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Old 15-Oct-2014, 8:34 PM   #2
Retired A/V Tech
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,708
The 4:1 transformer balun works well for VHF & UHF; the PCB balun works better for UHF than for VHF. The new UHF antennas with a built-in PCB balun don't pick up VHF channels as well as the older UHF antennas that used a separate 4:1 transformer balun.

So, it really depends upon your application.

If you need a low-loss balun for one channel, then the best choice is a DIY halfwave 4:1 coaxial balun cut for the frequency of that channel.
Awhile back, ADTech said that NEWER 91XG used a Printed Circuit Board (PCB) balun which uses unequal stripline delays to form the equivalent of a Coax Balun, which ONLY works on UHF Band and severely attenuates Hi-VHF. You probably could figure out a way to replace the PCB Balun....perhaps ADTech can help...
DB4e and DB8e use PCB (Printed Circuit Board) Baluns, which are VERY lossy in Hi-VHF Band, which is something NOT modeled by 4nec2:
If you can not measure it, you can not improve it.
Lord Kelvin, 1883

Last edited by rabbit73; 15-Oct-2014 at 9:10 PM.
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