More precisely, they are leakage from wired Ethernet systems. Wired Ethernet uses a free-running clock that is synchronized with the Ethernet Hub or Switch; we typically hear our own system and those
Remember that coupling is between those cables and the antenna you're using to RX, so what matters is proximity between the noise source and the RX antenna. If the noise is coupling into the radio wi
On many (most?) laptops with a VGA port, the connector shell goes to the chassis. BTW -- it's not a "ground" wire, it's a BONDING connection. BIG difference. See http://k9yc.com/GroundingAndAudio.pdf
I find a small lug that fits the retaining screw ,solder a short piece of wire to it, and solder the other end to a single Power Pole. This makes it easy to plug and play bonding both inside the shac
Hi Dale, If you're connecting a real loudspeaker to that radio, there is zero need for bonding it to the radio chassis. Loudspeakers are not "ground-referenced." A loudspeaker with a built-in amplifi
Nope. Wrong analysis. First, that gear with no third pin is double insulated, so there's no possibility of a short between AC and exposed metal. Such equipment is identified by electrical codes as Cl
Electrical codes (like NEC) are written by a bunch of EXCELLENT electrical engineers, and are based on solid engineering. Codes are written to take a VERY wide variety of conditions into account -- e
Yes. This is JT65 for 300-2500 Hz USB with a dial frequency of 50.276, and 2 kHz higher for JT9. MSK144 (a new WSJT mode optimized for MS) uses dial frequency 50.280 as a calling frequency, with QSOs
Here's K1JT's doc for the latest version of WSJT-X, which is operating software developed jointly by a team working with his direction. It includes both technical and non-technical details of each of
I don't see the need to change the power connector. If the cable from the power supply is split to all of the pins on the stock power connector, it's current rating is quite sufficient. I DO agree wi
RFI from SMPS is far less at VHF as compared to HF, and VHF antennas for weak signal work are generally far separated from the shack and highly directional. The reason is pretty simple -- the noise s
8 ohm phones are fairly rare. Most are in the range of 50-600 ohms. Question to the original poster -- is what you hear HUM (pure 60 Hz) or BUZZ (harmonics of 60 Hz)? Hum is most often stray magnetic
There is no such thing as a "ground loop." The "buzz" that we often blame on these mythical "ground loops" is really leakage current from the AC power line. There's a complete description of the mech
You and others making negative comments about Ten Tec must either be new to this email reflector or don't bother to read it until you have something to say. The current owner of what's left of Alpha
What I've learned by reading the mail about the ongoing saga of Ten Tec and Alpha has also been quite useful. I no longer own Ten Tec transceivers, only power amps, so the availability of parts and s
Yes. I have successfully used a pair of 80/40 fan dipoles at right angles to each other for 10 years. They are spaced roughly 12-15 inches from each other. If you have the space for a half wave on 80
Katz, I agree with your judgement. One of my two fan dipoles is currently tangled in a big madrone tree -- but it happened because one of the ropes broke after about 8 years due to wear at the pulley