[Elecraft] K3 H Mode Mixer

[I7SWX]

Hi Jack,

OK for everything.  I do not know the Bruhan's VLF converter but I guess I understood how it maybe made.
I have used an MC4066 for an SSB demodulator in my modified FT726R. The Ron is very high, on the hundreds ohm. I have also used the 74HC4066 to replace it and also used it as a mixer for a diect conversion rx. This IC has a lower Ron, severan tens of ohms. The Fst3125 presents, usually, an Ron of around 5 ohm, this is important for a lower conversion loss.
I would be interested on the circuit diagram od the Bruhan's VLF converter, there is always something to learn.

Thanks and best 73

Gian
I7SWX


>________________________________
>Da: wa9fvp [via Elecraft] <ml-node+s365791n6896967h84 at n2.nabble.com>
>A: I7SWX <i7swx at yahoo.com>
>Inviato: Domenica 16 Ottobre 2011 5:18
>Oggetto: Re: K3 H Mode Mixer
>
>
>The reason that I ask is because I have a Bruhan's VLF converter that uses, what he called, a ring mixer.  The Burhan's converter has a MC4066 analog switch where the control inputs of two fet switches are inverted and the other two are non inverted.  When I saw the schematic of the H mode mixer, it reminded me of the Burhan's VLF converter.  The difference is the transformers that Burhans used. They  were audio transformers that covered the VLF range.   
>Jack WA9FVP
>
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