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

[Chris Elmquist]

You could make one...

https://youtu.be/9cP6w2odGUc

I think W2AEW's videos are very well done.

Chris N0JCF


On September 6, 2016 9:37:53 PM CDT, Zack Widup <w9sz.zack at gmail.com> wrote:
>
>
>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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-- 
Chris Elmquist