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Ignore that question as I now see the yellow trace IS the gate voltage (I had wrongly assumed it was the source). PeterO G0DZB

Is the lack of a DC reference on the drain of Q5 a possible cause ? Is the gate being properly driven when the problem occurs ? PeterO G0DZB

/ //Hi////Olgierd SQ3SWF // // //? Why is the "dah" only twice the duration of the "dit"? ? John, VK6JY needs to understand.// /

Sadly I've been unable to get a simple Yes/No answer to this from the RSGB. It seems it comes down to personal interpretations of what IR-2028 means. Some rather unhelpful advice I received was "If

Funny thing. As I'm looking for a suitable replacement for Q6, I decided to remove the transistor and short emiter with collector, providing 12V directly to BS170 drains. Obviously there's no envelope

Try standing the control off the PCB. Use a non-conducting spacer. 73 Alvey g4ksy

Hello William. Thank you for taking the time to reply and for the info. I have it running on the laptop now via the QLG1 via the CP2102 and I can also see data through my old BT77 Bluetooth device

Hi Glenn, thank you for a response. Another few trials of transmitting into a dummy load resulted in power dropping to less than 1Vpp.. and staying there. :-( I suspect MPS2907 is dead, voltage on

I completed, aligned and tested my unit and everything seemed fine.When I keyed it, the sidetone sounded clear and did not miss anything. On the air, the signal was clean and easy to copy, monitored

Hi, Once you've got the serial connection from the GPS to the computer, using a USB2TTL converter, or BlueTooth connection or just a USB GPS dongle, I've written a terminal program to read from the

Hello Pete. Have you got any form of device for transmitting on WSPR. The fabulous U3S is a brilliant kit to start with if you haven't. Or the QCX which i think you have said you are getting. Having

Hello Hans. Here is a screen capture from a SA of a 10 dbe the precis Mhz from a GPSDO and the measurment from the progrock (its SW ver 1.0) and the window for correction is 1. Is it what should bede

I use the AVR programmer sold by Atmel:

I use the AVR programmer from Atmel. Ihttp://www.robotshop.com/en/usb-avrisp-xpii-avr-programmer.html?gclid=CjwKCAjwmqHPBRBQEiwAOvbR85eS1k3RyevpFMi1QRLDuprB6BJAesCss8OI32GPAsGKpxmJEG4fnhoCrt8QAvD_BwE

I've always used either the USBasp or the USBtiny to use on the U3S. Unfortunately I managed to bugger one of my QCX IC's up using the USBasp but I'm pretty sure I was to blame for that as I was too

Greetings all; What is the programmer of choice used for upgrading the onboard IC? Please provide links. 73; Kurt - W2MW

Hi Lee. The stand-offs were not shortend .There is a 0.2 mm space between the LCD and the top. 73? John PD7MAA

John (PD7MAA), Did you use the plastic stand-offs in the kit, or, use your own stand-offs?? If you used those supplied in the kit, did you have to file anything off of them to fit in the aluminum

Trifilar ? It states in the appnote that a 25t inductor should be used. http://www.qrp-labs.com/images/appnotes/AN004_A4.pdf

Well done Ken. Good news and good dx! David G4YVM