LONGWIRE ANTENNA DX up to 40 MHz or more homemade
BALUN UNUN 9:1
50 OHMS UNBALANCED TO 450 OHMS BALANCED
homemade End Fed with a 9:1 unun balun
. EXCELLENT RESULTS IN SWL HF
ALSO 4:1 AND 1:1
It worked very well also below 3 MHz and medium wave
In fact all radio is good, but without a good antenna does not work
I was gradually rising frequency and 200 MHz reception was full scale, extremely low noise
aand excellent quality
For tests used Radio Tecsun PL-660 modified part of the squelch and Radio Icom IC-R20 connected to the notebook and controlled by Ham Radio Deluxe software using a homemade interface
USB to serial to TTL level conversion
radio signal level.
To connect the balun to the radio used 20 meters of coaxial cable 50 OHMS and
BNC connectors
The Internet has several projects balun
Exceeded my expectations
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