[eagle] Re: 70 cm Receiver IF Spurs - Problem Solved
eagle at howardlong.com
Sat Jun 16 11:11:51 PDT 2007
> The 70 cm Receiver spur problem has been solved.
> Click here
> for details.
This is very interesting. FWIW in the original SDX PSU design I had in San
Francisco last year is an SMPS using the LM2672 device. These can be fitted
with an AC coupled SYNC signal to override the internal default SMPS
frequency. I selected 375kHz for my unit (6MHz divided by 16) to ensure its
harmonics were outside the 10.7MHz IF passband. If the external SYNC fails
the internal SMPS oscillator takes over.
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