[Milsurplus] Low power DFing

[aGEnuine Ham]

Ray and gang:

There are few if any of us who operate a true comm or sigint site.  But,
where you have more than one receiver in operation, and especially where
frequency search is being performed, oscillator radiation is of great
concern, because Murphy will always assign frequencies related to each
other by some factor of an IF frequency.

Now, as far as weak signal DFing is concerned, consider this:  Accurate
bearings require use of the null method, because nulls are sharper than
peaks by their nature.  On the other hand, general seek direction can be
accomplished very nicely using the peak of an appropriately designed
system, which will get you close enough to then switch to null use.  I
don't know of any production systems which do this, but I sure used it
plenty of times on 75 M transmitter hunts back in the 50s.

73,
George
W5VPQ

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