VHF RF Transmitter 87MHz - 108MHz

435

05:27:15

Transistors left to right:

BF240
2N3866
2SC1971


KV1310 Dual Varicap:

15pF per diode - 7V - 108MHz
25pF per diode - 5V - 97.5MHz
40pF per diode - 2V - 87MHz
VCO Slope - 4.2MHz/V


Freq ------ Pout --- Pin --- Efficiency

87MHz - 5.5W - 13.9W / 40%
97.5MHz - 7.2W -  13.3W /   54%
108MHz - 6W -  9.72W / 62%

Ideas for PLL control: 

TSA5511 PLL Controller. 
NodeMCU for display and control of frequency. 

published 3 years ago

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