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The QDX manual states; If you wish to use a supply of 12 - 13 V the 3:2 winding style is more suitable and will produce 4 – 5 W output for 12 – 13 V supply. I started with the 9v build and it gave

Hi Hans, I will not run my 12volt QDX on anything over 12volts.? The output MOSFETs are not the only thing that will generate heat in the enclosure.? The LM78m05 will also need to dissipate another

Check the manual for your power supplies.? Many of them can be adjusted via a small trimmer on the main board.

I built mine for 9V, since Hans suggested that was preferred. However, if you look at the power curves Hans supplied, it looks like power outputs at 9V (9V build) and 13.8V ('12'V build) are about the

Are you talking about these links? Steve Fabricant posted these in a previous post.

Hi Hans, I’m using a 13.8v supply and 3x 1N4001 diodes in series worked for me to drop the voltage. They get warm but not excessively so… Before using the diodes the QDX case did get quite warm

How tough would it have been for them to simply send some sort of knob that actually worked? Well knobs for polyvaricons are not common. Usually you use a long enough (and not too long) M2.5 machine

IIRC there were several mistakes in the diagrams and instructions. ?For me the biggest issue is that the knobs simply do not work with the polyvaricons...... ? and, I'm a handy guy, and experienced

Hi Hans! I hope all is well with QRPLabs! I just had a nutty idea I thought I'd share with you. Please ignore this if you think it's silly or a waste of time or if you've already thought of it... The

Another note of encouragement. If you take it slow, and like Hans' says triple check each connection, you can't go wrong. Like travel, half the fun is getting there. Good Luck! --Al WD4AH

Hi, My QDX is nearly finished, and I now realize that all powersupplies I own give out 13.6 volts. That's a whopping 1.6 volts more than advised. I did provide for extra cooling of the BS170s, and I

Besides, just following directions (when building a new kit) isn’t really teaching you anything. If it doesn’t work and with help from others on this connection you finally figure out what is

OK, here comes some truth: if I can do it, anyone can. Due to the rigors of my career path, I have carpal tunnel issues along with arthritis in both hands...let's just say that my soldering skills

Thanks for the tip,. Just ordered the FR301 I always wanted. They are expensive but absolutely great for desoldering. Which as I get older it seems I have to do more of….. grin. Also picked up their

Thumbs up! Gonna get me some of that. (I was pleasantly surprised when my KD1JV Tribander kit came with the slippery decals. ) JS6TMW

And do remember not to follow the instructions when installing the inductor in this tuner. That’s the key to success as it took me years to learn,

I previously tested this using the 10A setting on my multimeter as the uA/mA setting wasn't working.? I found that the low-current fuse was blown, replaced it, and retested using the lower current

Reminder: In JS8Call, please add the group @QDX

For my experiment, I used Windows 10 Voice recorder connected to the motherboard sound card, and WJST-X connected to a USB sound card (that 'was' connected to my HobbyPCB RS-HFIQ). MB Mic to USB Spkr

Thanks for verifying it! --Al