I'm a little puzzled by that. Most of the IM we hear is from transmitters, not generated in receivers. The typical SSB transmitter IM3 is in the -25 to-30dB (below one tone of two equal tones). A ty
Jim and others, I'd propose an alternate idea. I'd look into placing a good quality inductor across the antenna terminals. That might cancel the reactance while raising the impedance. The inductor wo
Jim and others, I'd propose an alternate idea. I'd look into placing a good quality inductor across the antenna terminals. That might cancel the reactance while raising the impedance. The inductor wo
It's unfortunate that we have decided the lack of useful data somehow means all data is useless, and that many have concluded measurements are meaningless. Part of this is because some parameters ar
The important thing to remember is ARRL testing is getting better, and they are willing to improve it even more IF we can give them reasons for changes. Even a year ago, they measured and published
One problem with comparing things is many of the effects are subjective, like "fatigue". One person might be bothered by something that won't bother another person at all. The other major problem is
Yes, but they have almost entirely new circuitry, from mixers to audio. Stock they need a whole lot of work, they really aren't as good as many other newer receivers. Rebuilt with solid-state compon
While I am not a "fan" of needless mixers, I think we might be encouraging mixerism. For example, all of the annoying hiss in FT1000's comes from a single IF amplifier stage just after the last narr
Not only that, the transmitted signal is much cleaner with triodes despite all the tube marketing hoopla about how good "modern tetrodes" are. 3CX1200's have about the longest service life of any tu
Speaking as someone who designs products, complaints are the single most important mechanism in learning what people actually desire and finding actual design problems. Without complaints about pane
A BNC male will plug into a 50 ohm N female with a good fit, if you remove the bayonet from the BNC. The 50 ohm N will plug into a BNC female with no changes. All of the internal dimensions are very
Most important, keep in mind that is the ARRL's dB below PEP measurement that makes everything look 6dB better than the standard method. On the negative side, Texas Star CB amplifiers (with class C
The final amplifier is a very small part of the system. In my IC- 751A's, most of the distortion comes from the driver transistors. In my FT1000D, most of the transmitter composite noise and a notic
The real problem is we don't have a consumer reports to look at! We only have QST, and they sure aren't nearly as thorough. The automotive equivalent of the modern rig problems we are discussing are
I added bypass to the 784 DSP for transmit so you don't have to filter the sidetone, but of course you don't have to use the bypass feature on the amplifier/radio keying line. It is a real DSP syste
The ARRL lab is actually almost too immune to external feedback of any type. People aren't correct in saying they bend to manufacturer's will, so far as test results go. While I don't think the meth
Antennas radiation is directly tied to ampere-feet of linear distance, nothing else. EM radiation occurs because of charge acceleration, nothing else. 200 feet of wire in a ten-foot physical length
The only time a line does not radiate is when the line carries exactly equal and exactly out-of-phase currents. That also assumes conductor spacing is infinitely small, or the line is twisted at dis