[amsat-bb] Re: Easy to make, low cost omni-directional antennae

[Bill Dzurilla]

Good points, Tony.

> I wouldn't bother with a switching preamp, unless
> you're planning on 
> using the omni for transmitting (e.g. for working
> the ISS 
> repeater).  You certainly don't need a switching
> preamp to work any 
> of the Mode J birds, because the uplink is on a
> different band, and 
> you want full duplex capability if you can have it. 
> 
Of course, you can't use a receive only preamp if you
use a dual band antenna with a single feedline, or if
you want to use the 70 cm antenna for local repeaters,
for working the ISS repeater, VO-52, or AO-7 mode B,
or for any type of 70 cm transmission at all.  But if
you have an antenna that can be devoted exclusively to
70 cm reception, it will do fine and will be a lot
cheaper than a switching preamp.

73,
Bill NZ5N


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