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ABOUT 2 METERS INFO FOR NEW HAMS
(and some of you seasoned ops too!)
What to expect on the 2 Meter Ham
Band
Probably the
most popular ham band in use today is the 2 meter
band. Virtually every ham, young and old, has this band in his or
her shack. The primary focus of ham radio operation on this band is
using FM (frequency modulation). In addition, most who use this band
do it in the area of the band set aside for repeater operations
and it is very
popular with new hams holding a Technician license!
The 2
meter band covers from 144 to 148 mhz. It is easily received by most
scanners. It is a VHF (very high frequency) band and has the
advantage of having very small antennas and being
able to achieve high gain from them, even on a city lot.
For
those of you not familiar with repeaters, I will provide a brief
explanation of their operation. These consist of a transmitter and
receiver, usually located at a very high point in the average
terrain with a gain type antenna mounted as high on a tower as is
possible. Since vhf radio signals are mostly "line of site", the
repeater site's high location enables the equipment to "see" farther
than it would if it was located at ground level. This set up
allows them to receive weaker signals, such as from a handy talkie,
and rebroadcast them through the transmitter and high antenna at the
repeater site. This effectively gives you the same or greater
range as if you were sitting on the hill using your own equipment!
On the 2 meter band, the input and output frequencies of the
repeater are separated by a spacing of 600 khz. Which can be either
plus or minus the repeater output frequency. Usually everything is
minus 600 khz. Up to 147 mhz. Where it changes to plus 600 khz. In
other words you transmit on one frequency ( the INPUT )...the
repeater hears it....and repeats it on a different (OUTPUT)
frequency. See more about
repeaters here. If you
want to listen to the repeaters, program your scanner to the OUTPUT
frequency of the repeater. In most areas there will be lots of
repeaters from which to choose.
All FM work is done with
vertically polarized antennas because they are much easier to design
and build for mobile and portable operation than are horizontal
ones. All SSB (single sideband) work on 2 meters is conducted for
simplex in the area of 144.200 and is horizontally polarized. Please
note the difference in polarity !
Two meter equipment is
readily available and the cost is not outrageous. For the best of
both worlds, consider a handy talkie capable of 5 watts output. You
can use this inside on a power supply and with a large outdoor
antenna array or you can use it mobile with an external antenna or
finally portable with the normally supplied "rubber
duck"antenna. Larger and more powerful mobile rigs can be
purchased new or used and either used as intended in your car,
truck, van, boat, etc or use them as a "base station" in your home
using a power supply. Join the fun and adventure on 2 Meter Ham
Radio! (Edited and re-written by an article from an unknown
author)
2
METER BAND PLAN 144.00-144.05 EME (CW) 144.05-144.10 General CW and weak
signals 144.10-144.20 EME and weak-signal SSB 144.200
National calling frequency 144.200-144.275 General SSB operation
144.275-144.300 Propagation beacons 144.30-144.50 New OSCAR
subband 144.50-144.60 Linear translator inputs 144.60-144.90
FM repeater inputs 144.90-145.10 Weak signal and FM simplex
(145.01,03,05,07,09 are widely used for packet) 145.10-145.20
Linear translator outputs 145.20-145.50 FM repeater outputs
145.50-145.80 Miscellaneous and experimental modes
145.80-146.00 OSCAR subband 146.01-146.37 Repeater inputs
146.40-146.58 Simplex 146.61-146.97 Repeater outputs
147.00-147.39 Repeater outputs 147.42-147.57 Simplex
147.60-147.99 Repeater inputs
Notes: The frequency
146.40 MHz is used in some areas as a repeater input. This band plan
has been proposed by the ARRL VHF-UHF Advisory
Committee.
Free Packet Radio Training
Course
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