[Milsurplus] More FCC foolishness

[J. Forster]

Now, probably yes.

My understanding was the HF DF was partly a cover story for the cracking
of the Enigma and the Purple Cipher.

-John

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

>   As I understand it, accuracy is way better than one degree.
>
> Close enough to find Galt's Gulch.
>
>
>
> On 9/15/2010 9:49 PM, J. Forster wrote:
>> 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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