Murray, I dont remember the detail but we used Clicklock a few time on LF and I think Steve MacDonald VE7SL built a GUI front end to make it a bit more appealing. He has a web site. I dont seem to have it loaded on this machine any longer.
Alan G3NYK ----- Original Message ----- From: "Murray Greenman" <[email protected]> To: <[email protected]> Sent: Thursday, June 25, 2009 7:39 PM Subject: [time-nuts] Long Wave Receiver ideas > Poul, > Regarding Clicklock. Yes, in a sense Clicklock is a lock-in amplifier. > However the really special thing is that it completely compensates > (within reason) for the drift in ALL the oscillators in your receiver > and/or converter, so that it becomes GPS locked. It does this by > comparing the phase of harmonics of 1pps as they arrive at the receiver > with the phase of the 1pps itself. It uses an NCO to down-convert to > zero Hz. There is obviously an advancing phase with frequency in the > 1pps harmonics if the down-converted frequency is high, and the NCO is > shifted to compensate. > > It will also therefore also compensate for changes in phase and delay > through the preamp, feedline and receiver filters. > > If you look at the examples on the reference I gave, > http://www.qsl.net/zl1bpu/ZL2AFP/CLICK/click.htm, you'll see there's a > phase plot which shows the integration of I and Q samples, plus phase > and power plots which are achieved by maths from the I and Q followed by > 'leaky integrators'. That bit was my contribution. The whole idea > originated with Peter G3PLX, the source of many good ideas. > > Give it a try - it's quite a tricky bit of software to drive. > > Regards, > Murray Greenman ZL1BPU > > > _______________________________________________ > 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. _______________________________________________ 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.
