Saturday, February 25, 2012

Latest in the tape measure yagi antennas

This author has taken the tape measure yagi antenna project one step further.  Completing another 4 element tape measure antenna, I  decided to try and stack the two yagi antennas 1/2 wavelength apart and co-phase the two together.
Remember when co phasing antennas, the feed lines are exactly the same length.  To achieve this, I changed coax feed line to LMR-400.
Preliminary testing is generating some good results.  Have been able to access distance repeaters that I was unable to with the rubber duck antenna on the HT.

This is the test station in operation.  HT is a Icom T2H with extension mic, on 1 watt output power.

Wednesday, February 15, 2012

tape measure yagi antenna

latest in my antenna designs and builds is a 4 element tape measure yagi for 2meters.  its compromised of a
41 3/8" reflector,
 driven element 17 3/4" each.
 1director 35 3/8",
 2nd director 33 3/8" .
boom spacing from reflector,  8" to driven element.
from driven element to 1st director 12"
from 1st director to 2nd  14"

8" AWG 14 gauge wire as a hair pin match. fed with RG 58U coax.