[time-nuts] SRS FS 730
Charles P. Steinmetz
charles_steinmetz at lavabit.com
Fri Mar 22 19:17:33 EDT 2013
>Switch mode power supply ?
>FLL or PLL loop?
It's a distribution amplifier, so one wouldn't expect it to have an
FLL or PLL loop -- and the manual does not mention one. However,
according to the manual it does have (in sequence) a low-Q LC input
filter, a rather aggressive differential-pair limiter, and a high-Q
filter (a 10.7 MHz IF transformer tuned down to 10 MHz). The signal
then goes through a 2.4x IC amplifier to seven output buffers, each
comprising three emitter followers in series. There is a low-pass
filter (11.5 MHz) and a 20 MHz notch filter on each output. [This
all assumes that Magnus was using an Option 1, 10 MHz unit, which
appears to be the case from his description of the circuit.]
Magnus -- I have a manual, but no schematics. If you scan and post
the schematics somewhere (e.g., Didier's site,
<http://www.ko4bb.com/Manuals/01)_Upload_Instructions.php>), we will
be in a better position to help.
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