ONE FOR THE RECEIVER AND ONE FOR THE TRANSMITTER
ADD A MOBILE DUPLEXER TUNED FOR THE 440 MHz UHF HAM BAND
THESE CAN BE FOUND ON EBAY OR THE HAM RADIO AD's IN
E-HAM ~ ARRL ~ 2nd HAND USED RADIO ELECTRONICS
NOTE: BEWARE OF THE CHEAP IMPORT MOBILE DUPLEXERS
THEY ARE KNOWN FOR POOR FREQUENCY STABILITY
MAKE SURE TO BUY A QUALITY NAME BRAND
OR WE CAN SELL YOU A NEW ONE FROM CELWAVE ($350)
ONLY 12 WIRES TO CONNECT TO THE RADIOS
READ BELOW FOR THE DETAILS
MIDIAN RM-1 INSTALLATION INSTRUCTIONS
Midian products utilize CMOS integrated circuits, which are susceptible to damage from high static charges. Be sure to follow standard antistatic procedures when handling, including using grounded workstations and soldering irons and wearing grounding bracelets. Please be careful when selecting wire colors. It is sometimes difficult to distinguish between the grey, black, and brown wire colors under fluorescent lighting. We suggest using Color-Bright/Color-Corrected or incandescent lighting. If in doubt, compare wire positions on board layout for correct color code.
Wire Function
Black Ground
Instructions: Connect to nearest ground point. Make sure common ground exists between both the receiving radio and transmitting radio.
Red 5 - 15 VDC
Connect to switched B+ in either the receive or transmit radio.
Brown Primary Receiver COR/COS Input
Connect to a point in the receiving unit’s Squelch circuit that changes logic level when carrier is received. Program desired COR/COS polarity in COR/COS Polarity in Channel Busy Control (Register 6). A radio whose squelch circuit provides a logic low or logic high can readily turn the COR/COS transistor, Q1, on and off. If the point that this lead is hooked to only makes a minute change in voltage, it will be necessary to adjust the values of R6, R7 and R8 to cause Q1 to change states. This wire is employed to hold off the Morse ID if the channel is busy and the unit is programmed for COR loss delay (Register 6A).
Green Tone/Voice Out to Modulator
Connect to a point in the transmitting unit’s modulator circuit. In Low-Z mic circuits, it may be necessary to short R23. Adjust R22 for 4.5 KHZ of deviation on peak voice from the receiver. If the orange RX wire is connected after the receiver’s volume control you may want to adjust the volume control in conjunction with R22. FCC rules part 90.425 state that the signal output of the ID sign al shall be 40%±10% of the maximum permissible modulation or deviation. Adjust R19 for 40% of system deviation after adjusting voice modulation.
Blue Alert speaker audio
This provides annunciated keyboard side tone for programming via the keypad. Connect to high side of speaker. (Speaker completes ground path for speaker emitter- follower transistor, Q3.) CAUTION: When attaching this le ad to a 4 or 8 Ohm speaker, add a 100 Ohm resistor in series with this blue lead to limit current. When using 20-40 Ohm speakers, the on board resistor i n series with Q3 should be sufficient.
Gray Primary Receiver CTCSS/DCS In (Optional COR)
This is the actual control input for the RM-1. It receives a logic level from the radio's CTCSS or DCS decoder. The RM-1 will only repeat when it sees the proper CTCSS decode logic level change. If the radio does not employ CTCSS o r DCS connect this to the receiving radio’s Carrier Detect and leave the COR/COS wire disconnected and program for a logic high on the COR polarity (Register 6). If the COR busy lead is not left disconnected the RM-1 will see a busy condition and will not repeat on straight carrier.
White PTT out
Connect to the transmitter PTT In. This keeps the radio keyed while sending Morse. The surface mount PTT transistor Q6 is rated at 100ma continuous. Therefore, use caution when connecting to old radios that employ relay coils with heavy coil currents. Also install a diode parallel to the relay coil to eliminate Counter EMF or serious damage may result to the microprocessor and void the warranty.
Orange/White Message Select/Program Input
If this input is not connected to ground, the first station ID will be sent, based upon the condition of the COR/CTCSS inputs. If this input is grounded, the second station ID or message will be sent. For programming with the KL-3, this input should be connected to the green lead of the KL-3.
Violet Optional Secondary Receiver Inhibit
A logic low on this input can be used fro m an auxiliary receiver COR or CTCSS output to inhibit an ID on a rep eater system with simplex users operating on the repeater’s transmit frequency.
Orange Receive Audio Input
Connect to discriminator, de-emphasize d audio, or low-pass audio point in receiver.
Gray/White PL Inhibit Line
This output will be taken to ground during Morse Code ID generation.
Green/White Program Enable
For programming with the KL-3, this lead should be grounded before power up to force the RM-1 into programming mode.
IF THESE 12 WIRES LOOK TO COMPLEX FOR YOU TO DO BY YOURSELF THEN YOU NEED TO ENLIST THE HELP OF AN "ELMER" IF YOU ARE A HAM.
IF YOU ARE A GMRS PERSON THEN YOU NEED TO FIND A GOOD RADIO TECH TO HELP YOU OUT.
OR BUY THE BRIDGECOM REPEATER WITH THE TWO YEAR WARRANTY GIVE US YOUR FREQUENCIES UP FRONT AND THE FACTORY WILL TUNE AND EVEN LOAD YOUR ID AND IT WILL BE READY TO "PLUG AND PLAY" UPON YOUR RECEIPT OF THE REPEATER.
USAMADE