"Howard" wrote in message
om...
Hello and thanks for reading this post.

I am seeking a schematic for a downconverter for 1691 mhz for the
purpose of receiving weather sat info.

You're probably better off using stripline techniques, and for that you
could scale a 1296 converter design. There aren't a lot of plans around for
those anymore, either, because most people build a kit, and most of those
are transverters. There may be an index of articles from back issues of Ham
Radio. There are better active devices available than during the heyday of
that magazine, but the design techniques haven't changed a lot. The picture
at the bottom of this page http://www.ussc.com/~uarc/utah_atv/ka7oei_a.html
shows an example stripline 1296 receive converter. As your antenna will be
pointing skyward you may not need the bandpass filtering shown in the
lower-right corner of the board.

You might find a used 1296 converter you could hack, or some help in
building what you need, from the friendly hams at the Rochester VHF Group
down the road from you. Down East Microwave (downeastmicrowave.com) has
low-noise preamps for 1691, but no converters.

According to this site: http://daltron.com.pg/~nq/1691.htm, a good antenna
and preamp will work with even a wideband communications receiver. That
might be an easier route.

73,

"PM"