[aprssig] Base antennas and a couple other questions
kb8uih at sbcglobal.net
Sat Dec 11 15:47:23 CST 2004
A recive only or 99% receive antenna for APRS that
works great is a copper cactus. Not heavy and easy to
use or stow for transport. Cost less than $15
depending on component costs. No need to spend mega
bucks for an antenna that isn't needed for TX.
Now, putting rigs in boxes for transport and use is a
good idea. I have two set up for use for ARES. Holes
for an SO-239 bulkhead barrel connector for antenna
and a square hole for a power connection make the rigs
inside self contained and protected. Just make sure
you have room inside for air circulation around the
Shielding them from commercial RF frequencies needs a
notch of some kind or other RF filter that can be
purchased commercially to place between the TXRX and
its antenna. Anywhere from $40-$100 range depending
on who makes them. DCI is one brand and their ads are
in CQ or and QST.
An antenna for the portable repeater rigs needs to be
a good one for the voice comms links. Diamond X-50 is
a 4.5' fiberglass stick that mounts with its own base
and two large aluminum u bolts for large diameter
pipes(you can make a smaller pipe by using mast
available at Radio Shack or an appliance store that
still sells TV antennas). This antenna should be
available for about $95 depending on who you buy it
from. Dual banded for 2M and 440. Has its own SO-239
connector on the base. This antenna may have a
commercial equivalent for your 155mhz use.
Consult Diamond or Comet/Maldol for their prices. I
hate to suggest MFJ but they may have something to use
also for 2M/440 as well.
Commercial antennas like stationmasters (Decibel) will
be better for gain but will bust your budget wide
open. I won't suggest them for this application
unless you get a grant from someone.
--- Josh Keller <jeepin95 at comcast.net> wrote:
> Seeing as how I am the most familiar with radios in
> my SAR group I have
> been assigned to come up with a few different things
> they want to
> purchase. I'm fairly new to all this radio stuff so
> I don't know a whole
> lot about it, which is why I'm asking here.
< C U T >
More information about the aprssig