Bryan Grigsby
Bryan Grigsby
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Hunting RFI noise source - long version
I believe I found one of my biggest RFI sources around my QTH. It took some trail and error, and I second guessed myself a number of times. I initially thought this RFI was from the nearby high voltage lines, but after more inspection, it seems like it's on a power pole below the lines.
มุมมอง: 206

วีดีโอ

Prusa Mk3s+ bed heating with Pulsar Thermal Scope
มุมมอง 9ปีที่แล้ว
The bed is heated to 85c. It's not too exciting. You can only really get an idea that it's getting hotter by looking at the LED on the panel in the lower right hand side, which seems to get dimmer and dimmer. This is because the thermal scope is changing the reference for the hottest thing in the frame.
Disco32 DISCUS audio issues
มุมมอง 2Kปีที่แล้ว
Disco32 DISCUS audio issues I worked with Disco32 on these issues a little. They claimed there was nothing wrong, that I should run my radios at full volume to avoid the clipping sound. They also dismissed the bluetooth issues.
EASAT-2 & HADES 01.14.22 UTC 17:00
มุมมอง 1772 ปีที่แล้ว
EASAT-2 & HADES 01.14.22 UTC 17:00
EASAT-2 & HADES 01.14.22 UTC 15:12
มุมมอง 842 ปีที่แล้ว
EASAT-2 & HADES 01.14.22 UTC 15:12
HO-113 Date 01-10-21, 03:16 UTC
มุมมอง 792 ปีที่แล้ว
Audio removed, sped up 8x. Just a visualization of the passband, defined by some of the noise in the waterfall. A couple times towards the end/middle, I shift the waterfall frequency range to keep up with the doppler effect.
B-17 Flying Fortress Landing
มุมมอง 2510 ปีที่แล้ว
Flying Fortress Landing into Peachtree Dekalb Airport, Atlanta GA
Arduino UNO R3 as AVR ISP interface
มุมมอง 1.4K11 ปีที่แล้ว
Using the Arduino UNO as an AVR ISP interface for programming other microcontrollers. Also looking at an RS-232 "shifter" circuit to send and receive data between the microcontrollers TTL interface and the PCs serial interface.
Astable multivibrator
มุมมอง 13711 ปีที่แล้ว
Symetric circuit of LEDs, 220ohm resistors, 4.6k ohm resistor, 22 micro farad capacitors 3904 npn bjt transistor and 9vcc.
RTLSDR - Wideband receiver in a USB dongle
มุมมอง 70611 ปีที่แล้ว
RTL2382u, E4000 and SDR#
Arduino, one 4 digit 7 segment and 2 shift registers
มุมมอง 65111 ปีที่แล้ว
Arduino 4 digit 7 segment 2 shift registers
Arduino External Power Source
มุมมอง 2.3K11 ปีที่แล้ว
NPN BJT Transistor, Potentiometer, 12v 7Ah battery. Arduino controls the digital output to the base of the transistor by taking in the analog input of the potentiometer and mapping it to a digital value. When the base of the transistor reaches it's voltage threshold, it completes the circuit between the collector and the emitter, allowing current to flow to the fan.
Diode Tree
มุมมอง 5211 ปีที่แล้ว
Diode Tree
Numbers Station 5.855Mhz
มุมมอง 9711 ปีที่แล้ว
Numbers Station 5.855Mhz
Arduino LED w/ button
มุมมอง 7511 ปีที่แล้ว
5 LEDs with 260 ohm resistors and push button.