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| Subject: | LF: Improved Direct LF Upconverter |
| From: | Andy Talbot <[email protected]> |
| Date: | Sun, 31 Oct 2010 14:08:26 +0000 |
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New version of Direct LF Upconverter based around bus switch devices now available
The Mark 2 version uses a double balanced mixer approach with a pair of quadrature bus switches, and offers improved carrier rejection without the need for an accurately wound output transformer. It will accept either quadrature I/Q inputs from suitable software for optimum sideband rejection, or alternatively an all pass phase shift network forms the I/Q drive for the upconverter from a single tone input in the range 1300 - 1800Hz. This can achieve 50dB sideband rejection for a single tone, or 40dB over a bandwidth of a couple of hundred Hz.
Details of both the original single balanced and new DB versions can be found in http://www.g4jnt.com/LFUpconv.pdf (900k .PDF file)
A PCB layout for the Mk2 is included; if you need Gerbers, or an EasyPC PRO .pcb file, contact me directly.
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