[TowerTalk] TH-7DX Balun

[Byron Tatum]

Hello-
  I thought I would ask here first - my question is about a good balun to use. I feel I should not use the BN-86 balun that is supplied with the TH-7DX, I have read too many bad things about it.
  I know the Hy-Gain BN-4000 is recommended to replace the BN-86. I was studying the materials used in the BN-4000 and was thinking about replacing the internals of my BN-86. I managed to get my BN-86 case apart without damaging it.
  There is a video on U-Tube about a defective BN-4000; the gentleman took the cover off in trying to find what was wrong with it. What confuses me is he describes, and shows in the video, a stub of small teflon coax that is not terminated. In the video you can see another length of coax, with the cores placed on it and terminating at the SO-239 connector, which he removed out of the potting material. I thought these baluns were constructed by placing about 50 type FB77-2401 torroid cores on short length of RG-303 coax, with nothing else. Is there something else? I thought I would ask if anyone is familiar with how the BN-4000 is built.
    Thanks, Byron WA5THJ