[time-nuts] FRS-C TTL / sine outboard filter question
Mike S
mikes at flatsurface.com
Wed Jun 23 21:12:20 UTC 2010
At 04:19 PM 6/23/2010, Leigh L. Klotz, Jr. WA5ZNU wrote...
>If you have these values we can document the rest of this process in
>one
>place.
>
>10 MHz sine TTL
>L1 ?.? uH L1 OMIT
>L2 1? uH Replace with R23 130 OHM 1 WATT
>R16 ?10 OHM NOM 100 OHM NOM
>R17 1.0K 274 OHM NOM 1/4W
>R18 1.0K OMIT
>C8 47pF NOM JUMPER
>C9 6800pf NOM 0.47 uF NOM
>C16 0.1uF [1uF: see above] JUMPER
>C17 240pF NOM NP0 OMIT
> INSTALL JUMPER A-0
Here are the values I used.
L1 6.8 uH
L2 15 uH
R16 910 Ohm nom
R17 1.0K nom
R18 1.0K
C8 47 pF nom
C9 6800 pF nom
C16 0.1 uF (but 1.0 uF provides much cleaner signal)
C17 240 pF NPO nom
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