[Milsurplus] Re: [armyradios] OT: Foxhole Electronics

[J Forster]

What amazed me was that two way RADIO communication would have been barely possible across
the lines using mostly telephone bits in WW I.

-John



Robert Nickels wrote:

> J Forster wrote:
> >
> >  Believe it or not, you can build both a receiver AND a
> > transmitter, as well as other things:
> >
> > http://home.earthlink.net/~lenyr/index.html
> > <http://home.earthlink.net/%7Elenyr/index.html>
> >
> Some of you may enjoy taking a look at my recent effort to replicate and
> improve on the K7NS zinc negative resistance oscillator.  I've added
> "crystal control" and "high level modulation" ;-) - with oscillation as
> high as 3.58 mhz:
>
> Short video:  http://www.youtube.com/watch?v=cDBpBYkRw0Q
> Schematic:
> http://picasaweb.google.com/RANickels/ZincNegativeResistanceOscillator
>
> Note:  while it *does* work, be prepared to spend LOTS of time patiently
> probing the surface to locate a spot that exhibits a negative resistance
> characteristic. There is obviously room for improvement, such as a
> proper cat-whisker and more efficient antenna coupling.   Think of it as
> a way of reliving the early days of radio!
>
> And of course we're talking very low power, but with an antenna, I was
> able to hear the BC band signal around the house.  Just remember -  it's
> made out of junk!
>
> 73, Bob W9RAN