Iltarastit Luukki

A few weeks of Iltarastit on Sundays now, before the end of the season.

A bit of searching inside the control circle on 23, then from 15 about 45-degrees wrong direction towards 38. Just before 39 a turn downhill and had to circle back to the control.

RF-multiplexer, 3rd prototype

This is the third prototype for the 1:8 RF-multiplexer ( The board is now simplified with only one 10-pin ribbon-cable attaching it to the Arduino MKR Zero + Ethernet shield. Traco PSU for 5V supply.

Iltarastit Paloheinä night-o

A bit windy but quite warm and good temperature for running. Fairly easy course but it's always more fun in the darkness 😉

Luukki MTB 23k

A bit of rain but not too bad, quite warm.

Most of the narrow trails on the northern/westward part of the route were too difficult for me to ride. The beginning and end were on gravel-roads so no worries there.

Luukki MTB 'half-course' ca 23 km.

10MHz-to-PPS board, rev2

A second try at the PPS board, this time with the correct footprint for the transistors on the sine-to-square input stage.

Still some bugs left as I had to add a diode on the MCLR pin for the PIC-programmer to work correctly.

1PPS output is phase-coherent with the 10 MHz input.
10 ms long 1PPS output, ca 2.7V into 50R load.
PPS-board, rev2. sine-to-square at the top. Sync-input and dip-switch in the middle. PPS-outputs at the bottom.
PPS into 1 Megaohm - with ringing and 3.3V amplutide..

Iltarastit Pirttimäki, night-o

First night-orienteering this fall!

4V course, Iltarastit Pirttimäki 2018-09-10

Pirttibacka MTB 25k


Maybe Luukki MTB next week?

Itärastit paloheinä

Fairly easy course avoiding the big hill. Bad direction out of #1 towards #2, otherwise mostly OK.

Warm +21C or so.

Arduino MKR Zero + Ethernet Shield

Here's a new revision of the RF-mux board, with a 10-pin ribbon cable for +5V, +3.3V, and SPI-signals from an Arduino MKR Zero.

Arduino stack: Ethernet shield, MKR Zero, and MKR proto shield

PPS-board prototype

An evolution of my PICDIV-board from 2016. Takes 10MHz input and produces 1PPS (one pulse per second). This one has a TADD-2-mini inspired sine-to-square converter on the input (far left), a PIC12F675 with Tom van Baak's PICDIV-code (right), an ICSP-header for programming, and output-buffers inspired by the pulse distribution amplifier. A 3-position DIP-switch (middle left) allows config-changes, and a blinking LED indicates 1PPS (middle right).

Fixed a few bugs in the first PCB-revision and will order boards for version two soon. Eventually to be published on github/ohwr - stay tuned..

PPS-board 2018 August prototype. Note bypassed sine-to-square circuit on the left.

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