Menu

Anyone recommend a source of 36:50 ohm ununs?

Search this Thread

Prev

Previous Post

Next Post

Next

#5

Report Post

Old

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

Ralph Mowery Ralph Mowery is offline

Ralph Mowery is offline

external usenet poster

First recorded activity by RadioBanter: Jul 2006

Posts: 702

Default

Anyone recommend a source of 36:50 ohm ununs?

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.

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Reply With Quote

Reply With Quote

Thread Tools	Search this Thread
Show Printable Version	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode

Posting Rules
Smilies are On [IMG] code is On HTML code is Off Trackbacks are On Pingbacks are On Refbacks are On

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Can anyone recommend a radio?	Nnaemeka David	Homebrew	1	January 16th 14 06:24 AM
Toroid material for SWL baluns/ununs.	John Smith	Shortwave	11	September 9th 10 10:06 PM
someone please recommend me a scanner	buttman	Scanner	5	October 7th 07 12:04 PM
"Ununs" = 'UN' to 'UN' { Unbalanced-to-Unbalanced Matching Transformer }	Telamon	Shortwave	0	September 8th 05 04:52 AM
Recommend Scanner	Tommy Of Earth	Scanner	7	April 11th 05 11:20 PM

All times are GMT +1. The time now is 04:39 AM.

About Us

"It's about Radio"

Contact Us RadioBanter forum home Privacy Statement

Copyright © 2017