[NLRS] SWR infinite on 432.....rats!

[Zack Widup]

Too bad you don't have a TDR (time-domain reflectometer). Very useful piece
of equipment. It would tell you where the trouble is.

73, Zack W9SZ


On Tue, Sep 6, 2016 at 8:34 PM, David Palm <thepalmhq at gmail.com> wrote:

>
>
> So I've been having a bit of intermittent and puzzling issues on 432 MHz
> for the last few weeks.  I got through the UHF contest okay, but as of two
> days ago the SWR has decided to go infinte and stay infinite.  I swapped
> out the N connector on the LMR-400 down-cable right at the rig, which after
> a lot of horsing around to figure out the problem, had started to seem
> flaky anyway.  No change.
>
> I've run the rig into a dummy load and I know for sure I'm getting power
> out and that into a 50 ohm load everything is as it should.
>
> So....it seems that the only thing is to break this down by subsystem.
> First, climb up there, unwrap the waterproof connection between the LMR400
> down-cable and the flexible rotor loop, terminate the main down-cable with
> a 50 ohm load, and see if that's the culprit.  If not then climb all the
> way up, detach from the antenna and test the rotor loop by itself.
> Finally, test the antenna with a known-good cable.
>
> Any hints or sage advice out there on making this easier?  Or more probably
> it just is what it is.
>
> 73,
>
> David  W9HQ
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