Re: Are LEDs a noise source
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We mechanically modulated ours. Much easier!
Simplest was to just run the beam though the blades of a muffin fan.
Turning the fan at about a 45 deg angle greatly improved the on to off ratio.
With a more controlled motor and disk with a pattern of holes,
precise modulation tones can be produced.
On Sunday, January 24, 2021, 12:16:44 PM CST, Robin Szemeti - G1YFG <robin@...> wrote:
It is *quite bright*, sets fire to the shed door ... pulls 30 amps from the mains, watercooled. The usual lamp-pumped YAG laser with a ktp, so not a gas laser. This one is q switched to improve the efficiency of the ktp frequency double The Q-switch is fed with RF at about 100MHz, which can be gated with TTL logic. I'll have to experiment with pulse rates one day.
On Sun, 24 Jan 2021 at 18:05, Andy G4JNT <andy.g4jnt@...> wrote:
Robin Szemeti - G1YFG