[DSP-10] Source of HP10811

Wed, 27 Mar 2002 08:07:44 +0100 (CET)

Hi Pieter,

please take a look at the below site of Richard
about the use of DDS instead of DAC in reference
oscillator : 

http://www.karlquist.com/

73
Rocco

 --- Pieter <[email protected]> ha
scritto: > Hi,
> 
> Does anyone know where I can find an HP10811 10 MHz
> oscillator cheap? I have
> seen a couple inside HP counters on ebay but I would
> like to just get the
> source. As a work around of not having the HP10811,
> I was thinking of the
> following:
> 
> Take a really good OCXO that is not tunable and feed
> it into an Analog
> Devices AD9854 DDS chip. Use the times (x5)
> multiplier so that the reference
> is 50 MHz inside the chip. This chip has a 48bit
> frequency register so the
> output frequency could be set in steps of
> .00000017763568394002504646778106689453 Hz at ANY
> output frequency between 0
> and ~20 MHz. I have a couple of these chips already
> on boards so I would not
> have to solder the 80 pin chip :). The phase
> detector would be very similar
> to the Shera board, but would not require a DAC to
> drive it since the serial
> data would set the DDS instead. Also, I could come
> up with the tuning words
> that limit the tuning range to 16 Hz around any
> desired frequency and not
> have to manually tune the OCXO. Also the OCXO would
> not have to be exactly
> at 10 MHz. Any ideas?
> 
> Pieter Ibelings
> N4IP
> 
> 
> 
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