开云体育

Tisha AA4HA, The QDX was my first introduction to use a bolt and a washer for heat transfer. It was so foreign that I just stared at the picture in wonder of what the heck it was! I really like your

A winkeyer will do what you want, allowing your computer or your paddle as the input to the key jack; but that’s another piece of hardware. Steve W6WU

Jonathan, I plan on attempting this myself over the next 6-8 weeks. I have a HB QDX kit to use as a base, and additional toroids and capacitors.? I'm hoping to get 40, 30, 20 and 15M, and if I'm

Hi Marek, Thanks for the hints, I'll check up if there's RF signal in the places that you suggested. Answering your questions: I've built 12V version (but testing at 8-12V), did factory reset

Dear Hans, how about an option for bi-directional band change using the left side rotary encoder? 1. Double tap the left encoder button 2. The “frequency change” cursor appears under the Mhz

Hi Damian, Long shot, reinstall firmware, but this is a very long shot. Looking at the schematic, I think you could first try to veryfiy if there is any RF signal comming out. Junction between C510

UK to New Zealand is the longest possible path to land from here. ? Repeat it most days on ?a QCX+5W

Roy, Ludwig, If the fault is on the gate driver side, the excess current will be via the 5V SMPS. At the 12V feed it will appear less because of the SMPS transformation. Much more than 60mW could be

Good morning all, just want to give a month-overdue shoutout to Jeff Moore, to add to the accolades he already has here. After experimenting with JS8Call with my QMX, and finding out that a 2.5

Thank you.? The kit is on order but I have been curious. Still interested in making a mid band version.

One thing more. Because the PA is on in some way also in RX mode, please connect the dummy load the whole time. It's only as a precaution.

Roy, please check also the voltage at each connection of T501 in RX mode and let me know. Reference to the transformer document at page 10 all the connections marked "P" should be on the same value

Roy, Check the gate signals at the BS170 PA transistors. You should see zero volts in RX, and a 5V 50% duty cycle RF square wave in TX. If you are using a DMM to measure, that TX signal will

You can also use the Factory Reset option to reset to the default settings if you have the jumper installed for high-band operation. 73 Evan AC9TU

Hi Jonathan, Here you go: Note that it is for the latest firmware, 1_10.? I suggest upgrading if you have not done so already. 73 Evan AC9TU

Would someone with a High Band version of the QDX be able to provide to me a screen shot for the Band Configuration screen similar to the low band screen here: Thanks!

Hi gals and guys! It's my fist message on this forum, so please let me that Hans is doing a great job with QRP Labs with his fantastic products (QCX-mini, QDX and QMX to name just a few). Recently

Hi Mike, Thank you for the tip.? I will try it in a day to two. Richard

A big factor in thermal failure of the BS170 in any of the QRPLabs kits is that the TO-92 package is not very efficient at transferring heat away from the die. The tinned pad, the washer and the