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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.

Firmaliiga Pirttimäki

The third and final Firmaliiga event this autumn was at Pirttimäki. Fairly easy course.

OK to #1 but then too much zigzag to #2. #3 and #4 are the best splits - mostly running along paths.

Out from #4 south towards the path through the woods - slowly. Sticking to the path would have been better? Again not so great down the hill towards #6.

Firmaliiga Velskola

A lot of running along roads on 1-2, 2-3, and 3-4. About 20th place on #4 before any slow parts or mistakes.

No real plan or inspiration on 4-5, just slowly along the straight line. Stupid mistake on 6 where I looked for the control on the wrong hill before finding the same path I took on 1-2.

Firmaliiga final event in Pirttimäki next week.

Firmaliiga 2018, Velskola, E-rata

Itärastit Latokartano

Itärastit fall-season opening - more to follow until early October.

More paths and less forest both to #4 and #5 might have been faster. Lower, rather than higher, route to #11 looks better. Not much else going on orienteering-wise.

Next is firmaliiga 2/3.

Firmaliiga Haukkalampi

Stumbled on #5 more or less accidentally and that messed up thinking for #6 which is the worst split.
More or less tired legs for the up/down hills at the end on #8-#9-#10. Otherwise mostly OK.

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