Mark Conrad wrote in :

Wonder if any hams are experimenting with liquid nitrogen cooled
RF front ends to their rigs, to reduce thermal noise.

With the high background noise floor already present on Earth, would he
few tenths of a dB or so of thermal noise reduction from cryocooling
make any perceptible or significant difference? Above HFis a different
story, I think, but the noise floor on HF -- at least around here -- is
really rottenly high.

--
Mike Andrews, W5EGO

Tired old sysadmin

In article , mikea
wrote:

With the high background noise floor already present on Earth, would he
few tenths of a dB or so of thermal noise reduction from cryocooling
make any perceptible or significant difference? Above HFis a different
story, I think, but the noise floor on HF -- at least around here -- is
really rottenly high.

Yeah, guess you are correct, not to even mention the RF
coming in from the cosmos, let alone man-made RF.

Okay, time to break out my next hare-brained idea,
short million-watt pulses, bounced off all the space junk
we have floating around.

Lemme see, one-watt input, pulse length a billionth of
a second, one thousand pulses per second.

Hmm, where is the FCCs phone number, now all we have to
decide on is what frequency to use. Very low infrared band not
being used for anything right now, I could mount an infrared
window in my roof, and let a Yaesu modulated laser handle the rest.


Now ya see what happens when an old ham is away from his ARRL
handbook for 55 years.

Mark

On Sat, 20 Mar 2010, Mark Conrad wrote:


Now ya see what happens when an old ham is away from his ARRL
handbook for 55 years.

If you know about Ten-Tec, and coherent CW, then it hasn't been 55 years.

Ten-Tec started in '68 or '69.

Coherent CW didn't arrive till the early seventies.

Michael VE2BVW