You sure you're actually blocked? I had a hell of a time logging in the other day.. tried numerous times trying to log in, and even changed my password three times, still couldn't get in. Eventually succeeded, but I was beginning to think I just wasn't wanted.
There's something that's become screwy about that sites mechanical structure, not only has it become rather slow to browse, but there seems to be a lot of things out of whack with it's underlying software.. Don't misunderstand me, I'm not knocking the site itself, I only mean they need to get thing corrected.
Anyway, all that aside.. Glad to see you here. Boomer seems to be well versed on carrier current and should be able to offer some good advice.
Part15 had hacking problems earlier, so maybe there are safeguards in place that are sometimes tripping up the browser.
I've been doing my carrier current station now for about 4.5 years, trying lots of different things, so I might have something to bring to the table. I think there are a few others here who do carrier current, I know current admin Dr. Bob had been doing it.
I was able to put together a station for a few hundred dollars, after tuning and upgrading the well-used LPB transmitter, and getting it on to my frequency.
For now I can't write or look up as much, getting ready for New Years, which includes radio.
I have a Radio Systems Phase II 20 watt transmitter and LPB TCU-30 coupler for my carrier current operation. Seems we have mating mixed equipment.
My setup uses neutral injection. The hot side connects to the AC neutral and the cold side to an isolated ground rod. I put the ground rod about 25 feet away from the service ground to give some impedance between them. I ran a separate wire to the breaker panel to make the neutral connection. The neutral and service ground are bonded at the panel.
I was running about 5 watts and could hear the station a couple miles out. Once I got a quarter mile from the station, the signal would drop down and stay fairly constant from there on out.
Of course, where there were rear lot line power lines the signal would disappear as I was more than 100 feet from the lines. Other places with underground wiring were hit or miss. Might disappear or be stronger than usual.
I recently shut it down. Seemed to be interfering with our DSL service. So, I'll fire it back up soon and see what happens.
Many complain about AC hum on their carrier current signal. I notice that when very close, like in my house. But once I'm away from the house the hum is gone.
I also tried the conventional connection between the AC hot and neutral. The range was very limited since the signal will not pass through the pole transformer. Also, I blew out a wall wart switching power supply. The CC connection was simply plugged into a wall outlet which was probably on the same circuit. Seems it didn't like all that RF...
MRAM 1500 Charter Member ALPB Previous Chairman ALPB
Awesome - As soon as the transmitter arrives, ill look into adding the additional wiring. I may put the carrier current system in the back office of a business; which will ensure I don't screw up my house system
What would be cool since the ASPISYS ASMAX2 is 50 ohm and mine has a BNC connector connected to an adaptor for a female PL259 would be to come up with an amp/coupler for neutral injection this way I could try that in my town and see what type of signal. If done right I probably could transmit FULL Quieting (or close) for about 2 miles. What listeners I'd get then.
How's it going MLR, hope your system is getting together.
The coupler is something that's important in carrier current, it's really like an antenna tuner, but built with special properties to tune into a power line, and deliver the maximum signal that it can into it.
In a way the coupler is akin to the loading coil in an short antenna transmitter, in that it presents a 50 load on the transmitter side, and something different on the other side.
Usually a power line has a large inductance, which the coupler tries to correct with a series capacitance, which is what the capacitance bank in the coupler is for.
The other characteristic of a power line is it usually has a low impedance, often much less than 50 ohms, like my coupler has been set as low as 1 ohm, and currently it's using a 12 ohm setting I believe, and that's what your inductance selector is for, matching the power line's impedance.
When you get the right combination of impedance and series capacitance, the SWR should have a low reading, as close to 1:1 as you can get it. I recommend turning the transmitter power down to a few watts until you have it tuned correctly.
There's lots more you can learn and experiment with, such as separate isolated grounds, neutral loading, all things that can come into play depending on your situation.
Every carrier current install tunes differently from any other and needs a unique setup, even changing feed outlets, or if you move to another house, expect settings to be all different.
Somewhere in another thread I mentioned building my first carrier current coupler, and I ran across a picture of it, built on a wood base with terminals and a ferrite core from some old stereo.
It did work, at the higher end of the band, probably not as well as it could have, since the output inductance (white wire link) isn't adjustable, but it did get out locally and the transmitter was happy, so I thought it was a success.
For the series capacitor I soldered test capacitors on the input. The idea for the design probably came from Ernie Wilson's Carrier Current Techniques book. Since my edition of that book is from 1990, and I built this in the early to mid-90s. I just used parts that I had then.