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Old November 21st 06, 01:39 AM posted to rec.radio.amateur.antenna
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Default matching 50 ohm line to 75 ohm antenna


"Dave" wrote in message
. ..
JIMMIE wrote:

SNIPPED

On a double boom LPA ithe nominal value can be around 50 ohms, It
depends on the spacing of the booms. Bill Orr has a design for 6 meters
that used 3 or 4 elements in an LPA and then added a few parasitic
elements. I tried this antenna and mine had no noticeable improvement
over my 4 element Yagi Jimmie D


Jimmie, I would expect no improvement in GAIN over a four element Yagi.

But how does the VSWR compare between the two antennas when measured
continuously from 50.0 to 54.0 MHz? I expect the LP will have a more
uniform VSWR. That is why people choose LPs. Namely to get a 'flatter'
VSWR response.

/s/ DD

I was never really interested in covering the whole band , just the first
1.5 Mhz or so. The SWR was comparable in this area on both antennas. The
Yagi was easier and cheaper to build.


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