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Hi Barry, My up501 has just arrived from taiwan and am eager not to blow this one up ! Did you place any resistors on the unit and if so what value did you use. I will be supplying the unit from a

Does anyone use these modes at all for beaconing or MEPT's ? (I see plenty of activity withthe Slow Hell mode, since that can easily be seen on a standard speed QRSS grabber.) 73 de Andy

Yep, been there seen that. Yes indeed. 73 Eddie

Hi Eddie Thank you for your insight into the slow Hell.. math. Trying to isolate the issue, I recently I mapped some Hell figures into the special messages mode and was pleasantly surprised to find

Hi Dave I think you are the only person to have mentioned Hell Modes on the U2, and there have been no replies. During initial tests I abandoned the Hell Modes early on as all results I was getting

Hi, I have not checked the topology chosen by Hans for the PA and this is just for comparison. With the KD1JV ATS/MTR series of transceivers, we achieved 5W from 3 Bs170 at 12V on 20 meters CW. Power

Thanks, Dave. I have a bag of BS170 and don't see marks to identify the maker... I put a heatsink on for good measure and also a variable PA supply separate from the supply that feeds the board.

Has anyone tried running 3 x BS170's at 12v yet AND measured the output at 28Mhz please ? (Please note, if you have nit used 28Mhz yet then you might need to tweek the blue DDS pot to get it

Sorry that should be 830 mw max dissipation on the bs180 to-92 Dave

Paul I was running a matched set of 3 Fairchild transistors and they are rated for 830 ma max and can take quite a bit of heat max 150c which should put over 2 watts out. I am using a small wattmeter

My U2 was putting just over 12 volts peak to peak into 50 ohms on 80 meters using a 5 volt final drive (LM2596 switching regulator) with one final. I installed the other two finals and only got an

Hello All I am really enjoying this kit and have had great results on WSPR and other modes. From Canada on 20 meters the U2 easily Wsprs around the world and the frequency calibration is very stable

Dale, be sure the Shield does'nt get claustrophiobia. It seems a common problem with homebrewed equipment these days. Probably something to do with global warming or summat. :-)

Thanks Hans I set the switches and started Argo and everything seems to work properly. Now I need to put it into an enclosure and put it on the air. Thanks again 73's Dale W0IR From:

Hi Dale In the sample sketch provided, two of the switches (S3, S4) set the speed: // Read the switches, to set the mode and speed mode =

Can some on tell me what the switch setting should be on the QRSS Arduino Shield. I believe I should be running the board QRSS3. Thanks Dale W0IR

Yes Andy, that was my thinking as well. What I have done on other boards is clear the hole with a piece of the Enamelled Copper Wire with the end cut across at 45degrees, it seems good enough to

Hi Colin, Yeah I got sway with it on one, but not the other. Just a bit too much plating in the whole to allow it to fit. Using 0.5mm wire is nicer though. It does allow quite a bit more tensile

Cheers Hans. I've just put in my order for some of the Scientific Wire Company. (Used them for years, always a good supplier.) I have plenty of 0.5mm, but the through plating is taking up a

Hi Andy, If it is any help, I have managed to used 0.5mm Enamelled Copper Wire on an LPF, it was a tight fit but not too tight once the Enamelling was cleared off. 73, Colin M0XSD. Sent: Tuesday,