| Author |
Message |
    
392
| | Posted on Sunday, October 26, 2003 - 10:26 pm: | 
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I purchased a 1/4 wave groundwave for 6 only.. Manual said nothing about 2 but I tried it anyway and fond low swr on most of the band. It hears and talks very well on 2m so I tried 70cm and wow, kicks a#@ on 70, low swr, hears great. Is this a fluke or normal. If it's 1/4 wave on 6, what is it on 2/440. It's a vectra brand, 55 inch radiator with 4 radials, about $69.99.
392 |
Bruce
| | Posted on Sunday, October 26, 2003 - 11:18 pm: |
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A 6 meter 1/4 wave is a 3/4 wave on 2 and works fine on 440 it is 9/4 wave and sometimes will also work i done this too with other antennas . |
392
| | Posted on Monday, October 27, 2003 - 10:29 am: |
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Bruce, does this mead any 6 meter antenna also works on 2? Including 3 element yagi's? Boy could this save me some space, and poles.
392 |
Bruce
| | Posted on Monday, October 27, 2003 - 12:33 pm: |
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No only a 1/4 wave driven elem will... AS and Hygain back in the 60's sold 6&2 beams they mixed elems with a pair of driven elems on one boom. Now you can make a quad and wind both 6 and 2 meters on the spreaders. |
ryan
| | Posted on Monday, October 27, 2003 - 1:10 pm: |
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oh man. i need to build me a 9/4 wave antenna for 11 meters. i'll rip all other omni users apart |
Bigbob
| | Posted on Monday, October 27, 2003 - 8:37 pm: |
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ryan,an 81 foot driven element?Are you serious?Wow,holeeee. |
ss8541
| | Posted on Monday, October 27, 2003 - 9:22 pm: |
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odd 1/4w lengths are always resonant. the gain will increase, but bandwidth will decrease. so you aren't getting something for nothing. there is a tradeoff, gain for bandwidth. |
Bruce
| | Posted on Tuesday, October 28, 2003 - 4:40 am: |
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true and if your realy crafty you could mount several small decoupling stubs for 440 and get more gain..... antennas are SO much fun. |
Simon
| | Posted on Tuesday, October 28, 2003 - 11:02 am: |
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Heck, just slide the whip into a pvc pipe and glue aluminium ( English spelling) foil at the 70cm quarterwave points to decouple. With a bit of trial and error to tune it works extremely well.
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