[TowerTalk] Best Coax (Matching 50 to 75 Ohms)
Sat, 15 Apr 2000 10:30:43 -0600
Good information on series coaxial transformers Gerald (K5GW).
Re: Connectors, at HF, I just take the cheap and easy solution:
Solder the center conductors together, solder a ground lug on
the braid of the flexible line, and hose clamp it to the shield
of the hardline. Turn the cables upward and top with a taped
plastic pill bottle, open on the bottom to allow air in / out.
During the past 22 years at this QTH, such splices have proven
to be the MOST RELIABLE. Every type of home brew CATV
connector I have built has failed due to moisture getting in the
adapter and eventually burning / shorting out when 1KW of RF
at the wrong frequency is inadvertently applied during the heat
of a contest or DX quest!
Regarding stacks, it seems easier to just use an odd multiple of
1/4 WL 75 Ohm line to raise the 50 Ohm antennas to 112 Ohms
and then parallel back to 56 Ohms.
de Tom N4KG
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