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Author Topic: Adjust 20 m Hamstick for Low SWR  (Read 267 times)
IRABREN
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Posts: 273




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« on: March 08, 2008, 11:08:43 AM »

Where is best to adjust? - in the middle of the band ? at 14.175  OR - at the band area most frequently used - like 14.250  ?? What difference does it make?
Thanks & 73
Ira, KE5STP
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K0CCM
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Posts: 5




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« Reply #1 on: March 08, 2008, 12:52:39 PM »

Adjust the hamstick to the portion of the band you operate the most by using an antenna analyzer, such as the MFJ-259.  Adjust the whip portion for the lowest SWR at the operating frequency.  This will be close enough for most transceivers with an automatic antenna tuner.  Good Luck
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W5FYI
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Posts: 1044




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« Reply #2 on: March 08, 2008, 01:02:01 PM »

The 20-meter Hamstick has a 2:1 SWR bandwidth of 175 kHz, which is practically the whole voice portion of the band. Assuming 1:1 SWR would get 100% of the power to the antenna, 2:1 would guarantee that at least 88.9% of it gets there, which is still pretty good.

Most hams will tune mobile antennas for the portion of the band they intend to use most. If they have a net they like to keep in touch with, or a "watering hole" frequency, they'll tune for that; otherwise, they just tune for the antenna for the center of the band.

FYI, Stew
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IRABREN
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Posts: 273




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« Reply #3 on: March 08, 2008, 01:11:07 PM »

Thanks So Much Again !!- to all you wonderful Elmers - Where would I be without you !!( likely back just listening to talk radio !)
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N3JBH
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Posts: 2358




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« Reply #4 on: March 08, 2008, 01:50:39 PM »

Ira 14.275 might not be the spot you will want to hang your shingle as they say. but it would make a great place to center your adjusment too. And if you pick the right time to make the adjustments no one would even notice you being there hi hi.
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