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Agc For Easy Bitx

The document provides a detailed guide for assembling an Automatic Gain Control (AGC) module for the Easy BITX, including a schematic, components list, and adjustment flowchart. It specifies the necessary components, their values, and types, as well as instructions for wiring and mounting the AGC. Additionally, it emphasizes the importance of testing and fine-tuning the AGC before final assembly.

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amirsarifudin
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18 views10 pages

Agc For Easy Bitx

The document provides a detailed guide for assembling an Automatic Gain Control (AGC) module for the Easy BITX, including a schematic, components list, and adjustment flowchart. It specifies the necessary components, their values, and types, as well as instructions for wiring and mounting the AGC. Additionally, it emphasizes the importance of testing and fine-tuning the AGC before final assembly.

Uploaded by

amirsarifudin
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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AGC FOR EASY BITX

AGC Schematic

1
AGC PCB Silkscreen

2
AGC AND S. METER COMPONENTS LIST
EASY BITX

VALUE TYPE QUANTITY CODE


100 E RESISTOR 0.25 W 1 BROWN BLACK BROWN
10K RESISTOR 0.25 W 4 BROWN BLACK ORANGE
100K RESISTOR 0.25 W 1 BROWN BLACK YELLOW
150K RESISTOR 0.25 W 2 BROWN GREEN YELLOW
220K RESISTOR 0.25 W 1 RED RED YELLOW
1M2 RESISTOR 0.25 W 1 BROWN RED GREEN
15K RESISTOR 0.25 W 1 BROWN GREEN ORANGE
1K RESISTOR 0.25 W 1 BROWN BLACK RED
5K PRESET PRESET 1 502
2K2 PRESET PRESET 1 202
50K PRESET PRESET 2 503
10K PRESET 1 103
100nF (0.01) CAPACITOR 1 103
IN4148 SILICON DIODE 3
2.2 uF ELECTROYTIC 2 25V
CAP
47uF ELECTROYTIC 2 25V
CAP

LM324 IC 1
IC SOCKET 14 PIN DIL 1
BC 547 TRANSISTOR 1 PNP
LED 1 LED 1 WHITE
3
BERG PIN For AGC jumper fast 1 SET
AND COVER slow

PCB AGC 1 1 GLASS EPOXY


CONNECTORS 2 PIN 3 WITH WIRE
VU METER 250UAMoving 1
coil movement

RELIMATE WIRES AND PINS 4 NOS 2 PINS


CONNECTORS

INKITS
Agc full view

The AGC is based on the LM234 IC. We have used this AGC in our earlier
Bitx kit and also it’s been used in ubitx kits.

4
INKITS

Led Mounted- 0.1 capacitor across VU meter for blocking RF pick up

INKITS
SM2 Brown Wire which is negative on meter and SM1 Red wire which is
positive on VU Meter.

This is the correct wiring. Overlook other pictures as in some pictures wires
are reversed.

5
Agc Adjustment Flowchart
Note: If you see that on adjusting R3A (50) the vu meter is not showing any
deflection in this case you need to adjust R5 (5K) simultaneously , as you see any
movement in meter needle then adjust R3A for maximum deflection and follow
the rest of the steps.

Follow the adjustment chart from Step 1 to Step 7 for adjusting the AGC.

6
Mounting AGC on Enclosure Front Faceplate

INKITS

SM1 SM2 Connected by wires to VU Meter. Reverse the Red and Brown wire.

7
INKITS
Full view of AGC circuit

8
INKITS
Led Mounted

INKITS
Clamp and brass stands for fitting AGC on front panel

9
INKITS
Vu Meter mounted with screw on top which goes to brass stand and clamp fitting.

Mount AGC module only when you have fully tested the AGC with your receiver
and fine tuned for use.

This completes the assembly of AGC kit.

10

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