I made a simple 1:1 receive-only balun for 160 meters by winding 9 bifilar turns
of no. 24 enameled wire on an FT37-77 toroid. I connected a 50-ohm resistor to
the output and my MFJ antenna analyzer to the input. On 1.8 MHz it shows a
resistance of 50 ohms, an inductive reactance of 1 ohm, and an SWR of 1.0:1.
My question is, did I make a 'good' balun? Are there other tests I should do?
It's job will be to isolate a receiving loop antenna from its feedline, to keep
the nulls deep and reduce noise pickup.
The RANT feature of the K2's 160-meter option has made it possible for me to use
a ferrite loop which is only 21 inches (53.3 cm) long and has a s/n ratio much
better than my inverted L transmitting antenna, even without the balun. I'll
put details on my website after I finish testing it.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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