Ranger 2950dx Cd Tranciever Manual

							 
- 11 - RCI-2950 DX  
RCI-2970 DX  
 CHAPTER 4 PROGRAMMING     
4.0 INTRODUCTION 
This section explains the basic programming procedures for the RCI-2950 DX / RCI-2970 DX Amateur 
10 and 12 meter dual band mobile transceiver. 
 
4.1 FREQUENCY SELECTION 
Frequency selection in the RCI-2950 DX / RCI-2970 DX can be accomplished using anyone of the 
three following methods: 
 
(1) The first method of frequency selection is through the use of the SHF (Shift) key and the (s) Up 
and (t) Down arrows. To accomplish this, press the SHF button until the cursor arrow is positioned 
under the digit of the frequency that is to be changed, then use the (s) Up arrow to increase the 
number. If a decrease in frequency is desired, press the (t) Down arrow. Perform the steps described 
above for each digit of the frequency until the desired frequency is displayed in the LCD display 
window. 
 
(2) The second method of frequency selection is accomplished using the SHF button and the frequency 
select knob located above the microphone jack. Use the SHF button in the manner described above 
to select the digit to be changed. Proceed to rotate the frequency select knob clockwise to increase 
the frequency. Rotate the frequency select knob counterclockwise to decrease the frequency. 
 
(3) The third method of selecting the operating frequency of the radio is through the use of the SHF 
button and the Channel (s) Up and (t) Down buttons located on the microphone. Frequency 
selection by this method is accomplished in the same manner as with the (s) Up and (t) Down 
arrows on the keypad. The only difference is that the Channel Up and Down buttons on the 
microphone are used. 
 
4.2 FREQUENCY SCANNING 
Frequency scanning can be achieved using one of two methods: the first method involves the scanning 
of pre-programmed memory channels. The second method permits the user to scan all frequencies 
between a pre-set upper and lower scan limit.  
 
4.2.1 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 steps: 
 
(1) Press the PRG (Program) key. 
 
(2) Press the SCAN key (“PRG SCAN+” should appear in the lower right corner of the display 
window). 
  
(3) Using the SHF key and the (s) Up and (t) Down arrows, select the upper scan limit, then press 
ENT. 
  
						

							 
- 12 - (4) Press the SCAN key again (“SCAN-” should appear in the display window). 
 
(5) Using the SHF key and (s) Up and (t) Down arrows, select the lower scan limit, then press ENT. 
  
The upper and lower scan limits have now been programmed. To activate the scan feature, return the 
radio to manual operation and press the SCAN button. If the display shows “SCAN+”, the radio will 
scan from the lower limit to the upper limit. If “SCAN-” is displayed, the unit will scan from the upper 
limit to the lower limit. To change from SCAN+ to SCAN- or vice versa, press SCAN. 
 
NOTE 
When programmed, the upper and lower scan limits will 
also act as the upper and lower operating limits of the 
radio. The radio now cannot be programmed to operate 
above or below the scan limits.  
4.2.2 MEMORY SCANNING 
The RCI-2950 DX / RCI-2970 DX 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. The 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, press the PRG (Program) key. 
 
(2) Press the MEM (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 
the memory location currently being displayed. Pressing the MEM key will increase the memory 
counter to the next memory location and the contents of that memory location will be displayed. 
 
(3) Using the SHF key and the (s) Up and (t) Down arrows, enter the frequency to be stored in the 
memory location displayed. After the desired frequency has been entered, press ENT. 
 
(4) Repeat steps (2) and (3) for all 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 MAN key. 
 
(6) To initiate memory scanning, press MEM and then press SCAN. As previously discussed, the 
display will show “SCAN+” or “SCAN-” to indicate whether the radio is scanning from the lowest 
or the highest memory location or vice versa. 
 
(7) To return the radio to normal (non-scanning) operation, press the MAN key. 
 
 
 
 
 
4.3 OFFSET FREQUENCY OPERATION  
						

							 
- 13 - The RCI-2950 DX / RCI-2970 DX 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 
and 12 Meter bands. 
 
NOTE 
The FM repeaters may require a subaudible (CTCSS) tone 
be transmitted to gain access to the repeater. The RCI-
2950/2970 DX 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 100 KHz offset 
will be described. Before attempting to program the offset frequency, ensure that the radio is operating in 
the manual mode by pressing the MAN key. 
 
(1) Press the PRG (Program) key. 
 
(2) Press the SPLIT key. The LCD display window will display “00000” with “PRG” and “SPLIT” 
being displayed in the lower left-hand corner. 
 
(3) Using the SHF key and the (s) Up and (t) Down arrows as described earlier, program the display to 
read “010000”. 
 
(4) Press ENT. A 100 KHz offset has now been programmed into the radio. 
 
(5) Return the radio to manual operation by pressing the MAN key. 
 
(6) Using the SHF key and the (s) Up and (t) Down arrows as described previously, set the radio for 
the desired receive frequency. 
 
(7) Press SPLIT. In the lower right corner of the display, either “SPLIT+” or “SPLIT-” will be 
displayed. If SPLIT+ is displayed, the transmitter will be offset 100 KHz above the receive 
frequency when keyed. If SPLIT- is displayed, the transmitter will be offset 100 KHz below the 
receive frequency. 
 
  
NOTE 
When 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 MAN 
key. 
 
 
 
 
  
						

							 
- 14 -  
RCI-2950 DX  
RCI-2970 DX  
 CHAPTER 5 CIRCUIT DESCRIPTION     
5.0 INTRODUCTION 
This section explains the technical theory of operation for the RCI-2950 DX / RCI-2970 DX mobile 
transceiver. 
 
5.1 PLL CIRCUIT 
The Phase Lock Loop (PLL) circuit is responsible for developing the receiver’s first local oscillator 
signal and the transmitter’s exciter signal. The PLL circuit consists primarily of IC2, IC3, Q29, Q32, 
Q33, Q34, Q36, Q37, Q38 and L16. The PLL circuit is programmed by the rotary channel switch GPS-
0688. The switch allows IC (U601) on CPU P.C.B to communicate the correct binary data information 
to the programmable divider inside of IC2. IC2 then controls the VCO (Voltage Controlled Oscillator) to 
oscillate on the correct frequency. This signal is fed either into the receiver’s first mixer (for receive 
operation) or the transmitter’s mixer (for transmit operation). 
 
5.2 RECEIVER CIRCUIT  
The incoming receives signal come into the radio via the antenna and into the front-end pre-amp 
consisting of Q19. The RF signal is fed into the mixer circuit of the Q20 and Q21. The signal is then 
filtered by L8, L9 and L10 then into the AM/FM IF section of the receiver (depending on the mode of 
operation). The signal is then detected by either the AM detector FM detector and then fed to the audio 
amplifier section of the receiver and finally out to the speaker. 
 
5.3 TRANSMITTER MODULATION CIRCUIT 
(1) The transmitter modulation circuit modulates the low-level RF signal from the PLL exciter circuit 
with the user’s audio voice signal from the microphone. The audio from the microphone is then 
amplified and fed into the balanced modulator circuit. 
 
(2) If the transceiver is in the AM mode, the AF power amplifier modulates the last RF amplifier which 
produces a true amplitude modulated RF signal. 
 
(3) If the transceiver is in the FM mode, the audio signal is not mixed with 10.6975MHz oscillator but 
instead phase modulates the basic exciter signal from the PLL circuit in the TX mixer.  
 
(4) If the transceiver is in the SSB mode, the audio signal is mixed with 10.6975MHz oscillator in IC5. 
 
5.4 TRANSMITTER AMPLIFIER CIRCUIT 
The transmitter takes the basic exciter signal from the TX mixer and amplifies it through a series of 
amplifiers consisting of Q64, Q63, Q62, Q61, Q60 and the EPA010010A amplifier (only for RCI-2970 
DX) where it is sent out to the antenna connector. 
 
 
 
 
  
						

							 
- 15 -   
						

							 
- 16 -  
						

							 
- 17 - RCI-2950 DX / RCI-2970 DX CPU CIRCUIT DIAGRAM   
						

							 
- 18 - RCI-2950 DX  
RCI-2970 DX  
 CHAPTER 6 ALIGNMENT    
6.0 REQUIRED TEST EQUIPMENT 
 
 DC Power Supply (13.8VDC, 20A) 
‚ RF Wattmeter (100W)  
ƒ Multimeter 
„ Automatic Modulation Meter 
… Audio Signal Generator † Frequency Counter (100 MHz) 
‡ RF Signal Generator (100 MHz)   
ˆ Automatic Distortion Meter 
‰ Oscilloscope (50 MHz) 
Š Sinad Meter 
 
6.1 ALIGNMENT PROCEDURES 
This transceiver has been aligned at the factory and does not require any adjustments at installation. The 
required test equipment listed are used for the test setup or alignment shown in Figure 6-1 Transmitter 
Test Setup and Figure 6-2 Receiver Test Setup. These test setups are used in part or total during the 
following adjustments and refer to Page 44 for adjustment location. 
 
6.1.1 PLL ALIGNMENT 
 
ITEM U.U.T. SETTING ADJUST 
POINT MEASUREMENT PLL 2  
VCO Voltage Set radio to 24.890 MHz, AM RX mode. 
Frequency setting at 29.699 MHz. 
Connect Multimeter to TP10. L14 
1.0 VDC ± 0.1 
£ 4.5 VDC     PLL 1 
VCO Voltage Set radio to 24.890 MHz, AM RX mode. 
Frequency setting at 32.000 MHz. 
Connect Multimeter to TP11. L13 
1.0 VDC ± 0.1 
£ 6.5 VDC     AM Frequency Set radio to AM RX mode. 
Set Clarifier Control to 12 o’clock.  
Connect Frequency Counter to TP16. VC2 
 10.1000 MHz ± 10 
Hz 
     TX Frequency Set radio to AM TX mode. 
Connect Frequency Counter to TP16. VR8 
10.1000 MHz ± 10 
Hz     VCO Output Set radio to 28.000 MHz, AM RX mode. 
Connect Oscilloscope to TP3. L17 Maximum  Output   
 38.6950 MHz @ TP3     AM OSC Set radio to AM TX mode. Mod off. 
Connect Frequency Counter to TP5. L18 
10.6950 MHz ± 10 
Hz     USB OSC Set radio to USB TX mode. Mod off. 
Short TP6 to ground. 
Connect Frequency Counter to TP5. L20 
 10.6975 MHz ± 10 
Hz 
     LSB OSC Set radio to LSB TX mode. Mod off. 
Connect Frequency Counter to TP5. L19 
10.6925 MHz ± 10 
Hz      
6.1.2 TRANSMITTER ALIGNMENT  
						

							 
- 19 -  
RCI-2970DX LEVELS ARE SHOWN IN []. 
 
ITEM U.U.T. SETTING ADJUST 
POINT MEASUREMENT TX Power Set radio to 28.000 MHz, AM TX mode. 
Modulation off. 
Set radio to 28.000 MHz, USB TX mode. 
AF signal 30mV, 1 KHz to microphone. 
Connect Oscilloscope to TP17. 
Set RF PWR Fully Clockwise. 
Set Clarifier Control to 12 o’clock. 
Set radio to 24.890 MHz & 29.699 MHz. L18,L37,L35, L34 
 
 
 
 
 
L35,L34 Maximum Output. 
 
 
 
 
 
 
Maximum Output and 
Balance.     AM APC Set radio to AM TX mode. 
Connect Multimeter to TP8 VR15 
 6 VDC 
     SSB APC Set radio to USB TX mode. 
Connect Multimeter to TP8 VR18 12.5 VDC     BIAS Current Set radio to USB TX mode. 
Modulation off. 
Connect current meter to TP7(+) and TP9(-) 
Connect current meter to TP7(+) and TP8(-) 
  
 
VR13 
VR12 + VR11 
 
10 mA 
(50 mA + 50 mA) = 
100 mA     AM TX Power Set radio to 28.000 MHz, AM TX mode. 
Modulation off. 
Connect “short PCB” to TP7 and TP9. 
Set RF PWR Fully Counter Clockwise. 
Connect RF Power Meter to antenna jack. VR15 
 
 
VR19 10W [50W] 
 
 
1W [8W]     RF Power Meter Set radio to 28.000 MHz, AM TX mode. 
Set RF Power Fully Clockwise. VR10 Level Meter Indicator     SSB ALC Set radio to USB TX mode. 
AF signal 30 mV, 1 KHz to microphone. VR14 
 25W [150W, PEP] 
     SSB Carrier 
Balance Set radio to USB TX mode. 
AF signal 30 mV, 1 KHz to microphone. 
Connect Oscilloscope to antenna jack. VR7 Spurious Emission to 
minimum.     CW TX Set radio to 28.000 MHz, CW TX mode. 
Plug in CW Key. 
Disconnect the Mic Jack. 
Connect AC Voltmeter to EXT SP. VR9 200mV (Sine Wave)     AM Modulation FM Modulation Set radio to 28.000 MHz, AM TX mode. 
Set radio to 28.000 MHz, FM TX mode. 
AF signal 30 mV, 1 KHz to microphone.  
Set Mic Gain Fully Clockwise. VR17 90%  
4 KHz      
 
 
6.1.3 RECEIVER ALIGNMENT  
						

							 
- 20 -  
ITEM SETTINGS ADJUST 
POINT MEASUREMENT AM Sensitivity Set radio to 28.000 MHz, AM RX mode. 
Set Clarifier Control to 12 o’clock.  
Set RF Gain Fully Clockwise. 
Set SQ Fully Counter Clockwise. 
Set NB/ANL/OFF switch to OFF position.  
Set VOL Control at 2 o’clock.  
Connect RF SG to antenna jack  
Frequency 28.000 MHz, 1uV. Mod 30%. 
Set radio to 24.890 MHz, AM RX mode. 
RF SG setting 24.890 MHz. 
Set radio to 29.699 MHz, AM RX mode. 
RF SG setting 29.699 MHz. L5,6,7,8,9,10
,2,3 
 
 
 
 
 
 
L5,L6, L7 Audio Output > 2V 
S/N > 10 dB 
 
 
 
 
 
 
Balance between  
24.890 and 29.699 
MHz     USB Sensitivity  Set radio to USB RX mode. 
Set VOL Control Fully Clockwise.  
RF SG setting 28.001 MHz, 0.5uV. Mod off. L11, L12 Audio Output > 2V 
S/N > 10 dB 
     LSB Sensitivity 
 Set radio to LSB RX mode. 
Set VOL Control Fully Clockwise.  
RF SG setting 27.999 MHz, 0.5uV. Mod off. L11, L12 Audio Output > 2V 
S/N > 10 dB 
     FM Distortion Set radio to 28.000 MHz, FM RX mode. 
Set MODE switch to FM mode. 
RF SG setting 28.000 MHz, 1mV. Mod 3KHz. L4 Audio Output > 3V 
Distortion < 10% 
     NB Adjust Set radio to 28.000 MHz, AM RX mode. 
RF SG setting 28.000 MHz, 100uV. Mod off. 
Set NB/ANL/OFF switch to NB/ANL position. Connect Voltmeter to TP1. L1 DC Voltage to max. 
> 2V     AM Squelch Set radio to 28.000 MHz, AM RX mode. 
Set SQ Control Fully Clockwise. 
RF SG setting 28.000 MHz, 1mV. Mod 30%. VR4 Slowly Adjust very slowly until squelch just open.     SSB Squelch 
 Set radio to USB RX mode. 
Set SQ Control Fully Clockwise. 
RF SG setting 28.001 MHz, 1mV. Mod off. VR3 Slowly Adjust very slowly until squelch just open.     AM S/RF Meter AM S-Meter Set radio to 28.000 MHz, AM RX mode.  
RF SG setting 28.000 MHz, 100uV. Mod 30%. VR1 “6 bar” on the Level 
Meter Indicator.     SSB S-Meter 
 Set radio to USB RX mode.  
RF SG setting 28.001 MHz, 100uV. Mod off. VR2 “6 bar” on the Level 
Meter Indicator.      
 
 
 
 
 
 
 
Figure 6-1 Transmitter test setup