[Milsurplus] More FCC foolishness

[Peter Gottlieb]

  I heard the same.

DF has improved a lot since then though.



On 9/15/2010 10:02 PM, J. Forster wrote:
> 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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