[time-nuts] Long Wave Receiver ideas

[Alan Melia]

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" <Murray.Greenman at rakon.com>
To: <time-nuts at febo.com>
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
>
>
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