Shakespeare Electronic GBS 2500A Operation Manual
23 Channel
Citizens Band Transceiver
Operation Manual
GENERAL
DESCRIPTION ®
This unit is a transceiver employing a frequency synthesizer circuit to provide 3 crystalcontrolled transmit and receive channels in the 27 MHz citizens band. This unit is an all solid state
and high capacity transceiver. It is designed for mobile operation such as automobiles, boats or
ships, and its standard power supply is DC 12V.
SPECIFICATIONS
GENERAL
* Frequency Range
26.965 to 27.255 MHz
Channels
23
Channel Composition
PLL synthesizer type
Frequency Tolerance
0.005%
* Operating Temperature Range
-30°C to + 50°C
* Polarity of Power Supply
Negative or positive ground DC 13.8V
Size
6" W x 2" H x 82/3" D
TRANSMITTER
RF Power output
4 watt
'Modulation Capability
100%
* Output Impedance
50 or 51 ohm
*
Spurious and Harmonics
-50 dB
RECEIVER
' Sensitivity
0.7 u Vfor 10dBS+N/N
Selectivity
-6 dB Bandwidth 6kHz
-60 dB Bandwidth 20kHz
'Image Rejection
at least 60 dB
'Spurious Response
less than -50 dB
'IF Frequency
1st IF: 10.695 MHz
2nd IF: 455 kHz
Squelch
0.5 u V to 1000 u V
* AGC Figure of Merit
75 dB
Audio Output
3 watt (8 ohm)
13,
(D,
IN LINE FUSE(2A)
BLACK
OPERATING CONTROLS AND FEATURES
1.
Microphone socket: Four-pin socket for Push-to-Talk dynamic microphone with curl cord and
dependable screw-on connector.
2.
VOL.: This control varies the sound output from the speaker. Also incorporates an
"ON — OFF" power switch at the extreme counter-clockwise position.
3.
SQUELCH: This control is used to "quiet" the receiver during no-signal conditions. Turn fully
counter-clockwise then slowly clockwise until the receiver noise disappears. Any signal to be
received must now be slightly stronger than the average receiver noise. Further clockwise
rotation will increase the threshold level which a signal must overcome in order to be heard.
4.
RF Gain: When close-in -station overloads your speaker the RF switch allows you to reduce the
load on your speaker.
5.
Channel selector: This switch selects any one of the Citizens Band channels.
6.
S RF P Meter: This meter is automatically switched to indicate
incoming
signal strength in
the receive mode and relative RF power output in the transmit mode. "S" scale to be adjusted
at "S9" on input 100 u V.
7.
ANL: This switch is activated whenever it is desired to reduce ignition noise or other
man-made impulse noise.
8.
PA/CB: CB position provides normal CB operations. PA position lets you use transceiver as
PA amplifier with external speaker connected to PHONE jack. (speaker impedance 8 ohm)
9.
INTERNAL/EXTERNAL SPKR. In UP position built-in (internal) speaker operates. In EXT
position the external speiker, when plugged into the EXT jack (10), is activated.
10.
EXT. SPKR.: Jack for connection of external devices such as headphone or speaker.
11.
PA SPKR.: Special speaker jack for Loud Hailer. When in PA speaker position, internal
speaker is disconnected.
12.
ANTENNA: For antenna lead-in cable with matching PL-259 connector.
13.
POWER line: Power supply available for DC operation only. Red cord is hot (plus) and black is
cold (minus).
14.
TX Light : It operates when the unit is in the transmit position.
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