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Hi Wayne. And was the failure also on 40? That sounds like there is something intermittent maybe, on your 40m antenna. So the SWR will also be fluctuating...not good! Roger 8P6RX

Hey, all. First--I have been having a great time with my QDX. I've made numerous FT8 and JS8 contacts. I've even worked with other FSK modes with this little transmitter. I built mine for 9VDC input

And Richard, to your question: If you dial a frequency bellow 3.3 kHz or over 570 MHz you get an "E" symbol on the LCD. 73 Bojan S53DZ

Hi, my experience with the QRP Labs VFO/SigGen is different. The chip is M5351A. It works well from 3.3 kHz to 310 MHz. Since it gives out a square wave signal we can not easily see the power

I bought one of the ATU10 tuners. I was a little underwhelmed at first, but later firmware releases made it an excellent portable tuner. Darn close to the Elecraft tuner, IMHO.

It's a great part, other than the fact that it cost $12.80 for a tray of 1000, (About $20 per part in smaller quantities), is a single sourced part with no replacements if it becomes unavailable, and

As an update I think I've found the issue. Replaced the screen, no change, replaced the ocxo with a bog standard si5351 synth board, still not working but I have garbage on the screen, so progress but

20% is a typical tolerance and if you have an inductance meter it’s better to go back to the theory calculated inductance values and check them as you wind (That said it’s common to see ‘off

Hi Jonathan, Kees These plots supplied by Jonathan look completely normal to me. The 3.3V rail experiences some disturbances during the boot-up process and this is completely normal; it is powered

Hello Stephan Yes but... 1. What about the eye-watering price? There are two versions in stock at Digikey, LTM8078IY and LTM8078EY. The price at 520-quantity (1 tray) is $11.52 and $10.47 resp.

Dear all, many posts discuss issues with the QMX build (shorts and holy smoke) and as reader one may get the impression this is normal. Well, I just want to share a successful build story. It

Thank you Hans I’ll use the 20-10 instructions and component values given in the latest version assembly manuals then, and update the firmware to the latest version. Sorry to take up your time

When previously using iron-powder toroids I've always had close correlation between measured inductance values and those obtained from the published tables and on-line calculators. So when doing some

Leland! I noticed you corrected Billy (N5SE) on his grammar/spelling. You might want to run your own posts through the same quality control.? ? Just jesting..... To which rig are you

After doing some rework on T2 my QDX it only shows 80M in the band config, the other bands do not appear at all. Normally there would be 80,60,40,30,20 with a whole set of options for each but I only

370 kOhm as in kilo-ohm? That's the opposite of a short. Installed in the circuit, there is about 10k of resistance between the primary and secondary windings of T501 because the primary is connected

A thermal camera is hands down the best way to identify a shorted component. Turn on the power and look for the thing that glows. You can get one that attaches to your phone for about $2-300. A

Well, pulled the finals and still draws 700mA when the left encoder is pushed. It stays there until I kill the power to it. No display backlight. Other things to check? I hate to pull the driver chip

I think that given all of the people experiencing blown components due to power supply issues (including myself), there is a case to be made for a redesign of the power supply. Something like an

Jeffrey, I'll take your word for it. I've blown the finals on the QDX and it was just low power out. I guess the QMX is different. That sure is an easier fix than some other things. I'll just pull