[Elecraft] New DSP Idea

[Wes Stewart]

Lyle is retired here in Tucson.

Wes  N7WS

On 1/14/2019 3:00 AM, Bill W4ZV wrote:
> David Gilbert wrote
>> Yes, I agree that the computation needs to be done in the frequency
>> domain with an FFT.  I have no clue whether or not the K3 and K3s have
>> enough computational power to do so, but Lyle (Elecraft's DSP guru)
>> briefly discussed this idea with me when I suggested it several years
>> ago and he seemed to think it might be feasible.  At the time the K3
>> synths wouldn't preserve lock when you changed frequency so it wouldn't
>> have been very practical back then, but the new synths are fed by the
>> same oscillator now.
> You asked a good question Dave.  I recall Lyle telling me the same years ago
> (where is Lyle anyway...buried in K4 firmware?).  I've used the NCC-1,
> MFJ-1025 and ANC-4 over the years to phase parallel staggered Beverages.
> This is probably beyond the processor in the K3 but it remains a good idea
> to investigate for the K4.  The downside to phasing two identical antennas
> internally is that you must give up diversity.  Using the NCC-1 output for
> one input to the K3 diversity and a different antenna for the other allows
> both simultaneously (but for two different purposes).
>
> I'm afraid the market for users who want to do this sort of thing may be
> small, but clearly there is a decent market for noise canceling devices.
> BTW noise canceling boxes ONLY work well for canceling a single local noise
> source which requires a nearby sense antenna for one input (groundwave only
> since propagation introduces constantly shifting relative phase changes).
>
> 73,  Bill  W4ZV
>
> P.S.  The bottom 2 plots in the link below show what can be done by phasing
> two parallel staggered Beverages:
> http://users.vnet.net/btippett/new_page_10.htm