Archive for the ‘Radio Frequency’ Category:

2012-03-13 Scientists Render Fiber Obsolete(!)

on March 13th, 2012 by - Comments Off on 2012-03-13 Scientists Render Fiber Obsolete(!)

Boffins = scientists in UK speak. http://www.theregister.co.uk/2012/03/14/neutrino_comms_demonstration/ People don’t realize that the Sun generates a huge amount of neutrinos, and every second, 65 billion of the little particles shoot through the area the size of your little fingernail, no matter where you are, because neutrinos go through the earth (and you) like it wasn’t (and

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2012-02-01 Regen Receiver Overdesigned?

In the RegenRX2 RegenRX Yahpoo group, an overflow group for RegenRX, WU2D posted RegensWU2D (a PDF file), showing two two transistor regenerative receivers. The first one, “Bipolar Two”, shows the schematic for a two transistor receiver using a NTE108 for the regen front end and a 2N3904 for the audio amplifier.  The NTE108 is a

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2012-01-21 Power Transformer for Line Operated Tube Equipment

I see a number of good designs for vacuum tube (thermionic valve) regenerative receivers in the Yahoo group Regenrx.  Tubes are hard to obtain and notoriously inefficient; reasons why they would be my last choice for a receiver.  But one area they have a big advantage is for use in a ham or SWL receiver

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2012-01-19 AGC Amplifier, FET and HV Transistor

Leonard Meeks posted a schematic of  Mk.7 Mod 2 AGC amplifier to the Regenrx Yahoo group.  I’ll include it here. The amp uses a FET for the input stage, a 2N3904 for the second stage of amplification and two high voltage transistors for the third and fourth stage. For now I will talk about the

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2012-01-18 Q Multiplier Experiment (Regenrx2)

Q Multiplier experiment in Yahoo group Regenrx2. You heve to join the newsgroup.  

2011-12-26 1.5V FM Transmitter

Reasons  I have some small 2V solar cells that put out about 20mA when well lit.  When I use this solar cell to charge a 1.2V Ni-MH AA cell, I need to put a diode in series with the solar cell to prevent current from the battery from going back into the solar cell.  If

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