I was gifted a complete set of kits for the Ultimate 3S, LP filters, relays, etc., and case that was shipped to my gifter in 2017. I see there are various series of boards and low pass filter

Hi Brad, I would suggest that you tell us what test equipment you have. I have found a digital oscilloscope is probably the most important. For component testing, I use a transistor tester. I start

Brad, Are you testing the BS170's in or out of circuit? They're all in parallel (I believe) and just 1 might have opened leading to lower power out. FETs aren't the easiest to test with an Ohmmeter.

It's expensive but a HAKKO FR301 solder removal tool is the best way I have found to remove solder either from a hole or for component removal. It also works great for removing the enamel from wire

I finally built my Hamvention acquired QDX for 9v. (12v initially, changed to 9v). It ran great putting out 4-5 w on all bands. 40-50 successful QSO's. I then decided to try it on 60m and got good

So I've built a U3S with one 20m LPF. Using on WSPR. Was never heard after a month of operation, yet verified it is transmitting from another radio in the shack. Decided to build and install the

I have several wall warts that I bought on Amazon for $10-$20. I searched 5.5mm 12V power supply. They range in value from 2.5A to 10A. Originally I purchased them for use with my Xiegu G90. I now

At RX, the draw seems to be just about 145 mA. At precisely 12.0V supply, here are the per-band TX current measurements, power out into 50 ohms nonreactive, and overall efficiency: 80M 740mA

Receivedmy package of QDX rev 3 by RFD postal on Saturday. Knew it was smallhowever, tiny I didn’t expect. Its about half the size of my X1MPro. Won’t be working on it anytime soon as its 94 plus

Tim I did exactly that with my build, left it as is making sure the turns didn't touch. The unit works fine as is. John KI3J

Good afternoon everyone, Hans, yes I have been transmitting since 01/06/2022, 24/24 h on the frequency of 144.4905 wspr with a Diamond X200 antenna. Unfortunately and I say unfortunately the

Very nice. I only got about half with my QDX but I was using essentially a quarter wave at ground level in an apartment complex. John KI3J

Esa, No. See https://groups.io/g/QRPLabs/message/74260 73 Alan G4ZFQ

Hello again It seems hard to find 74ACT08 in SO-14 (SOT108-1) in local shops. So could I try to use 74AC00 in SO-14 package? Is it correct footprint? 73 de oh2awg, Esa N

Hi Dave, Steve, W5RRX sent you the voltage readings. I have not measured the values on my rev 3 QDX. The reason for my post is that the best way I have found to test the switching between bands is to

Anyone set up or using an @QDX callgroup in JS8Call? I'm new to that program and wondering if that would work. Thanks! --Al WD4AH

One addition to my prior post: Do not run the QDX on the 13.8volts. I have a regulator going to the QDX to keep that supplied with 9volts.

Hi Bill, The short answer is yes, BUT the 50watt amp was not designed for the long transmit times that FT8/4 requires at full power. Hans has suggested keeping the output to 25 watts or less. For

My QDX v3 is built for 9V. 40 meters, FT8 "Tune" readings: Rx: 142 mA Tx: 954 mA Using readout from a Tekpower 300ST power supply.

BTW I'm running 9 VDC Dean