engsol wrote in
:

One thing I see missing as to short range is the TR time...i.e., how
quickly after the tx pulse quits can the rx receive and process the
echo. It's possible to "blind" the rx even if the isolation between
tx/rx is 100 dB or better. Anyone know some numbers?

The modern ones are really fast. The 2KW Raymarine radome, before it rots
from the condensation in the dome, can see the 3rd boat down the dock.
That's really fast at the speed of light, especially considering its
antenna is simply a printed circuit board array of microstrip dipoles. I
don't have the specs on its pulse width, but from the outward resolution
I'd say it's very short, indeed, which accounts for its very low average
power drain on sailboat batteries.


Norm B (who has never worked on a solid-state radar, but has on
tube type 2 and 5 mega Watt ones)


Navy? AN/SPS-6? SPS-55? SPS-30? SPS-21, the old Raytheon Pathfinder?

Been there, done that, got the T-shirt...(c; Old Navy Fart, here. The 30
could see the moon if you kept keying the repeater with pulses on its
trigger input. It would kill a seagull in its beam out several hundred
yards.


--
Larry

You know you've had a rough night when you wake up and your outlined in
chalk.