You do not need anything in position 0, to get more configuration screens increase Txs, find it in the menu options, to say 6. Take rf from the right hand sma position on the lpf relay board. Andy

Walford electronics make a superhet kit for 20, 40 or 80. The Ham and Hale. Very good kits, i made mine up for 20m, 5w out and works very well. Ssb and cw, agc, rit, i built a digital readout for mine

Hi Mark, You can put the 80m filter anywhere you like but I'd avoid placing it in slot 1, put your 10m one there as you say. The filters are selected in software so can go anywhere you just need to se

Simple solution George is to use a u3s for wspr. No problem then. Andy

When soldering through hole leaded components i was taught to place tip of iron, pre tinned, to the pad first, wait for 3 seconds, slide iron to junction of pad and lead, apply solder then slide tip o

Don't worry about it, in the summer when it's hot my u3s gets hot and the display flashes or loses characters, always sorts itself out when it cools down. Andy

Use Superglue Gel. It sets slower. Or press the parts together and run the thin super glue into the cracks or spaces between the pieces. I have done that many times repairing my wife’s ceramic statuet

I use 3 7805's in parallel for my u3s, a single thick power cable in to a piece of copper clad board glued to the case then separate leads to the inputs of the regulators. I have the ocxo, u3s main bo

#u3s #building

I use 3 7805's for power supply, all with caps fitted. 1 feeds the pa, 1 feeds the heater and 1 feeds the rest of the u3s. Simple. It all fits inside the case along with the relay board. Then I can ju

Bear in mind that you don't have to tx all 6 bands together. You could just use 1 with an optimal antenna for best performance on that band. Change to another band as propagation changes maybe. Andy

Mine usually says "=" after calibration, with 0 drift reported on wspr so I'd say that it's fully calibrated. Getting spots on wspr depends on more factors than just a zero calibration though. Have yo

What do you have the calibration parameter set to? How many tx slots? Did it ever calibrate? Andy

Hi Joseph, Sorry, I remembered incorrectly, the u3s should have 1 bs170 and output taken from either Q2 or Q3, is C5 removed from the u3s board? 73 Andy

Hello Joseph, I see that you mentioned replacing the bs170? Is this the bs170 on the u3s? I thought that for driving the 5w pa no bs170 was used, just 2 wires from where the bs170 should be to the inp

Predictive text, Al should have been all.

IiRC when I built mine there is a pad that needs to be grounded to turn the amp on, its Al in the manual. Andy

I have both a couple of u3s and a Rfzero, the rfzero is far superior to the u3s. Definitely worth a look, and you can write your own software. Andy

#programming

Hi John, Changing the value from 20 to 23 in menu will not alter output power at all, to adjust power you would either have to increase pa bias or increase the pa voltage. Andy

Hi Stephan, The counting is simply because the time has not been set in the menu, I assume you are not using the gps? As for power, this could be a number of things, check that you have it biased prop

#20m #error

Hi Bill, No, you do not need a filter in 0 and the u3s schematics are incomplete. Andy