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President Harrison Alignment | Radioaficion Ham Radio

President Harrison Alignment

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CB Radio President Harrison Alignment and activate extra channels

TX Alignment:

Step Setting Connection Adjust Adjust for
1 RF Driver stage
Mode: Transmit
Volume: Optional
Squelch: Optional
Channel: 19
Connect Oscilloscope to base of Q602 T601
T602
Adjust for maximum wave-form on the oscilloscope
2 RF Power stage
Mode: Transmit
Volume: Optional
Squelsch: Optional
Channel: 19
Connect dummy-load and RF Power-meter to external ANT-jack T604 Adjust for maximum indication on the RF Power-meter
3 Second harmonic check
Volume: Optional
Squelch: Optional
Channel: 19
Connect RF Power-meter with dummy-load to spectrum analyzer At no modulation compare the level of fundamental freq-spectrum to the level of harmonic freq-spectrum.
Supression of the 2nd harmonic freq. level must be lower than -54dBm.
4 Frequency check
Mode: Transmit
Volume: Optional
Squelch: Optional
Channel: 19
Connect dummy-load and Frequency-counter to ANT-jack. CT901 Make sure that the indication of the transmit frequency is 27.185 MHz +/- 300 Hz.
5 Max. modulation check
Mode: Transmit AM
Volume: Optional
Squelch: Optional
Channel: 19
Connect dummy-load and Modulation-meter to ANT-jack. VR401 Adjust so that the indication of the Modulation-analyzer is 90% with +/- 5% tolerance at high power mode.
6 Max. deviation check
Mode: Transmit FM
Volume: Optional
Squelch: Optional
Channel: 19
Connect dummy-load and Modulation-meter to ANT-jack. VR401 Adjust so that the indication of the Deviation-analyzer is 2 kHz with +/- 0,2 kHz tolerance at high power mode.

President Harrison
RX Alignment:

Step Setting Connection Adjust Adjust for
1 RX Sensitivity
Mode: Receive
Volume: Fully clockwise
Squelch: Turn to clockwise
Channel: 19
SSG: 27.185 MHz, 1 uV(-107 dBm), AM 30% modulation
Connect RF Signal Generator to external ANT-jack. Connect SSVM Sinad Meter and Distortion Meter across External speaker out jack with 8 ohm dummy load. T501
T502
T504
T503
Adjust the parts of tuning circuit with observing AMD (AutomaticDisMeter) indicates 20 dB SINAD in AM-mode, and adjust output level of RF-SSG until speacker output level reaches about 500 mWatt (2.0 Volt)
2 RX Sensitivity
Mode: Receive
Volume: Fully clockwise
Squelch: Turn to clockwise
Channel: 19
SSG: 27.185 MHz, 1 uV(-107 dBm), AM 30% modulation
Connect RF Signal Generator to external ANT-jack. Connect SSVM Sinad Meter and Distortion Meter across External speaker out jack with 8 ohm dummy load. T001 Adjust for maximum indication on SSVM.
3 Squelch adjustment
Mode: Receive
Squelch: Tight
Channel: 19
SSG: 27.185 MHz
1 kHz mod., 2,815uV (-47dBm), 30% mod.
Connect RRF SSG to ANT-jack. Connect AF Power Meter and Distortion Meter across ext-speaker with 8 ohm dummy-load VR501 At each mode, Adjust the point until the audio appeared on oscilloscope
4 Signal meter adjustment
Mode: Receive
Volume: 500 mWatt
Squelch: Counterwise
Channel: 19
SSG: 27.185 MHz, 100 uV (-67 dBm), No mod.
Connect RF signalgenerator to external ANT-jack. Connect AF Power meter and Distortion Meter across external speaker jack with 8 ohm dummy load.

CB Radio President Harrison Alignment and activate extra channels

CEPT is 40 Channel FM
To activate extra channels:
Press and hold M4
Turn on the set by pushing PWR.

CB Radio President Harrison Alignment and activate extra channels

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