Hello Mike,
Something to try:
Have you tried (with the suggested measurements from the DXE manual) to
measure the 30 meter VSWR using your radio and a good wattmeter?
It is possible that something (AM broadcast, etc.) is affecting your MFJ
analyzer's ability to give you the correct VSWR reading.
We will be more than happy to walk through additional testing tomorrow with
you (or your friend) via email or call our toll free line. Do not hesitate
to contact us. We will get you fixed up.
73
Tim K3LR @ DX Engineering
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Mike
Ryan
Sent: Sunday, December 04, 2016 3:32 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Tunig the DX Engineering "Thunderbolt" 30/40 Vertical
A friend recently purchased one of these 30/40 verticals from DXE. Out
of the box with the suggested measurements it tunes pretty easily on 40.
With a few adjustments to lengthen it (these are made above the 30m trap per
the instructions) it is near flat across 40.
Thirty meters is another story..
No adjustment(s) appears to effect 30 at all. I shortened the antenna
(below the 30m trap) as much as 9" just to see if there were ANY difference
in the resonant freq. None was found. With an MFJ analyzer the swr at 9.45mz
is still 3:1 or worse at 50ohm point., and the higher in freq we move, the
worse the swr becomes. We see no 'sweet spot' occurring anywhere in the 9 -
11 mhz range at all while 40 is quite good. Another neighboring ham has
one of these antennas and had to make very few adjustments to get his to
play well.he suggests that the 30m trap may be defective.
Has anyone had one of these with good or bad results to report?
-Mike
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|