Can I buy pre-made balun transformers for a double balanced ring diode mixer?

[perplexabot]

Hi all. I started a thread a while back about RF mixer design. I didn't know what to do or what design to choose. You guys laid some options for me and after some research and time I have finally decided that I will go for a double balanced, ring diode topology. Here is a schematic from google:

So I think I get the general idea of the circuit and I am ready to simulate it and build it. I am wondering about one thing though, the two balun transformers... Is it possible to buy them already made? If so, how do I choose what I need? I would hate having to wind them myself as my hands do not allow me to undertake such delicate work.

Thank you PF.

 

[sophiecentaur]

It depends on the frequency you are working at (for the cost) but I think they are available at all popular frequencies and would probably work better than a home made version (coil winding is pretty skilled and balance is important).
See these links
1, 2, and many others.

 

[davenn]

I agree with sophiecentaur

These things are built in a tiny metal box 1" x .5" x .5" and cost peanuts. You would never be able to achieve anywhere near the performance that a commercial one would give you.
You would be better off putting your efforts to other parts of the RF circuits
The SBL- 1 ( and SBL-1X) is a wideband mixer I have used often over the years
Have also used a variety of others that cover other frequency ranges

cheers
Dave

 

[perplexabot]

Thank you guys for your great replies. After looking at the links you have provided, I found some baluns that have the frequency range that I am looking for. I will be ordering a pair soon.

EDIT1: I think I will get this one: http://www.coilcraft-cps.com/pdf/ae458rfw.pdf OR http://www.bourns.com/pdfs/RF.pdf

EDIT2: Sorry for the multiple edits...

 

[sophiecentaur]

I have played with audio frequency baluns and mixers. Good fun: Ex terrrrrminate! (Dr Who / Dalek, quote, for people not in the UK)