Despite length-matching traces between a distributor-stage and the individual output-stages on my pulse distribution amplifier there remains a 2-300 ps peak-to-peak output skew between the channels.
Here's a test where a 50 pF or 10 pF trimmer-cap is added just before the input of the output-stage. I found that tuning the cap results in a variable delay of 60-80 ps/pF, so if initially the channels are within 300 ps of each other the 500 ps tuning-range of the 10 pF trimmer-cap is sufficient.
As a test I first tuned all channels to within 20 ps peak-to-peak, then verified this the following day and got 52 ps peak-to-peak. BNC-connectors might not be the greatest for picosecond level repeatability.
Decent running for a change... I decided to run without compass on this easy map, and this seems to sharpen the mind and senses. 5th overall until control #3, but then dropping to 9th on #4 and 10th at the finish. The route choice to #4 is maybe too safe, driven by the lack of a compass (see also #11)..
Half-decent on odd controls, 1, 3, 5, 7, and 8, Finish. Problems on 2 turning (+3min) the wrong direction, then see-sawing back and forth close to 4 (+6-7min), a large detour to 6 (+6-7min, the straight-line route choice is too hard).
First test of newest toy, a Garmin Virb Ultra 30 action-camera.
This mode records one 4k frame every second, together with the in-camera GPS position and data from ANT+ heart-rate, cadence, and speed sensors. No idea on how long the battery lasts in this mode yet.
Just before #2 I found a wrong control and circled back when just 50m forward was the right thing to do, probably +5 min or so.
Then down from #7 in completely the wrong direction and another +5 min or so.
Autumn-season 2017 opening for Itärastit. Choosing where to go up or down the steep hill to hit the control is always hard, here problems at #6, #7, and #13. The edges of the map both around #10 in the south and around #15 in the north are fairly simply drawn and in need of an update. Warm +22 C and humid.