(meteorobs) US Air Force Space Surveillance Radar - tuning in?
stange34 at sbcglobal.net
Thu Jan 22 00:13:50 EST 2009
For clarification, broadside is meant to mean orientation such that the flat
plane of the antenna, as viewed from the side, is aimed at the transmitter
for least signal.
----- Original Message -----
From: "stange" <stange34 at sbcglobal.net>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: 2009/01/21 20:53
Subject: Re: (meteorobs) US Air Force Space Surveillance Radar - tuning in?
> Bob I wonder if he might be better off making his own Yagi?
> If he is using a commercial TV antenna, it probably has a lot of phased
> director wiring on it (plus multi-band FM elements) which would pick up
> 216mhz signal even if antenna is broadside to the radar source and it
> be difficult to null out the carrier.
> With a clean Yagi cut to 216 mhz. with parasitic director(s) only, a
> broadside orientation could null out that radar with proper lead-in, but
> coarse being broadside it would reduce the aiming directions only to
> broadside of the stations actual location.
> Just a thought....
> ----- Original Message -----
> From: "bob71741" <bob71741 at yahoo.com>
> To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
> Sent: 2009/01/21 19:51
> Subject: Re: (meteorobs) US Air Force Space Surveillance Radar - tuning
>> Thomas - I am surprised that the NAVSPASUR signal is that strong at
>> your location to be received continuously.
>> I would choose CW reception at 216.98 MHz and set the BFO for ca. 1
>> KHz offset with an IF bandwidth of from 7 to 15 KHz for normal reception.
>> If the carrier is still bombing through, you may want to try to point
>> your antenna towards Phoenix and tune to 216.97 MHz for the Gila River
>> Transmitter.The power at this frequency is much lower that the Texas
>> Transmitter, and I believe that the antenna pattern extends towards
>> the Western US, but you should still get meteor scatter from it. The
>> Gila River carrier is too strong for me to try locally.
>> You may also want to tweak your antenna to 45 degrees or more
>> vertically to try and reduce the carrier, but still be able to receive
>> meteor scatter.
>> As I write this I am listening in to NAVSPASUR on
>> spaceweatherradio.com and just got a meteor return for over a minute
>> and a half, which is a big one for this frequency. MY station is off
>> the air at the moment as I am switching over to SNOTEL, and Mexican TV
>> stations after the February cutoff of US analog TV stations.
>> Best Regards
>> --- In meteorobs at yahoogroups.com, Thomas Ashcraft <ashcraft at ...> wrote:
>>> Can anyone give me advice on tuning into the US Air Force Space
>>> Surveillance Radar in Texas?
>>> I am using an ICOM PCR1000 radio with a tv antenna pointed towards
>>> Archer City, Texas and am tuned at 216.980 MHz. Using USB I get a very
>>> strong tone. Is this the tone of the radar? Any advice as to
>> settings (
>>> USB/LSB/CW ? ) and what filtering combination is best is welcome. I
>>> wonder if you can receive meteor scatter without having the constant
>>> tone in the background?
>>> Thank you in advance for your reply.
>>> Clear skies,
>>> Thomas Ashcraft
>>> ashcraft (at) heliotown.com
>>> New Mexico
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