anderswallin.net

Itärastit Svedängen

Mistakes at the start into #2 (passed really close on the first try) and direction into #3 (should have found the dashed stream?). Otherwise quite easy running along roads and paths. Sunny and +15 C or so.

120 MHz FGA01FC/OPA818 photodetector with 12 kOhm RF

PCB: One Inch Photodetector

Transimpedance model: TIASim

Previous similar designs:

200 MHz photodetector (RF 4k7)
400 MHz photodetector (RF 1k2)

Firmaliiga 2021/6 Velskola

Easier course than the last two weeks - mostly running along paths. +15C or so.

New SMA-to-SFP breakout boards

I made a new batch of the SFP Breakout Board.

With a 1 Gbit/s SFP transciever the bandwidth when transmitting from the TX port of one board to the RX port of another board seems to be almost 1.8 GHz.

Firmaliiga 2021/5 Kattilajärvi

Rainy and wet but quite warm. First a loop looking for #6 too soon, and then along the wrong hill towards #7..

Firmaliiga 2021/4 Haukkalampi

Start of the Firmaliiga fall season at Haukkalampi. Maybe +20 C and quite humid.

Lots of running along tracks/paths and then up/down a steep stony hill to fetch the control. Confused about the many paths inside the 1-2-3 triangle, then looked to early and too high for #6. Otherwise okish.

Husdata datalogger for heat-pump

I got this husdata datalogger for my heat-pump.

It plugs in to a 3.5mm audio-connector inside the electronics box of the pump. On an IVT geo 312C pump it's fairly easy to install by removing the big front cover, then a smaller black cover, and then opening the electronics-box. I routed the wire into the pump via a tube-hole at the top, and then through the cable-hole of the electronics box (lower right). It plugs into a 3-wire 'BBT' interface.

The datalogger reads info from the pump and broadcasts it over wifi either to the husdata-website or over MQTT to any compatible device.