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20m Projects - Transmitters

Click to enlarge14,068 Mhz bilateral transmitter by LY3LP
Some MOSFET's BS170 requires a resistance from source to gate. It should be approx.3kOhm and needed to be individually selected. Coils on ring T37-6 are tuned for resonance , then TX signal is clear.Output power is abt 50mW ,if my power meter shows correctly. It easily lights LED , telegraphing tone also is clear.
http://sa555.blogspot.com/2010/02/14068-mhz-bilateral-transmitter.html

Click to enlarge3 stage BS170 14MHz TX by LY3LP
 
http://sa555.blogspot.com/2010/02/3-stage-bs170-14mhz-tx.html
 

Klik voor vergrotingBilateral 14,096 Mhz TX by LY3LP
G3ESP ideas...a wide range VXO...
http://sa555.blogspot.com/2010/01/bilateral-14096-mhz-tx.html
 

Click to enlargeBS 170 FET...two stage QRP 14,068 MHz TX by LY3LP
 
http://sa555.blogspot.com/2010/02/bs-170-fettwo-stage-qrp-14068-mhz-tx.html
 

Click to enlargeParallel BS170 14,068 MHz TX by LY3LP
 
http://sa555.blogspot.com/2010/02/parallel-bs170-14068-mhz-tx.html
 

Click to enlargeQRP AM(cw) Transmitter for the 20 meterband RE-TX02HF20 by ON6MU
In this project, you will make a simple low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator.
http://users.belgacom.net/hamradio/schemas/transmitter_QRP_20meterband_on6mu.htm

Click to enlargeQRP Transmitter with VXO by PA2OHH
Normally these designs have only two transistors. A good example is My first QRP rig that can be found somewhere else on this site. Here the VXO (Variabele X-tal Oscillator) has a tuning range of 16 kHz.
http://www.qsl.net/pa2ohh/98tx20m.htm

Click to enlargeSSB Transmitter by SMØVPO
This project is relatively simple to construct, and will give a "presentable" SSB signal on the lower HF amateur bands.
http://www.sm0vpo.altervista.org/tx/ssb-tx1.htm

Click to enlargeStep VFO by SMØVPO
This project has two different inputs, one for 600Hz FSK and one for keying the oscillator. It is based upon a crystal so the HF stability is excellent.
http://www.sm0vpo.altervista.org/tx/hf-osc1.htm


Creation date : 12/08/2007 @ 21:10
Last update : 06/10/2014 @ 23:20
Category : 20m Projects
Page read 18644 times


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