OK Hans. It goes south at 10 wpm normal CW. Sorry about the caps lock. I'll see what happens with your IRF 510 when the new amps come in. I'm building an amp for 40 and with your supplied IRF510.

Hi George Firstly, I think you may have an RF grounding or SWR problem, RF appears to be getting into your keyboard and causing the Shift key to be permanently operated, giving the effect as though

Nothing has time to get too hot. I am running the QCX on 12 V 7812 as suggested but it still is 4 watts out. Is overdriving a possibility?

Are the transistors getting hot? Are they the same temperature as the heatsink? Is the dummy load getting hot?

Howdy all, I'm building my second clock kit (with GPS) and mounting it in a custom box. I need to mount the buttons remotely so I don't have to open the box any time I want to make an adjustment. I'm

Dave, I tried to switch it with practice mode on and off. No difference. I think the issue is way before the output areas. My voltages are off all over the board, as noted above. I can't even trust

THIS IS THE SECOND SET. YOUR TECHNIQUE WAS AMAZING. ALL REPLACED IN TEN MINUTES. BUT UNFORTUNATELY EXACTLY SAME RESULT.

QRP LAB DUMMY LOAD. 18.8 VOLTS. 2.66 AMPS. DECLINES STARTS IN 3 SECONDS KEY DOWN AND THEN IS RAPID.

Hi Daniel Thanks, yes, it is going very well... around 60-70% of customers are choosing the FedEx option, and are consistently reporting the 3-4 days shipment time stated by FedEx/TNT. 73 Hans

My parcel was shipped on March 2 and arrived me on March 6 with FedEx Express. Incredibly fast. Daniel Ungureanu 73 Y08SAK

Thanks Hans, am thinking an idea for my ARC. Will Mi0wwb

Hi Will See http://qrp-labs.com/flights/u4b2 This is the 2nd test flight for the QRP Labs U4B balloon tracker. It is not yet commercially available. The balloons are from China via AliExpress, they

Sounds a really fun and educational project. What retail supplier do you use to purchase the balloon and radio kits from? Will de Mi0wwb

The U4B-2 is still going strong, and above the Ukrainian-Russian border as of now. Received with very modest 20m endfed wire a few meters above ground and lots of RF noise :-/ 73, Patrick ON4CDJ

Hi Alison, Great to find some one with knowledges and expertises in EER SSB and willing to help all novices, I wouldn’t dare to disturb Guido, he is a busy man, for an entry level query how to

hi Peter. absolutely right. I made an additional duplicate button for pressing the encoder, and removed the brake from the encoder.

OK Whats the SWR? What was the actual key down voltage? What was the Key down current? Allison ------------------------------- Please reply on list so we can share. No direct email, it goes to bit

Allison, Hans, All, The finals quit. Here's what happened. I got 30 Watts out on twenty. 20 volts and 2.4 amps on the supply. There were good sending CQ for a few minutes. Then I noticed as the key

But at best 8-10 bits of precision so dynamic range plus processing speed are hard limits. That presents a significant limit to RX performance. ITs purpose in life is not to do SDR RX for the moment.

Allison, That would be a good thing for the QCX main frame users. His 20db Well, with the QCX phase-shift you can get about 40dB rx side-band rejection in the 200-1200 Hz range, but higher up it will