|[AMRadio] Re: new antenna and matchbox a bust.|
ars.w5omr at gmail.com
Tue Jan 30 23:53:02 EST 2007
Brett gazdzinski wrote:
> You guys are mixed up.
> I had 50 feet each side on the antenna, for 80 meters,
> about 65 feet each side would be resonant (roughly), so
> I am 15 feet short.
I've found out from experience, open wire line forgives sins of the
antenna. So far, so good.
> I then had 42 feet of open wire line running down to almost
> ground level, where it went into 2 runs of RG214, each leg
> of open wire line was tied to the center conductor of each
> coax cable.
That looks ok, so far, as well.
> It had the shields soldered together, ran through a PVC pipe
> with the ground wire and other coax cables, into the basement.
Ewwww! Open wire/ladder-line/balanced line likes to be isolated. RF
could be induced into the other wires and lines. Ground loop nightmares
(my personal opinion)
> On the other hand, connecting the open wire line to the RG214,
> center and shield, into the heathkit tuner, seems to work well.
> I assume some of the open wire line acts like the missing 15 feet,
> and/or carries the bad voltage and current points, not the coax.
I suspect the latter. Regardless of the length of the open wire line,
that's still just the feed line. The load/antenna *should* still be
resonant for where you want to operate.
Again, I say that open wire line 'forgives' the sins committed on the
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