My freshly completed QCX+ 40m kit is alive and receives like a champ. I noticed my transmit frequency is like 15khz above the displayed freq. Transmitting on the displayed freq. of 7.020, I found my

David, A Hot Air SMD "Rework" gun is the way to go. And, can be a lot of fun. Don't be afraid to give it a try, you might find it as much fun as I do. :)

It was my understanding that he needs an X-ray view or track image of the synthesizer board, the one with the Si5351 on it, not the ProgRock board that it plugs into. If in fact his problem is on the

If you're going to be doing ANY SMD repair, definitely buy a Chip-Quik kit. It comes with liquid flux, which you apply before removing the IC, and before soldering on the new one. As the old IC is

Dusted off my QCX (last update 1.00f) and flashed 1.06. Had some errors on Win10 20H2 until I ran new arduino install as administrator then presto! Wow great firmware and great work!!! New fun with

I'm using a pair of Dollar Store Maxell over the ear headphones. They work well. -- 73, Dan - W2DLC

Agreed. Hot air rework station @$125 is the best investment for removing sm ICs. No clean flux and solder wick will do wonders for the pads to prep for the new part. Mike N0QBH

Dave When I started working with SMD I bought this from off Amazon.co.uk: MG Chemicals 8341 No Clean Flux Paste, 10 ml Pneumatic Dispenser (Complete with Plunger & Dispensing Tip) - I see it costs

I haven't used this low melting solder technique yet but know others who have and its brill, check out the Youtube videos for this.And yes the biggest problem by far is pcb damage if it does come

The main thing is to be kind to the PCB. The 'best' method here is to have a hot air surface mount rework station, but if you're asking about this, it's a virtual certainty that you don't have

Another way is to slide a piece of enamelled wire under the IC. Anchor one end and pull it out under each pin as you heat them. Don't worry about shorting pins when you refit, solder braid will clean

Hi, Dave. I had to replace fst3253 here. Technique I used is to desolder pins and lift one at a time down one side of ic. Then I flood other side of ic with solder and lift ic gently to remove. I

Hi Bob There's already an image of the tracks on page 5 of the operating manual. 73 Hans G0UPL http://qrp-labs.com

Hi Phil If you cut off the recommended pin for the situation where using the Si5351A Synth in an old U3 Board, then it would be no problem. If you cut off a different pin then it could be your

Hans, I am using the Si5351A and I believe that I cut off one pin. Would that be my problem? Phil PS The 3S software (3.12a) seems to be a lot faster, that is why I

Oooops Thanks Bill, for bringing this oversight to my attention. Too fast on the copy-and-paste. I have fixed it now see http://qrp-labs.com/qlg1 73 Hans G0UPL http://qrp-labs.com

Hi Bob I'm using Heil Sound Pro-set 3 https://heilsound.com/products/pro-set-3/ for the last year or so, which was a Homebrew Heroes award 2019 sponsor prize. I find them sensitive and comfortable and

Hi Phil No. V3.09f was the last firmware version that supported both the AD9850 DDS and the Si5351A synthesizer chip. After that, AD9850 DDS code was removed from the firmware to make space for other

Hi Dave You can connect to tip or ring, either is OK. If using a mono CW plug you can configure in the firmware so that either tip, ring or both are chosen as straight key input; this is because a

Dear Members, I have to replace IC4 FST3253 on my QCX+. I killed it by accident and so I am on the hook to replace it. I have a repair part and looking for a technique that someone has used