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

[Dr. Gerald N. Johnson]

I used the pulse generator from QST May 1989 pages 22 to 24. And a 
Tektronix  475 scope that I bought ne about 1976. The scope is flat to 
200 MHz and I can see impedance changes at connectors.

73, Jerry, K0CQ

On 9/7/2016 7:38 AM, Chris Elmquist wrote:
>
>
> 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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