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the primary matrix. If you already have a firm plan for how you wish to
program some or all of the channel positions, you can proceed with making
the frequency programming lines that you are sure about. If you have little or
no sure idea of how you want to set up the channel selector switch, you can
build up a simple switching system that will let you try any frequency of your
choice.
H43. If you are unsure of what frequencies to program, we suggest the
following to get started:
•
Channel 1: 223.50 MHz Simplex (national calling frequency)
•
Channel 2: One additional simplex frequency such as 223.60 MHz
•
Channel 3: Main repeater of your local radio club
•
Channel 4: One additional repeater in your area
•
Channel 12: A popular packet frequency such as 223.40 MHz
Add more channels as you become more familiar with 220 MHz band
operation in your area. You can change or delete any of these frequencies
whenever you wish.
Note: Your PC board silkscreen may show diode placements that differ from
your calculated placement. Place diodes where you have calculated their
position to be, and ignore any silkscreen that does not agree with your diode
placement.
H44a. Construct at least two diode bridges for frequency programming as
illustrated.
H44b. Install 2 or more diode bridges in the channel rows of your choice.
H45. Install programming diodes for two or more channels per the
following guide or per your own calculations or our Quick-Reference
Chart:
'X' indicates the installation of a diode in that position. Each one of these
Freq
32K
16K
(MHz)
223.50
223.40
223.70
channels also requires a diode installed at the 'Simplex' position. Before
installing diodes, please be sure that you understand the principles of binary
programming explained in detail in the first pages of this Section.
8K
4K
2K
1K
512
256
128
64
32
16
8
4
2
1
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