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137 Khz CW transmitter
This is the TX freq logic, using a 27Mhz CB xtal and dividers to generate the 136 Khz The 27.407 Mhz is divides by 2 and then later by 10 in two 7493 counters then the 1.37035Mhz is feed into a 4017 decade counter, this one divide the freq by 10 again,Now the output freq is 137.035 Khz, the smart thing about the 4017 is that I can use the 10 outputs to generate the two outputs to my push-pull stage epending on how meny outputs used the pulse width can also be controlled
post 09 Apr 2024
Antenna 136KHz Links →
Power Amplifier for 136kHz 1kW
The design is somehow up-side-down. It is because the power FETs are mounted on the heat-sink which is on the top of the box
TX 136.000 Khz QRSS
Antenna ombrello per 136/475 khz
136 kHz Transmitter JUMA TX 136
JUMA TX136 is a digitally controlled CW transmitter for 136 kHz (2200 meter) amateur radio band. The transmitter is available as a component kit which inludes all the electrical and mechanical componets
136 kHz
UK Radio Amateurs received permission to operate on the new 136kHz band (135.7-137.8kHz) in February 1998
136kHz Activity
Canadian amateurs have full access to the 2200m and the to 630m bands without the need for special operating permission
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The design is somehow up-side-down. It is because the power FETs are mounted on the heat-sink which is on the top of the box
Antenna ombrello per 136/475 khz
JUMA TX136 is a digitally controlled CW transmitter for 136 kHz (2200 meter) amateur radio band. The transmitter is available as a component kit which inludes all the electrical and mechanical componets
UK Radio Amateurs received permission to operate on the new 136kHz band (135.7-137.8kHz) in February 1998
Canadian amateurs have full access to the 2200m and the to 630m bands without the need for special operating permission
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