Recent content by dougfgd

Non-linearity is at the root of all mixers and becomes distortion if it is unwanted . the parameters that are non linear can be resistance, or capacitance. Oscillators are created by negative resistance which is like negative friction, somewhere there is a wonderful simulation where friction is...

I have been promoting the passive inter stellar concept. Jason Hessels, associate professor at the University of Amsterdam likes the idea but has serious doubts about getting useful signal to noise so I have addressed this difficulty. A target stellar system will comprise many...

Radar; Fast Radio Bursts carry with them the chirp necessary for re-compression to raise the echo above galactic noise.. Select from an inventory of FRBs to match to the distance of local stellar systems so that an echo will occur at a convenient time. An accurate time slot means that a radio...

We are receiving coherent radio signals regularly with modulation that are 4 milliseconds long inconveniently they that turn up at random intervals. The signals have been traveling for millions of years and we don't know if they contain useful information. Will make a good basis for science...

Demographics point to increasing need for designs to support the elderly Design, systems to help

Much of the planet is under cloud; solar concentrators for cloudy skies are possible with graduated refraction/index material ; difficult but more practical. There is an astronomical sphere of astronomical dimensions that looks like a semi transparent Dysonsphere NGC7635 any other less exciting...

Your question reminds me of Einsteins thought process where he imagines traveling with a light beam. Did him a lot of good. Imagine living without a time dimension, able to communicate with your ancestors and decendants. Sounds "primative" tribe under the influence of mind altering drugs.

The Art of Electronics is a good place to start . Regularly updated it was first published 25? years ago.

This is spread spectrum ; because of correlation the longer the code sequence the narrower the bandwidth and better the signal to noise, I think a short gold code sequence is used for synchronization on your mobile phone. Think of 1024 bit sequence as 1 bit with error correction. A long...

If you can support yourself for a while find a minority need, look to hardware and software to be adapted to that need you could just be elpful to people.

I was involved with pseudorandom series for communications. For example Gold codes and Voyger randing codes. Do these codes apply with other number systems and hence throughout the universe. Light speed communication will take years hence codes could be very long, giving very narrow bandwidth...

All intermediate fuels and that includes electricity require further inefficient stages. I fail to see the advantage of electricity which must need not only a 50% generation energy loss followed by a 30% distribution loss followed by a 30% storage loss. Better to concentrate on an efficient...

A fuel cartridge to be engineered that absorbs CO2 in series with or as a replacement f or the CAT and is exchanged when fuel is taken on board.The old cartridge to be used as a building material. Car connected up as CHP when not commuting. 2 state Thermal storage cartridge used to store 70%...

I recall that gamma wavelengths are shorter giving higher resolution. Though not coherent gamma emitted by radioactive crystalline materials can detect very small velocity changes between emitter and absorber...