User’s Guide SD-225 Series 16 Channel UHF/VHF Data Radio www.midlandradio.
SD-225 User’s Guide FCC RF EXPOSURE COMPLIANCE REQUIREMENTS FOR OCCUPATIONAL USE ONLY The Federal Communications Commission (FCC), within its action in General Docket 93-62, November 7, 1997, has adopted a safety standard for human exposure to Radio Frequency (RF) electromagnetic energy emitted by FCC regulated equipment. Midland Radio Corporation subscribes to the same safety standard for the use of its products.
SD-225 User’s Guide Contents Conventions and Symbols in this Book ................................... 4 Disclaimer ................................................................................ 4 Safety ....................................................................................... 4 Introduction .............................................................................. 6 Radio Models ....................................................................... 6 Radio Features.....................
SD-225 User’s Guide Conventions and Symbols in this Book This symbol marks a “caution”. Cautions are special notices which you should read and follow carefully to avoid possible damage to your equipment and to avoid potential danger to yourself or other people. ! This symbol marks an “important point”. Important points are specific instructions which should be followed closely for proper operation. This symbol marks a “note”. Notes are hints or tips which offer additional information to help you.
SD-225 User’s Guide Do not operate the transmitter of any radio unless all RF connectors are secure. All equipment must be properly grounded for safe operation. Do not allow children to operate or play with or near the radio equipment. Never attempt to service the radio yourself. All equipment should be serviced by a qualified technician. Contact you local dealer or communications coordinator for assistance.
SD-225 User’s Guide Introduction Congratulations! By choosing the Midland SD-225 data radio, you have selected a flexible, easily configured communication device. Its rugged design will provide years of reliable service and exceptional performance. Radio Models The SD-225 data radio is available in three frequency ranges.
SD-225 User’s Guide 5 Transmit time-out timer may be programmed to limit continuous transmission time. 5 Transmit hang timer may be programmed to keep the transmitter active for a short time after the PTT signal is removed.. 5 Basic radio controls (transmit mode, receive mode, channel change, and modem test) are available via serial commands.
SD-225 User’s Guide Radio Connections Connection Overview The SD-225 features two standard interfaces. The data interface is used for connection to external modems and provides flat, unfiltered input and output. The audio interface is used for voice and some voiceband (300 – 3000 Hz) signaling applications. If the internal modem option is installed, the data interface may be configured for direct asynchronous RS232 data input and output. PTT and Busy may also be configured for RS232 levels.
SD-225 User’s Guide decoded, before pin 6 will switch low. With the internal modem option, the BUSY output may be changed to RS232 level. Modulation Input Connections The two choices for modulation are DATA_IN, DB9 pin 1 or MIC_IN, DB9 pin 7. When the SD-225 is used in low speed data applications (with an external modem), the modem data to be transmitted is usually connected to pin 1. The SD-225 connects the pin 1 input to the transmitter by default.
SD-225 User’s Guide 2.5 in External Interface 1.2 in 4.6 in 1. DB9 male: modulation input, demodulation output, control inputs and power supply. 2. BNC female: antenna connection.
SD-225 User’s Guide Pin No. Name/Function Description Signal Type DATA_IN Data modulation input LK409 in, LK412 out: A/C coupled signal to modulator through the data low pass filter, without preemphasis. Analog signal 100-120 mVrms of 1KHz audio for 60% deviation DATA_IN RS232 data input LK409 out, LK412 in: Asynchronous data input to Bell 202/V.23 modem option. See modem manual.
SD-225 User’s Guide Setup and Operation Mounting 2.01 in 1.93 in D=0.14 in 4.33 in The SD-225 data radio should be secured to the mounting surface or bracket using suitable screws through the four mounting flanges. The mounting hole center to center dimensions are shown above. The RF cabling should be routed separately from the control cabling to avoid interference.
SD-225 User’s Guide The normal operating channel should be selected using the internal DIP switch, SW401. The radio channel may also be selected by serial commands, but the radio will always power up on the channel selected by the DIP switch. 1. Remove the four screws securing the top cover and remove the top cover. 2. Set the DIP switch for binary channel selection according to the chart above, i.e. channel 1 is all switches off, channel 16 is all switches on. 3.
SD-225 User’s Guide Specifications General specifications VHF UHF Frequency range V2 – 146-174 MHz U1 – 400-440 MHz U2 – 440-480 MHz FCC ID numbers MMASD225V2 MMASD225U1 MMASD225U2 FCC type acceptance Part 90 Maximum number of channels 16 Channel spacing 12.5 / 15 / 25 / 30 KHz 12.5 / 25 KHz Channel stepping 2.5 / 5.0 / 6.25 KHz 5.0 / 6.25 KHz CTCSS/DCS 49 CTCSS / 104 DCS Input voltage 9-18 Vdc MIL spec Size (H x W x D) Weight 1.2 x 2.5 x 4.8 inches (30 x 63 x 122 mm) 0.5 lbs (0.
SD-225 User’s Guide Warranty Statement Midland Radio Corporation (herein, Midland) warrants each new radio product manufactured or supplied by it to be free from defects in material and workmanship under normal use and service for a period listed below, provided that the user has complied with the requirements stated herein. The Warranty period begins on the date of purchase from an Authorized Midland Sales and Service Outlet.
This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. This radio operates in FCC regulated frequency bands. All radios must be licensed by the FCC before use. Because this radio contains a transmitter, Federal law prohibits unauthorized use or adjustments of this radio. 5900 PARRETTA DRIVE, KANSAS CITY, MISSOURI, 64120 PHONE: (816) 241-8500, FAX: (816) 241-5713 www.midlandradio.
