[AMRadio] Antennas


John Coleman jc at pctechref.com
Tue Jun 22 12:28:03 EDT 2010


The other interesting thing about HiQ antennas is that the final must be
neutralized very well else it will tend go into some weird oscillations with
the slightest mistuning and may oscillator with modulation or at least have
significant phasing products causing the signal to be much wider than it
otherwise would be.  I am not sure, in the case where neutralization is
perfect, if HiQ tuning would cause phasing products with modulation near the
slope of the tuning curve or not.  It seems to me that it would, but the
attenuation of the slope may cover that up.

John 

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of D. Chester
Sent: Tuesday, June 22, 2010 10:36 AM
To: amradio at mailman.qth.net
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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