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Simple Short-Wave Transmitter

Simple Short-Wave Transmitter

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C1

0.1μ

C2

470μ

35V

R5

10K

C3

0.1μ

R6

1M

R1

1K

T2

BD139

ANTENNA

RFC1

C4

0.1μ

T1

BD677

X1

T4

BC548

R2

33K

L1

VC1

310P

1/2J GANG

C5

100P

VC2

22P

C6

22P

RFC1 = 30 TURNS OF 24 SWG COPPER WIRE ON 6MM DIA. AIR CORE.

*X1 = 16 TURN PRIMARY, 3 TURN SECONDARY USING AN IFT CORE TUNING SLUG.

L1 = 4 TURNS OF 22 SWG COPPER WIRE ON 15MM DIA, AIR CORE.

R3

39K

C7

470P

C8

470P

R4

100Ω

C9

0.1μ

COND.

MIC

T3

BC548

+12V

GND

Simple Short-Wave Transmitter

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publish time: 2020-09-22
Kiraaaa

With ½Jgang, the frequency of this low-cost shortwave transmitter can be adjusted from 10 MHz to 15 MHz. The capacitor VC1 determines the carrier frequency of the transmitter, combined with the inductor L1. At the same time, VC2 can be used for frequency adjustment. The carrier is amplified by the transistor T4 and coupled to the RF amplifier transistor T1 (BD677) through the transformer X1.

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