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WD4AH was receiving both payloads well today. No GPS put one transmitter nearly right on top of the other when it should have a 2 minute separation. Interesting to say the least but at least they are

Both flights are identical...too bad the GPS is not working on the first that was released,but knowing where the second one is will give a clue if they are heard tomorrow. Few spots all day today as

The Teensy 3.5 and 3.6 have floating point processors which might help. Jack, W8TEE

Most of the computations are in 32 bit floating point. Doesn't really matter that it's an 8 bit CPU if the computations can be carried out at the required 8khz rate. ? Primary limitation I see is the

Yes, more jitter with fractional output dividers, but not as much as you might think. If we mostly care about maintaining RF phase accuracy over millisecond long intervals, then we may be better off

This is pretty cool to watch. ?Looks like maybe it's getting tossed around up there and not making a little bit of progress.

Hi Alan, Many thanks for bringing me up to date with materials used for thermal imaging lenses.? I am amazed at the low prices of the Chinese lenses.?? Richard G3OTK

Hi Richard, Zinc Selenide is the preferred lens material for 0.6-22 micron use, very widely used as the focus lens in CO2 gas lasers at powers <100W or so. Ge only has a range of 2-12 microns in

Jerry, The cameras that you mention with the IR filters removed are not suitable for thermal imaging.? The reason is that silicon becomes transparent above a wavelength of 1.1 microns and so has no

Jerry, The problem is not that alone.? This design gets a amazing about from the 16mhz 8 bit CPU. When you round the results to 8bits you get truncation and rounding errors so 1/256 is not a great

If we use a fractional output divide and leave the VCO parked (as done on the uBitx), the change in frequency is instantaneous?and thus we might reduce the phase errors somewhat. Worth trying, but

Signals are VERY BAD...something not right...still guess bad components. These builds are routine for me and these are just bad. Dial freq for both QRSS and WSPR - 14.09560 USB QRSS just under

There are presently 2 x G0UPL (ID) WSPR/QRSS balloons for 20m band in progress as of a few hours ago. QRSS uses ID of U3S followed by grid/altitudes in meters. Both share identical transmission

Another interesting use of IR thermometer is to check the relative temps of the BS170 in designs that use multiple 170s.

Guido's low level i2c_SendByte() uses bit-banging, that code could be considerably tightened up for speed. I suspect 800khz is a measured figure for that particular code, and may not be?the maximum

Hi Jerry: One of my Christmas presents was the infrared thermometer from HF. It works well (e.g., I now know I like my coffee at 127.5 degrees!) and I use it often to check heat sink and component

Would a Raspberry PI IR camera be any use to see hotspots on the pcb?.

I find my Harbor Freight item 93983 to be well worth $12. And sometimes it's on sale. ??https://www.harborfreight.com/non-contact-pocket-thermometer-93983.html I suppose if you wanted to verify it

Great Idea!? Once per month, maybe.? Keep it simple, though.? One award per band.? Set a narrow range of frequencies.? Slow speed, please for the rest of us.? Since the rig is well known, the

I managed to attach and get the connection under the toroid, so I think I'm alright adding the turns. I'll try that tonight. If that doesn't work, I have several values of NP0 that I've been