[Milsurplus] More FCC foolishness

[J. Forster]

I repeat my point. DF will not really nail down a Tx location. It can, at
best, get you in the area.

If you are 100 miles from the Tx and have a 1 degree accuracy in DF
bearing, your estimate of position is about 1.5 miles. At 1000 miles, it's
15 miles.  That's a lot of area to search.

-John

============

>>: The ability to DF intermittent signals of even a few msec has been with
>>: us for ten years. If a serious target gets on their radar you don't
>> have
>>: a chance of avoiding detection to a very high degree of accuracy.
>>
>>Now walk to the next room and the original location is useless.
>
> The capability to DF even very short-lived intermittent HF signals is a
> science that was perfected almost 70 years ago.
>
> Just look at the British FH-4 HFDF set for an example.  These were able
> to point the signal's direction on a CRT display even in response to the
> very short Morse burst signals of nearby U-boats.  Huff-Duff was a very
> effective system, as the Kriegsmarine found out.
>
> Amazing technology, and not a microprocessor anywhere!
>
> There's nothing new about instantaneous DF.
>
> Mike / KK5F
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