2m 144 mhz 146mhz receiver

2m 144MHZ 146MHZ RECEIVER

w w w . 4 s 5 g s . g a y a n @ g m a i l . c o m

4S6GGS

Her I am use MC3357 / LA1186 in this 2m Receiver This

experiment was done when I was a SWL lesson

145.625MHz Repeater / 145.650MHz Repeater 59 Signal

Repot With my Home brew ground plan Antenna 10 feet

height Excellent Sensitivity without preamp . Local osc are

very stable when I on Rx 2min in drift +- 50khz and get very

stable in 24 hrs

2m 144MHZ - 146MHZ RECEIVER

4S6GGS Email . [email protected] http://4s6ggs.blogspot.com

Her I am use MC3357 / LA1186 in this 2m Receiver

This experiment was done when I was a SWL lesson 145.625MHz Repeater / 145.650MHz Repeater 59

Signal Repot With my Home brew ground plan Antenna 10 feet height Excellent Sensitivity without

preamp . Local osc are very stable when I on Rx 2min in drift +- 50 kHz and get very stable in 24 hrs.

This Receiver good perform for SWL / Ham operators / Monitor 2m band.

MC3357 DESCRIPTION

Includes Oscillator, Mixer, Limiting Amplifier,

Quadrature Discriminator,

Active Filter, Squelch, Scan Control, and Mute

Switch.

• Excellent Sensitivity: Input Limiting Voltage –

(– 3.0 dB) = 5.0 mV (Typical)

• Low Number of External Parts

Required

LA1186 Features and Functions

• Contains RF amplifier, MIX, OSC, AFC diode.

• Operating voltage: 1.8 to 8.0V.

• Improvement in cross modulation characteristic

due to the use of double-balanced MIX.

• Improvement in strong input characteristic.

• Less spurious radiation from local OSC.

• TV (1 to 12 channel) receive capability.



2m RECEIVER SCHEMATIC DIAGRAM



Part list

C1 100uF

C2 220uF

C3 10uF

C4 20pF

C5 1uF

C6 0.47uF

C7 10uF

C8 220uF

C9 20pF

C10 10uF

Part Value

CX1 0.1uF

CX2 0.1uF

CX4 0.001uF

CX5 0.1uF

CX6 0.01uF ***

CX7 0.22uF

CX8 0.68uF

CX9 470pF

CX10 470pF

CX11 0.1uF

CX12 22pF

CX13 0.1uF

CX14 20pF

CX15 10pF

CX16 0.1uF

CX17 0.1uF

CX18 120pF

CX19 50pF

CX20 5pF

CX21 5pF

CX22 0.001uF

CX23 0.001uF

CX24 5pF

CX26 30pF

CX27 0.001uF

CX28 30pF

CX29 0.001uF

CX30 100pF

CX31 0.001uF

CX32 0.01uF

CX33 0.001uF

CX34 0.001uF

CX35 0.1uF

Part Value

D1 1N4004

D2 1N4148

D3 1N4148

D4 1N4148

D5 1N4148

D6 1N4148

IC1 LM386N

IC2 MC3357

IC3 LA1186

IC4 LM7805

IC5 LM7805

L1 1mH ***

L2 20SWG 3T Dia 7.5 mm

L3 20SWG 3T Dia 7.5 mm

LED1

Q1 10.245MHz crystal

QF2 10.7MHz Filter

SP1 8R 1W Sony Sp

T1 BC547

T2 BC547

T3 BC547

TR1 455KHz IF IFT

TR2 10.7MHz IF IFT

R1 10

R2 1k

R3 22k

R4 10k

R5 2.2k

R6 220k

R7 10k

R8 10k

R9 1.5k

R12 100k

R13 1k

R14 33k

R15 47k

R16 2k

R17 2k

R18 22

R19 22

R20 100k

R21 150k

R22 2.2k

VR1 10k

VR2 47k

VR3 20k

VR4 10k



PCB side Size . H50.8mm / 103.33mm



Component side Size . H50.8mm / 103.33mm



10.7MHz Filter Preamp Board

Part list

C1 10n R3 *

C2 10n R4 1k

C3 10n R5 100

C4 4.7n R6 10k

C5 10n R7 47k

QF1 10M7 T1 C1923

R1 680

R2



Part list

Assembly variant:

Part Value

C1 10n R1 56

C3 10n R2 470

C4 10n R5 470

C5 10n R6 220k

QF1 10M7 T1 C1923



10.7MHz P.PA Board PCB

H24.08mm / W 19.17mm

VCC LA MC GND



This Receiver good perform for SWL / Ham operators / Monitor 2m

band. Very stable LOCAL VCO.

First on the Rx Normal power on LED light up half (the power indicator )

then Tune the our Repeater 145.625MHz in lesion the signal wait for

1-5min fine tune the Rx then ok now can use contuses 24hour

…………….Try it and sent me a Photo and result via E mail



Normal power on LED light up half / the power indicator

145.625 - 600 Repeater Signal Receive LED light up full. S meter run

2m 144 mhz 146mhz receiver

Design

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