Hi Peter,
I don't think the duty cycle feeding the sychronous output counter will
be a problem.
Single-edge triggered flipflops for that counter (400 kHz in, 100 kHz
out)... doesn't matter where the "other" edge is.
Out of curiosity : You aren't building a Loran-synchronized 10 MHz
reference by chance ?
Cheers,
Wolf DL4YHF ( -> DF0WD soon, on 472.5 kHz in CW )
Am 03.08.2012 18:30, schrieb pws:
Hi,
I found some 10 MHz double-OCXOs in the junk-box and
I need two 100 kHz LO-signals at 90deg. of phase shift.
The idea is using 74HC390 for dividing down to 400 kHz
(25:1) feeding a phase shifting network consisting of
two flip-flops (4:1), commonly found at SDRs.
Q: Does that work or could I run into trouble due to the
non-symmetrical output train from the 25:1 dividers?
May be a stupid question but it's ~40 years ago when I
was busy doing nasty things with flip-flops [^_^]
Peter, df3lp
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