[Antennas] Distortion problem on quad while trying to work VP6

2002年3月20日 08:18:53 -0600

Marty,
If you are using a balun on the quad, the balun may be the source of your
problems.
If baluns are run saturated as can happen with too much power, they will act as
non-linear devices and create all sorts of IMD. If they are run saturated for
a while, the composition of the core changes permanently and they can cause all
sorts of IMD even when used later with reduced power.
Of course, if you are not using a ferrite core balun on the quad, the problem
is somewhere else. I doubt seriously that power lines could be causing this
problem.
Frank Kamp
K5DKZ
Marty Blaise AG5T wrote:
> I discovered why I am not breaking any VP6 pileups (other than they are
> just so huge) - I went up band on 15 meters ssb and got into a qso and was
> told my audio had severe distortion. Troubleshooting -- I have a gemquad
> 5-band antenna up at 34 feet. Power lines behind house - they run
> north-south. Tower is aprox 50 feet from the power lines, right behind
> house (bracketed to house eave). Antenna is pointed sw, into power lines.
> That's not exactly paralle but could be close enough for problems. Could
> this be some type of interaction with the power lines? I'm going to try
> turning the antenna due south so it puts the quad at right angles with the
> power lines, then try to retune and see what happens. -- The other thing
> happening is this - you can use the tuner to get a 1-1 swr but as soon as
> you release the key when tuning, the swr needle quickly jumps all the way
> back to the right and then goes back to the left, so I'm guessing there is
> pretty bad feedback somewhere. -- I'm now trying to work the vp6 with a
> 40-meter delta loop tuned for 15 meters with 100 watts so obviously my odds
> aren't too hot right now. -- I worked XR0X on 12 meters the other day so I
> know I should be able to get a signal to VP6. Whether I can break the huge
> pileups is another story, but I'd at least like to think I did everything I
> could to get a good clean 100 watt signal in my best efforts. -- If anyone
> has any troubleshooting tips they might offer I'd be glad to hear them.
> Rather than complain about not getting a new country, I think I would like
> to concentrate on getting the most of the station setup I have available to
> me. By the way, when I switched to the delta loop I was told me signal was
> weaker, but without any distortion. (I worked Tromelin a few years ago on
> that loop on 20 meters so I know you can use alternate antennas if you give
> it a shot.)
>> Thanks. Marty Blaise, AG5T
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