Useful link:
**broken link removed**
Also I suggest to see rest on Danyk web **broken link removed**
Per toroid, you can wind them any way you want. There is no interaction between the two toroids. All that matters is that per toroid, you observe the blobs on the schematic so that you can wire it into your circuit correctly.
If you wind two windings on a toroid, and mark the beginnings of each winding with some marker or paint spot, thenIf I find problems on the lower part (oscillator) I can swap the connections of one of the two toroids
If you wind two windings on a toroid, and mark the beginnings of each winding with some marker or paint spot, then
you can relate those to the blobs on the schematic, so no need to swap connections, because you will be 100% sure, since
you wound the windings yourself.
Now the only risk is that you may not be able to identify windings, and that can be resolved by using two different colors
of enamelled wire, or use a continuity tester to buzz them out, or have different lengths of wire ends so you don't forget,
or any other manner you wish.
Are you driving enough oscillator voltage into the coils? In order to work as mixers they must be driven hard so the cores saturate. The original memory cores were specifically designed to saturate at low current, that's how they stored a bit of data. I wonder if you are seeing leakage through the pi filter and the transistor is working as a detector instead. I presume you are using a germanium transistor with very low fT , the 2N35 has a unity gain frequency of only 400KHz.
While the working method is interesting, you do realize I hope that it is very inefficient compared to other mixer systems.
Brian.
It sounds like you are doing it right with the signal generator but I would be cautious about the amplified speakers if you have not used the LPF. I have 'computer' monitor speakers here that can even pick up my cordless phone on 1.9GHz - and that's after I opened then and fitted filters on the power wires, input wires and an LPF on the input of the amplifier. They also make rather good monitors for my Ham radio transmitters although I wish they didn't :shock:
It would be worth trying the LPF just to be sure, 2V of RF from the oscillator is quite a large amount to have connected anywhere near an amplifier.
Brian.
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