That's a fatal flaw for anyone doing automatic switching for antennas or bandpass filters. No big deal for a small station that doesn't need that. It's important to realize what markets a given radio
No bluffs. Product reviews that can be downloaded from the ARRL website. May 2011 QST page 47, Fig 1 for the TS-590S Jan 2009 QST page nr doesn't show Fig 3 of the K3 review. Aug 2011 QST page 45 Fig
In between slow periods in IOTA today, (and there are a LOT when you're on the west coast) I did this. Here's the graph. The closer the curve is to the bottom of the graph, the cleaner the radio. k9y
The published ARRL data currently goes out 1 MHz from the carrier. I arbitrarily chose to quit at 10 kHz, but it wouldn't take much to add some data points, logarithmically spaced. 73, Jim K9YC
You would care a lot if you tried to operate next to someone running legal limit 5-10 kHz away from you. When I contest on 20M, I'm continually being yelled at by guys on so-called "nets" that are re
"THEY HAVE NEARLY THE SAME COMPOSITE NOISE." Several points. Mr. Allison is probably not a contester. He is looking as a lab tech, not as a user. Second, they way the data are plotted with all the da
On 7/27/2014 12:26 PM, Billy Cox wrote: We all makes mistakes, you made one this weekend with your post on the E brand forum as to saying that someone needed to be fired over a schematic? True? My pr
The title says it all -- Rick asked for it, and I did it this morning, changing the frequency axis to log and moving labels around. I also added data for the new IC7100, a do everything cheapie with
Good question, Kim. Part of the answer is the RX bandwidth. Another part is the receiver's issues. In the meantime, here's more to chew on. It includes replots of ARRL's Keying spectra, and some word
As any comparative study of ARRL Lab tests will show (what I've done so far was less than 16 hours of my time), specifications of modern radio gear are almost completely meaningless. A manufacturer's
My neighbor has one in his pickup. I tried using it and found that I had to go to menus to do simple things that were operational. I also had an FT100D. Same problem. To me, menus are fine if you onl
Off list. I've been thinking about this. First, I think it's non-correlated noise, so the wideband noise would add by 10 log BW, where BW is the RX bandwidth that would need a correction factor for f
Not quite. Bandpass filters can only kill out of band noise -- that is, a 20M bandpass filter passes ALL 20M signals, regardless of where they come from, but will effectively prevent its own noise fr
Well, I meant to send it off list, but it was late. :) I've been thinking about this. Overnight, I thought some more. The keying waveform is, fundamentally, modulation of a continuous carrier by a wa
Yup. What if we modulated the TX with pink noise? That really does have everything in it. Make the pink noise much wider than the expected audio bandwidth. Ideally, the spectrum should be limited to
Several guys asked about why no SDRs were included, not realizing that the K3 and KX3 are SDRs with knobs. To address their interest, I've added the other three SDR transceivers that ARRL has tested
Why? Because it's more expensive and more highly advertised? A major reason I took the time to put that ARRL data in a more useful form was so that a potential buyer can make a more informed decision