Agreed on RF spectral purity. I am now testing transmit composite noise since the ARRL is only testing phase noise at this time. Sometimes the difference is minimal, and sometimes the composite noise

An update. Randy, W2KRY, is letting me keep his 101D for another two weeks, then it goes back to NY. I’ll flesh out some lab numbers, but the transceiver won’t have been run in any contests, as I have

I expect it will be next year before I will have a K4 to test, considering the hoped for first units shipped will be in November if there are no delays. Those go to hams who have paid $4000 up front,

Since the ADC in the K4 is the same as everyone else (quote Wayne), excluding Flex (my comment), I would expect the dynamic range to be about 100 dB, maybe a few dB less, with similar sample variation

Jeff, One additional comment. If a second slice using the same ADC is on a different band, then the front has to go broadband. If using a second ADC, then separate frontend filtering is still in effec

Hi Jeff, Last night I asked Warren the same question, and here is his answer. My assumption was the User Interface / LCD real estate was a major issue. Here is Warren’s answer. 73, Rob Hi Rob, As to h

Jeff. As promised, Warren has some answers for you. Hopefully this helps. We all get to learn. Rob, NC0B Hi Rob, There are many questions embedded in this discussion! I hardly know where to start. How

Hi Jeff, I don’t know that I can adequately answer your question as to programming an ADC. I am forwarding this thread to NR0V who programs all the DSP for Apache products. I would assume the speed (a

The IC-9700 may not be out of drift spec, but it has issues with some modes. Your K3 with an option can calibrate the internal clock, but it doesn’t phase lock. However at HF it likely doesn’t matter.

The issue is when the fan comes on after the rig has warmed up on 23cm. On the higher power other bands the fan comes on and the frequency moves around. Rob, NC0B

There are drift issues with the IC-9700, particularly with narrow-band digital modes. There is some drift on SSB, less on 2m, more on 70cm and a lot more on 23cm. At least at present the IC-9700 canno

From my perspective, the term SDR (software defined radio) today is virtually meaningless. A K3S is a superhet down-conversion radio with lots of DSP software programming in the tail end of the radio.

It doesn’t take much of a Google search to find the schematic you need. It looks like VR1 is what you adjust. There is also a pot in the linear RS Astron supplies. Rob, NC0B

If someone wants TS-890S numbers I have some on my website and more available on my long form report. Rob, NC0B rob@...

I would like to see the latest spec on the FTdx-101D. Rob, NC0B

This is true, as is the very high blocking value for the TS-890S. If I was at a typical Field Day event, without extremely good antenna isolation (Search on W3AO & info from W3LPL), I would consider t

Hi Bob, I would count the order differently if numbering is of interest. The radio at #1 cannot be reproduced with current software. #2 is a receiver, but the second sample of the same model is lower.

Hi Dale, I don’t know, but I doubt the type of transistor is significant. The really close-in noise is affected by the cooling fans, an issue that N0QO and I found a year ago. Elecraft supposedly fixe

Field Day is the most likely place we run into both transmitted composite noise and serious RMDR limitations. Multi-transmitter contesters, too, but they already know that is a big problem. Rob, NC0B

Hi Fred, You are not hurting the amp or the K3, but you are making the transmitted noise much worse. Here is an example. I use an IC-7300 on 630 meters with a transverter that only requires 5 watts of