Topband: bottom fed antenna causing broad band signal?

[Guy Olinger K2AV]

Among the possibilities, and the first you should rule out, is that
since his improvement may have really improved his signal strength at
your place, and since coils are not at all a common culprit for such
things, you should go over your own setup with a fine tooth comb,
including seeing if the bandwidth diminishes if you insert an
attenuator in your RX path. The medical phrase is to carefully rule
out a pox in your own house.

Doing CW using SSB setups is a candidate for wide signals always
unless done just right, the same as PSK31 audio levels, etc.

I went through a period where an improvement in my 160 antenna started
shutting down my neighbor's AND MY Uverse gateways. That was in spite
of the 450 feet from the antenna to either of our houses. That was
quite the deal to get into repair, but a prime example where a
"smallish" improvement in radiated signal has a disproportionately bad
effect at a distance.

On Mon, Oct 24, 2011 at 7:10 PM, BRYON PAUL n0ah VEAL <bryonveal at msn.com> wrote:
>
> I have a good friend who has a 1/4 wave 80 foot vertical (63 feet) who decided to put a 100 foot coil to bottom feed the antenna for 160M.  Using a tuner, (no UnUN) he is resonant at 1.830 but the signal is very broad banded at 4 miles away. Originally, he started with a coil made of 50 feet of copper and was resonant at 1.890Mhz.  Any red flags with this design to warrant this problem of hearing him 30KHz wide, (10 up, 20 down) ?? On the scope, the signal looks very clean, and I only see it 3-5 Khz wide, as I would expect. Hut he is transmitting CW on LSB using CW software.  The coil is only around 2 1/2 inches wide- I am thinking larger turns would be less of a coil-  Any suggestions appreciated- this is not an antenna I understand very well but would like to get some input- The station is very clean for issues but is the coil suspect-  I think I would just gone with an Inv L....... hihi
> Please feel free to respond to n0ah at arrl.net.
>
> Paul  N0AH
>
>
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