DDS-VFO Maybe off Topic

 
  I've been researching the DDS VFO topic on the Internet and found that somethings have been done in this area in the USA, but most of the sites are found in Japan or Europe.  Why has the DDS-VFO type of circuit caught on here?  I am looking for a kit or a project I could build for some Xtal control rigs I have rather than buy Xtals.  Seems to me that would a nice way to go.  I know that Flex Radio has done quite a bit of work with DDS and so has Elecraft.  I wonder if there is a market out there for DDS VFO technology and a crystal replacement....
   
  Lee - K0WA
   


In our day and age it seems that Common Sense is in short supply.  If you don't have any Common Sense - get some and use it.  If you can't find any common sense, ask for help from somebody who has some common sense.
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[N8LP]

Check out amqrp, njqrp, norcal and KD1JV's websites. Keep in mind that
receiver performance will probably suffer with a DDS VFO though,
compared with a good PTO.

KD1JV had a really neat 4-band rig called ATS-3, but he may be sold out
on the current run. Most of these are project kits, and are done in runs
of 100 or so. Once sold out, you have to wait for the next run, or find
an unbuilt kit.

All the DDS kits are heavily SMD, so they are not Elecrafts when it
comes to assembly.

Larry N8LP



Lee Buller wrote:

>
>  I've been researching the DDS VFO topic on the Internet and found that somethings have been done in this area in the USA, but most of the sites are found in Japan or Europe.  Why has the DDS-VFO type of circuit caught on here?  I am looking for a kit or a project I could build for some Xtal control rigs I have rather than buy Xtals.  Seems to me that would a nice way to go.  I know that Flex Radio has done quite a bit of work with DDS and so has Elecraft.  I wonder if there is a market out there for DDS VFO technology and a crystal replacement....
>  
>  Lee - K0WA
>  
>
>
>In our day and age it seems that Common Sense is in short supply.  If you don't have any Common Sense - get some and use it.  If you can't find any common sense, ask for help from somebody who has some common sense.
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>
>
>
>  
>

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[John, KI6WX]

Lee;
A DDS VFO does have some issues when used to directly drive a transmitter.
The biggest one is spurious outputs.  These may be only 70 dB down from the
carrier and a few kHz to 100's of kHz away.  Now when you are running low
power, such as the KX1, this doesn't matter too much.  But if you directly
run a kW from a DDS VFO, you may make some other folks not too happy with
your spurious outputs.

-John
 KI6WX

>
>  I've been researching the DDS VFO topic on the Internet and found that
> somethings have been done in this area in the USA, but most of the sites
> are found in Japan or Europe.  Why has the DDS-VFO type of circuit caught
> on here?  I am looking for a kit or a project I could build for some Xtal
> control rigs I have rather than buy Xtals.  Seems to me that would a nice
> way to go.  I know that Flex Radio has done quite a bit of work with DDS
> and so has Elecraft.  I wonder if there is a market out there for DDS VFO
> technology and a crystal replacement....
>
>  Lee - K0WA

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