In the world of pro audio, where I made my living as a consultant for 30 years before retiring several years ago, we had to go back and study the fundamentals of circuit theory that says that any var
Not true! RELATIVE phase differences are QUITE audible, and they made that K2 RX pretty awful to listen to. We may not IDENTIFY a particular nastiness of sound quality to non-uniform phase response,
As we get older, we develop limitations we didn't have when we were younger. Some of us can't see as well as we used to, some can't hear very well, and a good friend and very smart EE has hand tremor
They are operating at VERY widely separated frequencies, AND their circuit board layouts must be carefully done to avoid both radiation and reception. I would bet that most modern products use multi-
Yes. I don't know anything about powdered iron materials, but all ferrites get increasingly lossy with increasing frequency. A few ferrite mixes are designed to handle high power, and are pretty low
The relatively new Elecraft KPA500, specified at 500W ICAS, doesn't go out the door unless it makes 600W on 160M-6M, and it's happy running 600W into a matched load with keydown modes. I run it that
Naw, it's a plus for conservative design. One thing that seems to be missed in this discussion about home brewing amps was clearly pointed in a comment in this thread -- the key to solid state amp de
You "know" WRONG! This is one of those often repeated myths with little basis in fact. A properly done coax connection is essentially lossless at HF. Loss in a switch depends on the quality of the sw
Correction -- JUNK connectors can get hot with 1,5kW. Example are the JUNK elbows and Tees that use a tiny spring as the center conductor. I've also had the JUNK Tees fall apart. 73, Jim K9YC _______
Yes. Several years ago, a VE1 (RGB, I think) sent me a copy of measurements he had done on a bunch of PL259s and barrels in a string. His data showed VERY low insertion loss to fairly high frequencie
Mike got it right the first time. The length of a PL259 and mating connector is quite small as a fraction of a wavelength below 500 MHz. The so-called mis-match losses are pretty much fictional, and
That's 1-2 GHz. I don't think anyone would debate that. I don't think anyone would debate that cheap connectors are problematic. I've had no end of problems with them. I suggest that you try measurin
I sold them for fifty cents each at hamfests. Jim _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Yeah, they're almost as gullible as hams, who spend upwards of $200 on Heil mics with $1 capsules in them, magic 43 ft verticals, Windom antennas, G5RV "all band" antennas, so-called baluns in enclos
Both. See the family of curves in the ARRL Handbook for excess attenuation due to mismatch, which has been in every edition of the handbook since I've been buying it (the 50s), and which I've confirm
1) None of this has any relevance without considering the actual complex source impedances and load impedances at each connector. Those impedances are likely to have far greater effect than the small
No, it is YOU who changed the topic. I began this discussion by noting that proper UHF connectors are just fine at HF and low to mid-VHF, and you proceeded to go to your modeling software to find a w
I just found this very nice Java application written by Ward, AE6TY. He calls it SimSmith. You'll need Java loaded on your computer to run it. http://www.ae6ty.com/Smith_Charts.html I've had some ema
The good news is that there's nothing on that bias board (except, perhaps, a relay) that isn't generic discrete transistors and diodes, and all can easily be checked with a good VOM. I've done it, an
Sure. One is one one leg of 240V, the second on the other leg, and there is no connection on the primary side to ground or neutral. Yes, a capacitor or the transformer could short, and would likely b