RadioBanter - View Single Post - Anyone recommend a source of 36:50 ohm ununs?

Ralph Mowery · July 26th 16, 04:16 AM posted to rec.radio.amateur.antenna

In article ,
says...

Not a whole lot. If you had a perfect lossless match at the antenna
base, you'd cut your coax loss by about 40%, and gain .281 dB of
signal.

Then, compare that to ground losses. Based on a cursory glance at
some figures on the web, it looks as if a quarter-wave vertical
monopole installation can easily lose 2-3 dB in the ground, even with
as many as 24 radials. Might need up to 60 radials to get down to 1
dB of ground loss. Matching or not-matching the antenna to the
feedline won't affect these losses significantly.

So, it may be that SWR loss in your coax isn't the best place to spend
your efforts... at least, not at first. Adding more radials, or
elevating the radials above ground may have a greater payback.

Unless something unusual is going on he will probably burn up way more
in the unun than if it is not used. When below around 8 MHz coax has
very low aditional loss for a SWR of 3 or 4 to 1.

Not sure of the antenna being used, but if it needs a radial system,
that would be the place to spend time and money.

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