From: lumpy@digitalcartography.com   
      
   miso@sushi.com wrote:   
   > I'm quite sure the null is better   
   > than the directional antenna   
      
   Then in approximately what manner   
   are you hoping to improve what parameter?   
   You want a stronger null?   
   or   
   You want more sensitivity?   
      
   They aren't exactly the same. Your smaller   
   loop is probably less sensitive but has   
   a higher Q, even if it's nowhere near tuned   
   to the freq.   
      
   Stick that smaller loop in front of the big loop.   
   Make the small one passive and the large loop active.   
   Vary the distance till you get a stronger   
   signal. That will be an increase in sensitivity   
   and an even bigger increase in selectivity (stronger null).   
      
   You're relatively close at 10 miles. If you were several   
   hundred miles, I'd suggest experimenting with a driven   
   broadside. Both loops active, side by side.   
      
   > ... It would be best to have a meter on the AGC,   
   > but I don't have any radios with such a tap from   
   > the factory...   
      
   I thought all S meters were coming off the AGC.   
      
   If you have the ears for it, I would trust headphones   
   before any kind of meter, digital or analog.   
      
   What's the nature of the signal that you're   
   DF'ing? CW, I presume. Theoretically it should   
   be much easier to DF a CW signal if you don't   
   know (or aren't tuned to) the exact RF freq.   
      
   Finally, 10 miles isn't very far, in terms of   
   where I assume you're working. You ought to be   
   able to almost shine a spotlight on the darn   
   thing at that distance. So I presume there's   
   some terra firma inbetween you and the xmitter.   
   Can you hit it from three directions and form   
   a "triangle of probability"? Once you have an   
   RF picture of where it "should" be, then look   
   at the topo to find where it "could" be. If   
   it's a transmitter, humans have to get to it   
   to service it.   
      
      
   Lumpy   
   --   
   Were you the voice of Casper?   
   No. Popeye, Snagglepuss and Wells Fargo Bank.   
   www.lumpyvoice.net   
      
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