Dr Bruce Griffiths <[EMAIL PROTECTED]> wrote:
> The 100K+100pF in series with the comparator input must really help in
> elevating the noise level.
Jeeze. These AD comparators are used by me in line receivers where
they are usefully terminated at 100 ohms! And here they are putting
100K in front!
half Of Richard H McCorkle
>> Sent: Sunday, October 29, 2006 10:33 PM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Allan Deviation -> continuing saga...
>>
>>
>> I had been using the Shera HC4046 input circuit for my 1
half Of Richard H McCorkle
>> Sent: Sunday, October 29, 2006 10:33 PM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Allan Deviation -> continuing saga...
>>
>>
>> I had been using the Shera HC4046 input circuit for my 1
of precise time and frequency measurement
> Subject: Re: [time-nuts] Allan Deviation -> continuing saga...
>
>
> I had been using the Shera HC4046 input circuit for my 10811
> GPSDO input until I read the test results in the LPRO manual
> http://www.symmetricom.com/media/pdf/manu
se time and frequency measurement"
Sent: Saturday, October 28, 2006 4:21 AM
Subject: Re: [time-nuts] Allan Deviation -> continuing saga...
> John Ackermann N8UR wrote:
> > To minimize jitter and tempco, you probably ought to stay away from a
> > comparator if you can. I've
From: Dr Bruce Griffiths <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Allan Deviation -> continuing saga...
Date: Sun, 29 Oct 2006 10:35:44 +1300
Message-ID: <[EMAIL PROTECTED]>
Good Morning Bruce!
> Comparators are fine with a good layout.
As you sharpen up the rise-times, l
Didier Juges wrote:
> Magnus Danielson wrote:
>
>> Look at the AD8561 datasheet first. The 74HC4046 is much slower than the
>> AD8561 and the higher output slewrate of the AD8561 is certainly good to keep
>> jitter down. The 74HC4046 is worse for that aspect.
>>
>> What I would rather critize Di
From: Didier Juges <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Allan Deviation -> continuing saga...
Date: Sat, 28 Oct 2006 08:44:27 -0500
Message-ID: <[EMAIL PROTECTED]>
> Magnus Danielson wrote:
> > Look at the AD8561 datasheet first. The 74HC4046 is much slower tha
Magnus Danielson wrote:
> Look at the AD8561 datasheet first. The 74HC4046 is much slower than the
> AD8561 and the higher output slewrate of the AD8561 is certainly good to keep
> jitter down. The 74HC4046 is worse for that aspect.
>
> What I would rather critize Didiers schematic for is the lack
From: John Ackermann N8UR <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] Allan Deviation -> continuing saga...
Date: Sat, 28 Oct 2006 08:36:43 -0400
Message-ID: <[EMAIL PROTECTED]>
> Didier Juges said the following on 10/28/2006 12:18 AM:
>
> > The clock shaper us
John Ackermann N8UR wrote:
> To minimize jitter and tempco, you probably ought to stay away from a
> comparator if you can. I've had good success using the input circuit
> from Brooks Shera's GPSDO which is a 74HC4046 PLL, but using only the
> input circuit and not the PLL section itself. Alterna
John Ackermann N8UR <[EMAIL PROTECTED]> wrote:
> Didier Juges said the following on 10/28/2006 12:18 AM:
>
> > The clock shaper uses a commercial 10.7 MHz IF transformer, readjusted
> > down to 10 MHz (see schematic at
> > http://www.ko4bb.com/ham_radio/Manuals/2_GPS_Stuff/Clock_Shaper.jpg).
> >
Didier Juges said the following on 10/28/2006 12:18 AM:
> The clock shaper uses a commercial 10.7 MHz IF transformer, readjusted
> down to 10 MHz (see schematic at
> http://www.ko4bb.com/ham_radio/Manuals/2_GPS_Stuff/Clock_Shaper.jpg).
> It provides light loading to the OCXO through the 390 ohm
In the quest to check the stability of my OCXOs and make a GPS
disciplined oscillator, here is my current progress:
Using parts I had on hand and a couple of free AD8561 samples, I made a
synchronous divider for the 10 MHz OCXO to get it closer to 1 Hz. Since
I only had two synchronous binary d
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