[Milsurplus] "More FCC Foolishness"

Tue Sep 14 21:16:55 EDT 2010

The "Elephant cages" are mostly gone for a specific reason.  They only produce one Line of Bearing (LOB) per rotation of the goniometer.  No elevation information, or very coarse information depending on which system.  

Modern systems use interferometers and computer based phase comparisons, able to make both elevation and azimuth measurements at an almost instantaneous rate.  And the number of channels is limited only by how many receivers, processors, and computers one wants to buy.  Elevation and azimuth data, along with a few ionospheric soundings produces location data from a single DF, not requiring cross bearings from multiple sites.  Tradeoff is less antenna capture area, so less sensitivity to very weak signals.

FCC made a good presentation on their present DF net at the SwRI DF conference 4 or 6 years back, but alas, it was in the classified session.

73,
George
W5VPQ

---------- Original Message ----------
From: "J. Forster" <jfor at quik.com>
To: nerd at verizon.net
Cc: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] "More FCC Foolishness"
Date: Tue, 14 Sep 2010 17:46:11 -0700 (PDT)

Even with the best DF gear, you only get a rough position. It eventually
comes down to sending out field personnel.

If the signal is intermittant and goes on and off randomly, it's a lot of
effort to find it.

Take a look at the pics of "elephant cages" some time.

-John

==========

>   I found out about it in trying to get some Watkins-Johnson receivers and
> DF
> gear that were being surplussed.  Most of that, as manually-operated
> equipment,
> was phased out in favor of the remote systems.  I never got a line on any
> of the
> W-J stuff (you had to have connections to be able to buy those) but I did
> hear a
> lot about their new system.
>
> Obviously, having such a system, and using it, are two different things.
>
> ..P
>
>
> On 9/14/2010 7:38 PM, J. Forster wrote:
>> Word was the Brits has nuke subs off the Falklands too.
>>
>> -John
>>
>> ============
>>
>>
>>>    Word is that the FCC has a vast network of very advanced automated
>>> DF
>>> stations
>>> accessed over a secure broadband network.
>>>
>>> If they're looking for you, they can find you.
>>>
>>>
>>>
>>> On 9/14/2010 6:59 PM, John Hutchins wrote:
>>>>     All -
>>>> 2-shay!  The government cant find, or secure, Bin Laden but they know
>>>> where you live!
>>>> Breaker breaker 10-2,  10-30,   10-67, 10-99
>>>> Out
>>>> -Hutch
>>>>
>>>> On 9/13/2010 12:49 PM, Hue Miller wrote:
>>>>> As an excuse for this Verbot, the FCC offers:
>>>>> Tragic interference to the aviation, marine, police, fire
>>>>> and military radio communication systems can result
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