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Re: [TenTec] Radio Science + QSK = Radar

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Radio Science + QSK = Radar
From: John Nason <jmnason@yahoo.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 3 Jan 2006 08:03:22 -0800 (PST)
List-post: <mailto:tentec@contesting.com>
The Woodpecker, by golly it's been awhile....

--- GARY HUBER <glhuber@msn.com> wrote:

> When the Soviets were running OTHR in the amateur
> bands, (which used the HF echo to "see" targets) I
> used QSK CW dits to synchronize with their OTHR
> pulse timing and jam their "B" scopes. As a former
> Radar Electronics Counter-Measures and Electronics
> Counter-Counter-Measures operator, I knew it was
> simply a matter of transmitting a signal of about
> the same frequency, duration, and slightly stronger
> than their "return" to confuse their operators. By
> setting my keyer speed so that I did not hear their
> pulse while QSK at 100 W and by calling HH5HH with
> the beam pointed at the strongest OTHR signal, I'd
> usually hear them go QRT or find someplace else to
> play. Calling HH5HH QSK at the OTHR pulse rate
> worked well until the Soviets started using digital
> signal processing, then it became a "overload signal
> game" with less apparent success in forcing them to
> QSY or QRT.
> 
> By the way my RADAR set back then was a Ten-Tec
> OMNI-D.... 
> 
> Best regards,
> Gary - AB9M
> CSM(r)G.L.Huber
> glhuber@msn.com<mailto:glhuber@msn.com>
>
gary.huber@us.army.mil<mailto:gary.huber@us.army.mil>
> www.csm-gh.com<http://www.csm-gh.com/>
> 9679 Heron Bay Road
> Bloomington, IL 61704
> (309-662-0604)
> National Webmaster for:
> The Society of the Fifth Division
>
wm@fifthinfantrydivision.com<mailto:wm@fifthinfantrydivision.com>
>
www.societyofthefifthdivision.com<http://www.societyofthefifthdivision.com/>
>   ----- Original Message ----- 
>   From: Martin, AA6E<mailto:martin.ewing@gmail.com> 
>   To:
> tentec@contesting.com<mailto:tentec@contesting.com> 
>   Sent: Monday, January 02, 2006 12:20 PM
>   Subject: [TenTec] Radio Science + QSK = Radar
> 
> 
>   When operating QSK at 15-20 wpm, I am running into
> echoes of my
>   transmissions.  These occur on certain azimuth
> bearings at certain
>   times of day, most often to the SE, which is over
> water until hitting
>   S. Africa or Antarctica from here.  I've seen this
> from 20 M to 15 M,
>   at least.
> 
>   Rarely, I think I've seen long-path echoes that
> come back to me from
>   the opposite azimuth. (The SteppIR bidirectional
> mode picks them up.) 
>   More often, the return bearing is the same as
> transmitting.  I haven't
>   been able to measure the delay time accurately,
> but it is roughly 2
>   dit (element) times at 25 wpm (about 50 msec),
> indicating a 10,000
>   mile roundtrip.
> 
>   It seems to be a real effect.  I can get rid of it
> by changing azimuth
>   or using a dummy load.
> 
>   My question is whether other ops see this and
> whether it has been
>   written up anywhere in "ham space".  These are not
> the "long delay
>   echoes" that people have claimed to see.  The
> radio science community
>   does run HF radar to study fluctuations in the
> ionosphere, and this
>   phenomenon is probably well known to them.
> 
>   The Orion makes a fair radar set, as it turns out.
> 
>   73 Martin AA6E
>   --
>  
>
martin.ewing@gmail.com<mailto:martin.ewing@gmail.com>
>   http://blog.aa6e.net<http://blog.aa6e.net/>
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