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I use alcohol and a cheap Harbor Freight Ultrasonic cleaner.?? Awesome.

Certain solder described as containing "no-clean" flux will leave a residue that even alcohol pads won't touch,? I made the error of purchasing a pound of Kester 63/37 with a non-rosin flux:

Hi Wei, good news. That gives me hope that I will find a suitable one. I think I need to order more and try them out. Yes, that's definitely the case with the eyes.

Use the search bar and type in the value of the capacitor. Then skinny down using the filters on the search results especially the form factor that Hans supplies in his detailed parts lists. For

More sources of transverters and ancillary items: https://www.downeastmicrowave.com/category-s/1513.htm I have worked with the founder and current owner, both great hams. Transverter? manufacturing

Have a look at Paul Wade W1GHZ's site, here is a link to the Transverters page: https://www.w1ghz.org/xvtr/transverter.htm Paul is a former MSC co-worker and technically and practically very astute

Hi Stefan, Not on a QMX, but on a U3, I had swapped standard 1602 with a mini 1602, it worked fine. I believe as long as it says 1602, they are compatible. But smaller size may put some stress on

Has anyone used a KX3 with the QRP Labs 59 watt amp? ?If so, how did you do it?

Bill, are you talking about a leaded 180pf capacitor, I assume? If so, I ordered this part recently for a modified QDX build: https://www.mouser.com/ProductDetail/594-K181J15C0GF5TL2 Hans talked

A new chat has been created: Just finished my 2nd QMX and made first QSOs I guess it's not normal, that they have such a different current consuption would you advice to exchange the BS170 in the

Thanks, Greg.? I had already visited both sites and found their search systems designed for PhD EE types, not a hobbyist like me ! If you or anyone reading this has a direct like to a supplier of

HB9BAB@... added the photo album HB9BAB ( /g/QRPLabs/album?id=297778 ) : QMX

I use "acid brushes" with the bristles cut down to about half length to scrub the board while it is wet with solvent.? Saves time and effort when removing flux residue. 73, Don N2VGU

Thanks for all info, I appreciate that, and I will try to replace the si5351. 73 Alf, la1zm

There's an article in the wiki outlining a series of tests on the SMPS modules independently of the main board, it might help to isolate the problems. /g/QRPLabs/wiki/37128 Or remove

I too had a problem with output fluctuation. I found that with a 9V supply the problem went away. I must have made a mistake when wrapping the T501.

Has anyone ever tried to install a smaller LCD display in a qmx. Is there any experience with this? Which one can i use? like this one https://a.aliexpress.com/_Ew3iRHL 73' de dl9tx

The cleaning process will direct your attention to each area, kind of like hand-washing your car will allow you to find those little dings and scratches you would never have noticed if using the car

A scalpel blade, specifically a #15 blade, applied with a rocking motion adjacent to the IC body, will slice cleanly through the leads without putting undue stress on the PCB lands. Then merely

I took Jeff Moore's advice and bought a pint of 99% isopropyl alcohol from Amazon ( about $9).Much better than even 91%.? A little goes a long way. Really cleans quick and leaves little or no smeary