Tunnel Diode Oscillator

[Joseph Bento]

Hi Guys,

This was already shared with some of you.  My first tunnel diode oscillator!

It works... Oscillation is at about 20MHz.  Not exactly a good circuit 
for a solderless breadboard, but it at least exhibits the behavior I was 
seeking.  I may need to investigate a proper frequency counter at 
Hamvention.  Right now, using 1/x on the scope gives a rough estimate.  
My coil and cap are not the values on the schematic.

I've already discovered that the power supply in a tunnel diode circuit 
is critical.  Since these Russian diodes I ordered are GaAs, that may 
affect the operating characteristics as well.  I don't know...  that's 
something I'll need to learn.  My source voltage to achieve oscillation 
is about 3v.  The schematic shows 1.5v.   I assume the old General 
Electric diodes as in the schematic are probably germanium.  I may need 
to seek out a couple samples.

Now I'll have to move on to a nice QRP 40m transmitter using proper 
construction techniques.  :-)

Perhaps Brian will consider the talk on tunnel diodes for the AMRAD picnic.

Joe, N6DGY






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