Hi Steve, The 500hz rise in frequency that you're experiencing is common for
SteppIR Yagi's when the Reflector quits working. I second the recommendation
to join the SteppIR Forum and post your problem there as they will provide
great information on how you can test various components of your antenna
without taking it down. 73, Dick- K9OM In a message dated 3/21/2021 12:28:07
AM Eastern Standard Time, towertalk@contesting.com writes:
Join the SteppIR forum on groups.io. You will find plenty of
troubleshooting history there with a quick search. Also plenty of
SteppIR experience to tap into.
I am assuming you've done an calibrate....
73,
Steve
W1SRD
> I have a SteppIR model DB18 that I put up in mid-January.?? It's
> 3-elment 6-40 meters.?? Controller is an SDA 2000.?? It was working
> great for two months until the SWR increased recently, increasing to
> the 1.5-2:00 range.?? For example, the best I can do on 20 meters is
> 1.98:1 .?? I use a RigExpert AA-55 antenna analyzer to sweep over the
> band plus a little more on each end.?? It's odd that the SWR dip is
> usually around 500 kHz away.?? ??Clarifying that, I set the Controller
> to 14.500 and the best SWR is 1.98 at 14.020 on the analyzer.??
> ??Setting the Controller to 14.600 results in the lowest SWR of 2.00 at
> 14.100.?? it was never like that before.
>
>
> I used to be able to get it down to 1:1 by using the SDA 2000
> Controller to tweak its frequency a little thus matching the antenna
> element lengths to the transmit or analyzer freq.
>
>
> It has rained recently, and that is a thought.?? But it rained several
> time before, and even iced several times, without any impact.
>
>
> I was very careful when building the antenna to securely wrap all of
> the connectors to waterproof them,.?? The coax is new RG-213 purchased
> from DX Engineering.
>
>
> Could it be the Controller, or some part of the coax/antenna combo?
>
>
> Would appreciate your opinion to help me troubleshoot and solve the
> problem.
>
>
> tnx es 73
> Fred w3ICM
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