[AMRadio] Antennas


Bernie Doran qedconsultants at embarqmail.com
Tue Jun 22 12:09:10 EDT 2010


well Don, The good thing about that is it must be fairly efficient.  That 
thing is probably only a few ohms R and a bunch of x, any significant series 
r would make it wider, sort of like a 100 ft run of small coax and an SWR of 
" only 4 to 1 on 28 mc."   it could be a dead short on the antenna end.   80 
has been so noisy lately that I have about given up. Bernie W8RPW

 Original Message ----- 
From: "D. Chester" <k4kyv at charter.net>
To: <amradio at mailman.qth.net>
Sent: Tuesday, June 22, 2010 11:35 AM
Subject: Re: [AMRadio] Antennas


>> There have been some interesting cases with short loaded antennas
>> in the BC band, the bandwidth has occasionally been so narrow that the AM
>> sidebands become attenuated!  Not going to see that effect in the amateur
>> bands unless someone is running an antenna only a few feet long!!
>> Bernie W8RPW
>
> I  almost have that situation on 160m when I use my 80m dipole, fed with
> open wire line and balanced tuner.  I can move maybe +/- 5 kHz before I 
> have
> to retune.  Using that antenna set-up is like being crystal controlled,
> since I have to go down to the tower to re-set the tuner.
>
> Hopefully, by upcoming season I'll have my remote tuning system, with
> reversible DC motor, so I'll at least be able to QSY within the same band
> without a trip to t he tower.  I hope to eventually make it so I can 
> change
> bands remotely as well.
>
>
> Don k4kyv
>
>
>
>
>
>
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