Refer to the 40/80
We built the 40/80 from the ground up with a little discussion about the components as we went. The dual gate mixer and DBM are both used in the 40/80.
We used bought transformers and wound our own. The binocular was the best. It is something about the signal isolation with the binocular that made them the winner. (this was our perception.)
The center tap on the transformer connected to the LO is grounded. If you take the signal from it you will get feed thru of the LO. The binocular cores helped with the signal isolation too.
The first mixer uses the dual gate. So you have an example of the DBM and dual gate mixer in the 40/80. If you follow the link at the top of the page it will take you back to the time the project was on going. From that point you can back up thru the development.
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