50 MHz RECEIVE CONVERTER


This is a six metre version of the two metre converter on my web page. I used 3SK45 mosfets for Q1 and Q2.

 

RF AMP/MIXER

 

 

PCB

 

 

CONVERTER SCHEMATIC

L1, L2, L3 all 6 turns on Toko 10mm former (old IF transformers.) T1, same as the 2M converter, 10t/2t.

 

 

The 32 MHz local oscillator is a standard 5v 32 MHz clock oscillator (oscillator in a tin can.) If only all schematics were as easy to draw as this one :-)


pin-out

 

The converter output frequency is 18 to 18.500 MHz to cover 50 to 50.500 MHz. If your HF receiver doesn't cover 17M, try using a 22 MHz oscillator and changing the 47pF capacitor to 33pf. You can then use 10 metres as the IF, 28 to 28.500 MHz.

 

DANGER HIGH VOLTAGE! This converter is not likely to kill you, but you could very easily kill it! If you are using a HF transceiver as the IF, make sure that you don't accidently operate the transmitter. A few watts of RF into the IF output will almost certainly destroy Q2.


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