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Author Topic: How do you make a 2M antenna bridge?  (Read 296 times)
KB9YOJ
Member

Posts: 15




Ignore
« on: January 25, 2001, 12:34:36 PM »

Are there any articles with schematics/instructions on Homebrewing a antenna bridge for VHF/UHF applications?  Thanks.

Matt
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WB6BYU
Member

Posts: 13242




Ignore
« Reply #1 on: January 25, 2001, 01:08:00 PM »

The ARRL handbook and antenna book used to have plans to build
a VHF/UHF wattmeter (forward and reflected power) using copper
tubing.

A standard resistive bridge will work if you pay attention to the
lead lengths - there are several plans for such devices around.

There was an article in RF Design magazine perhaps 10 years ago
by SM6MOM/W6 which used sections of coax cable and a couple
of trim pots to display the load impedance on an oscilloscope
display, in a form rather like a Smith chart (with separate axes for
resistance and reactance.)  This was somewhat frequency-
sensitive for proper operation (the cables were 1/8 wave at the
desired frequency) but was capable of displaying the input
impedance of a receiver, among other things.
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WB2WIK
Member

Posts: 20595




Ignore
« Reply #2 on: January 26, 2001, 06:09:20 PM »

Recommend you use your mouse for something other than catfood...

Try:

http://www.arrl.org/tis/info/pdf/9702033.pdf

I found this with my standard search engine in about two seconds after typing "VHF SWR BRIDGE DESIGN."  Please think about doing the same, instead of using this forum for such simple stuff.

This article is a complete, detailed assembly project with parts list, schematic, theory of operation, etc.  The design can be built in a couple of hours.

73
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K9CF
Member

Posts: 33




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« Reply #3 on: January 26, 2001, 07:55:11 PM »

Wow, WB2WIK, that answer was on the scrouge'ish side.
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KB9YOJ
Member

Posts: 15




Ignore
« Reply #4 on: January 28, 2001, 10:18:14 AM »

Hey WB2WIK!!!!!  Thanks for the great advice!!  Just remember, this is an ELMER forum.  There are no limits to the questions.

Matt
KB9YOJ

P.S.(Yes I am a new HAM)
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KE4HFG
Member

Posts: 12




Ignore
« Reply #5 on: December 19, 2003, 04:35:18 PM »

I am not a new Ham, although I am new to this sight. And after reading posts from WB2WIK this will be my last.

You sir, are a smart a$$, do not represent the values of teaching new Hams which the hobby invites.

You are condesending not witty and dry.

If you are old and feel old, then keep your personal ailments to yourself and off public boards. Yes, smart ass I can choose not to read your posts and that is my intent and will avoid the aggravation you so wittingly spit out.

I never ever thought I would run across another call that I look forward to seeing as a silent key.

Disregards Sir and looking forward....
KE4HFG
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