Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old June 6th 13, 07:23 PM posted to rec.radio.amateur.moderated
external usenet poster
 
First recorded activity by RadioBanter: Jan 2013
Posts: 41
Default Antenna sharing project

Back around 2007, with the radio shop in Los Angeles, I wanted
to make a antenna distribution system. So one antenna could
"source" multiple radios. having an antenna to test radios being
repaired on the bench and showing off radios up in the front to
customers.

I built a small amplifier to do that with. Didn't work. Got
distracted and went onto other things that took priority.

Around January, I decided to have another go at it. Found out
why it didn't work and wet about fixing it. Turns out it NEVER
would have worked at all. Sigh, always something.

Then sitting in the bathroom, re-reading a 4-5 year QST magazine
I stumbled across a nice "antenna multi-coupler" project. Except
that the parts used were already obsolete.

So I came up with a substitute and surprisingly that worked quite
well.

Now I need an antenna that works across a broad spectrum. From
broadcast band (0.54 to 1.7 MHz) and up through 30 MHz.

Enter the whole terminate folded dipole project up on the roof.

It's finally up and assembled. All 122 feet of it. And it seems to
work amazingly well over the entire range.

Technically, I have accomplished my goal.

But of course, it _would_ be nice if I could use this antenna for
transmitting as well since I'm am licensed to do so. So that's
where the extra "flailing around" comes in.

I have ordered some commercial parts for less than it would
have cost me to fabricate them myself. Those should be here
Friday or next Monday. I'm hoping that solves the transmit
issue.

But as I said, the original goal has been met. Quite well.

Jeff-1.0
wa6fwi


  #2   Report Post  
Old June 10th 13, 12:48 PM posted to rec.radio.amateur.moderated
external usenet poster
 
First recorded activity by RadioBanter: Jan 2013
Posts: 41
Default Antenna sharing project

On 6/6/2013 12:23 PM, Foxs Mercantile wrote:
I have ordered some commercial parts for less than it would
have cost me to fabricate them myself. Those should be here
Friday or next Monday. I'm hoping that solves the transmit
issue.


The parts came in. A 300 watt 800 ohm termination and a 1 KW
16:1 balun.

Without any antenna tuner, the as measured SWR is at or below
2:1 to one and in some cases 1.5:1.

This is on all bands from 1.8 MHz to 30 MHz.

This is well within the range of "ok" as is and the internal
antenna tuners make quick work of it.

Jeff-1.0
wa6fwi



Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
sharing antenna between ssb and weather fax Virginia johns Antenna 4 October 27th 10 05:31 AM
Antenna Sharing for Marine - Weather Fax/NavTex and SSB-DSC Wet-n-Wild Bill Antenna 6 April 20th 06 02:22 PM
ANTENNA SHARING Big Nose Antenna 6 March 17th 06 06:40 PM
Sharing one antenna among two transceivers? Chuck W. Antenna 12 April 22nd 05 11:17 AM
P2P FILE SHARING Paul General 0 April 5th 04 02:12 PM


All times are GMT +1. The time now is 05:33 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017