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Guys, As a post holiday project, I made a universal VXO. https://mp.weixin./s/LJqMDx24zOjHob3aERev-A Thanks, Adam

Guys, I made another simple project, a regenerative receiver to cover 7-16 MHz. The specialty of this circuit is that a readily available shielded coil is used. The original is FCZ series, while my

Steve, A local ham also encountered a similar problem. It does light on when the radio is powered on, although the LED is reversed. The explanation could be something like RF signal

Guys, It is a traditional holiday Mid Autumn Festival, or Moon Cake Festival. I made a small project based on the book of JF1RNR, whom I met in person in Japan Ham

Folks, There is a thread in an EFHW antenna Facebook group talking about our Mini Wire Antenna. K1RF Steve pointed out one thing that 2T:14T might not be good for a small size toroid, and it is

Well that doesn’t explain the green light coming on during transmit.

Steve, Apparently your green LED is polarity reversed. Thanks, Adam

Steve,? I saw your good soldering at a? glance.? But usually this view deceived us. Check everything again. Strange. I recommend check out voltages during this status. Then you will find out

Anyone have any ideas? Thinking I need to start by testing the transistors and work out from there.

Hi Adam, Here you go:

Steve, Please show me close look pictures of both sides. Thanks, Adam

Hi, I've built the 20m version of the D4D kit and when I connect it both lights come on then both lights go off after 1 second.? Plugging into a computer I get received signals that are properly

Thank you!

Hi LU7DID, If you really need to work at 5V, it is recommended to replace 78L05 by a LDO type 5V regulator. For the TX amplifier, the output can be as low as 100-200mW if you power with 5V. You can

Adam, In a bare bones emergency situation to which extend the D4D works with a high capacity 5V pack as it's sole power supply? (assume connectors worked out properly). ?Does the D4D work with less

My solution is a dual output (12 and 5V) Li-Ion battery pack similar size of D4D. Let me know if you guys are interested as it needs special shipping. The freight is higher. Thanks, Adam

I just picked up a 12 volt lithium ion battery pack from Amazon it is rated at 12 volt 11000 mAh. The size is just a little bit bigger then the D4D. The battery comes with charger connecting cables.

What’s a good battery system to run a RasPi4B and CRKits D4D? Bret/N4SRN

Hi Adam, I did the C5 105 addition in my build. Fortunately the IMD isn't too strong and WSJT-X can decode within 100 of the signals.I got my st QSO at 1235km on CQafter dark here - I'll spread the

Thanks for sharing your experience. Considering the small size and low power consumption, field operations with raspberry pi is recommended. Autumn is coming and let’s go outside! Thanks, Adam