[Lowfer] Can a DDS replace the crystal in an oscillator ??

[John Andrews]

Andy,

Be more specific about what you think is causing the drift. If it's an 
oscillator in the 10 meter rig, that's one discussion, as there are a 
number of oscillators involved. If it's the crystal in the 
downconverter, that's another.

A DDS performs no magic as far as stability goes -- it will only be as 
good as its clock oscillator. Depending on what you are doing with the 
DDS, you <<may>> get the advantage of division to a lower frequency. 
I've got a bunch of AD9851 DDS chips running in various rigs, but the 
magic comes from clocking them with proportional oven-controlled or 
GPS-locked signal sources.

John, W1TAG

On 4/30/2010 12:59 PM, Andy - KU4XR wrote:
> I don't know, so I ask. The HTX-100 10 meter rig drifts unacceptably
> to use it for slow mode work. Can I replace the aging crystal in the
> oscillator circuit with a DDS unit to obtain better frequency stability ??
> An un-noticable drift at 28 MHz, when converted down to LF becomes
> excessively noticable, and makes many modes un-usable.
> Using the 10 meter rig to drive the homebrew HF to LF Transverter.
> It works well, but the radio drift hurts. So a $50.00 DDS unit will be
> a lot cheaper than buying another late model radio to use with the
> Transverter.
>
> Thank you, and 73 :::
>
>
>
> Andy - KU4XR - EM75xr - Friendsville, TN. USA
> LOWfer Beacon " XR " @ 185.29875 KHz ( QRSS-60 )
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