In message
,
writes
for communication over a copper pair into an extremely noisy area,
manned by a non-code-proficient mechanic, at sea with intense
vibration.

seek standalone (ie, not a computer-sound-card-based solution)
hellschreiber gear. if it works nicely, might attract official
purchasing in quantity


That would surely be a bit primitive in today's world.

If your main concern is the noise cancelling and your operatives can
manage to operate a radio then the Motorola Mototrbo range of radios
have exceptionally good noise cancelling. I have installed them in
paper mills and power stations where it is impossible to speak to the
person next to you because of the noise and they still work well. On
one dem' the bosses refused to accept the operator was in the generator
hall until they saw him there because the audio quality was so good.


http://www.radio-links.co.uk/files/1180438189DP3400.pdf

Sorry to all the wingers on uk.radio.amateur these are digital,
hence the good audio processing. :-)
--
Bill

wrote:
for communication over a copper pair into an extremely noisy area,
manned by a non-code-proficient mechanic, at sea with intense
vibration.

seek standalone (ie, not a computer-sound-card-based solution)
hellschreiber gear. if it works nicely, might attract official
purchasing in quantity

Have you thought of PSK-31? Take a look at this:

http://www.nue-psk.com/
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Use only Genuine Interocitor Parts" Tom Servo ;-P

In article m,
says...

wrote:
for communication over a copper pair into an extremely noisy area,
manned by a non-code-proficient mechanic, at sea with intense
vibration.

seek standalone (ie, not a computer-sound-card-based solution)
hellschreiber gear. if it works nicely, might attract official
purchasing in quantity

Have you thought of PSK-31? Take a look at this:

http://www.nue-psk.com/

They're a really good bit of kit...Be aware that all the units are hand
built, so may take a while to arrive (Mine took 3 months, but I did
order from the first batch) - I'm not sure what the turn around
currently is, they may have a number of ready built units in stock!

Its software upgradeable, now does RTTY, and I think CW isnt far off,
you can add USB to it, which makes upgrading easier, and it also does
logging..I think its probably best to look at the site for the lowdown..

The only moan I have is the battery compartment, its a bit of a fiddle
to get 2 9v/PP3 batteries in there...but once you've got the knack, its
simple!

Not used mine actually 'in the field' as of yet, but the RX performance
alone is astounding!

73

Mark (MW1MDH)