Message text written by "Doug Kaherl"
Bob I noticed your comments about the ATX antenna and I seem to have the
same problems tuinging it. Did you get any good answers?
Doug K8DK<
Hi Doug,
Got two very interesting and helpful answers:
1) When tuning, extend the whip fully, and tune from the top down, not
bottom up! The SWR readings are worse from the bottom up.
2) You lose abt 1db of pwr for each external connector. I used a radio
shack right angle coax connector, terminated into a coax to male BNC
connector when I got the really bad swr readings from the 817 display.
-To further test my curousity, I connected (with the BNC male to coax
connector) to a MFJ antenna analyser. Connected the appropriate
counterpoise to the analyser's grd terminal. Got a 1.3:1 reading at
14.250Mhz. However, the swr on 17m and 10m (with appropriate counterpoises
per ATX instructions) were >25. I'm a relative newbie to the ant analyser,
so it may be my problem.
-As a stationary portable, I use the MFJ 971 and obviously have good
results. (With the MP-1 and this tuner, can only get 4 wts out, per the
meter reading).
-Using the ATX connected to the BNC terminal, as a pedestrian mobile, don't
have specific readings, but on 10m have worked international DX (Denmark,
Czech Rep, Ecuador and Brazil and others) while walking on the beach (great
ground there).
-Best,
Bob K4RLC
Windy Hill, SC
