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Hi Jose. This may not be important, but remember that if you need X2 mode, then 950kHz will not pass through a standard 630m LPF. 73 David

Hi Kelly, Thank You for taking the trouble to do that, a useful reference. regards Alan

correct you can actually notice the CPU locked up in the video - the unit was not transmitting and nothing but power connected.

Nice and concise video. The kit is not transmitting, just power on.

I see a lot of confusion on the email reflector about how to do the current bias method described in section 7 of the assembly guide.https://www.qrp-labs.com/images/ultimate3s/assembly_u3s_r3_a4.pdf I

Here's the link to the LPF's https://www.qrp-labs.com/images/lpfkit/assembly_A4.pdf

Dave VE3KCL Does this indicate possibility of a longitude path instead of the usual latitude based one? Might be interesting if your balloon could say G'day Mate to the hams from down-under. Arv K7HKL

Aren't these listed in table 1 of LPF assembly PDF?

Hi all. I am waiting to receive the lpf kit of 600 mts for my U3, I have 3 toroids T50-2 that I am winding to advance time, to fine tune the number of turns?I need to know the?correct inductance

Hello Hans, Perfect, a hex file is fine, I have blanks and can burn one here, that's very good of you!! chris AT chriswilson DOT tv All the best, don't burn yourself out :) Monday, June 12, 2017 --

no pictures from this launch , thay all look the same, here is some pic:s from BSS5 prep and launch, ?BSS5 (

Hi Chris I have an awful lot of things going on at the moment, QRP Labs product developments etc.., and I have not had a chance to finish off the v3.13 firmware. I think the best solution will be for

Hi Camille You are right, the firmware document is inconsistent with itself. I have now amended the diagram in section 3.1 to show a jumper across the switch which causes the ProgRock firmware to

The S25 Balloon woke from the dead and is now 7 or 8 degrees from the north pole. Spots are very thin from the top of the world but this time of the year the sun shines all night.

Very good work Mikael, Perhaps I missed it but do you have any pictures of your balloon? John K5MO

Hi, I have understood that, when relay-switched LPF kit is in use (is?plugged, with LPF kit in?place?"1") the RF out?can be accessed from multiple locations?on the relay-switched LPF kit board.

Hello Ivan. That's good to hear that you've got it to TX now. I use a very sharp craft knife to scrape the enamel off the wire. This seems to work much better than emery cloth or sand paper. Place the

Uh-oh . . . Balloon 100 vs Telemetry 98 . . . pretty good result Mikael. If the track were straightish that'd be 40,000 k in 528 hours, so 75 k/hr but really over 100 k/hr for a convoluted track.

BSS6 never checked in yesterday, most likely marks the end of this flight, lots off new personal bests, duration over 22 days, altitude record -10800m, distance traveled, moste likle crossing of

Thank you all again for the comments. We resoldered the low pass filter toroids. They seemed very problematic as the wire would not allow to be tinned even after we tried some sand paper. I think we