This solution from KK9A is not correct. The HamIV has a mechanical break, a wedge that goes in to a slot in the housing, it is very common that the wedge breaks. Hopefully (usually) it´s only t
If you get the Yagi at 1/2 wl or more it will beat the heck out of the 4SQ, even a dipole at 1/2 wl will beat the 4SQ with about 2 dB. I have a 4SQ (about 160 radials) and a 3 el Yagi at 90 ft , yagi
Don´t forget the German HOSCHA switch. I have a Hoscha 2000 switch that measures: 30 MHz 42 dB return loss, isolation 54 dB 145 MHz 35 dB return loss, isolation 41 dB 435 MHz 35 dB return loss,
eeee hmmm, guys dont kill me now but to be in phase, and I guess that´s what you want, the feedlines has to be EXACTLY the same lenght. They "don´t need to" be mults of electrical wl, the
This is correct but the dipole has to be at least half a lambda up in the air. Forexample, 4SQ gives approx 5.5 dBi and with losses in near field lets say 4.5 dBi, a dipole at 1/2 wl gives approx 7 d
As far as I remember OWA=optimized wideband array, that would explain it all! Why in the first place use a OWA design on 50 MHz? Not needed with so narrow band. 73 Jim SM2EKM --
Do I get this right, the C31XR doesn´t work out of the box? From the below it seems to me that the C31XR needs to be rebult to work properly. It´s been stated on this reflector over and o
Don´t think you understod me either. As far as I remember I never talked about hights for antennas, how to tune them, MFJ analyzers, crank up towers etc etc. What I stated was that my feeling w
Problem with YO is that the calculating engine is far too simple, you really have to be carefull with what you are doing. In any case, I would not trust YO alone, I would confirm my design on a progr
Another comment: Below I mean NEC 2, or 3 or 4 calc engine. And even NEC2 has a problem with close spaced wires so for designs like that I never ever would use anything else but NEC2-4 stuff. 73 Jim
Agree Tom. I´ve done a lot of modeling with NEC2 and it looks like 20 ft is very safe, I know that 10 is pritty bad and 15 is "pritty" good, your real life experience seems to say the same. 73