Kyodo West KG50640E FULL-DUPLEX MOBILE RADIO User Manual
Kyodo West Inc FULL-DUPLEX MOBILE RADIO Users Manual
Users Manual
SERVICE MANUAL
KYODO WEST MODEL KG506 NT
FULL-DUPLEX TRANSCEIVER
FULL BAND COVERAGE WITHOUT TUNING
MODEL KG506 FULL-DUPLEX MOBILE 2
FCC Compliance Information
THIS DEVICE COMPLIES WITH PART 90 OF THE FCC RULES. OPERATION IS
SUBJECT TO THE FOLLOWING TWO CONDITIONS. (1) THIS DEVICE MAY NOT
CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY
INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE
UNDESIRED OPERATION.
Caution: Changes or modifications to this equipment which are not approved by Kyodo
West could void the user’s authority to operate the equipment.
(a) Note: This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to part 90 of the FCC Rules. These limits are designed
to provide reasonable protection against harmful interference in a residential installation.
(b) This equipment generates uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the
following measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
—Consult the dealer or an experienced radio/TV technician for help.
(c) The provisions of paragraphs (a) and (b) of this section do not apply to digital
devices exempted from the technical standards under the provisions of §15.103.
(d) For systems incorporating several digital devices, the statement shown in paragraph
(a) or (b) of this section needs to be contained only in the instruction manual for the
main control unit.
(e) In cases where the manual is provided only in a form other than paper, such as on a
computer disk or over the Internet, the information required by this section may be
included in the manual in that alternative form, provided the user can reasonably be
expected to have the capability to access information in that form.
MODEL KG506 FULL-DUPLEX MOBILE 3
1.0 INTRODUCTION
Thank you for purchasing the KYODO WEST MODEL KG506 Full-Duplex Mobile Radio. This manual
contains information to assist you in the application and operation of the radio.
The KG506 is a building block intended for use in systems requiring a compact radio for full duplex,
repeater, link, etc. The radio is capable of both analogue and digital modulation.
The KG506 is designed to operate with an external, custom designed, control system, which may be
supplied by Kyodo West or by the customer. Kyodo West will provide engineering assistance and
technical information to assist in the design of the control system by the customer.
Use of the many features available in the radio will depend on the complexity of the control system.
2.0 FEATURES & PRODUCT DESCRIPTION
2.1 Standard Inclusions
The KG506 transceiver is supplied complete with the following items:
KG506 transceiver
DC Supply Cable with Fuse and Plug
Operators Manual
Spare Fuse
Two Magnetic Keys
Mounting Plate with Hardware
2.2 Features
Designed for use with external control system
Simplex or two frequency Duplex operation
Programmable with a PC computer
Up to 64 Channels
Optional Internal Duplexer
All UHF Frequency Bands from 406 to 500 MHz
Transmit Time Limiter to prevent channel jamming
Channel selectable High / Low power
CTCSS/DCS on a per channel basis
Rugged Housing
Heavy gauge mounting plate with key lock
Step-Up VCO Voltage for Superior Selectivity
Low Stand-by Current is ideal for Solar Installations
Watch Dog Timer
2.3 Product Description
The Kyodo West KG506 transceiver represents a great advance on the previous rugged & time proven
KG106 transceiver. The radio consists of separate “base station quality” modules all housed within one
rugged, compact mobile cabinet. The receiver, the transmitter, and the PA Unit are each enclosed within
their own diecast housings that are directly mounted to the main chassis. A full-featured logic module
controls all parameters of the radio under the control of a microprocessor. The RF Power Output is
programmable to HIGH or LOW power by channel and provides 15 to 30 Watts adjustable. The CTCSS
and DCS modules support all EIA tones, which may be set on a per channel basis during radio
programming.
The KG506 is supplied with TX and RX antenna ports to allow connection to an external duplexer or
feeder cables. Space is provided inside the housing for an antenna relay or mobile type 6-cavity duplexer.
The KG506 is a building block intended for use in systems requiring a compact radio for full duplex,
repeater, link, etc. The radio is capable of both analogue and digital modulation.
MODEL KG506 FULL-DUPLEX MOBILE 4
2.4 Front Panel Features
Beginning at the top left corner and moving clockwise, the front panel includes the following:
1. UHF Type connector for the Antenna / Transmitter (optional type “N”)
LEDs to indicate: A=POWER, B=BUSY, C=TRANSMIT, D=ALARM, and E=REPEAT MODE
2. Miniature jack for speaker audio output
3. BNC Connector for the Receiver
4. DC Power Connector
5. 37 position D sub connector for interface to the external control system
6. 9 position D sub connector for connection to a PC for programming
7. Model Number / FCC Label
2.5 Indicator Functions
A POWER On LED will illuminate Green whenever power is applied to the radio.
B BUSY Mode LED will illuminate Green whenever the radio receives a signal.
C TRANSMIT Mode LED will illuminate in Red whenever the radio is transmitting.
D ALARM Mode LED will flash Amber whenever the radio detects an alarm such as a program
problem, 3dB reduction in power output or high VSWR.
E REPEATER Mode LED will illuminate in Yellow when the selected channel has been
programmed for Repeater operation.
1 32
4
7
6 5
A B C E D
MODEL KG506 FULL-DUPLEX MOBILE 5
3.0 OPERATION
3.1 Installation and Programming
KG506 can be installed to operate as Fixed Station, mobile or transportable applications. The antenna(s)
used for base stations must be fixed-mounted on outdoor permanent structures. RF exposure is
addressed at the time of licensing, as required by the responsible FCC Bureau(s), including antenna co-
location requirements. For all applications, follow the precautions below.
DO NOT transmit if someone is within 0.87 meters of the radio antenna.
DO NOT press the transmit switch unless you actually want to transmit.
DO NOT allow children to play with any radio equipment containing a transmitter.
DO NOT operate the radio near unshielded electrical blasting caps.
DO NOT operate the radio in an explosive atmosphere unless the radio is specifically approved for such
use.
DO NOT operate the radio in a vehicle while refuelling.
DO NOT install any fixed (base station) antenna in a location such that it may be approached casually by
non-technical personnel.
The KG506 must be programmed before it will operate correctly. This is best done by the equipment
supplier or a competent radio engineer. They will require a copy of the FCC station license, correct
programming kit and a PC. Complete programming instructions are provided with the kit. If a duplexer is
used, please observe the maximum frequency spread permitted by the duplexer notches.
It is important that the KG506 be correctly installed at its working location. Due to the custom nature of
each installation, it is recommended that this be done by a competent radio engineer or technician
employed by the purchasing agency.
As a minimum, it is necessary to:
Securely attach the mounting plate to the desired location.
Connect the DC Input power lead to a suitable 13.8 Volt Regulated DC Power supply that has sufficient
capacity. (Ensure that the DC Polarity is correct, otherwise the fuse will blow).
Connect the antenna feed line(s). (Check that the VSWR of the antenna system is acceptable).
Connect the Control System to the 37 pin sub D connector.
3.2 Basic Operation
Note that controls and functions will vary with different control systems and with programming.
3.3 Switch On
Switch the Power Supply "ON” , the POWER indicator should illuminate.
Adjust the Volume Setting
Rotate the Volume Knob clockwise until the audio level from the speaker is suitable.
3.4 Select the Channel
3.5 Receiving
You should now be able to hear any radio traffic that occurs on channel. It may be necessary to readjust
the Volume setting to suit your listening requirements.
3.6 Transmitting
Depending on the legal requirements in your country and the operating requirements within your
organization, it may be necessary to announce your Call Sign, and will probably be necessary to
announce the Call Sign of the party you are calling at the start of your transmission.
MODEL KG506 FULL-DUPLEX MOBILE 6
Press the PTT switch before beginning to speak. When transmitting, it is necessary to hold the
microphone about 75mm (3") from your mouth and speak clearly into the front of the microphone.
4. CIRCUIT DESCRIPTION / RECEIVER (refer to Schematic # 2A-SA0137-3)
4.1 RF section
An incoming signal is fed to pre-selector filters and amplified by Q861 and then fed to post-selector filters.
The RF filters are tuned by varactors D862 thru D866 based on a control voltage derived from the VCO.
The output of the RF section feeds the balanced mixer, consisting of IC811 and T801 which produces
48.5MHz (VHF) or 73.35 MHz (UHF) by injection from the 1st local oscillator signal provided by the RX
VCO.
4.2 IF & Audio Sections (refer to Schematic # 3A-SA0139-4)
The output signal from the balanced mixer, now the High IF signal, is fed to the crystal filters XF801, and
then amplified by Q810. The signal is then fed to the IF Unit. This module contains additional filters
XF001 / 2, amplifier Q001, XF003. The High IF then passes into 2nd IF processor IC (IC001). The 2nd
local crystal oscillator signal is generated by X001 (48.045 MHz VHF or 72.895 MHz UHF) and fed to
IC001 to produce the 2nd (Low IF) signal of 455 KHz. IC001 amplifies and detects the 455 Low IF 2nd
local signal to produce an audio signal. The audio signal is processed by other components to derive the
discriminator audio, the squelch and busy signals.
The audio passes to the main receiver board, amplified and buffered by IC802 and out to the
audio processor IC (IC3) located on the Logic Unit. IC3 provides band-pass and de-emphasis functions
and passes the processed audio to IC16, line amplifier and IC22, Audio PA.
IC16 provides internal repeat audio and external line-level (0 dBm) audio for interfacing external devices.
IC22 provides audio to the speaker jack.
4.3 RX VCO Section (refer to Schematic # 3A-SA0010-7)
The oscillator circuit formed by Q301 and associated components produces the 1st local signal Rx
frequency minus 48.5MHz, VHF or Rx frequency minus 73.35MHz, UHF. The frequency of the oscillator
is controlled by a signal input from the PLL, (see below) which is applied to varactors D303/304. The
signal is amplified by buffer amplifier Q302, IC301 and Q303. The output signal is fed to the balanced
mixer in the receiver RF section. A sample of the frequency is also sent to the PLL. Transistors Q304/ 5/ 6
perform switching and regulating functions.
4.4 RX PLL Section (part of schematic 2A-SA0137-3 receiver)
The PLL IC101 contains a pre-scaler and frequency dividers to divide both the VCO frequency and the
local reference 12.0 MHz oscillator TCXO801, to a common reference frequency. These signals are
compared by a phase detector to produce a VCO control signal. This control signal is fed to the charge
pump, consisting of Q805, Q806 AND Q807, then to LPF IC808 and on to the VCO. The supply voltage of
the charge pump is multiplied by IC102 (approx. 15V) to achieve greater S/N ratio. The frequency
dividers are controlled by data from the Logic Unit to determine receiver operating frequency.
5.0 CIRCUIT DESCRIPTION / TRANSMITTER (refer to Schematic # 2A-SA0138-1)
5.1 TX VCO section (refer to Schematic # 3A SA0012-6)
The oscillator circuit formed by Q301 and associated components produces the final carrier signal. The
frequency of the oscillator is controlled by a signal input from the PLL, (see below) which is applied to
varactors D303/304. The oscillator signal is amplified by buffer amplifier Q302, IC301 and Q303. The
output signal is fed to the TX (driver) Unit for further amplification. A sample of the frequency is also sent
to the PLL. The modulation is applied to varactors D301 and D302. Transistors Q304/ 5/ 6 perform
switching and regulating functions.
MODEL KG506 FULL-DUPLEX MOBILE 7
5.2 TX PLL section
The PLL IC101 contains a pre-scaler and frequency dividers to divide both the VCO frequency and the
local 12.0 MHz oscillator, OCXO201, to a common reference frequency. These signals are compared by
a phase detector to produce a VCO control signal. This control signal is fed to the charge pump,
consisting of Q205, Q208 and Q209, and fed to the LPF IC209 and on to the VCO. The supply voltage of
the charge pump is multiplied by IC210 (approx. 15V) to achieve greater S/N ratio. The frequency dividers
are controlled by data from the Logic Unit to determine transmitter operating frequency
5.3 Modulator Section
The modulation signal is fed to both VCO and the reference oscillator (OCXO201). This permits a very
flat modulation characteristic against low frequency (DC). This also permits operation with true digital
signals such as Digital Coded Squelch.
5.4 TX Unit (Driver) Section
The VCO signal is amplified by Q211 to the proper level to drive the PA Module VIA CN201.
5.5 PA Section
The signal from driver stage is amplified by Power Module, PM501 up to 30W output power. The signal is
then fed to a balanced line to detect forward and reverse power, then on to the LPF to eliminate
harmonics and spurious frequencies. An APC (Automatic Power Control) circuit stabilizes the output
power at the set level. The circuit also protects the PA from excess reverse power caused by mis-match
of the antenna. An alarm circuit signals if output power drops below a preset level or when SWR exceeds
a preset level. All parameters are adjustable.
6.0 CIRCUIT DESCRIPTION / LOGIC UNIT (refer to Schematic # 2A-SE0056-6)
6.1 Microprocessor (CPU)
CPU, IC1, uPD78F0058Y, an 8-bit processor, has 60K flash memory and 2K RAM inside. This CPU
controls all functions of the KG506 including all software controls and processing programmed data for
frequencies, tones, etc. A flash memory permits ON-BOARD-UP-GRADE when new software is
released.
6.2 EE ROM section
IC7 is the 64kbit EEROM. This IC contains all data for channel parameters.
6.3 Audio processor section
IC2 and IC3 control all audio processing and encode/decode CTCSS tones for the transmitter and
receiver.
6.4 LED display section (front panel of radio)
The LED’s indicate each mode of operation of the KG506 as follows:
POWER, BUSY, TRANSMIT, ALARM, REPEATER.
6.5 Audio amplifier section
IC22 provides 5 W of audio power to drive 4 ohm external speaker. Input to the amplifier comes from
either the normal receiver audio path controlled by FVR7, or from an external volume control via C68 and
FVR8.
6.6 Control Interface Connector
Control interface is provided by CN10, a Sub D, 25 or 37 pin female connector on the front panel of the
unit. All I/O required for the operation and control of the radio is available through this connector. The
following list has information regarding pin-out of the 25 pins provided on the on the logic board itself.
MODEL KG506 FULL-DUPLEX MOBILE 8
These pins may be hard-wired to a 37 pin connector which lends itself to customer supplied control
systems or may be terminated in an optional 25 pin connector. The 25 pin option is the most versatile
with a full set of control features. Pin-Out for both the 25 pin and 37 pin connectors is provided below.
Interface Pin-Out, 25 pin (refer to the bottom of Schematic # 2A-SE0056-6)
Pin # Function Comments
1 CH0 External channel select data See note 1 below
2 CH1 External channel select data
3 CH2 External channel select data
4 CH3 External channel select data
5 CH4 External channel select data
6 CH5 External channel select data
7 Ground Chassis ground
8 RSSI Receive Signal Strength Indication: varies from 0.5 V to 3.2 V as
signal increases from 0 to saturation.
9 Disc. Out Discriminator wide band audio output: 1.2V p-p @ 1000 Hz, 70%
Modulation
10 SQ Control Connects to external squelch control.
11 Busy Indicates that a signal is being received: switches from near 0V (logic low) for
no signal to near 5V (logic high) when squelch opens.
12 Mute (RX) Mutes receiver audio when connected to ground.
13 Mod 1 Microphone audio or FSK data input: 50 mV for 70% modulation.
14 Ground Chassis ground
15 PTT Keys transmitter when connected to ground.
16 Mod 2 Digital data input: binary data, TTL level (NOT FSK).
17 Simplex No function
18 Error Indicates error / alarm condition: alternates between 0 and 5V
19. Decode No function
20 RX audio 1 Provides 0 dBm (variable) output. See note 2 below
21 RX audio 2 Provides 0 dBm (variable) output. See note 2 below
22 TX Out No function
23 Ext Pwr Sw External control of 12VDC power to the radio. Normally at 5V, turns
radio on when connected to ground. Usually hard-wired to ground.
24 VR Bias to external volume control.
25 +12V 12V output to power accessories up to 500 mA.
Note 1 Pins 1 thru 6 will accept 6 digit binary inputs to select the channels 1 thru 64.
Pin 1 is the least significant digit.
Pins 6 5 4 3 2 1
All lines must be held low for channel 1. 000000 = channel 1
(Binary number is channel number minus 1) 000110 = channel 7
111111 = channel 64
000001 = channel 2
Note 2 Either pin 21 or 22 will provide unbalanced output of -6 dBm @ 300 Ohms. If both are used,
a balanced 0 dBm output is available (do not ground either side). Level is adjusted by control FVR6 on
the Logic Unit.
MODEL KG506 FULL-DUPLEX MOBILE 9
Interface Pin-Out, 37 pin (refer to Schematic # 2A-SE0056-6 and interface PC Board drawings)
This option is designed for use in control systems mainly used in the USA. Not all control features of the
25 pin model are available on the 37 pin version.
Provided along with this option is an internal Interface PC Board to more easily match the control system.
This PCB will be discussed below.
Pin # Function Comments
1 CH4 data External channel select data See note 1 below
2 CH5 data External channel select data
3 NC
4 NC
5 NC
6 NC
7 NC
8 NC
9 NC
10 NC
11 NC
12 Squelch To external or internal squelch control on Interface PCB.
13 RX Line Line level audio out to volume control, adjustable by FVR6.
14 Speaker 5 Watt, 4 Ohm speaker output with pin 19 (balanced, do not ground).
15 PTT Keys transmitter when connected to ground.
16 NC
17 NC
18 Ground
19. Speaker 5 Watt, 4 Ohm speaker output with pin 14 (balanced, do not ground).
20 CH3 data External channel select data
21 CH2 data External channel select data
22 CH1 data External channel select data
23 CH0 data External channel select data
24 NC
25 NC
26 Audio Audio return from external volume control to internal Audio PA.
27 NC
28 NC
29 NC
30 NC
31 NC
32 TX FSK FSK Data input (may be combined with audio on pin 33)
33 TX Audio Voice modulation input
34 Ground Audio Ground
35 NC
36 +12V (13/6) 12V at up to 500 mA for accessories, Do not use as DC power input.
37 NC
Note 1 Pins 23, 22, 21, 20, 1, 2 (CH0 thru CH5 data line inputs) will accept binary input to select
channels 1 thru 64. Unless requested otherwise, only 3 lines will be connected to permit selection of up to
8 channels.
Pin 23 is the least significant digit. Logic is 0 or 12 V.
All lines must be held low for channel 1. 000000 = channel 1
000001 = channel 2
(Binary number is channel number minus 1) 000111 = channel 8
MODEL KG506 FULL-DUPLEX MOBILE 10
Interface PC Board (refer to drawings of Interface PC Board)
This board provides logic level matching and adjustment for the following:
Adjustment of transmitter modulation, typical input is 0.5V p-p.
Squelch control.
Receiver maximum audio output control, usually set for 5 W (12.5V p-p)
Squelch Disable allows opening the squelch from an external control switch
Channel-select logic conversion from 12 V external logic to the radio’s 5V logic.
7.0 ALIGNMENT and ADJUSTMENT PROCEDURES
7.1 RECEIVER
7.1.1 BPF-101 and BPF-102, RF Alignment
These adjustments have been performed at the factory and do not require field adjustment.
7.1.2 VCO alignment
The VCO has been adjusted at the factory to cover full bandwidth and requires no field adjustment.
Other control adjustments will be covered below with the Logic Unit.
7.2 TRANSMITTER
There are no RF tuning adjustments for the transmitter. It is a broadband circuit.
The following adjustments will properly adjust the other parameters of the transmitter.
7.2.1 FVR201 adjustment
This potentiometer determines the modulation balance. Carefully align this potentiometer to obtain equal
deviation on the lowest and the highest RF frequency programmed into the transmitter (not required for
normal frequency spreads of up to 5 MHz).
7.2.2 FVR202 adjustment
This potentiometer determines the low frequency (below 300Hz) deviation.
When CTCSS or DCS are used, it is necessary to adjust to have enough deviation at low frequency. A
good test is to adjust for flat tops on low frequency (below 200 Hz) square wave.
7.2.3 FVR203 adjustment
This potentiometer sets the maximum deviation, normally set below 2.5 KHz.
7.2.4 FVR204 adjustment
Part of power control. Adjust the transmitter output power to 30 W or less.
7.2.5 VCO adjustment
The VCO has been adjusted at the factory to cover full bandwidth and requires no field adjustment.
7.3 POWER AMPLIFIER
7.3.1 FVR501, Reverse Power Sensitivity
Terminate KG506 with 50 ohm load rated at 100W or more and adjust this potentiometer for minimum
voltage at TP-502.
MODEL KG506 FULL-DUPLEX MOBILE 11
7.3.2 FVR502, Reverse Power Level
This potentiometer sets the SWR alarm threshold when the transmitter is terminated with 50 Ohm load.
Set just slightly past the alarm trip point. Note that there is an LED on the PA PCB for convenience in
monitoring the alarm.
7.3.3 FVR503, Low Power Alarm Set
Adjust this potentiometer for the low power alarm threshold, usually –3dB (½ the high power setting).
Turn power down to 12 watts (using FVR3 on the logic board, then adjust FVR503 for alarm to trigger.
Then readjust power to 25 / 30 Watts.
7.3.4 FVR504 Maximum Power Limit
Adjust for maximum desired power output, usually 25 W or lower but not over 30 W. This should be done
with FVR3 (on logic board) set for maximum power.
7.4 Logic Unit
Note: some adjustments are repeated here for clarity.
Control locations are described with radio control panel facing you.
7.4.1 FVR1 adjustment
Not used.
7.4.2 FVR2 adjustment (1 inch right of IC3)
Adjusts the transmitter deviation level when the KG506 used as a repeater. Set to 1.75 KHz modulation
with receiver receiving a signal with modulation of 1.75 KHz at 1000Hz.
7.4.3 FVR3 adjustment (along top right edge)
Adjusts High Power level, usually set to 25 W. Will not exceed level set in Step 7.3.4.
7.4.4 FVR4 adjustment (near FVR3)
Adjusts Low Power level when program calls for low power. Usually set to 15 W.
7.4.5 FVR5 adjustment (near receiver ribbon connector)
Internal receiver Squelch range control, adjust to 1/2 rotation and adjust squelch control for threshold.
7.4.6 FVR6 adjustment (lower left corner of board near electrolytic cap)
Adjusts receiver line level output, measured at pin 13 of the 37 pin connector, usually set to 4.5 V p-p but
may vary with different systems.
7.4.7 FVR7 adjustment (lower left corner of board near regulator IC)
Internal volume balance control, set to max CW.
7.4.8 FVR8 adjustment (lower left corner near speaker jack)
Used for auxiliary audio input. Set to max CCW
7.4.9 FVC1 adjustment (under left-center edge of interface board)
This is to shift the CPU clock frequency to eliminate beat interference (birdies) with certain carrier
frequencies.
7.4.10 FVC2 adjustment (under lower right edge of interface board)
This is to shift clock frequency for IC2 and IC3 to eliminate beat interference (birdies) with certain carrier
frequencies.
MODEL KG506 FULL-DUPLEX MOBILE 12
8.0 SPECIFICATIONS
8.1 General
Frequency Range
Version SA 300 - 335MHz
Version A 335 - 370MHz
Version B 365 - 400MHz
Version C 400 - 435MHz
Version DS 420 - 455MHz
Version D 440 - 475MHz
Version E 465 - 500MHz
Version F 485 - 520MHz
Number of Channels 8 or 64 channels (observe duplexer limitations)
Channel Spacing 12.5 KHz
Operation Mode Simplex, Semi Duplex, Full Duplex, Repeater
Antenna Impedance 50 ohm
Power Requirement DC 13.6V Regulated, negative ground )
Consumption 8 amperes or less
Environmental Conditions -30 to +60 degrees C, 95% humidity @35C
Dimensions 14 in L (357 mm) x 8.75 in W (222 mm x 3.44 in H (87mm)
Weight 14.5 lb (6.6 Kg)
8.2 Transmitter
Output Power 25W continuous, 30W max.
Switchable Bandwidth Full sub-band
Frequency Deviation 2.5 KHz
Frequency Stability +/- 1.5 ppm
Frequency Response Within +1, -3dB, 300-3000Hz @1KHz ref.
Signal to Noise Ratio 45 dB or more @1KHz 70% mod.
Modulation Distortion 3% or less
Spurious & Harmonics 0.25uW or less
8.3 Receiver
Switchable Bandwidth Complete sub-band
High (1st) IF Frequency 48.5 MHz VHF, 73.35 MHz UHF
Low (2nd) IF Frequency 455 KHz
Frequency Stability 1.5 PPM
Sensitivity 0.4uV or less for 20dB N.Q. / 0.3uV for 12dB SINAD
Squelch Sensitivity 0.25uV or less
Selectivity 70dB or more
Blocking 90dB or more
Intermodulation 70dB or more
Spurious Response 70dB or more
AF Response Within +1, -3dB, 300-3000Hz @1KHz ref.
AF Distortion 5% or less @1KHz 70% mod
Signal to Noise Ratio 45 dB or more @1KHz 70% mod.
8.4 Internal Duplexer (Optional)
Mobile type, 6 cavity Min isolation, 70 dB, max insertion loss, 1.7 dB
Typical size 8.5” long x 6.25“ wide x 1.3“ high
Note: Height must not exceed 1.3” .