The k4 group has definitely not been closed. I’m guessing this was supposed to go there. Wayne N6KR ---- elecraft.com

As Eric alluded to, the entire Elecraft design team is safely working from home. We're busy adding new capabilities to the K4 and testing it in real-world conditions. (If it weren't for the lock-down,

Yes. Wayne N6KR ---- elecraft.com

The latter. ---- elecraft.com

Here’s one way. You can send a string, say a letter ‘T’ (etc.) in CW mode with tone output only by embedding “<“ (RF off) and “>” (RF on) characters in a KYtext command. For example: KYW<T>; The ‘W’ f

Rob, What are you using as the stimulus for these tests? We'd like to reproduce this in our lab. Wayne N6KR

Still doing measurements, but it will be nominally similar to the K3, and better when optimized for minimum QSK delay. (In the K4, there’s no need to switch a synthesizer between transmit and receive

Yes. But if the signal is still too hot, it triggers the COR. Wayne

All RX antenna ports have series PIN diodes that open during TX. Wayne

I believe the excess fan noise problem was eliminated with a capacitor across the fan drive lines. There’s a mod kit for the K3. It should already be present in the K3S. There is of course a pedestal

All RX IN ports are disconnected by PIN diode switches during transmit. They are also protected by carrier-operated relays. If the COR relay gets keyed by your RF or by another nearby TX, consider inc

There was just enough space on the 4-band module for miniature, low-TC trimmers. Piston trimmers wouldn't fit. Wayne

Got it :) Wayne

We will always be able to repair your ATU, Marsh. In general, we can get parts for all of our products for repair purposes even if they're no longer offered for sale new. The one exception to that in

I'll look into this ASAP, Dale. Wayne N6KR

Greetings all, The K4 is the replacement for the K3S + P3. This is a long-planned transition, and we've gradually drawn down stocks of the latter, including all options. I'm sorry we can't provide opt

Chuck, I have a lab spare that's fully functional that I'll send you. What's your address? Wayne N6KR

With a K4D, the two receivers can use separate antenna inputs. With a dual-RX-output transverter, you could connect one of its RX outputs to XVTR IF IN, and the other to RX ANT 1 IN. You would then pu

On average, IMD will be much better at 35 W than at 100 W. And as with all class AB amps using MOSFETs, the IMD will vary per-band. Wayne N6KR

Rob, K3s are tested for -30 dBc or better 3rd-order IMD at 13.8 V at 100 W (ARRL method, 6 dB higher than your table). Average across all bands is typically -35 dBc. The one you measured may not be co