Archive for May, 2019:

2019-05-31 DIY Plastic Variable Capacitor

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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2019-05-30 Does Fiber Cable Last Forever

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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2019-05-29 Another Oscillator For AM Band

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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2019-05-26 Low Power AM Transmitter

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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2019-05-25 Books Insult Your Intelligence

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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2019-05-24 IR Slave Flash

Uncategorized

I had an old RCA TV with an early remote control that used an IR beam with different frequencies for 6 different functions. I also had a VCR with the newer remote that sent the codes digitally over a 38kHz carrier. I built a remote extender so I could use both remotes beyond their short

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2019-05-23 Color Perception And LED Lights

from FB group Building Transistor Radios May 25 Thomas Kirby Most LED lights now made have a CR (color rendering rating) of greater than 90. This is better than older LED lights and CFL lights, which were not good. If you have trouble seeing with your LED bulbs, check the label on the bulb and

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2019-05-22 Fiber Installing In Near Future

from FB group Orange Talk May 23 Jack What I’ve seen is the internet service providers have eliminated the lowest speeds and lowest prices of course, and now offer only higher speeds and higher prices. For the city of Orange, there will be at&t fiber cables installed in the near future, so Sputum cable will

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2019-05-21 Upstream Data Concentration

from FB group Bell Telephone… May 22 Keith Hlavacs I was connecting up equipment with cat5e and cat6 cabling capable of 1000 Meg’s, and there were 48 ports on the switches on campus. The GBIC feeds on, say, 4 switches were daisychained, so a total of 192 ports per fiber optic feeder. So… I see

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2019-05-19 No Go Showboat

from FB group regenerative receiver initiative May 22 Henrik Stenstrom I would like to build something hollow state with all sorts of gizmos like in this photo, but all of it would be a no-go showboat, just for looks. I would put Amber or orange LEDs under the tubes to make them look like they’re

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