My suggestion is throw the Diamond antenna off the tower and put
something up worthwhile. Those things are useless imo.
Scott
N1CX
At 10:23 PM 4/20/2014, Roger (K8RI) on TT wrote:
I think that I've lost a ground. The SWR has gone sky high on the
Diamond 144/440 repeater antenna. As the antenna is only rated at
200 watts the matching network is pretty light duty. Also, the
AV640 which originally was very easy to match, is now difficult to
find the resonant points.
I believe this is due to a DC bias through the matching transformers
putting the cores into, or near saturation.
I keep using, I think and I believe as I really don't know, but it
sounds logical.
The new AV840 just arrived and I need to work on the Diamond
antenna, so I need to find the problem before going any farther with
the antennas.
I had been talking to N8ERF on the repeater when he mentioned I was
getting noisy. I immediately stopped transmitting, came in, got the
SWR bridge, took it to the shop and put it in the line. The SWR had
gone from 1.2:1, to off scale. I think the finals are OK. I
certainly hope so.
So tomorrow, I'm going to add one of those grounding plates that tie
everything together and to the station ground. The space behind the
desk out there is a mass of wire, that could be neatened up, so I
can see at a glance what is connected to what.
That and all the projects need to be finished up so I have an
organized shop in which to work.
Any thoughts on the grounding would be appreciated
73
Roger (K8RI)
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