> As Adrian and Bob pointed out, W. J. Riley's site has all the information > needed to make the higher cost TPLL version he did including his PCBs.
Ah, sorry, I didn't see that 2nd PDF! I see the design is significantly different than the TPLL that you made. Any idea why? > The bigger mystery seems to be how easy a TPLL can be built without loosing > performance. > One version of the TPLL tester only needs 8 circuit parts plus + Power > supplies etc, > These are all clearly specified on the bottom block diagram, dated June 7, > 2010 at > http://www.ke5fx.com/tpll.htm > And even that complete working, simple version, is good enough that the > performance is still mostly limited by the HP10811 Reference Osc and not the > TPLL circuit. > > BOM for "Extra simple TPLL" > Nothing is critical, performance is determined by the Ref Osc. > 1) Phase detector = SYPD-1 > 2) 100KHz LPF = two each 220 ohm in series and two 0.0047uf caps to gnd > 3) Amp = OP-27 Pin 3 is input, pin 6 is output > 4) Amp feedback gain = + 300 set using a 30K feedback and 100 Ohm resistor > to gnd > 5) 20 Hz LPF = 8K ohm series R and 1uf to gnd > 6) Ref Osc = HP10811 > 7) A slow mv DVM and/or a 16 bit ADC sampling at 100Hz or more. > 8) misc connectors, PS, S/W, etc. > > The configuration of the TPLL 1.0 that John tested, uses a 3dB and 5dB pad > for isolation, (no real need for Osc buffers), > and has a higher closed loop PLL bandwidth using an op37 with more gain, (a > tighter TPLL) > This can be seen by clicking on the underlined "Here" of John's report next > to Fig 1.7 at > "Warren's annotated block diagram can be seen HERE." We've see http://www.thegleam.com/ke5fx/tpll/TightPLL_BB.gif before and that's partly why I wrote what I wrote. It's high level and pretty far from a schematic/BOM. However, your comments 1 - 8 begin to address that. Thanks much. You've also talked about TPLL 1.0 and 2.0, as if we should all know what they are; is there a comprehensive description of those; something detailed enough that a random time nut could build one? Thanks, /tvb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
