EMRFD Message Archive 1354

Message Date From Subject
1354 2008-01-22 18:30:12 ter753 diode ring mixers
you should use schottky diodes when building dbm mixers!. try using
them for your next mixer and let the group know how you get on. best
73s, terry EI3IZ.
1356 2008-01-23 06:55:21 Johan H. Bodin Alternative to diode ring mixers
Fast "analog switches", designed to switch computer bus signals, can be used to
make extremely good mixers - much better than diode ring DBMs! I don't know if
this is "old news" but Martein PA3AKE has made an impressive research in this
area and it is well documented on his web site:


Johan SM6LKM
1357 2008-01-23 06:55:33 py2fzu2005 Re: diode ring mixers
I have tried 1N5711 and BAT83 (the last being cheaper and more readily
available in Brazil). Both with excellent results on 3.5 MHz, 7 MHz,
21 MHz and 28 MHz bands. 1N5711 should be better
1359 2008-01-23 13:16:03 rotfunkblau Re: diode ring mixers
hmm ...

... just had a look at the spectrum analyser pictures.
I could not believe that there is no relevant suppression of the LO
frequencies. Could there be a problem in the windings? I mean
winding direction or connecting wrong ends of the windings?
My feeling is that there must be at least 15dB of LO carrier
suppression for even the worst DBM??? Do you use ferrite cores
or iron powder cores (should be ferrite)???

Only a few thoughts...


1360 2008-01-23 16:53:18 Allison Parent Re: diode ring mixers