Thank you all for your response on the SWR issue with my Pro-57b. The
response was fantastic! To answer Billy's question, I am measuring the
SWR at the shack. Yes, I know it's better to measure at the feedpoint
but I am disabled-climbing towers is something I just cannot do myself
If it ever stops raining here in No. CA, we will try replacing the "Y"
feedpoint and see what happens. Sounds like the easiest way to go, and
keep using the Tuner until I get the problem solved. By the way, the
equipment here is Omni 6, model 293 tuner, AL-80b amp. Thanks again
everyone for the great input!
Dave - KB6JOX
>From: Billy W. Cox[SMTP:firstname.lastname@example.org]
>Sent: Monday, December 30, 1996 5:29 PM
>To: Dave Wright
>Subject: Re: Pro-57b
>Dave Wright wrote:
>>slightly high SWR on 10, 1:8:1. On 15/17 it was fine @ 1:2:1. 12 & 20
>>meters are virtually flat @ 1:1:1. (using 4 meters
>>rig/tuner/amp/mfj-249 and averaging.)
>>Now it's slowly climbing on 10- it's over 2:5:1 which precludes my >usage of
>>the amp. 15 & 17 now seem to be following- From 1:2:1 up to >1:8:1 now.
>>The factory told me to check the length of the coax/shield >"Y" at the
>>feedpoint and try making it shorter.
>Hi Dave !
>When you mention using the 4 meters, where are you measuring
>the SWR ? At the yagi feedpoint or in the shack at the end of
>the coax ?
>Right NOW, the 2.5:1 SWR on 10m ... is that measured in the shack
>or at the feedpoint ? If that's in the shack. I'd climb (safely)
>the tower and make a jumper to hook up the MFJ unit directly to
>the feedpoint and see what the SWR shows there. If it's low at
>the feedpoint using the MFJ unit, then I'd suspect the coax
>has become contaminated due to moisture or ???
>Let us know back what you discover as the problem ...
>73 and HNY !
>Bill AA4NU email@example.com
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