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Tom, Reheat T501. I had same problem. I don’t think that the QRP Labs scrapes any of the toroids wires and depends on the solder to dissolve the varnish. It took quite a while and higher

We had thirteen folks at the 19 December Michigan QRP Club weekly Zoom chat. Please join us Thursday 26 December (and every Thursday) at 4PM Eastern for the Michigan QRP Club weekly QRP Chat where the

Depending on the quality and brand of power supply and what happens when it sees a load of RF coming back down its cable that's definitely a potential issue . . (50 years experience has taught me

Just an idea: Maybe there are power-supplies that don't like HF and change (increase) their output-voltage.

What type of BUC did you use? imho you are not the first, who's QMX died using a converter. 73, Wolfgang

Hi Steve I added it to my list. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl [email protected]> wrote:

Using the same power supply (11.8v via BUC converter) and same antenna (Resonant 40m) that had been working for an hour, suddenly the unit quit putting out RF and when I put my hand on it it was very

You are obviously free to go and build what you want, but there is no practical difference on air between 3-4W and 10W. I would get on air and make a few dozen contacts in the time needed to get a 10W

Just a hunch...? The BS170s seem to? be the most sensitive, at least to power levels ... maybe heat too. Nothing like FT8 to generate heat. -- 72 de N4REE, Bob Easton - QRP CW forever

I run wsjtx and a raspi to my QDX and it started having similar problems. I found wspr would tx ok using my laptop but no longer on the raspi, just a brief transmission. Anyway, I found out that must

Hello Evan, many thanks for your hints. I measured the voltages at the parts you mentioned: Q4: Gate 7.29 V? (TX 7.34 V) Source 14.24 V (TX equal)? (I saw with a loupe that Drain is not connected

Thanks for that.?? Mike Krieger <Djwilcox01@...> wrote:

?Andy, Thank you for your vote of confidence. I retired in 2015 after 44 years of showing up for work (meaning family practice in northern Michigan). And someone even paid me for showing up. In

Hi Daniel, fully agree. The higher temperature requirement can be problematic. When I'm soldering connectors I also open my secret drawer with the remaining 60/40, to avoid melting structural

I would check the USB cable, I have come across cables with poor shielding, i.e. they catch/are affected by RF.

Hello Brien Powdered iron cores, nor ferrite ;-) But everything is here now, no more problems, and we are preparing all the pending orders that were waiting on T37-6 or sticky feet. I updated the

Has anyone recently received their QMX 60-15M kit order?? The last update, December 9th, on QRP Labs website said they were short ferrite cores which were expected December 13th.? No updates since

Dirk, agree, the Sn95,5Ag3,8Cu0,7 ( I use a Kester product) works well. However you do have to use higher heat. I have used the lead free for a lot of projects, but for the QMX I went back to 60/40 Pb

As of 2021 the US Army, at least, requires 3% minimum lead content in solder to prevent whisker formation. https://www.psmagazine.army.mil/News/Article/2567624/get-the-lead-outnot/

l think a lot of us missed out on the first group buy.? Would you (Cal and Stan) be willing to do another group buy if we can get 10 more folks to commit? -- Dale Hardin KS4NS Elberta, AL