FCC ID: PHO-CDR9150 Spread Spectrum Modular Transmitter

CDR-9150 Data Radio Module INTEGRATORS GUIDE C o y o t e D a t a C o m

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. c o m CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ TABLE OF CONTENTS General Information and Labeling Requirements.....................................3 FCC RF Exposure Statement ..................................................................4 Configuration........................................................................................6 Specifications......................................................................................14 CDR-9150 Mechanical Overview...........................................................15 Pin Definitions.....................................................................................16 Approved Antennas.............................................................................18 RS-232 Interface Board .......................................................................19 In-System Configuration......................................................................19 Hardware Timing ................................................................................23 FCC Compliance Warning and Class B Statement ..................................28 Revision B INTEGRATORS GUIDE 2 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 Data Radio General Information and Labeling Requirements This CDR-9150 is a frequency-hopping spread spectrum data transceiver operating in the 902-928 MHz ISM band. The unit is designed to operate under Part 15.247 of the FCC rules and regulations and is designed as an OEM module for integration into other products or field devices. When installed using an approved antenna, the user need only ensure that the appropriate FCC information is clearly visible on the outside of the integrated product. This label should contain one of the following phrases to be considered valid. 1. "Contains Transmitter Module FCC ID: PHO-CDR9150" or 2. "Contains FCC ID: PHO-CDR9150 For integration into products sold in Canada, the label should read as follows. Contains Transmitter Module IC: 4315A-CDR9150 The term IC: before the certification/registration number only signifies that the Industry Canada technical specifications were met. Caution: If this radio is integrated into another product, the user is responsible for complying with the external labeling requirements as directed in the FCC Rules and Regulations Part 15.19. To avoid the need to obtain additional certification, the user should only use antennas that have been tested and approved for use with this radio. The unit operates on 50 discrete frequencies within the ISM band, each frequency about 400 kHz apart. Using a frequency agile phase-locked loop synthesizer, the radio is able to scan all 50 channels and quickly acquire synchronization with a transmitting radio. The radio is connected to a host device using a 10-pin SIP header. This connection provides the radio with the required DC power source, allows it to be programmed and configured and provides all I/O lines for an asynchronous serial interface. Revision B INTEGRATORS GUIDE 3 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 DATA RADIO REGULATORY FCC RF Exposure Statement This device complies with FCC radiation exposure limits as set forth for an uncontrolled environment. When using the antennas listed below, this device should be installed and operated with a minimum separation distance of 20 cm between the radiator and your body. wave rubber whip wave mobile whip 0dB 5/8 over 5/8, 5dB center loaded mobile 5/8 wave, 3dB mobile whip Dome antenna, 0dB Low profile, tamper resistant, 0dB When using the antennas listed below, this device should be installed and operated with a minimum separation distance of 2 meters between the radiator and your body. These antennas should not be installed indoors. 5dB fiberglass monopole 6dB 3 element Yagi Revision B INTEGRATORS GUIDE 4 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 DATA RADIO CONFIGURATION Default Settings Serial Baud ............................................................................. 9600 bits/second Port......................................................................................................... UART RX buffer size .................................................................................. 190 bytes*

TX buffer size .................................................................................. 190 bytes*

CTS assert........................................................................................... 89 bytes CTS de-assert .................................................................................... 178 bytes Packet size ........................................................................................ 177 bytes Preamble bytes.................................................................................. 266 bytes TX assert.................................................................................. 177 bytes/5 mS Ack-Back retries .........................................................................................15 Ack-Back timeout ............................................................................... 200 mS Channel..........................................................................................................1 Source Address...............................................................................................1 Destination Group ...........................................................................................1 Destination Address ........................................................................................1 Ack-Back mode ......................................................................................... Off

*Factory setting; cannot be changed. Revision B INTEGRATORS GUIDE 5 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 DATA RADIO CONFIGURATION The CDR-9150 is supplied with an easy-to-use Windows98 configuration program. The configuration program allows the user to control the operation of their radio network. Installing The configuration software does not require an installation. Simply run it from the CD labeled CDR-9150 Tools or copy it onto another drive. Start the program by locating and double-clicking on the Programmer icon. This will launch the configuration program and display the screen below. Revision B INTEGRATORS GUIDE 6 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ Click on the PC Settings tab, then select which COM port will be used to connect to the data radio. As shown below, ports COM1 thru COM4 are available. This setting will be retained the next time the configuration program is run. Getting Started To configure the radio, click on the appropriate tab for the radio being configured. Then select the radio Communications Port. The default setting is for asynchronous serial mode, UART (Universal Asynchronous Receiver/Transmitter). The default baud rate is 9600 bits per second. The interface baud rate can be set to standard values between 2400 and 57600 as shown on the following page. This mode supports 8 data bits, 1 stop bit and no parity. Revision B INTEGRATORS GUIDE 7 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 Repeater Revision B INTEGRATORS GUIDE 8 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ Addressing The radio has been designed to be very versatile in its addressing functions. Each radio has its own identifier consisting of a group number and address number. The Source Group specifies which group of radios the unit being configured belongs to. The Source Address specifies the address within that group that uniquely identifies this radio. The radio will decode packets containing a Destination Group and Address matching its own. With the exception of broadcast messages, all others will be ignored. Broadcast messages are those messages where the destination address is 0 and the group is the same as the radio receiving it, or those messages where the destination address and group are both 0. When the destination group is set to 0, all radios in all groups will decode the packet. Likewise, the Destination Group specifies which group of radios the transmissions will go to. The Destination Address specifies the individual radio within that group that will receive the message. TX Hold Off Time TX Hold Off Time sets the amount of time that must elapse after the last byte to be transmitted is received by the radio before a transmit packet will be initiated. Setting this value higher will prevent numerous small packets from being sent when the transmit data is not continuous. The default setting will be adequate for most applications. Acknowledgement (Ack-Back) The CDR-9150 has powerful built-in path management features designed to make OEM integration quick and easy. Activating packet acknowledgement will virtually guarantee all data transmitted is received. Any packet transmitted by the CDR-9150 is then acknowledged by the receiving radio. If any packet is not acknowledged, the transmitting radio will resend the data. While reducing throughput, this feature also handles missed transmissions as well as performs path management, allowing full duplex communications. The Retries field specifies the number of attempts the radio will make in trying to resend unacknowledged packets. The Timeout field determines how long the radio will wait for the acknowledgement before resending. (See Hardware Timing for more information) Revision B INTEGRATORS GUIDE 9 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ Number of Repeaters The range of the CDR-9150 may be extended by using repeaters. Repeater modules receive data packets on one group code and retransmit the packet on another group code. For example, a repeater configured with group codes 3 and 4 will translate the following packets and retransmit them as follows:

A packet received with a destination group code of 3 will be received and retransmitted with a destination group of 4. A packet received with a destination group code of 4 will be received and retransmitted with a destination group of 3. This method of group code translation guarantees that data is transferred through the repeater and not directly between radios. When the CDR-9150 is in Ack-Back mode and there are repeaters in the system, the amount of time needed to receive packet acknowledgements increases. By specifying the number of repeaters in the Configuration program, this delay is calculated and the radio is updated correctly. Always set this field with the maximum number of chained repeaters in the system. Revision B INTEGRATORS GUIDE 10 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ Path Management The CDR-9150 has powerful path management tools to help ensure successful field installations. The Path Management window has two modes, Continuous and On-Sync. The Continuous mode allows the installer to look at competing signals on the radios channel and determine if there is a potential interference problem. Running in this mode for an extended period of time will show the installer the level of the strongest signal seen by the radio. The solid indicator needle indicates the current signal level being received while the dashed indicator needle shows the strongest signal received. Clicking the Stop button will reset the dashed indicator. Continuous Mode Signal Monitoring Revision B INTEGRATORS GUIDE 11 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ The On-Sync mode allows the installer to look only at radio transmissions for CDR-9150 radios. When packets are received, the transmissions current and maximum signal strength is displayed along with the packets source group code and address. This allows the installer to ensure there is adequate signal strength with enough fade margin to guarantee reliable operation. Signals in the green area are considered very reliable, those in the yellow area are marginally reliable and signals in the red area are considered not reliable. The graph will display information for as many as 16 radio addresses. As new addresses are received, they will replace the oldest ones in the graph. The last received signal is indicated by a crosshatch in the bar. Clicking on the Stop button will reset the graph information. On-Sync Signal Monitoring Revision B INTEGRATORS GUIDE 12 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ Code Upgrading The CDR-9150 has been designed for easy field upgrades. Using the RS-232 Serial Adapter board, a DR915 Programming cable, a standard Serial Configuration cable and a current version of the CDR-9150 Configuration program running on the users PC, the radio can be re-flashed with new operating code. Special customer code can also be loaded in this manner. With the radio mounted on an RS232 Serial Adapter board, connect a program upgrade cable from the programming connector, J4, on the Adapter board to the parallel port on the PC. Connect a standard DB9 male-to-female serial cable from the Adapter boards DB9, J2, and to the serial port on the PC. Power the Adapter board using the supplied 12-volt wall module connected to the Adapter boards power jack, P8. Using the CDR-9150 Configuration program, click on the Flash tab. Select the desired software version from the Software Version drop-down box and then press the Program Flash button. The Configuration program will then read the setup information from the radio, upgrade the radio code and reload the original configuration. Revision B INTEGRATORS GUIDE 13 F l a s h U p g r a d e T a b CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 Data Radio SPECIFICATIONS Overall Frequency .................................................................................... 902-928 MHz Frequency Control..................................................................... PLL Synthesizer Transport ...............................................Transparent, Point-to-Point Guaranteed Data Interface ............................................................ Asynchronous Serial, TTL Hopping Channels.........................................................................................50 Configuration.................................Windows98 Application using PC Serial Port Duty Cycle............................................................. 100% receive, 50% transmit Data Interface Rate................................. 2400,4800,9600,19.2k,56k bps (N,8,1) Temperature................................................................................ -30 to +70 C Range ....................................................up to 10 miles depending on conditions Data Encoding ..................................................................... Proprietary Method Receiver Sensitivity ..................................................................-101 dBm usable Modulation ............................................................................... Direct FM (FSK) RF Data Rate ........................................................................................ 50 kbps Data Flow Control ...............................................................Hardware using CTS Transmitter Output ............................................................................... 200mW Error Detection ................................................................................. 16 bit CRC Power Requirements Input Voltage...................................................................................8 32 VDC Input Current.....................................................................80 mA Receive Mode 800 mA Transmit Mode Regulatory United States (FCC)...........................................................CFR 15.247 Approved Canada (IC).......................................................................... RSS-210 Approved Mechanical Size................................................................................................ 2.1 x 4.25 Antenna Connector ....................................................................... Reverse SMA Revision B INTEGRATORS GUIDE 14 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 Data Radio RADIO HARDWARE INTERFACE CDR-9150 Mechanical Overview TTO Be Added Revision B INTEGRATORS GUIDE 15 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 Data Radio RADIO HARDWARE INTERFACE Pin Definitions for Connector P2 PIN 1 2 3 4 5 6 7 8 9 10 FUNCTION Ground CTS DTR Receive Data Transmit Data Reset SPI Clock SPI MISO/Fail SPI MOSI/Sending VCC PIN 1 Ground Power and signal ground for the data radio. PIN 2 CTS Clear to Send. This line will be low when the radio is ready to accept data to transmit. When the radio raises this line, the user application must cease sending data to the radio or a buffer overflow may occur resulting in a loss of data. PIN 3 DTR Data Terminal Ready. This line is used to place the radio into configuration mode. It should be held low for normal operation. PIN 4 Receive Data This is data received by the radio and sent out to the user device. The data format is a standard asynchronous stream at the user-set baud rate with one start bit (low) followed by 8 data bits and one stop bit (high). This is a TTL-level Revision B INTEGRATORS GUIDE 16 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ interface. Applications requiring RS-232 must use an appropriate interface circuit or a CDR-9150 RS-232 interface board. PIN 5 Transmit Data This is the data sent by the user device for the radio to transmit. The data format is a standard asynchronous stream at the user-set baud rate with one start bit (low) followed by 8 data bits and at least one stop bit (high). This is a TTL-level interface. Applications requiring RS-232 must use an appropriate interface circuit or a CDR-9150 RS-232 interface board. PIN 6 Reset Taking this pin low will reset the radios micro controller. For normal operation, this pin should be left open. PIN 7 SPI Clock This pin is used for updating the code in the radio. PIN 8 SPI MISO This pin indicates a failure to complete an transmission while in Ack-Back mode. This pin is also used for updating the code in the radio. PIN 9 SPI MOSI This pin indicates the radio is attempting a transmission while in Ack-Back mode. This pin is also used for updating the code in the radio. This is power to the radio. It should be 7.5 to 15 vdc. PIN 10 VCC Revision B INTEGRATORS GUIDE 17 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 Data Radio APPROVED ANTENNAS The CDR-9150 is approved for use with the following antennas:

wave rubber whip 5dB fiberglass monopole 6dB 3 element Yagi wave mobile whip 0dB 5/8 over 5/8, 5dB center loaded mobile 5/8 wave, 3dB mobile whip Dome antenna, 0dB Low profile, tamper resistant, 0dB Revision B INTEGRATORS GUIDE 18 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 Data Radio RS-232 INTERFACE BOARD The INT-9150DR-232 is a serial adapter board that allows the user to easily connect to the CDR-9150 Data Radio using a standard DB-9 serial cable. The interface board also provides visual indication of data coming from and going to the user-connected equipment. CDR-9150I-232 Interface Board Revision B INTEGRATORS GUIDE 19 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ LED Indicators Yellow indicates the radio is ready to accept data from the user-

connected equipment. Green indicates data is being sent from the radio to the user-connected equipment. Red indicates data is being sent from the user-connected equipment to the radio. DB-9 Pin Out (RS-232) PIN 1 DCD (Data Carrier Detect) is always held high by the radio. PIN 2 RD (Receive Data) is serial data from the radio to the user device. PIN 3 TD (Transmit Data) is serial data from the user device to the radio. PIN 4 DTR (Data Terminal Ready) indicates the user device is ready to send data to the radio for transmission. When this line is high, the radio will transmit any data across the RF network. When this line is low, the radio will process the data as commands. If this pin is unused it should be tied to PIN 1. PIN 5 GND (Ground) is the interface common. PIN 6 DSR (Data Set Ready) is always held high by the radio. PIN 7 RTS (Request To Send) is not connected on an RS-232 Interface board. PIN 8 CTS (Clear To Send) is used to indicate to the user device that the radio can accept more data. When this line is high, the user device is clear to send more data. When this line is low, the user device should not send data. (This line may be ignored at baud rates of 2400 and 4800 bps. The TX Packet size should be changed to 150 bytes to prevent a buffer overflow.) PIN 9 RI (Ring Indicator) is not connected on an RS-232 Interface board. Revision B INTEGRATORS GUIDE 20 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ DB-9 Pin Out (RS-485) PIN 1 Unused PIN 2 Unused PIN 3 Unused PIN 4 Unused PIN 5 GND (Ground) is the interface common. PIN 6 Unused PIN 7 RS-485-

PIN 8 Unused PIN 9 RS-485+

Power Connector Pin Out The power connector should receive 8-32 VDC at 1000 mA. The 2.5mm x 5.5mm jack is center positive. Revision B INTEGRATORS GUIDE 21 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 DATA RADIO HARDWARE TIMING Ack-Back Handshaking When configured for Ack-Back mode, the radio will attempt to resend packets that are not acknowledged as received by the destination radio. While this virtually guarantees that data will be correctly transmitted, there is still the possibility that the destination radio is unavailable. Because of this, the CDR-9150 supplies hardware indication of the success or failure of Ack-Back packets. (See Radio Hardware Interface for pin definitions) Shown below is an example of the hardware handshaking for a successful Ack-Back transmission. The TX trace identifies the actual transmission attempt and is internal to the radio. The SNDING trace is the handshake signal on Pin 9 of P2. This signal goes high when the transmit attempt is made and stays high until the acknowledgement packet is received from the destination radio. Successful Ack-Back Transmission Revision B INTEGRATORS GUIDE 22 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ Timeout If and acknowledgement is not received within the Ack-Back time, the radio will resend the packet up to the Ack-Back Retries setting. If an acknowledgment is received during one of the retries, the SNDING signal will return low, indicating a successful transmission. If there is no acknowledgement after all retry attempts, the SNDING line will return low and the FAIL line will go high to indicate a transmission failure Failed Ack-Back Transmission After 3 Retries Revision B INTEGRATORS GUIDE 23 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 DATA RADIO IN-SYSTEM CONFIGURATION The CDR-9150 may be reconfigured while in a host system. This allows the users system to change the source or destination address and group codes on-the-fly, adding great versatility to the Ack-Back delivery mode. General Structure The general structure of the protocol for programming the DR915L/LT radios is as follows:

[0xAA] [command] [checksum] [0x55]

where command consists of byte #1, byte #2, byte #3, ..., byte #n as defined below, and where the checksum is an 8-bit checksum (a simple unsigned 8-bit addition of bytes) of data bytes 1 thru n, 0x55, and where the checksum does not include the beginning 0xAA, itself, or the ending 0x55. Numbers preceded by 0x are hexadecimal. All others are decimal. The DTR pin must be raised prior to sending any commands to the radio. Once a complete command has been sent to the radio, the DTR pin should be immediately lowered. If a read command of some sort was issued, the device should be ready to receive the information immediately. If a Write Command was issued, the device must allow 250 milliseconds for the radio to reboot itself with the new values before any other commands can be issued. As bytes are sent to the radio, each byte will be immediately echoed back to the sender for confirmation that the radio received the byte. When any data is being read from the radio, the device should simply read in the data without echoing the bytes back to the radio. EEPROM values are loaded on power-up. Values written to RAM will be used until the radio loses power. Revision B INTEGRATORS GUIDE 24 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ Command Structure The format of the data bytes for sending a command to the radios is as follows:

Read command:

- 0x01 (1 byte)

- memory select (1 byte) (0 = read from EEPROM, 1 = read from RAM)

- beginning address (high byte) (1 byte)

- beginning address (low byte) (1 byte)

- number of bytes to be read (1 byte) Write Command:

- 0x02 (1 byte)

- memory select (1 byte) (0 = write to EEPROM, 1 = write to RAM)

- beginning address (high byte) (1 byte)

- beginning address (low byte) (1 byte)

- number of bytes to be written (1 byte)

- byte #1 to be written

- byte #2 to be written

- byte #3 to be written

- byte #n to be written Path Management:

-0x03 (1 byte)

-mode (1 byte) (0 = off, 1 = every 250ms & on-sync, 2 = on-sync.) This command returns a series of packets 6 bytes long. The packet structure is as follows:

-0xAA (1 byte)

-counter (high byte) (1 byte)

-counter (low byte) (1 byte)

-source group (1 byte)

-source address (1 byte)

-0x55 (1 byte) Revision B INTEGRATORS GUIDE 25 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ Read Model Command:

- 0x04 (1 byte) This command returns an ASCII string 15 bytes long. Read Software Version Command:

- 0x05 (1 byte) This command returns an ASCII string 15 bytes long. Read Serial Number Command:

- 0x06 (1 byte) This command returns 4 bytes with the least significant byte first. Addresses of Settings CAUTION!

CAUTION! The radio software performs no validation of settings. Great care should be taken when programming any of these settings. DR915 Address Map:

0x0001 = Not used 0x0002 = Tx Hold off (Valid range = 5 - 255. Default = 5.) 0x0003 = Preamble Bytes (high byte) 0x0004 = Preamble Bytes (low byte) (Valid range for the two byte value = 16 -

1000. Default = 16. A value of less than 16 will cause improper operation.) 0x0005 = Destination Group (Valid range = 0 - 255 where 0 is broadcast group.) 0x0006 = Destination Address (Valid range = 0 - 255 where 0 is broadcast address.) 0x0007 = Source Group (Valid range = 1 - 255. A value of 0 must not be used.) 0x0008 = Source Address (Valid range = 1 - 255. A value of 0 must not be used.) 0x0009 = Packet Length (Valid range = 1 - 177. Default = 177.) Revision B INTEGRATORS GUIDE 26 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ 0x000A = CTS Deassert Limit (Valid range = 1 - 178. Default = 178. This value should be greater than the CTS Assert Limit.) 0x000B = CTS Assert Limit (Valid range = 1 - 177. Default = 89. This value should be less than the CTS Deassert Limit.) 0x000C = Baud Rate (*See below for proper settings.) 0x000D = Ack-Back Enable (Valid range = 1 is enabled, 0 is disabled.) 0x000E = Ack-Back Retries (Valid Range = 0 - 255.) 0x000F = Ack-Back Timeout (Valid Range = 50 - 255.) 0x0010 = Communications Port (Valid range = 0 is SPI port, 1 is UART.) 0x0011 = Number of Repeaters in System (Valid range = 0 - 255.) DR915 Repeater Address Map:

0x0001 = Not used 0x0002 = Preamble Bytes (high byte) (Valid range = 266 - 1000. Default = 266. A value of less than 266 will cause improper operation.) 0x0003 = Preamble Bytes (low byte) 0x0004 = Group 1 (Valid range = 0 255.) 0x0005 = Group 2 (Valid range = 0 255.) 0x0006 = Baud Rate (*See below for proper settings.) 0x0007 = Debug Enable (Valid range = 1 is enabled, 0 is disabled.) Revision B INTEGRATORS GUIDE 27 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________

*Baud Rate settings for the DR915 and Repeater are as follows:

2400 baud = 215 4800 baud = 107 9600 baud = 53 (default) 14400 baud = 35 19200 baud = 26 28800 baud = 17 38400 baud = 12 (not recommended for use) 57600 baud = 8 Revision B INTEGRATORS GUIDE 28 CDR-9150 OEM DATA RADIO MODULE ___________________________________________________________________________________________ CDR-9150 DATA RADIO REGULATORY FCC Compliance Warning Changes or modifications to the CDR-9150 not expressly approved by Coyote DataCom, Inc. could void the users authority to operate this product. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates 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. Revision B INTEGRATORS GUIDE 29