[50mhz] High SWR on a 4-element beam

W0MU Mike Fatchett w0mu at w0mu.com
Sun Mar 22 22:25:33 EDT 2015


Have you done a recalibrate?  Have you taken the coax from the antenna 
directly into the rig or the analyzer?

Mike W0MU

On 3/22/2015 7:32 PM, Ray Brown wrote:
>  It wasn't lightning. The rotor cable got chewed up by a lawnmower 
> because it had
> dropped down to the ground and I didn't know it and my son chewed it 
> up. :-(
>
>                Ray, KB0STN
>
>
> ----- Original Message ----- From: "Cecil" <chacuff at cableone.net>
> To: "Ray Brown" <kb0stn at sbcglobal.net>
> Cc: <50mhz at mailman.qth.net>
> Sent: Sunday, March 22, 2015 7:19 PM
> Subject: Re: [50mhz] High SWR on a 4-element beam
>
>
> What caused the rotor cable failure?
>
> If it was lightning related that could be the cause of the antenna 
> failure as well.
>
> Could be a damaged matching device on the antenna....or damaged feedline.
>
> Hard to know without more info.
>
> Cecil
> K5DL
>
> Sent using recycled electrons.
>
>> On Mar 22, 2015, at 6:55 PM, "Ray Brown" <kb0stn at sbcglobal.net> wrote:
>>
>> I finally got around to replacing my rotor cable on my 4-element 
>> beam, so that I can start playing around again on 6m. To be honest, I 
>> don't remember which brand or model it is. Anyway, I was trying it 
>> out on
>> just low power and according to my cross-hair meter,  I was getting
>> a very high SWR at 50.125. So I get my MFJ analyzer out and sweep it,
>> and I have nearly perfect SWR at 46 and 60 MHz, but very high elsewhere
>> on the band. The antenna looks okay, the rods are all in place and 
>> straight.
>>
>> Suggestions?
>>
>>
>>               Ray, KB0STN
>>
>>
>>
>>
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