Yes. Remember that ham radio is a small world, and the service of ham gear is a very small business. I don't know anything about the company or person involved or how good or bad their service is. Bu
You have good reason to be confused. Do two things. 1) Go to the source -- www.fair-rite.com and download their catalog. They actually make the parts that Amidon sells. 2) Go to my website and downlo
The distortion and losses will depend on many variables, including the power level, the size of the core, and the number of turns. What were your test conditions (core size, turns, etc.)? Jim Brown K
Something that appears to have been missed in this discussion of T/R switching, especially where QSK is involved, is that both transceivers and amps have delay circuits involved that prevent the rig
I'll second the recommendation for both books. Jim Brown K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Our EE class (from the University of Cincinnati) was lucky enough to tour the site during our senior year (the winter of '63-'64). We had just finished our course in Transmission Lines a few months e
I strongly recommend the FREEware called PSK31, which is part of the FREEware Ham Radio Deluxe suite of programs for radio control, logging, and mapping. Works really well, absolutely painless to use
EXACTLY! While I don't know enough about the SB220 to know whether you're right about that particular amp, I strongly agree that one of the most important components of good engineering is spending m
Safety codes in most countries, as well as good engineering practice, REQUIRE that the chassis of all equipment connected to mains power be bonded to "safety ground" or "safety earth" -- that is, the
doing is not only unsafe, it is also illegal. The bond between neutral and earth in the UK is made within the mains system, not at your premises. Further, it is quite important from a safety point of
In the UK (and the rest of Europe), mains power is 240 volts, with one of the conductors being a neutral (what North America electrical codes call "the grounded conductor"). In other words, it is jus
A 4-wire 240V circuit requires a 4-contact appliance connector of some sort, not a conventional 3-contact 240V outlet, because the conventional 240V outlet bonds the third pin (the round pin) to the
The third wire in a properly wired North American 240 volt outlet is NOT neutral, it is equipment ground (that is, safety ground), and the outlet bonds it to the backbox. Jim Brown K9YC _____________
1) I have no idea how your Honda generator is wired, whether it has protection devices (breakers or fuses), or how you intend to use it. 2) The tutorial I prepared several years ago on power and grou
Interesting. To have an intelligent discussion of this, I think we need to understand that switchers can be made with any range of performance spec for RFI from very good to awful. Because I don't ha
Which "Journal of the IEEE" are we talking about? IEEE Spectrum is NOT peer reviewed, and there have been some significant complaints about stuff with questionable science published in it. Jim Brown
Indeed there are! I didn't mean to be parochial, only saw the post as a typo for IEEE. I serve on the AES Standards Committee with some excellent engineers from around the world, including Germany, S
Perhaps you're thinking dBuV? dBu is a measure of voltage referenced to 0.775v, and is widely used in pro audio, where output stages are low impedance (typically 50-100 ohms) and intended to drive hi
"There are many reference levels tied to dB expressions of voltage and power, and all of them have their place as long as you understand what you are measuring or specifying." The field strength refe
I use a pair of RS-70's with mine. Using only one would require a new connector rig, which I don't have the parts to build. But based on current draw and power supply ratings, I wouldn't do it unless