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rf swr meters

 
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byoungplumbing(at)gmail.c
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PostPosted: Thu Aug 16, 2012 1:41 pm    Post subject: rf swr meters Reply with quote
Quote:
I wondered if I could use the same SWR meter

I am not an expert, but after looking at the way the SWR meter works I would
think it isn't sensitive to frequency, and that it should work. Worth a try
anyway.

GeoB

Quote:
>>>>>>>>>>>>

GO TO
http://www.martinrfsupply.com/

and on the 4th line down on the left are pictures of the bird rf watmeters elements..... each element is for a different frequency and or power setting. so in short the answer is swr meters are different for different frequencies... unless you buy one that has interchangeable elements. or read the meter specification pages and see if it will work,,, there may be ( I haven't seen any) some conversion charts in the spec pages that would allow you to figure the correct readings if you are out of frequency ranges of the meter.

find a ham radio club, and ask for help. probably get help for free... or buy the correct equipment.

boyd young
kolb mkiii driver and
ham radio operator

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radiobluebook(at)gmail.co
Guest
PostPosted: Thu Aug 16, 2012 9:21 pm    Post subject: rf swr meters Reply with quote
SWR meters ARE sensitive to frequency. They are designed to only work inside a specific range of frequencies and no a CB SWR meter will not work. The CB band is pretty well centered around 27 MHz and aircraft band is mostly around the 122 range depending what you are using it for.

Boyd is right. Find a amateur radio person in your neighborhood and they will likely be more than happy to help you out with this little project. This is what we love to do.

I've built many antennas and there is something beautiful about a well tuned antenna.

Duane

On Thu, Aug 16, 2012 at 4:35 PM, b young <byoungplumbing(at)gmail.com (byoungplumbing(at)gmail.com)> wrote:
[quote] --> Kolb-List message posted by: "b young" <byoungplumbing(at)gmail.com (byoungplumbing(at)gmail.com)>


> I wondered if I could use the same SWR meter

I am not an expert, but after looking at the way the SWR meter works I would
think it isn't sensitive to frequency, and that it should work. Worth a try
anyway.

GeoB

>>>>>>>>>>>>>

GO TO


http://www.martinrfsupply.com/

and on the 4th line down on the left are pictures of the bird  rf watmeters elements.....   each element is for a different frequency  and or  power setting.    so in short the answer is swr meters are different for different frequencies...  unless you buy one that has interchangeable elements.     or read the meter specification pages and see if it will work,,, there may be ( I haven't seen any) some conversion charts in the spec pages that would allow you to figure the correct readings if you are out of frequency ranges of the meter.

find a ham radio club, and ask for help. probably get help for free...    or buy the correct equipment.

boyd young
kolb mkiii driver and
ham radio operator


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zeprep251(at)aol.com
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PostPosted: Fri Aug 17, 2012 5:15 am    Post subject: rf swr meters Reply with quote
Boyd,
Installed your antenna at 25" using my old cb SWR meter.Cut the center lead off in 1/4" increments until it was down to 23" and I quit there because the meter still showed deep in the red at 3.5 and was not changing with the trimming.That's when I figured the meters must be different.I have a chart that shows the length of the antenna for frequency desired.123.475 comes out to be 22 3/8 approx.It received OK and could transmitt but this was not in the air or at any great distance just to another hand held on the field and I was afraid I might damage the radio so I quit experimenting . Thanx G.A.
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jacklockamy(at)comcast.ne
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PostPosted: Fri Aug 17, 2012 9:14 am    Post subject: rf swr meters Reply with quote
Cut it down to 21” and you will be CENTERED in the VHF Air Band….

Jack in Key West

DO NOT ARCHIVE

From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of Gary Aman
Sent: Friday, August 17, 2012 9:13 AM
To: kolb-list(at)matronics.com
Subject: Re: rf swr meters


Boyd,
Installed your antenna at 25" using my old cb SWR meter.Cut the center lead off in 1/4" increments until it was down to 23" and I quit there because the meter still showed deep in the red at 3.5 and was not changing with the trimming.That's when I figured the meters must be different.I have a chart that shows the length of the antenna for frequency desired.123.475 comes out to be 22 3/8 approx.It received OK and could transmitt but this was not in the air or at any great distance just to another hand held on the field and I was afraid I might damage the radio so I quit experimenting . Thanx G.A.
--

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