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Page Title:
Table 2-2. Frequency KHZ Switches S2 thru S6 BCD Logic |
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|  TM
11-5820-919-40-1
FREQUENCY
KHZ
SWITCHES
S2
THRU
S6
BCD
LOGIC
Output
Pin
Dial
X
8
Setting
4
2
1
0
0
0
0
0
0
0
0
1
1
0
0
1
2
0
3
0
0
1
1
4
0
1
0
0
1
0
0
5
1
6
1
1
0
0
0
1
7
1
1
0
0
0
1
8
0
1
0
1
9
1 = +12V
0=
gnd
=
normally
open;
momentarily
gnd
when
switch
is
changed
(grid) is applied to the emitters (E)
Harmonic Filter Select Signals.
of band switches Q1 thru Q3.
The 2 MHz
Filter Select signals for the 2-3 MHz,
thru 7 MHz Select signal corresponding
3-5 MHzj 5-8 MHz, 8-12 MHz, 12-20 MHz
to the selected dial setting is applied
and 20-30 MHz Bands are developed by
frequency select switches S1 and S2 and
to the appropriate band switch base (B).
selector decoder multiplexer U1 and U2.
This sets the desired band control line
on the collector (C) to ground.
The
The selector decoder logic for U1 is
emitters (E) of the 8-12 MHz and 12-20
described in table 2-3, and for U2 in
MHz band switches, Q4 and Q5, are tied
to ground and will apply a ground on
their band control line whenever an 8-11
MHz or 12-19 MHz Select signal (1=+12v)
2-46.
The emitters (E) of the 2-3 MHz,
is applied to their base.
3-5 MHz, and 5-8 MHz band switches Q1,
Q2 and Q3 are controlled by 2-7 MHZ Band
Table 2-5 lists the operating fre-
2-47.
Switch Enable from frequency select
quency of the radio set, and-lists the
switch S1. When a frequency of 2 to
selected band switch and filter select
7 MHz has been selected on the control
output for each frequency.
panel, the 2-7 MHz Band Switch Enable
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