I think K4D is a direct sampling SDR, no such thing as a discrete filter in
sight, Crystal or otherwise.
K4HD module will revert a K4D back to an old fashioned superheat front end with
a fixed first IF so you can fit filters but I don’t know if any outside
Elecraft knows what the centre frequency will be.
Probably only worth it if you’re a multi multi station or have 1500 watt
neighbours half a mile away.
Martin
Hs0zed
Sent from my iPhone
> On 1 Dec 2023, at 18:47, Pete Smith N4ZR wrote:
>
> I am about to buy a K4D. I have 500-Hz filters (probably INRAD) in both my
> K-3's receivers. Will these filters fit in the K4D? If not, who currently
> sells such filters for the K4D?
>
> --
> 73, Pete N4ZR
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