The J pole I got gave the closest feed impedance to 50 Ohms (@ 146 MHz)
when the four radials were exactly perpendicular to the radiator. When
testing any antenna, keep conductive objects at least a wave length or more
away from the radiator.
Gary, K5AMH
On April 22, 2020 6:39:13 AM Jonathan Guthrie via BVARC <[email protected]>
wrote:
I don't think there's a difference between one conductor and another except
for a slight difference in efficiency. The problem with a JPole is that
there are three separate bits that can need adjustment (the length of the
radiator, the length of the quarter-wave stub, and the position of the
feedpoint on that stub) and if you don't adjust the right one, you'll get
poor results.
On 4/21/2020 2:52 PM, ralph phillips via BVARC wrote:
Having problems with my home brew 440 mhm jpole...will not tune better than
a SWR 1.9. Books and articles no help. Will velocity factor or resistance
change dimensions for steel vs aluminum??
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________________________________________________
Brazos Valley Amateur Radio Club
BVARC mailing list
[email protected]
http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
