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If you go step-by-step, it will probably take about a day? I guess it despends on how long your day is? I took a snapshot of the board after each step, plus double and triple-checked everything two or

can we get a confirmation on this please? Justin N2TOH

If you go at it buildathon style you could probably do it in a day. T1 took the longest for me. I pre-bent hte leads for the resistors and they went quicker than I thought. Add a case and all bets are

Hi Olgierd, Great to hear that the resistor solution worked for you as well. Not so good on the FETs and driver chip though! My board is a little battle scarred now with changing caps and Q6 several

I'm just wondering how long it is taking folks to complete the transceiver kit. I've got a limited block of time this coming week, and wondering if it will be enough. I am an experienced builder.

Hi Jan, I have just ordered some transistors from you. I have no idea what transistors I got from E-bay, they area Mosfets with 3 legs, but there the similarity ends. 73 Andrew PS I have ordered the

I've resurrected my old QRSS U2 V2.07 but having problems in getting out using WSPR mode. Everything sets up correctly. Transmissions start spot on time (using GPS module). WSPR cycles through all the

Hi, second solution - adding 10k resistor providing positive voltage to Q5 drain works as well, I got back to 1nF C33. My power output was still low (below 20Vpp) so I removed all of the final BS170,

Oh!? Yeah... I missed the obvious there didn't I. I'm afraid I'm drawing a blank (no pun intended) then 73 NE5U Mike

Did you change the configuration to match the other LPF? 73 NE5U MIke

When you use the GPS module the U3S can run a calibration routine, but rather than base the result on your operational transmit frequency you can specify a much higher frequency for the DDS to run at

I started to build the NorCal 40A Kit I bought ages ago from QRP Bob . I must have got the last one as he shut down shop very soon after I got mine . Not sure did I lose the resistor network component

Gents, I just finished building my first U3S and GPS receiver. Everything is working great so far. The operating manual is very overwhelming. I'm wondering what to use for "CAL" and "PARK" settings

It's nice to see two of the major ham-oriented suppliers of these parts, K5NWA and SDR-Kits, here in this thread. The Mitsubishi power FETs are not available from hobbyist-friendly distributors like

Hi Ologierd, I also replaced C33 (1nF -> 150pF) some time ago because I had the same issue. I did not see any oscillations since that. It seems that many people had the same problem. Most of the dead

As SDR-Kits we have supplied many genuine Mitsubishi transistors with zero complaints over the past 8 years. Many people who initially buy on Ebay are disappointed with poor output and high current

Hi Glenn, I have tested the solution provided by Hans yesterday, to replace 1n C33 with 180pF - it works fine, no oscillation. I will try your solution as well as it seems a bit more elegant

Chuck is checking out two inexpensive Chinese board manufacturers now.? Very inexpensive and fast turn around time, so time will tell if the project goes that way or needs to be improved.? He

Yes.? Go to QRP-Tech on Yahoo Groups. ? There are a bunch of guys wanting to build a Norcal 40A that missed building one a few years ago.? A plain simple rig but updated with a keyer circuit.?

ability to hold the pads while heating at dam temperatures , - I wonder it depends on quality of copper clad and the micro thickness more than the quality of manufacture. Yes, you can say what qualty