from FB group Regenerative Radio… Jun 13 I’ve thought about using plug-in coils, but I’ve had experience with Grid dip meters and there are a few important issues that must be dealt with. One is, what happens to the unused coils when the equipment is not in use. They get separated from the equipment and
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from FB group Bell Telephone… Jun 11 I’ve seen this 3 wire crossconnect wire, but I can’t remember where. Long ago we had racks of datacomm with a patch panel with patch cords. We used 3 wires of four wire IW, one wire for common, one for transmit and one for receive. These were for
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from FB group Regenerative Receiver… Jun 13 Cyril Hodson It seems to me that these plug-in coil forms would be easy to make with a 3D printer. They would be made of thermoplastic so I don’t know if there would be problems with soldering pins or with being close to tubes/valves. Your idea of using
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From YouTube video Denmark is Riding the Winds of Change, June 5 It amuses me how these dilettantes (with 1st names starting with K) argue about the pros and cons of bullshit (biomass) while the world is going to hell! 😡😡😣😣😲 Why are you concerned about trivialities when we should be concerned about the future?
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from FB group Bell Telephone of.. June 3 If the elevator phone wasn’t working, I had to hustle over and find out why. If the phone was not working, the security was supposed to tag it as out of service. That was definitely my scariest job. Most of the time the POTS line came into
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I hear others complain about the high cost of variable capacitors, especially the older air variables with metal plates. So I decided to DIY and make one. This is my first attempt so forgive the lack of elegance and unfinished look. I’m sure it could be improved on and made better with some effort. The
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from FB group Bell Telephone of.. May 30 Alan H. Immerman Well, underground, in a duct, the fiber and the plastic conduit looks like it was installed yesterday when it’s dug up a dozen or more years later. There is no weathering or UV deterioration underground. But then there are vermin that can chew up
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Also posted part to FB group Building Transistor Radios May 30 I built this coil by winding 20 turns 28 AWG enamel coated wire on a soda bottle cap. It has an inductance of about 17 microhenrys. I wound a tap for the antenna, but it would be more stable if a separate coil with
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I Can’t Find One I’ve seen several AM broadcast band transmitters on websites and on YouTube, but all of them require a 1 MHz oscillator module, which is difficult to obtain. I see modules for every other frequency not in the 550 to 1600 kHz AM band, but it seems all of the ones (and
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from FB group Building Transistor Radios May 25 Loren Moline I don’t think the book insults your intelligence. The book itself is often written with subset of readers in mind such as beginner, professional, mathematics challenged, etc. It’s the failure of the book advertising to make that clear. I believe the book advertising hypes every
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