[Milsurplus] Low power DFing

[aGEnuine Ham]

Hue:

Quite often when starting, the null was apparently more than 180 degrees
wide due tovery  weak signal.  Cunning transmitter hiders.  Since most
people used loops, the  idea was to get far enough away to make sure the
signal at the starting point was marginal.  Anybody can DF on strong
signals.  So you drive for stronger signal until the center of a useful
width null (30 degrees or less) can be interpolated.  I suspect that
signals that weak were not of interest to the Navy, assuming they were
out of the range of action.  Modern Navy DF shipboard DF specs are for
relatively strong signals, several tens of dBs stronger than I was used
to dealing with at sigint shore sites.

73,
George
W5VPQ

> 
> Can you explain this for me a little? Did you use this technique 
> because the
> low level signal was too much in the noise level for easy solid 
> nulling?
> Otherwise i don't understand why you would not rely on nulling for 
> the whole
> hunt process. Partly my curiousity is because the "official" Navy 
> procedure,
> IF i recall from the DU manual, is to null, get the bearing down, 
> then switch to
> "D" direction and determine which null is correct.
> Tnx-  - Hue Miller
> 


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