[Hallicrafters] 40 m antenna used on 80 m - what to expect?

[Jim Brannigan]

At one time I was feeding a shortened non-resonant dipole on 80m....
Open wire line, balanced tuner (B&W plug-ins) big insulators thru the wall, 
sparkplug arrestors, a classic Handbook setup....
The transmitter fed about 600 Watts to the tuner.
At some point a rose bush decided to use the open wire line as a trellis.
After experiencing some odd tuning behavior I went out side and discovered a 
fried rose bush!!
The branches on the open wire line were burned thru!!!

I guess I found the Hi-voltage node on the feedline....

Jim

>> Oh my poor achin' pi-net... the blind are leadin'
> the freakin' blind.
>
>> I feel like I'm watchin' an episode of "Home
> Improveement" with Tim-the-Tool-Man.
>
> ---------------------
>
>> An 80 meter dipole could be moderately effective on
> 30 meters, maybe 17 meters, 12 meters; but it won't
> work on 40 because that is the second harmonic.  It
> won't work on 20 either, because that's the fourth
> harmonic (an EVEN harmonic); nor will it work on 15 or
> 10 because those are also even harmonics.
>
>> No coax fed antenna is going to radiate well -- if
> at all --at a band lower than the one it's cut for.
> If it ever did, it certainly didn't work
> well!
>
>> Pu-LEEZE get some knowledge.  Life is a whole lot
> more fun when you are informed.  And your final
> tubeage will last a LOT longer; plus you won't melt
> the poly-insulation out of your tank coils.
>
> 73
>
> Mike
> WA4DLF
>
>
> ______________________________________________________________