Телеграфные ключи и манипуляторы от UR5CDX и M0EDX

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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.

 

RECEIVER PORTION


Test equipment required:

     

Power Supply: 13,8 V

Dummy Load 8 ohm

AF VTVM

Oscilloscope

HF SSG:

28.000 MHz

1 kHz

30% Mod.


Preparation alignment:

     

NB SW

Off

   

PA SW

Off

   

Beep SW

Off

   

VOLUME

Max.

   

RIT

Middle position

   

Mode

AM

   

Squelch

Min.

   

DX/LOC

DX

   

Frequency

28.000 MHz

   

Step

Condition

Adjustment

Procedure

1

AM
SSG 40dB
1 kHz Mod.

L1 L2 L3 L4 L5 L6

Alignment of sensitivity. Adjust coils for maximum reading on the AF VTVM.

2

AM
SSG 66dB
1 kHz Mod.

VR2

Alignment of Squelch. Set Squelsch to maximum. Adjust VR2 so that the squelch just breaks.

3

AM
SSG 46dB
No Mod.

VR1

Alignment of S-meter. Adjust VR1 so that "9" LCD just lights on.

4

FM
SSG 1 mV
1.5 kHz Dev.

L401

Adjust L401 for maximum reading on the AF VTVM.

5

AM
SSG 1 mV
Noise Gen.

L203

Adjust L203 for maximum reading on the AF VTVM. Noise Generator output: 50 Hz SQ wave 2 V P-P.

       

 

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 (Q1) with an 2SC2999 (or similar low noise and high gain transistor) to achieve this improved signal to noise ratio.
Re-Adjust L101
The gain will improved with more than 6dB with the same signal to noise ratio.

 

PLL and CARRIER OSCILLATOR PORTION


Test equipment required:

       

Power Supply: 13,8 V

Oscilloscope

Frequency Counter

DC Voltmeter

 


Preparation alignment:

     

PA SW

Off

   

RIT

Middle position

   

Mode

AM

   

Frequency

28.000 MHz

   

Step

Condition

Adjustment

Procedure

1

AM
RX

L315

Connect the Oscilloscope and Frequency Counter to TP306. Adjust for 6.200 MHz +/- 20 Hz

2

AM
RX

L318

Connect the Oscilloscope and Frequency Counter to TP304. Adjust for 38.6950 MHz +/- 20 Hz.
Check:
USB : 38.6975MHz
LSB : 38.6925MHz

3

AM
RX

L317

Connect the DC Voltmeter to TP 303. Adjust for 6.5 V +/- 0.1 V

4

CW
RX

L117

Connect the Oscilloscope and Frequency Counter to TP1. Adjust for 10.695 MHz +/- 20 Hz

5

LSB
RX

L118

Connect the Oscilloscope and Frequency Counter to TP1. Adjust for 10.6925 MHz -40 Hz to + 0 Hz

6

USB
RX

L116

Connect the Oscilloscope and Frequency Counter to TP1. Adjust for 10.6975 +/- 20 Hz

7

USB
RX

VR111

Connect the Oscilloscope and Frequency Counter to TP5. Adjust for 38.6975 +/- 20 Hz

       

Adjustment

Description

VR304

Amplifier Gain Adjustment

 

Only in President HR2600

   

Adjustment of Balanced Mixer`s

Adjustment

Description

VR301

DC Balance Adjustment for Balanced Mixer

L303

9-10MHz Signal Balance Adjustment to Mixer

L304

14-18MHz Signal Balance Adjustment to Mixer

 

Connect Oscilloscope to IC304 pin 2.
Adjust VR301 for correct DC-balance.
Adjust L303 for maximum signal.
Adjust L304 for maximum signal.

Adjustment

Description

VR302

DC Balance Adjustment for Balanced Mixer

L313

22MHz Signal Balance Adjustment to Mixer

L314

36-40MHz Signal Balance Adjustment to Mixer

 

Connect Oscilloscope to IC305 pin 2.
Adjust VR302 for correct DC-balance.
Adjust L313 for maximum signal.
Adjust L314 for maximum signal.

BandPassFilter Adjustment

Adjustment

Description

L310

High Band Adjustment

L319

Low Band Adjustment

 

Connect Oscilloscope to Output Terminal for VCO.
Adjust L310 for maximum at 29.000MHz.
Adjust L319 for maximum at 28.500MHz.

Band

Frequency Range (Without ChipSwitch or Frequency Modification)

A

28.000 to 28.4999 MHz

B

28.500 to 28.999 MHz

C

29.000 to 29.4999 MHz

D

29.5000 to 29.699 MHz

Output Frequency from PLL-PCB to Analog-PCB

Fvco = F + 10.6950MHz + a
F = Transmitting and Receiving frequency
Fvco = VCO Output frequency
a = 0kHz for CW/FM/AM
a = +2.5kHz for USB
a = -2.5kHz for LSB

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