[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [IRCA] Which Phaser?
> I have done very well with the Quantum phaser but it isn't designed for SW
> and is basically AM only. I don't intend to test and compare other phasers
> at some point for AM.
>
> Does anyone have experience with a SW phaser ? I have little interest in
SW
> except for AM //'s and am wondering if the varied skip from E aand F layer
> would make phase nulling unstable on SW ? Also, are there really that many
> channels where it would help ?
As you mentioned, the slightly varying direction from which the signals
arrive will affect the null. Directional antennas will have better overall
nulling than phasing. One simple antenna is the W8JK two element.
http://www.hard-core-dx.com/nordicdx/antenna/wire/w8jk.html
Basically two dipoles fed out of phase from each other. It's a figure 8
pattern not unlike a loop. The fact that the two symmetrical dipoles are
out of phase means the null isn't a point on a sphere or toroid shape, but
more like two spheres that touch. If the antenna is 90 degrees to the
distant station, the vertical arrival angle won't matter. The null will be
maintained.
A phaser won't have a null like that unless it creates a 180 degree phase
difference between two identical antennas. In effect, making an array
similar to the W8JK.
I haven't tried the DX Engineering phaser on SW. I don't have two
appropriate antennas at the moment.
How about the flag and similar antennas? They should also provide good
directional patterns at SW frequencies.
Craig Healy
Providence, RI
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca
Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers
For more information: http://www.ircaonline.org
To Post a message: irca@xxxxxxxxxxxxxxxx