Ranger_RCI-2950_Secret_book.pdf

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1、RCI 2950 Service Manual Table of Contents G Specifications G Controls and Connections G Basic Programming Procedures G Technical Analysis of the circuits G Transistors Voltage Chart G RCI SECRETS G REPAIR TRICKS DIAGRAMS G Main PCB Schematic Diagram G CPU PCB Schematic Diagram G Chassis Exploded Vie

2、w Drawing G Inter-connection Diagram PCB Layouts and Parts G (EPT295013Z) G Main PCB Parts Layout Top View G Main PCB Copper Side View G LCD PCB (EPT295021Z) G CPU PCB (EPT295043Z) G MIC UP/DW (EPT295080Z) G MIC Jack PCB (EPT295070Z) G SWR PCB (EPT360040Z) G VR (A) PCB RF/MIC VOL/SQ (EPT295050Z) G V

3、R (B) PCB RF/CAL (EPT295060Z) G CH / Switch PCB (EPT295090A) G MODE PCB (EPT295090Z) G Push Button Switch PCB (EPT295031Z) PARTS LISTS G Capacitors G Coils, Transformers, Crystals, Filters G Resistors G ICs, Transistors G Diodes G Wire, Jumpers, Connectors G Chassis, Miscellaneous CW (8W); AM/FM (8W

4、) Spurious Emissions: -50dB Carrier Suppression (SSB Modes): -50 dB Receiver Sensitivity for 10dB SINAD: AM 0.5uV Sensitivity for 10dB SINAD: USB/LSB/CW 0.15uV Sensitivity for 12dB SINAD: FM 0.25uV Image Rejection Ratio: 65dB AGC Figure of Merit: SSB/CW/AM 80dB for 50mV for 10dB Change in Audio Outp

5、ut Audio Output Power: 2.5 Watts RCI-2950 Controls and Connections INTRODUCTION This section explains the basic operating procedures for the RCI-2950/2970 amateur 10 meter mobile transceiver. CONTROL the second method will permit the user to scan all frequencies between a preset upper and lower scan

6、 limit. Both methods of frequency scanning follow. All Frequency Scanning To allow All Frequency Scanning, one must first program the upper and lower scanning limits. The scan limits are simply the highest and lowest frequencies that will be scanned. To program these limits, perform the following st

7、eps: 1. Press the (Program) key. 2. Press the key. (“PRG SCAN+” should appear in the lower right corner of the display window. 3. Using the key and the and arrows, select the upper scan limit, then press . 4. Press the key again. (“SCAN -“ should appear in the display window.) 5. Using the key and t

8、he and arrows, select the lower scan limit, then press . The upper and lower scan limits have now been programmed. To activate the scan feature, return the radio to manual operation and press the button. If the display shows SCAN the radio will scan from the lower limit to the upper limit. If “SCAN

9、- is displayed, the unit will scan from the upper limit to the lower limit. To change from SCAN + to SCAN - or vice versa, press . NOTE: When programmed, the upper and lower scan limits will also act as the upper and lower operating limits of the radio. The radio cannot now be programmed to operate

10、above or below the scan limits. Memory Scanning The RCI-295012970 has 10 non-volatile (i.e* memory resident) memory locations which can be programmed with any available frequency within the operating band of the radio. The scan function of the unit can be programmed to scan these memory channels. Th

11、e radio will then scan only those memory channels which have been programmed. The first step in utilizing the memory scan function is to program the desired frequencies into the radio memory. This can be accomplished by performing the following steps: 1. With the radio operating in the manual mode,

12、press the (Program) key. 2. Press the (Memory) key. “PRG” should be displayed in the lower right-hand corner of the LCD display window. In the upper left portion of the display, “MEMORY” should be displayed. Directly below MEMORY, a number between 0 and 9 will be displayed. This number represents th

13、e memory location currently being displayed. Pressing the key will increase the memory counter to the next memory location and the contents of that memory location will be displayed. 3. Using the key and the and arrows, enter the frequency to be stored in the memory location displayed. After the des

14、ired frequency has been entered, press . 4. Repeat steps 2 and 3 for all of the memory locations to be programmed. 5. After all desired memory locations have been programmed with frequencies, return the unit to the manual mode of operation by pressing the key. 6. To initiate memory scanning, press a

15、nd then press . As previously discussed, the display will show “SCAN + “ or “SCAN -“ to indicate whether the radi0 is scanning from the lowest or the highest merory location or vice versa. 7. To return the radio to normal (non-scanning) operation, press the key. OFFSET FREQ. OPERATION The RCI-2950/2

16、970 has an offset or split frequency feature that will permit the radio to be operated in a half-duplex mode This will allow the user to talk on FM repeaters operating in the 10 Meter band. (NOTE The FM repeaters may require a sub-audible (CTCSS) tone be transmitted to gain access to the repeater. T

17、he RCI-2950 is not factory-equipped with a CTCSS encoder/ decoder.) The split frequency function offsets the transmitter frequency either above or below the receive frequency by a user programmable amount. In the following example, programming of a 100kHz offset will be described. Before attempting

18、to program the offset frequency, ensure that the radio is operating in the manual mode by pressing the key. 1. Press the key. 2. Press the key. The LCD display window will display “00000” with “PRG” and “SPLIT” being displayed in the lower left-hand corner. 3. Using the key and the and arrows as des

19、cribed earlier, program the display to read “010000.” 4. Press . A 100kHz offset has now been programmed into the radio. 5. Return the radio to manual operation by pressing the key. 6. Using the key and the and arrows as described previously, set the radio for the desired receive frequency. 7. Press

20、 . In the lower right corner of the display, either “SPLIT + “or “SPLIT -“ will be displayed. If SPLIT + is displayed, the transmitter will be offset 100kHz above the receive frequency when keyed. If SPLIT - is displayed, the transmitter will be offset 100kHz below the receive frequency. 9. NOTE: Wh

21、en the transmitter Is keyed, the frequency display will change to show the frequency being transmitted. 8. To return the radio to simplex operation (i.e, same transmit and receive frequency), press the key. Technical Analysis of the RCI 2950, RCI 2970, RCI 2990, Saturn Turbo circuitry The first stri

22、king element of the RCI is the complex frequency synthesizer. As most of the CB rigs use a + 10 Khz step , the RCI uses a 100 times thinner 100 Hz step. The brain of the RCI is the Microprocessor. The microprocessor is hold by the small board located behind the LCD display. This board rules the rig.

23、 It is a double sided board which holds a battery, an alignment of 2.54mm connectors, a voltage regulator (5V - MC7805) on its back. The regulator feeds all the digital components, a network of internal resistors. On the same side of the board, you can find a buzzer and a lithium battery which is he

24、re to keep the memories when the rig is switched off. Note that, in the latest versions of RCI rigs, the lithium battery has been replaced by a capacitor. The other side of the board holds 3 CMS chips, a double Op-Amp (5223), a box containing 6 inversors gates (buffers) CD4069. This last one is cont

25、rolling the 6 digits of the display. This side of the board also holds a 64 pins CMS chip, driven at 4 Mhz by a crystal, which is a CMOS circuit. It owns a ROM of 2 K, Four 4 bits registers, a 8 bit timer, a serial 8 bits communication interface, 24 Input/Output. Everything is controlled by 10 micro

26、seconds cycles. A controller-Driver of Liquid Display Boards is supervising all the needed display cycles on the 24 lines of the LCD segments to display the 6 numbers (7 segments by number) on the orange screen. The microprocessor is having very low consumption characteristics: less than 900 A. The

27、programming of the microprocessor is done at factory. All the functions and the frequencies range are stored into the ROM. A jumper allows us to change the frequency range. All the main informations are send to the frequency synthesizer by a limited amount of links: clock signals (CLK), transfers (L

28、AT), serial data (DATA). All these informations are not given by the schematic diagram but were useful to know. Lets pay a visit to the main board. The Frequency Synthesizer is complex because of the 100 Hz resolution. It owns a dozen of integrated circuits: a programmable divider (IC17:7925 Sony) a

29、ddressed in serial mode by the microprocessor, a first VCO (IC8: TA7310 Toshiba), two phase comparers (IC5-IC7 TC5081 Toshiba), three mixers (IC9-IC10-IC14: TA7310), an oscillator-divider driven by a 10.250 Mhz crystal. This part of the rig generates 2 different frequencies: in RC mode to get an inf

30、radyne pulse of the first conversion (RX QRG - Interm.QRG of 10.695 Mhz) and in TX, the necessary to produce a supradyne ( Interm.QRG of 10.695Mhz + FVCO). Depending of the TX mode, in AM/FM, the Q44 oscillator is controlled by X3 (10.695 Mhz). In SSB and CW, there is a 1500 Hz jump (+ 1500 Hz in US

31、B and CW and -1500 Hz in LSB). The transmit circuits follow the frequency synthesizer. It has a HF mixer (IC20 : SO42P Siemens). It is adapted in large band conditions by a set of varicaps D93-D94-D95. The result of the mixing is then applied to a band filter (L43-L46), amplifier in voltage by a tra

32、nsistor Q50: 2SC1730L. The output level of this TR is enough to control the pre-driver (Q49: 2SC1973). The pre-driver, via L41, excites two finals in parallel (Q46-Q47: 2SC2312). They are followed by a low-pass filter in PI (L32-L31) and associated capacitors C243-247-251). And then a hi-pass filter

33、 follows (L33/C248-VC3). A line of measurement of the SWR is present in the form of a vertical mini circuitry board, plugged between the TX output and the antenna plug. All the 3 power transistors are biased VR11. In AM and FM, the mixer IC20 adds the VCO QRG to 10.695 (Q44). In SSB and CW, it is th

34、e output of the crystal filter that is added. The receiver is classical: superheterodyne with 2 IF conversions. It is very similar to the one of most cb rigs. There are output stages: HF Amp (Q18: 2SC1674), transfo L8, first mixer Q19: 310), L9-L11 filter, the IF output by L12,L13,L14. What strikes

35、is the presence of varicaps D19,D23,D24 which works to produce a perfect tune in this large band rig. The band filtering is also perfect. It is done by two combined transfos linking the HF amp to the mixer. The ceramic IF filter FL2: 10.995 Mhz is attacked by L14. The a second stage of IF Q8 is feed

36、ing the second IF filter FL3 455 Khz. The first following TR loads Q5. Then Q10 use it to short the two left-hand pins for coverage from 29.7000 to 32.0000 MHz. If for some reason either or both ranges do not come up, press the white reset button next to the right-hand plug. For some odd reason, lat

37、er models were distributed with both plugs missing- possibly to keep some folks from monitoring above 29.7000 MHz- so the radios came ready to operate from 26.0000 to 29.6999 MHz ! For replacement shorting plugs/ obtain Radio Shack #276-1512 (10 count for S1.39, or equivalents from your local electr

38、onic store. Next, notice the two black shorting plugs on the FAR right-hand and left-hand sides of the same PC board; first, the left plug. Youll notice the plug shorting pins 1 and 2; use the plug to short pins 2 and 3. Press LOCK, which will result in a 40 channel eleven meter readout. Press LOCK

39、again and the frequency of the channel is displayed. Press MAN to revert back to normal VFO. NOTE: frequency LOCK function is lost and SHF (shift) wont work after this change is made; see switch mod following. Over to the right plug: again, this plug will be shorting pins 1 and 2; use it to short pi

40、ns 2 and 3. Press R.BEEP to get instant Channel 9. Press R.BEEP again and the frequency of channel 9 will be displayed 27.0650) Press MAN to revert back to VFO status. NOTE the roger beep function is lost after this change; see switch mod following. The above frequency modifications SHOULD NOT BE US

41、ED WITHIN THE U.S. except in dire emergencies or for MARS/CAP functions with proper license/permits, although radio hobbyists can MONITOR activities outside the Amateur band such as the range above 29.700 Mhz * Frequency Modification * Remove the bottom cover to gain access to the small PC board imm

42、ediately behind the front panel. There will be a set of jumpers marked J1 and J2. Move the jumper from the top two pins to the bottom two pins. Frequency coverage will now be expanded to 26mhz-29.7mhz. Press the MAN button to switch between CB operation and normal operation. Press the SHF button whi

43、le in CB mode to switch between CB channel readout and frequency readout. Press the ENT button while in CB mode for instand channel 9. *NOTE: The battery and the CPU reset have been eliminated in the newer versions, the new system uses memory capacitors for memory backup EXPAND YOUR RCI TO 25 MHZ AN

44、D 33 MHZ There is a trick to expand your RCI over the factory programmed limits. Yes, I agree that its not a very clean mod but it works great. So what _ This trick is to change the X2 crystal ( Quartz ) that is a 10,240 Mhz value one. You can experiment quartz from 9 Mhz to 12 Mhz ( Itll depend on

45、what you have ). This modification will increase the coverage of your RCI from 25 Mhz to 33 Mhz if you make all the quartz switches. Be carefull, the frequency that will be indicated by the LCD screen wont be true of course. You will need a separate frequency counter. May I suggest unsoldering the o

46、riginal crystal and replace with a mounting slot. Itll then be easier to exchange crystals quickly when needed. DO NOT TOUCH TO THE OTHER crystals. It would cause problems. HAM TO CB MODE MODIFICATION Very often, the RCI is sold as a HAM rig. But it was designed and developped on CB principals. All

47、the experts will tell you that the RCI contains the same components as all major CB TXs. So what ? Is it a CB or a HAM tranceiver ? The short reply is : BOTH. The RCI developing team thought it ham AND CB. The microcontroler board has the capabilities of indicating channels or frequencies. The chann

48、el mode has just been inactivated by a jumper. Lets get a rid of this limitation. The jumper is located on the LCD board. On the left side of this board, around the components R626 and RA610, you cannot miss the jumper. Take it off and place it in the other position. You have just activated the chan

49、nel mode. The Lock key will control whether you are in channel mode or in frequency mode. A CHANNEL 9 EMERGENCY KEY ? Yes, you have one in you RCI. In the same way you modified the previous jumper, you will find a second jumper on the RIGHT side of the LDC board . Take it off and place it in the other position. You have just enabled a channel 9 emergency key. This key is now the old R-Beep . Yeah. _ Who said that the RCI was not a CB rig ? POWER MODS INCREASE YOUR POWER ! ! ! ! ! You can boo