Galaxy
2547 ALIGNMENT PROCEDURES
Peak-Tweak Layout at bottom of page.
This transceiver has been aligned at the factory and does not require any adjustments at installation. The required test equipment listed is used for the test setup or alignment shown in Figure 4-1 Transmitter Test Setup and Figure 4-2 Receiver Test Setup. This test setup is used in part or total during the following adjustments.
| PLL ALIGNMENT | |||
| ITEM | U.U.T. (UNIT UNDER TEST) SETTING | ADJUST POINT |
MEASUREMENT |
| Regulator Voltage |
Connect Voltmeter positive lead to
power switch. Connect Voltmeter negative lead to PCB ground. |
VR701 | 13.8 VDC |
| VCO | Disconnect 'short PCB' from TP7, TP8
and TP9. Set radio to CH 1 AM RX mode. Connect Voltmeter to TP2. |
L14 | 2.5 VDC t 0.1 |
| Set CLARIFIER Control to 12 o'clock. Connect Oscilloscope to TP3. |
L15 | Adjust for max. | |
| Connect Frequency Counter to IC3 Pin 8 | VC1 | 10.2400MHz t 20Hz | |
| AM Frequency | Set radio to CH 1 AM RX mode. Connect Frequency Counter to TP3. |
L20 | 16.2700MHz t 20Hz |
| USB Frequency | Set radio to CH 1 USB RX mode. Connect Frequency Counter to TP3. |
L21 | 16.2725MHz ± 20Hz |
| LSB Frequency | Set radio to CH 1 LSB RX mode. Connect Frequency Counter to TP3. |
L22 | 16.2675MHz ± 20Hz |
| TX Offset Frequency |
Set radio to CH 1 AM TX mode. Connect Frequency Counter to TP3. |
VR7 | 16.2675MHz t 20Hz |
| AM OSC | Set radio to CH 1 AM TX mode. Connect Frequency Counter to TP5. |
L23 | 10.695OMHz ± 10Hz |
| USB OSC | Set radio to CH 1 USB TX mode. Connect Frequency Counter to TP6. |
L24 | 10.6925MHz t 10Hz |
| LSB OSC | Set radio to CH 1 LSB TX mode. Connect Frequency Counter to TP6. |
L25 | 10.6975MHz:t 10Hz |
| TRANSMITTER ALIGNMENT | |||
| BIAS Current | Set radio to CH 19 USB TX mode. Modulation Off. Connect current meter to TP7(+) and TP9 Connect current meter to TP7 (+) and TP8 |
VR12 VR10 |
50 mA 100 mA |
| SSB APC | Set radio to CH 19 USB RX mode. Connect Multimeter to TP7. |
VRI7 | 12.5 VDC |
| SSB TX Power | Connect "short PCB" to TP7,
TP8 and Connect RF Power Meter to antenna jack. Set radio to CH 19 USB TX mode. AF signal 30mV, 1 KHz to microphone. Set RF PWR Fully Clockwise. Set MIC GAIN Fully Clockwise. |
L40,L42, L43,L44 |
MAX > 12W Spurious Emission Minimum. Balance Power Between CH1 and CH4O. |
| SSB ALC | Set radio to CH 19 USB TX mode. AF signal 3OmV, I KHz to microphone |
VRI3 | 11.5 W |
| SSB Carrier Balance |
Set radio to CH 19 USB TX mode. Set MIC GAIN Fully Counter Clockwise. Connect Oscilloscope to antenna connector. |
VR6 | Spurious Emission to Minimum. |
| AM TX High Power |
Set radio to CH 19 AM TX mode. Modulation Off. |
VR14 | 3.8 W |
| AM TX Low Power |
Set RF POWER fully counterclockwise. | VR18 | 0.5w |
| RF Power Meter |
Set radio to CH 19 AM TX mode. Set RF POWER fully Clockwise. Set SWR/MOD/PWR Switch to PWR position |
VR9 | For a needle reading of "4" on TX PWR scale. |
| AM Modulation Meter |
Set radio to CH 19 AM TX mode. AF signal 30mV, 1 KHz to microphone. Set MIC Gain fully Clockwise. Set SWR/MOD/PWR Switch to MOD position |
VR16 | For a needle reading of 95% on the Modulation scale. |
| Frequency Counter Adjust |
Set radio to CH 19 AM RX mode Set CLARIFIER Control to 12 o'clock. |
VC1 on frequency counter PCB. |
Display should be 27.1850 |
|
RECEIVER ALIGNMENT |
|||
| AM Sensitivity | Set radio to CH 19 AM RX mode. Set RF GAIN Fully Clockwise. Set SQ Fully Counter Clockwise. Set VOL Control at 2 o'clock. Set NB/ANL switch to OFF position. Set TONE Fully Clockwise. Set CLARIFIER Control to 12 o'clock. Connect RF SG to antenna jack Frequency 27.185 MHz, lmV. Mod 30%. |
L2,L3,L5,L6, L7,L8,L9,L10 |
Audio Output > 2V S/N > 10 dB. |
| Set radio to CH 40 AM RX mode. RF SG setting 27.405 MHz. Set radio to CH 1 AM RX mode. RF SG setting 26.965 MHz. |
L5,L6 | For Balance Between CH 1 and CH 40 |
|
| USB Sensitivity | Set radio to CH19 USB RX mode Set VOL Control Fully Clockwise. RF SG setting 27.186 MHz, 0.5uV. Mod off. |
L11,L12 | Audio Output > 2V S/N > lOdB |
| LSB Sensitivity | Set radio to CH19 LSB RX mode Set VOL Control Fully Clockwise. RF SG setting 27.184 MHz, 0.5uV. Mod off. |
L11,L12 | Audio Output > 2V S/N >lOdB. |
| NB Adjust | Set radio to CH 18 AM RX mode. RF SG setting 27.185 MHz, 1000mV Mod off. Set NB/OFF switch to ON position. Connect Multimeter to TP1 (D2 cathode). |
L1 | DC Voltage to max. (> 2.OV) |
| AM Squelch | Set radio to CH 19 AM RX mode. Set SQ Control Fully Clockwise. RF SG setting 27.185 MHz, 2OmV. Mod 30%. |
VR4 | Adjust very slowly until squelch just closes. |
| SSB Squelch | Set radio to CH 19 USB RX mode. Set SQ Control Fully Clockwise. RF SG setting 27.186 MHz, 20 mV. Mod off. |
VR3 | Adjust very slowly until squelch just closes. |
| AM S-Meter | Set radio to CH 19 AM RX mode. RF SG setting 27.185 MHz, 100mV. Mod 30%. |
VR1 | For a reading of "9" on the "S" scale. |
| SSB S-Meter | Set radio to CH 19 USB RX mode. RF SG setting 27.186 MHz, 100mV. Mod off. |
VR2 | For a reading of "9" on the "S" scale |