George Magiros

RF Apprentice. NN9F. RTs & likes do not equal endorsements

[George Magiros @gmagiros]

Got AI to run my measurements (I lied about ecal). Now I just need to actually do measuring, AI or not.

[George Magiros @gmagiros]

Pushed my tty truecolor waterfall viewer. (Better than the radio software in Invasion) https://t.co/z6INea4MfS

[George Magiros @gmagiros]

A quick way to measure mutual inductance using a LCR meter. Read direct from inductance measurement. Keysight Impedance Measurement Handbook

[George Magiros @gmagiros]

My new favorite board. Pro Micro nRF52840

[George Magiros @gmagiros]

No partial credit for this

[George Magiros @gmagiros]

@10mozet Openems. It can do s-params. Add a port with AddLumpedPort. Then calc sparams with
s[:,m,n] = ports[m].uf_ref / ports[n].uf_inc

[George Magiros @gmagiros]

There was no real consumer solution for measuring mirror temperatures. This is cheaper. A bunch of ds1820s

[George Magiros @gmagiros]

My emergency power solution. It charges my mac air

[George Magiros @gmagiros]

Tuning the PI algorithm for my maksutov dew heater. ... Outside

[George Magiros @gmagiros]

I've been sending my pubsub messages to discord as well as bigquery. Nice for debugging and notifications. It was for my VNA. Now a side quest for my telescope.

[George Magiros @gmagiros]

@DimitriosKottas How do you tune that beast? Dishal's method?

[George Magiros @gmagiros]

my dew heater in an enclosure. I use a PI controller. No D. The serial protocol is just json. Both ways

[George Magiros @gmagiros]

@emh203 I like to use python lib shapely to draw it (eg. microstrips from experimental data) and then convert that to a kicad footprint for import.

[George Magiros @gmagiros]

I got NINA to talk to my seestar telescope! I had to bridge my windows 11 VM off the WiFi interface on the mac to get alpyca discovery to work. (station mode banned) I need to use pf instead of bridging since now the VM cannot talk to the Internet.

[George Magiros @gmagiros]

100 ohms I mean. Here is 33 ohm for perfect dampening

[George Magiros @gmagiros]

I used a rc snubber of .01u and 10 ohms across the pwm driven mosfets of my dew heater controller. The cap is not too large to delay the pulse against a 10 ohm test load. The pix is off the load of a 3 ohm strip

[George Magiros @gmagiros]

Here is 10 ohms. The frequency is 10khz.

[George Magiros @gmagiros]

Here is the circuit. Is there another way to do this without protoboard?

[George Magiros @gmagiros]

For my GCP PubSub subscription to BigQuery of jsonrpc messages, I wrote this transform. Check "use table schema". (It for a distributed rf and telescope control bench).

[George Magiros @gmagiros]

Trying to make a dew heater (PI) controller for my telescope using the pico. The set point is 3 degrees over dew point. The heating is faked to test.