]"
Subject: [Milsurplus] Receiver in spy plane ?
Message-ID:
Content-Type: text/plain; charset="us-ascii"
Again triaging paper, I see this in 'Review of International
Broadcasting, No. 122', January 1988:
"I once had a brief chance to play with the receivers in a U-21 [
sic ] electronic - reconnaissance aircraft, while it was parked on
the ground at
the local airport, back when I worked for the Army agency that
managed aircraft parts. You could tune a cursor on a spectrum -
analyzer
display to the peaks of individual signals, get a digital readout of
their frequency, and hear them in your headphones. It was a really fun
way to
bandscan..." ( Will Martin )
So, I ask, what was this receiver ?
thanks-
Hue
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Message: 2
Date: Thu, 31 Oct 2019 23:40:10 -0400
From: Peter Gottlieb
To: milsurplus at mailman.qth.net [10]
Subject: Re: [Milsurplus] Receiver in spy plane ?
Message-ID:
Content-Type: text/plain; charset=windows-1252; format=flowed
I have a couple of MicroTel receivers that can do that.? I don't
think they are
built rugged enough for aircraft use though, but maybe they were
used.
The PR-700B will do 3 kHz to 2 GHz in AM, FM, SSB, CW and wideband
and has an
integral subcarrier receiver as well.? No microprocessor, either,
it's all
digital logic and analog.? Not quite what you say as you can move
the cursor to
a spike but then have to hit buttons to select mode, BW, etc. but
you do get a
frequency readout.? It will run on 28 volts DC as well as AC
115/230.
I'd be curious about other similar receivers.
Peter
On 10/31/2019 11:25 PM, Hubert Miller wrote:
>
> Again triaging paper, I see this in 'Review of International
Broadcasting, No.
> 122', January 1988:
>
> "I once had a brief chance to play with the receivers in a U-21 [
sic ]
> electronic ? reconnaissance aircraft, while it was parked on the
ground at
>
> the local airport, back when I worked for the Army agency that
managed
> aircraft parts. You could tune a cursor on a spectrum ? analyzer
>
> display to the peaks of individual signals, get a digital readout
of their
> frequency, and hear them in your headphones. It was a really fun
way to
>
> bandscan?"? ( Will Martin )
>
> So, I ask, what was this receiver ?
>
> thanks-
>
> Hue
>
>
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------------------------------
Message: 3
Date: Fri, 1 Nov 2019 10:04:12 -0400
From: "Mike Feher"
To: "'Hubert Miller'" , "'Military Surplus Mail
List'" ,
Subject: Re: [Milsurplus] Receiver in spy plane ?
Message-ID:
Content-Type: text/plain; charset="us-ascii"
Hi Hue -
Racal and WJ had receivers that did that. E-Systems also made those
specifically for use in aircraft. 73 - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ 07731
848-245-9115
From: milsurplus-bounces at mailman.qth.net [18]
On Behalf Of Hubert Miller
Sent: Thursday, October 31, 2019 11:26 PM
To: 'Military Surplus Mail List' ;
nwmre at yahoogroups.com [21]
Subject: [Milsurplus] Receiver in spy plane ?
Again triaging paper, I see this in 'Review of International
Broadcasting,
No. 122', January 1988:
"I once had a brief chance to play with the receivers in a U-21 [
sic ]
electronic - reconnaissance aircraft, while it was parked on the
ground at
the local airport, back when I worked for the Army agency that
managed
aircraft parts. You could tune a cursor on a spectrum - analyzer
display to the peaks of individual signals, get a digital readout of
their
frequency, and hear them in your headphones. It was a really fun way
to
bandscan." ( Will Martin )
So, I ask, what was this receiver ?
thanks-
Hue
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Message: 4
Date: Sun, 3 Nov 2019 06:13:57 -0600
From: David Stinson
To: "milsurplus at mailman [23]" ,
"Boatanchors at mailman [25]"
Subject: [Milsurplus] Smart People: 70-Volt Line to Voice Coil
Transformer-
Message-ID:
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Dear Smarter-Than-Me People:
Is there anyone in our community who is expert with 70-Volt-Line
distributed audio?
I ask because I have an application for a larger-than-normal
Line-to-Voice Coil transformer.
It is easily twice the size and of more robust construction than the
ones you commonly see.? It has no maker markings.? Line-side has
four
line selections (unmarked).? Highest DC resistance is 117 Ohms.?
Voice-coil side has three (unmarked) selections, which are likely
4-8-16
Ohms.?? Please see the attached photo.
My question:? The transformer is part of a cathode-modulation test.?
Can
this transformer survive 200 mA current for as much as 5 mins,
assuming
a duty-cycle of 25% or less?? That would mean the windings would
have to
dissipate about 5 Watts as heat during on-cycle.? That don't sound
like
much but it is, especially when dumped into a heat-retaining iron
core.?
I'm doubtful but don't know the capabilities of this transformer.?
Any
insights would be appreciated.
TNX OM ES 73 DE Dave AB5S
--
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