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Author Topic: Broadbanded 6 Meter Beam  (Read 2576 times)
JAMES_BENEDICT_EX_N8FVJ
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Posts: 692




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« on: January 28, 2001, 08:42:22 AM »

I make use of both SSB and FM on 6 meters. A FM vertical antenna does not have enough gain for my local contacts. My Cushcraft 50-A3 is not broadbanded enough for low SWR on both 50.1 mhz and 52.525 mhz. Does any company manufacture a log-periodic that can provide low SWR on both frequencies and have about 6dB or better gain? If not, is a manual tuner available? Jim
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KB9UMT
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Posts: 426


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« Reply #1 on: January 29, 2001, 02:06:08 AM »

Hi Jim,
Yes they do make tuners for 6 meters....MFJ makes a few of them.

Models:
MFJ-903                  
MFJ-906   
Mfj wedsite:http://www.mfjenterprises.com/index.htm

And yes there are log antennas also that cover wide band spectrums...here a two companys and the website info:

http://www.tennadyne.com/specs&prices.htm
http://www.qsl.net/w4kma/vhf_uhf.htm

Couple of other things....I found many nice website both here on EHAM and on the web that have great plans for homebrew 6 meter antennas with good gain that you might try for a fraction of the cost and set up for a specific frequency...just a thought.
Also, looked like you were running a FT920 that has six meters in it (or manybe you do not have that radio anymore)..but the 920's int antenna tuner should tune the A3 beam fine I would think.  I have a Cushcraft 6 meter a3 beam and have no problems tuning.  

Good Luck and hope you find a solution de KB9UMT Don



                                       

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WB2WIK
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Posts: 21757




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« Reply #2 on: February 02, 2001, 02:12:12 PM »

General comment: What is it with "SWR" being such a big deal?  Good grief, who cares?  The only thing you should really be concerned with is if elevated VSWR prohibits your rig from transmitting, in which case this is easily dealt with by disconnecting that circuitry -- something I've done in every commercial radio I own, and have done for several years.  Normally, a line connects an internal SWR detector (reflected current sensing diode) to logic or a buffer that slowly biases the PA or its driving circuit into a full "off" (non-conductive) mode as SWR increases.  Find that wire, and pull it.  I've done this with my Ten-Tecs, Kenwoods, Yaesus, pretty much everything -- zero ill effect, but obviously doing so eliminates that sacred "SWR protection" hams seem to revere for some reason.  Not picking on anyone, but "the SWR is too high" is such a silly reason for not using an otherwise perfectly usable antenna...
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