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Ranger TR-296

CHASSIS EPT014811Z


WINScanner

WINScanner

Software for Ranger TR-296



Block Diagram

User manual


Adjustment



Test equipment required:
Power Supply: 13,8 VFrequency CounterDummy Load 50 ohmOscilloscope
DC AmperemeterRF SSGAF SSG

Preparation alignment:
ClarifierMid.
SQ GAINMax.
AF GAINMax.
RF GAINMax.
MIC GAINMax.
MOD, S/RFS/RF
NB/ANLOff
Channel19

ItemSettingAdjustMeasurement
PLL ALIGNMENT
VCO VoltageSet radio to CH 1, AM RX mode.
Clarify setting in 12 o’clock position.
Connect DC Voltmeter to TP9 (R207).
Connect Oscilloscope to TP10 (R101).
Connect Oscilloscope to TP1 (R106).
L19
L21
L20
2.5 VDC 0.1
CH 1 & CH 40 Max.
Output and Balance.
AM FrequencySet radio to CH 1, AM RX mode.
Connect frequency counter to TP1 (R106).
L2334.76500 MHz 20 Hz
LSB FrequencySet radio to CH 1, LSB RX mode.
Connect frequency counter to TP1 (R106).
L2234.76350 MHz 20 Hz
USB FrequencySet radio to CH 1, USB RX mode.
Connect frequency counter to TP1 (R106).
L5934.76650 MHz 20 Hz
TX FrequencySet radio to CH 1, AM TX mode.
Connect frequency counter to TP1 (R106).
VR534.76500 MHz 20 Hz
AM TX FrequencySet radio to CH 19, AM TX mode.
Set Mic Gain fully counter clockwise.
L3127.18500 MHz 20 Hz
LSB TX FrequencySet radio to CH19, LSB TX mode.
Set Mic Gain fully clockwise.
AF signal 25 mV, 1 KHz to microphone.
L3027.18400 MHz 20 Hz
USB TX FrequencySet radio to CH19, USB TX mode.
Set Mic Gain fully clockwise.
AF signal 25 mV, 1 KHz to microphone.
CT227.18600 MHz 20 Hz
TRANSMITTER ALIGNMENT
BIAS CurrentSet radio to CH 19, USB TX mode. MOD off.
Connect current meter to TP8 (+) and green lead wire (-).
Connect current meter to TP7 (+) and violet lead wire (-).

VR8

VR9

30mA

50mA
AM TX PowerSet radio to CH 19, AM TX mode.
Connect RF power meter to antenna jack.

L48, L47
L46, L45
L38, L36

L38

VR10
RF Power Output
MAX

Balance Power between CH 1 and CH 40.

4W.
SSB ALCSet radio to CH 19, USB TX mode.
Set Mic Gain fully clockwise.
AF signal 25 mV, 1 KHz to microphone.
VR1112W
SSB Carrier BalanceSet radio to CH 19, USB TX mode.
Connect Oscilloscope to L44 (TR39C).
Mic Gain off.
VR4Spurious Emission to minimum.
AM ModulationSet radio to CH 19, AM TX mode.
Set Mic Gain fully clockwise.
AF signal 30 mV, 1 KHz to microphone.
VR790%
RF Power MeterSet radio to CH 19, AM TX mode.
MOD off.
VR6Adjust RF Power meter needle until it is in-between the green and red bar on PWR scale.
RECEIVER ALIGNMENT
AM SensitivitySet radio to CH 20, AM RX MODE.
Clarify setting in 12 o’clock.
Set RF gain fully clockwise.
Set SQ fully counter clockwise.
Set VOL control to 2 o’clock.
Set NB/ANL to OFF position.
Connect RF SG to antenna jack.
Frequency 27.205 MHz, Level 1 uV.
MOD 30%, 1KHz.
Set radio to CH 40 AM mode.
RF SG setting 27.405 MHz.
Set radio to CH 1 AM mode.
RF SG setting 26.965 MHz.
L13, L15
L3, L4, L5
L6, L7, L8
L9, L10
Audio output > 2V
S/N > 10 dB
USB SensitivitySet radio to CH 20, USB RX mode.
MOD off.
Set VOL control fully clockwise.
RF SG setting 27.206 MHz, Level 1 uV.
L12, L14 Audio output > 4.5V
S/N > 20 dB
LSB SensitivitySet radio to CH 20, LSB RX mode.
MOD off.
VOL control fully clockwise.
RF SG setting 27.204 MHz, Level 1 uV.
L12, L14 Audio output > 4.5V
S/N > 20 dB
NB/ANL AdjustSet radio to CH 20, AM RX mode.
RF SG setting 27.205 MHz, Level 100 uV.
MOD 30%, 1KHz.
Set NB/ANL/OFF switch to NB/ANL.
Connect Voltmeter to D2 (Cathode).
L1, L2DC voltage to max.
( >1.5V )
AM SquelchSet radio to CH 20, AM RX mode.
Set SQ control at fully clockwise.
RF SG setting 27.205 MHz, Level 1 mV.
MOD 30%, 1KHz.
VR3
Slowly
Adjust very slowly until quelch just open
AM S/RF MeterSet radio to CH 20 AM RX mode.
MOD off.
Set S-RF/CAL/SWR switch to S/RF position.
RF SG setting 27.205 MHz, Level 100 uV.
VR1Meter needle to S9 on the S scale
SSB S/RF MeterSet radio to CH 20, USB RX mode.
MOD off.
Set S-RF/CAL/SWR switch to S/RF position.
RF SG setting 27.206 MHz, Level 100 uV
VR2Meter needle to S9 on the S scale

Microphone Connection

PinDescription
1Microphone Ground
2Microphone
3RX Key (Connect to Ground)
4Ground
5TX Key (Connect to Ground)

COMPONENTS

Cobra User Manual
Ranger User Manual
TR-296 Schematic Diagram
RCI-8719 PLL Frequency Synthesizer (Ranger)
MB-8719 PLL Frequency Synthesizer (Cobra and Uniden)
TDA6130 TX Mixer
AN612 Balanced SSB Modulator
TA7222AP Audio Power Amplifier
2SC1969 RF Finale Transistor

Improved receive gain

Quieting of AM reception and improving gain of incoming signals is a common request from radio operators. In the first stages of the HF input 2SC1674 transistor can be found. This transistor is responsible for the amplification of a small detected signals. A problems exist if the transistor itself is noisy as is such the case of the 2SC1674 when compared to other low noise packages. Along with the amplification of the incoming signals is transistor noise. Replacement of this transistor with a higher gain, lower noise transistor greatly improves the signal to noise ratio of your receiver.
We will use an 2SC2999 transistor that has higher gain lower noise characteristic. Replace the 2SC1674 (TR14) with an 2SC2999 (or similar low noise and high gain transistor) to achieve this improved signal to noise ratio.
Re-Adjust L4 and L5/L6
The gain will improved with more than 6dB with the same signal to noise ratio.