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John - what would happen if I didn't bypass the onboard filter but instead went totally lazy and just plugged the filter kit into the earphone jack?

I guess that means you're not an Old Dog, but maybe a Mast-odon? :)

Looking at the schematic for the Si5351A VFO/SigGen kit, I was surprised to see that on the ATmega328 that PB1 (physical pin 15) is being used for SCL and PD2 (physical pin 4) is being used for SDA

If you haven't already, start working through Hans' QCX Troubleshooting guide from their website in the 'QCX area.' I think one of the first things to look for now that the 'smoke is out' is the

I am glad to hear that. Looks that the gap has widened though. and even outside the contests there are more stations even with not so special calls that are just throwing 5nn around instead of a true

There was something similar in the RSGB Handbook second edition. John F5VLF

I built one of those back around 2004 when we were establishing a wireless ISP in a small town. You need three 16' 2x4s and a couple of bolts. If you support next to a building rather than completely

I inadvertently dropped a 13.8V live wire onto the PCB of my QCX-40 and the smoke got out. Subsequently the voltages were all over the place so I ordered and completed a second rig yesterday. Removing

Maybe you should start an exclusive sub-group for owners of QCXs in home-made wooden cases. Call it a splinter group? Good work Brady, I wish I had your skill. John G4EDX QCX30 Nottingham, England

Hi Bill See http://www.qrp-labs.com/synth/si5351ademo.html 73 Hans G0UPL http://qrp-labs.com

I need some help with my QCX20 ver. 3.?It originally worked, receiving well but only 1.75 watts output.?I measured 5.1 watts at the drain on all BS170’s?I then reworked L1, L2 and L3 removing a

I am able to test with qcx.

Does anyone have or is anyone able to help me write a simple arduino sketch to turn on the QRP Labs Si5351A Synthesiser Module, PCB Rev 4? I just want to turn on clk0 for a period so I can test

Very nice indeed!

Hear hear! These guys are the best of the best. One of the big ingredients in being that good is the ability to copy CW by ear in adverse conditions far better than any machine or software can. They

*Found the problem. The 7805 regulator is flaky replace it and and I have transmit. Thank you guys for your input. low power prevented flash. Carl Thanks for your time and ideas. lAB1ZI *

Hay there James Yes the U3s works fine up to the start of transmitting then reboots Yes I can go through all the menus and set the correct info Yes different power supply same results Home made PSU

No sorry, these guys KNOW CW, and can copy it better than ANY computer program.? Especially in conditions with QRM. PERIOD! Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com

I had a look at the WRTC2018 competition and tried to work some of the HQ. Got 25 of them despite the pile ups. There was a video about the competition site showing the operation in a tent of one

The first U3 I built years ago I seem to remember having a similar problem. I was using a very small phone charger I seem to remember which caused all sorts of problems. Swapped it out with a linear