on the page http://home.online.no/~la8ak/d3.htm I've shown two
versions for the Butler oscillator, but the first is a later version
with diode limiters to improve the stability.

Believe I've seen an article or a note about using diode limiters for
the second type of Butler oscillator, but I am unable to trace the
document now

Any suggestions?

73
Jan-Martin
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J. M. Noeding, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/c.htm