#garfield Logs

Apr 17 2023

12:13 AM aandrew: ... coolant tubes?
12:23 AM aandrew: and yes I think there's probably close to 10k in parts here, not just in those containers but overall
12:23 AM aandrew: the microprocessors and FPGAs aren't in the pic, nor are the inductors, specialty chips or any of the reels
01:50 PM polprog: aandrew: wow thanks!
01:52 PM polprog: this is what i needed, it works without a custom sigrok build!
01:52 PM polprog: I have a CB radio arc now
02:21 PM polprog: i will be building a 40dB attenuator and a 20W nominal (designed for 30W) dummy load
02:22 PM polprog: though i just realized that they are essentially the same so i can just build a 40dB attenuator for 30W and use it as a dummy load with the output terminated
02:22 PM polprog: I think i will also want a 40dB directional coupler, i found a number of design guides
02:23 PM polprog: I repaired a friends CB radio, gonna be retuning it soon
02:23 PM polprog: sadly it uses a different PLL/asic and I cant retune it the "proper" way
02:24 PM polprog: I have to pull the crystal frequency, but the math shows that adjusting for zero error on ch19 gets me a 40Hz error on either end of the fourty
02:24 PM polprog: which does not matter for AM really
02:33 PM polprog: https://polprog.net/rozne1/ircjunk/cbradio/formel_1_schematic_notes.txt repair notes so far
02:33 PM polprog: cc WormFood
02:56 PM WormFood: I can't look at it right now, but ping me back if I haven't said anything after a few hours. I gotta take off, and do some stuff. Chat later.
04:56 PM polprog: sure thing, im going to bed now :)
04:56 PM polprog: https://polprog.net/rozne1/ircjunk/cbradio/formel_1_cb_radio_schematic.pdf
04:56 PM polprog: this is the schematic
08:40 PM aandrew: https://mixdown.ca/dump/rpizeroautocan.pdf busy busy busy
08:42 PM aandrew: ignore the STM32 RST# pin diode, I have that backwards, should be a dual CC not CA
08:42 PM aandrew: er the other way round... should be dual CA not CC :-)