The Ten-Tec Orion was the first to go back to a relative low first IF with roofing filters, followed by DSP I think in 2004. Then in 2008 the K3 overwhelmed the Orion II. Rob, NC0B

Remember that the crystal filters are roofing filters, and you can operate CW even if you only have the standard 2.7 kHz filter. Set the DSP for any bandwidth you want. Of course in a pile-up a 400 or

The headphone amp is separate from the speaker amp. Rob, NC0B

It is easy to buy a previously owned K3 or K3S, and significantly cheaper than a new one. I wouldn’t say a new K3S was all that “mid-priced” in April 2019. One of my friends in Colorado purchased a us

I was rather surprised that Elecraft emphasized a discount on the K2 through the end of the month. https://elecraft.com/products/february-2020-specials How much demand is there for a new K2 kit? Of co

Hi Dave, Ok, thanks for your quick reply and the spreadsheet link. Rob, NC0B

I would like to know the 1 dB compression point of both Elecraft amps, and others too, for that matter. Here is the general issue that I first ran into in respect to the Beko 2 meter amp. It was a Fle

That would normally be an adjustment to deal with an amp’s T/R switching time to prevent hot keying. I set my TX delay to 15ms for my Acom and Alpha QSK amps. The Alpha 89 has PIN diode T/R switching,

Typo. I meant I need to add the TS-890S, and the K3 for that matter. Rob, NC0B

Hi Wayne, I use the same pulse generator that I use to test how a receiver's AGC handles impulse noise. The K3 is one of the few rigs where the AGC doesn't get captured by an impulse, like an electric

It takes about 5 minutes to make the measurement. Four minutes to hook up the equipment and 1 minute to measure it on a digital scope. I have data on 12 rigs at nc0b.com/latency Download the PDF. I ne

That will be interesting with current rigs running from 10ms to 180ms. Rob, NC0B

Yes the K3 is cleanest around 35 watts. No I never tested it at 30 watts vs. 35 watts, etc. I doubt you could tell the difference. Rob, NC0B

#kpa1500

My IC-781 cooling kit used 470uF from the fan B+ to ground. I haven’t seen the Elecraft schematic. Rob, NC0B

I don’t know, but a 16 volt electrolytic would meet the Elecraft voltage spec. A 25 volt cap wouldn’t be that much larger, but I don’t know the mechanicals involved. I didn’t find any temperature data

A DC fan, brushless or not, creates noise that gets back into the radio. For decades I sold a cooling kit for the Icom IC-781, and I had a small dropping resistor (since the available supply voltage w

Your neighbor or Field Day! For the price of a 470 uF capacitor, why not do it? Rob, NC0B

Savings at Costco on eye glasses are similarly significant. A new prescription from Kaiser, with an insignificant co-pay, if filled at the same Kaiser facility, would have been $498.00. My third time

I added an FET buffer amp and an emitter follower to the R-4C since there was no IF output. Does the FTdx-5000 have an 9 MHz output on the rear panel? Rob, NC0B

I setup a P3 to work with an R-4C. The IF of 5645 kHz was already preprogrammed into the P3. It works with a lot of IF frequencies, not just the K3 IF. Rob, NC0B