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Digikey or Mouser are good sources. Shipping and handling will likely be more than the parts you buy, but stocking up on regular spares, general kit building supplies and such at the same time that

A soldering station with hot air is affordable and worth having.? ?I use YIHUA 8786D

Hi all, I’m interested in using a QMX with transverters for 4 meters/ 2 meters and 70 cms. But there seems to be a lack of modern DIY kits or designs for them. Any suggestions? My FT817 has

Your comments are greatly appreciated!!!! 72 Luis <va3cjo@...> escribió:

Due to damage I caused (small crack)? I need to replace the 180pf cap in my QMX + build. Can anyone please link a reliable source where I can purchase one and a few spares? The Shop doesn't list

p.s. to my prior post: oops, my QMX is built for 9V, so 125mA at 9V is about the same as 90mV at 12V from the prior posts.? So you do have a higher than normal idle current draw. But since you are

'Flux rarely causes a problem during the warranty period - especially the no-clean stuff' But years-on in certain circumstances of temperature and humidity it can become a problem for RF and power

I wouldn't assume you have a problem in the BS170s. My newly built QMX mini draws 125mA on idle/receive, and all diagnostic tests work correctly, and it seems to receive and transmit correctly.?

Others already pointed you to the right adaptors. I'll add that I often use iFTx with an iPhone and it works well, with a caveat: Apple places artificial limitations on the iPhone and it won't do CAT

Isopropyl alcohol works well and I prefer brands containing 99%. I use cotton swabs soaked in alcohol to clean around pads. The wet end does the cleaning and then I use the dry end to wipe up the

Also, as I understand it, simple rubbing alcohol suffices as flux-cleaner, so it's not a big deal. I've been using alcohol-wipe pads I had on hand (being careful not to leave behind fibers from the

Roy, thank you. That fits, so far, with what people seem to describe as part of the cluster of issues around the BS170s. Honestly, even if the BS170s turn out not to be the problem, starting with them

FT8cn is even more frustrating [email protected]> escribió:

It’s not absolutely necessary to remove flux but I be always do for two reasons. First, long term, flux could affect the performance of high-impedance points, most notably at RF frequencies. Second,

I am going to start building a QMX+. I was wondering if removing flux with a chemical is necessary? ?In all the builds I have done before I never bothered to try to remove the flux after finishing.

Just be aware that iFTX (at least as of 4 to 5 months ago) does not work quite like the FT8 developers designed WSJT. You may like it, I found it frustrating operationally. 73, Kevin K3OX

Hi Bill, The original post had a PDF attachment describing the experiment. I am re-attaching the original PDF to this post. Max-heatsink refers to the original post where the transistors were wrapped

Tony, Can you explain the meaning of these numbers? Does a lower number mean the hardware is better able to dissipate heat or simply has more thermal mass for the active device to heat? Any idea

Alf, Not much required to do the Si5351 https://sites.google.com/site/g4zfqradio/qrplabs_replace_si5351 Others have cut the IC pins with a Dremel-type tool or even with a scalpel. It is worth trying

Hi The si5351 is the faulty unit, tcxo is ok all the time, but Lo disappear when the fault occurs. By cooling down the si5351 it is ok again. This smd is too small for me to replace, I have no tools