On Mon, May 8, 2023 at 02:52 PM, Bob McGraw - K4TAX wrote: With the power supply of the brand and type of the original post cited, there is NO NEED for additional fuses. In fact, the addition of a fus

Do you still hear it in Test Mode? 73, Scott K9MA

I've been using the TX Monitor in the power sense mode with the K4 and KPA1500. It sometimes displays very strange CW waveforms. I have an analog scope also connected at the same point, and it shows n

QRQ is off in split mode and the other stuff is disabled because it takes too long for the synthesizers, etc. to switch. 73, Scott K9MA

Not a power supply issue. 73, Scott K9MA

My aging K3 (SN 4657) has developed intermittent output. It's not in test mode, nothing but power supply and dummy load connected, all bands, all modes. It occurs at 5 W and 30+ W, so it's not the LPA

It is indeed fortunate the Elecraft has released the schematics for the K3S, or this kind of troubleshooting would not be possible. In addition, compared to most other transceivers, the K3 is quite ea

I don't know what's still available, but some time ago I ordered spares of what I expected might wear out, mainly encoders and pots. They're all fairly generic, so even if Elecraft no longer sells the

I also just did the manual calibration. However, there doesn't appear to be a way to display the new calibration values. Even saving and restoring the configuration did not work, nor did cycling the p

The internal protection diodes are probably intended only for ESD protection, and can't handle much current. The TVS diodes, on the other hand, can handle lots of current, which is probably necessary

I hadn't run the TX gain calibration in almost 2 years on my K3. I was seeing some significant power overshoot when I changed bands, up to 126 W when set to 100 W. After the first transmission, it alw

In CW contest operation, I've never see the temperature get much above 60 C. I have, however, tested the fans at maximum speed. You will know if they ever reach that speed, and there better not be any

#kpa1500

That is true. The K3(S) will display its own output power. Unlike the KXPA100, of course, the KPA(1)500 has it's own display. 73, Scott K9MA

You would have to be a serous masochist to lug a K3 and the battery very far on your back or bike. I just use the KX2 barefoot for that sort of thing. 73, Scott K9MA

I've used both the KX2/KXPA100 and K3 for portable operation. I don't think there is much difference in power consumption, but the K3 is a lot easier to use, has a better receiver, doesn't require con

I know they're not popular, but I recommend an external tuner located at the end of the wire. The only exception might be if the coax is short and the wire is NOT a multiple of a half wave. In either

It's also probably a bad idea to try to use a power combiner with internal ATU's in the amplifiers, unless you can make absolutely sure they both use the same settings. Better to use a single tuner AF

Lack of active cooling suggests that the loss can't be large: a 1dB loss would be about 300 W. The manual definitely should specify equal cable lengths. 73, Scott K9MA ---------- Scott Ellington --- v

I would be concerned about that, too, especially with all those toroidal inductors supported only by their leads. (And Elecraft recommends against using adhesives, as it can detune them.) Since the K3

I have plenty of them, but not on the K3. Many of the cables to the desktop computer, for example. However, my antennas aren't far away, and I shunt feed the tower on 80 and 160. 73, Scott K9MA