Marantz CD63 & CD67 mods list

[avr300]

Couldn't think when I was asking, sorry. It's a "of cause", it gives no meaning terminating a 18M wavelength after just 5mm.

[awpagan]

Originally posted by avr300
Couldn't think when I was asking, sorry. It's a "of cause", it gives no meaning terminating a 18M wavelength after just 5mm.

i think we have all thought of it.

does make you wonder about the coax between dac and decoder
or the coax connectors for the tranport cable?

allan


ps more various calculators
http://www.audioscientific.com/Auto%...es%20Links.htm

[6h5c]

Hi guys,

Just for the record: the wave we are talking about is a square wave, with lots of higher order harmonics, that have much shorter wavelengths. Also the velocity in a cable is not light-speed, but less.

The point: the actual wavelength is about 20x? shorter than it seems at first glance. Not an issue here, just putting things into perspective. Am i being too much on the details? .

Regards,

Ray.

[avr300]

No no, its fine Ray. But I don't measure the waveform out of the Tent XO near square. I don't know whether my scope is the limit, but this is what I get from it. Doesn't seem to be a comperator output.

But I do agree, the square wave has much more energy than the sine.

/avr300

[awpagan]

Originally posted by avr300
No no, its fine Ray. But I don't measure the waveform out of the Tent XO near square. I don't know whether my scope is the limit, but this is what I get from it. Doesn't seem to be a comperator output.

But I do agree, the square wave has much more energy than the sine.

/avr300

thats what i get too, on a 20Mhz scope

need higher resolution scope to pick up 16.9Mhz square wave, all the higher order harmonics.

allan

[Fidelity Audio]

Originally posted by avr300
No no, its fine Ray. But I don't measure the waveform out of the Tent XO near square. I don't know whether my scope is the limit, but this is what I get from it. Doesn't seem to be a comperator output.

But I do agree, the square wave has much more energy than the sine.

/avr300

oooooo a Fluke scope meter nice

[6h5c]

Originally posted by avr300
But I don't measure the waveform out of the Tent XO near square. I don't know whether my scope is the limit, but this is what I get from it. Doesn't seem to be a comperator output.

/avr300

Hi avr,

Same as Allan, the square looks like a sine on my scope. If you do a search on this topic you can find more about it, and how to do a proper measurement with a terminated cable.

The closest I got to a square was on the scope of a friend of mine:

Ray.

[ash_dac]

Hi,

Not sure you need to square up the sine...

A simple Colpitts FET oscillator should do it.

http://www.diyaudio.com/forums/showt...328#post886328

http://www.diyaudio.com/forums/showt...879#post891879

[6h5c]

Originally posted by ash_dac
Hi,

Not sure you need to square up the sine...

A simple Colpitts FET oscillator should do it.

That's true ash,

When I pull the AD8561 out of it's socket and replace it by a 10n coupling cap, everything runs fine. Haven't done any A-B comparing yet though, could be worth to try. It would sure make the clock a lot cheaper .

Ray.

[ash_dac]

Originally posted by 6h5c


That's true ash,

When I pull the AD8561 out of it's socket and replace it by a 10n coupling cap, everything runs fine. Haven't done any A-B comparing yet though, could be worth to try. It would sure make the clock a lot cheaper .

Ray.

Ray,

Without the comparator...

I'm not too sure how we should power the oscillator.

Would you know how to calculate the power supply consumption of the oscillator?