(meteorobs) CW RADAR Meteor Detection Receiver...Further thoughts.

[Larry]

This RADAR system which apparently was turned over to Military use, would 
likely remain somewhere close in carrier frequency otherwise a massive 
restructure of the resonant antenna system would be necessary. Therefore the 
carrier frequency should be close to the original frequency which might be 
traceable on line.

I suspect that it is entirely possible that the 215 Mhz is a CW MODULATION 
of the RADAR frequency. I am not convinced with what I read quickly...that 
the RADAR frequency is 215 Mhz even tho' it would be easier to set up a 
receiver detection circuit if it were the principle carrier. The precise 
modulation frequency would probably be changed by the Military to another 
frequency.

Assuming 215 mhz is NOT the carrier but is the modulation, a WIDE-BAND 
detector circuit and antenna which covers the original carrier frequency and 
frequencies nearby could be constructed with high gain 215 mhz amplifiers 
for a modulation detection.

Starting points would be:

1) Searching for the original NAVY carrier frequency on-line,
2) Build an antenna with low gain for microwave frequencies to help a 
scanner,
3) Using a Scanner to hunt for both carrier frequency and modulation 
frequency, It should stand out with the power and location of these 
transmitters along with the numerous returns..
4) Depend on High Altitude aircraft returns for strong signals before 
developing a high gain circuit arrangement for meteor returns.

Just a little musing here....... I do not intend to set up any detection 
system at this time.

 -YCSentinel

----- Original Message ----- 
From: "Larry" <ycsentinel at att.net>
To: <meteorobs at meteorobs.org>
Sent: 2009/10/15 01:27
Subject: (meteorobs) CW RADAR Meteor Detection Receiver...A better way?


> Portions of bottom URL.....
>
> One of the lesser-known assets of the US Space Command's world-wide space
> surveillance system is the 217 MHz NAVSPASUR "fence" across the southern 
> US.
>
> A constant and vigilant surveillance of potentially hostile military 
> threats
> is critical in preserving the operational effectiveness of our armed 
> forces
> around the world. Naval Space Command manages two distinct surveillance
> efforts in support of Fleet and Fleet Marine Forces: tracking satellites 
> in
> orbit and monitoring over-the-horizon threats from sea and air forces.
>
> First, Naval Space Command operates a surveillance network of nine field
> stations located across the southern U.S. Three transmitter sites in the
> network are located at Jordan Lake, Ala., Lake Kickapoo, Texas, and Gila
> River, Ariz. Six receiver sites are located at Tattnall, Ga., 
> Hawkinsville,
> Ga., Silver Lake, Miss., Red River, Ark., Elephant Butte, N.M., and San
> Diego, Calif.
>
> These surveillance stations produce a "fence" of electromagnetic energy 
> that
> can detect objects out to an effective range of 15,000 nautical miles.
>
>
>
> IV. NAVSPACECOM FENCE
>
> A. Dedicated low-earth orbit (LEO) detection sensor; does not track.
>
> B. Unique multi-static radar interferometer sensor system consisting of
> three transmitters and six receivers located across the US at 33N.
> 1. Covers 5000 nm (15% of earth's circumference).
> 2. Measures frequency, time and angle of detection
> 3. Transmits on 216.98 MHz:
>
>  Kickapoo Lake 767 Kw
>  Gila River 40 Kw
>  Jordan Lake 40 Kw
>  fas.org/spp/military/program/track/spasur_at.html  (add the http & www
> stuff)
>  Although turned over to the Military....This might still be running and
> useable.
>  YCSentinel
>
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