Val,
I found 2 broken solder joints in the inductor box at base which I repaired.
At least one of the broken joints appears to be related to the broken cable
ties which then put the weight of the inductor on the solder joint. I
replaced the cable ties. There were cob webs running across the solder
traces which I cleaned off. No real evidence of arcing.
Screws on traps were loose including the ones that make the electrical
connection heading inside the trap. I took the connections apart, cleaned
and reassembled. I did not open up the traps to look inside. The lower
traps were more loose than the upper ones. I'm considering putting some RTV
on the screw heads with the inductor wire under them when done.
I'm in the process of tuning now. 2:1 bandwidths are listed below.
10M 2:1 or better across the entire band.
12M. 2:1 or better across the entire band.
15M 21.10 - 21.45
17M 18.06 - 18.15 (will raise to include phone portion)
20M 14.12 - 14.30 (will raise to include all of phone)
30M 2:1 or better across the band.
40M Lowest SWR of 2.6 @ 7.225. 3:1 bandwitdth is 7.18 - 7.28. No real
dip in SWR here to figure out which way to adjust. Hopefully, while I'm
tinkering with the lower freq bands this one will get better or at least
give me an indication of which way to adjust it.
Any comments or suggestions?
Bob
-----Original Message-----
From: ValErwin@aol.com <ValErwin@aol.com>
To: N2SCJ@msn.com <N2SCJ@msn.com>
To: <towertalk@contesting.com>
Date: Wednesday, October 20, 1999 7:25 AM
Subject: Re: [TowerTalk] R-7000 Problem
>Bob:
>
>Yes and No! I cannot verify for sure what I found inside the trap(s) such
>as spiders/dust, etc. was causing a problem. What I found was that one end
>of the traps (2 each) were pop-riveted inside the trap to the inner Al
tube.
>In two cases, I found that the pop-rivets were not tight and I could move
the
>wire around. There was however no evidence of arching so who knows? I
didn't
>take a chance, I used an automatic center punch to work around each rivet
and
>tighten them up. It worked very well as the rivets were pretty soft. On
>the coil ends where the upper and lower coils attached to the Al tube, it
was
>very evident that some of those had loosened up as there was evidence of
>arcing. To see the top screws, you will have to remove the rubber caps --
>
>Val
>W5PUT
>
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