On 1/4/13 11:34 AM, Ed Palmer wrote:
They are neat toys, aren't they? :-) I discovered them a couple of
years ago. Since then I've collected a few from ebay to play with.
They're oddball units with no documentation, but they weren't too hard
to decipher. I even cobbled together a phase-lock system for one. It
worked, but it was too noisy for my needs. It seems like YIGs have been
superseded by VCOs for most applications - but I'm by no means an expert.
Most VCOs don't have multioctave bandwidths, but YIGs do that with no
sweat.
YIGs are also used as wideband tunable preselectors.
Back in the 80s, I used an EIP counter to drive a YIG as a wideband LO
for a spectrum analyzer kind of application. The counter had the right
coarse and fine outputs, and was controllable via GPIB, etc.
There's some companies making very small (1 cm3) YIG oscillators with
wide bandwidths and really good vibration/shock tolerance, as well. I
suspect that the application is something like small jammers dropped
from planes and the like.
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