President HR2600 CB-Radio

ALIGNMENT PROCEDURE

TRANSMITTER PORTION

Test equipment required:


Power Supply: 13,8 V	AF SSG	RF VTVM	DC AM-meter
AF VTVM	FM Linear Detector	Oscilloscope	RF Power Meter
Dummy Load, 50 ohm

Preparation alignment:


VR112	Clockwise
VR113	Counter Clockwise
VR103	Clockwise
SWR/CAL	Clockwise
RF Gain	Middle position
PA SW	Off
INDIC SW	RF
Mic Gain Sw	Off
RF Power	Max.
Frequency	28.000 MHz

Step	Condition	Adjustment	Procedure
1	USB No Mod.	VR13	Remove the B002 (PB-100) from Main PCB. Connect a DC AM Meter to TP4 (+) and TP3 (-). Adjust VR13 for 50 mA reading on the DC AM Meter.
2	USB No Mod.	VR14	Remove the B002 (PB-100) from Main PCB. Connect the DC AM Meter to TP4 (+) and TP2 (-). Adjust VR14 for 50 mA reading on the DC AM Meter
3	USB 1 mV Mod.	L25	Connect a RF Power Meter to Ant.jack. Connect a RF VTVM, an Oscilloscope and an RF Linear Dectector across an Dummy Load to the RF Power meter. Adjust L25 for maximum reading en the RF VTVM. During this step, set the AF Oscillator so that the output is less than 20 V. Repeat this step two times.
4	USB 30 mV Mod.	VR5	Adjust VR5 for 32.5 V reading on the RF VTVM.
5	USB 30 mV Mod.	VR7	Adjust VR7 so that the carrier leakage at USB and LSB become minimum and almost equal.
6	CW No Mod.	VR4	Connect a SW between Pin 8 and 9 of ACC connector. When turn on the SW, adjust VR4 for 21 Watt reading on the RF Power Meter.
7	AM No Mod.	VR8	Adjust VR8 for 10 Watt reading on the RF Power Meter
8	AM No Mod.	VR12	Adjust VR12 so that "9" LCD just light on.
9	AM 1 kHz 30 mV Mod.	VR6	Adjust VR6 to obtain the 85% negative reading on the Oscilloscope.
10	AM 1 kHz 1 mV Mod.	VR9	INDIC: MOD. Adjust VR9 so that "9" LCD just light on.
11	FM 1 kHz 30 mV Mod.	VR3	Adjust VR3 for +/- 3 kHz deviation on the FM Linear Detector.
12	CW No Mod. Vol.: Max.	VR10	Connect an AF VTVM across a Dummy Load (8 ohm) between Pin 1 and Pin 2 of ACC connector. When turn on the SW, adjust VR10 for 0.4 V reading on the AF VTVM.