DDS frequency switching speed is limited by the control logic, probably
would take a whole cycle at RF just because of the number of bits in the
serial control word. There's no chirp, the danger is a click from the
abrupt change of slope on the developed waveform.
73, Jerry, K0CQ
On 3/21/2011 12:37 PM, firstname.lastname@example.org wrote:
> At 10:58 AM 3/21/2011, Steve Hunt wrote:
>> I replaced the PTO on one of my two Corsair IIs with the
>> N4YG DDS board. That provides two VFO functionality and Split operation;
>> it has transformed the tuning "feel". That Corsair is now the first I
>> switch on when I go into the shack, in preference to my other Corsair or
>> the Omni VI.
> Do you use split operation on CW? Curious to know if the DDS osc can handle
> the instantaneous shift of frequencies at a fast keying rate. Obviously there
> is a delay compared to the External VFO that runs constantly, but is the
> shift noticeable either in a chirp, click or an "enabling delay" that shortens
> the dots?
> 73,& TIA
> Perry w8au
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