Stuff At "W 60 HZ" : Equipment crashes, CC line Z changes, Audio Recorders, Etc.

MICRO1700 · 2012-11-04T13:37:29Z

All in the days work for a Part 15 operation. Hi Guys! One of my audio processors decided not to process audio anymore. Now it boils eggs, but I'm not hungry. All in the days work for a Part 15 operation. Hi Guys! One of my audio processors decided not to process audio anymore. Now it boils eggs, but I'm not hungry. My DBX 160X processor (from an old radio station equipment pile) looks great and all of the wonderful LED bargraphs are all pretty with bright LED orange and red. Nothing is coming out the back output jacks, though. Oh well. I've got other processors on the big pile. This had been a really good processor for AM transmitters. It's mono. Well, actually... now it's not anything. So be it. The MPX-96 workhorse FM transmitter got unstable and is putting out weird stuff. I noticed it right away. In my opinion, that's why it's important to comply with Part 15.239 - at least in this particular case. The MPX-96 only sent RF around the house, so nobody got interfered with. I believe I know what's wrong. There is an important coil in there that might need adjusting. Still, this workhorse will only be "horsing around" around the property, if I can fix it. We'll leave the attempts at a little more signal coverage to the certified FM transmitters. The C Crane is lent out to a friend. That just leaves the $11 Maxell P-13. It's chugging away on 88.3 this morning. Mot going too far, either, but I sure like the thing, for what it is. Too bad it only operates on 88.1, 88.3, 88.5, and 88.7. "Crazy ideas dept" I was thinking of combining the output of the Maxell P-13 with another oscillator to mix up to another part of the FM band. Yeah, that will be the day. Still, it's cool for a science experiment. I'll probably never do it. Weird AC line impedance changes here at "W 60 HZ." I don't have any equipment to measure this. I can just tell from observing everything involved with this experiment. RFB was and is right about his CC stuff. A friend of mine who knows a guy who knows another guy has located another stash of AM BCB crystals. I might be changing channels from 1020 kHz (for the CC operation) to something lower on the band. I also might get a crystal and grind it to get onto 620 kHz, my channel of choice. These are all long term projects, but they are part of the fun. Work on the CC coupler continues. I'm going to build a wide range tunable coupler someday. I'm learning more and more about how to do it. Odd audio recorder discovery: I went out and brought an audio recorder - like a micro cassette recorder - except that it's completely solid state. This thing is a Sony - um - I'll have to get the model number later. This teeny and very elegant little device works great for my job, where I make notes of what I'm doing - so I don't have to write them down. Then I realized how great the fidelity is on this little unit. Then I saw it was sampling at 192 kbits/sec. It has jacks for an external mike and external earphones. So I built an audio attenuator and fed in music. It sounded great through the little speaker. Then I hooked it up to the home audio system for playback. Oh man - great HIFI! Was I surprised. And then, after a great many experiments, I realized that this little recorder records in STEREO! There is nothing on the box that even mentions stereo. I have no computer here, so this thing just became a music recorder. What a deal for $40! I rigged up an external power connection so it does not have to work on batteries. It also has a very good audio limiter, in case the audio into it gets to be too great. I'll check on the model number. More advanced units have SD cards and USB ports. As is, at 192 kB/sec, it get 21 hours of great HIFI stereo. You can lower the sampling rate. I am going to try this. The amount of music stored on there could be very great. Are there limitations with this little jewel? Sure. But, for what it is, I'm really happy. Will, that's it at lake Wobegon. I hope I spelled it right. Bruce, "W 60 HZ" - AM 1020 "The best hum on your radio dial"

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Thanks RF, my mind did not remember that you'd sent a schematic. I will find it and start the "101 Experimenting". which I agree, can be fun.

Being a guy that goes overboard until he needs rescuing, I might ALSO get that all-in-one little circuit card you linked, because it looks neat in the picture.

Experimenters often end up with too many parts after it's over, for example I have two 13.560 oscillators in a world where you can only use one at a time.

Give me a few months.

Posted : 05/11/2012 7:02 am

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