[Antennas] VSWR on Log Periodic.

2002年4月24日 20:22:13 -0400

In my opinion, the ONLY meaningful SWR measurements are AT THE ANTENNA..
NOT at the shack!
Don - N8DE
Dave Shrader wrote:
>> I have an 8 element LP [Tennadyne T8] at 40 feet on Rohn 25 over New
> England soil. Tonight temp is 45F, Humidity is 50%, soil is average New
> England with grass growing without irrigation. It slopes off by 10 feet
> to the north.
>> I made some claims regarding VSWR from 13 MHz to 33 MHZ. Attached are
> the actual readings at my location using both the VSWR meter in ICOM 746
> and a Daiwa CN 101L
>> Frequency VSWR
> 14.0 1.3
> 14.1 1.3
> 14.2 1.3
> 14.3 1.4
> 14.35 1.4
>> 18.07 1.5
> 18.17 1.4
>> 21.0 1.7
> 21.1 1.7
> 21.2 1.7
> 21.3 1.6
> 21.4 1.5
> 21.45 1.5
>> 24.89 1.5
> 24.99 1.7
>> 28.0 1.8
> 28.1 1.7
> 28.2 1.5
> 28.3 1.3
> 28.4 1.2
> 28.5 1.1
> through 29.5 1.1 [every 100KHz from 28.5 to 29.5 is 1.1]
> 29.6 1.2
> 29.7 1.2
>> Not bad for a nominal 5.8 dBd antenna. These readings are unique to my
> location and should be used only for nominal purposes of supporting my
> assertion that a LP is uniformly a VG antenna across the 20 meter to 10
> meter ham bands.
>> Dave, W1MCE
> - - -
>> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
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