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Date: Sun, 06 Jun 2010 20:14:00 -0500
From: "Mike.WE0H" <we0h@gmx.com>
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Subject: Re: VLF: RX stations in Canada and US?
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Hi Bob,

For sure those Mini Circuits mixers are good. I am laying out a circuit 
board right now for a transverter that uses one of those. It's the G3XBM 
500kc Transverter that Roger designed.
http://sites.google.com/site/g3xbmqrp/Home/500k

It'll run on lower bands with the tuned circuits worked on a bit. My 
current transverter uses the SA612 mixer. That one will be dedicated to 
1750 meters soon and my new G3XBM transverter will be for 600 meters.

Mike
WE0H




riese-k3djc wrote:
> Mike
> 
> that is very similar to the DBM mixer I built for LF
> using a simple and very stable Clock Osc it tunes to DC
> I was told that DBMs like 50 ohm terminations and I 
> put a 3 Db term on each port,,, all in all the
> converter did/does work well 
> I used a op amp for the rf stage in front,, not sure if it goes low but
> it did work
> to the stuff around 24 Khz well,, check around mini circuits
> for the DBM there are several to chose from
> 
> Bob K3DJC