Re: Another QMX+ got onto the air
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Nice build, Lex!? Lots of details?and great tips. I chuckled at the mindful toroid winding! I have added a link to your build process at the bottom of the QMX+ page along with a link to the RSGB video on QMX+, and Hannes DL9SCO's video on QMX+ construction.?
Hello all,
Today I finished my QMX+ and after some initial configuration / diagnostics I measured the output power by triggering in TX in the diagnostic screen.?
The power outputs where (for 9V):
160m - 5.75 W
80m - 5.00 W
60m - 4.47 ?W
40m - 4.47 W
30m - 4.57 W
20m - 3.09 W
17m - 2.57 W
15m - 2.88 W
12m - 2.14 W
11m - 3.24 W
10m - 2.95 W
6m - 2.09 W
As expected there is a roll off at the higher bands and as observed before by other builders a dip on the 17m band (compared to 20 and 15m).
The diagnostics showed nice curves on the LPF and audio filters. But the RF filters look a bit funky (not like the manual, so there is some work to be done there.?
But as this is for the RX part, I fired up WSjtX, monitored the 40 and 20m band for a while and? made a few FT8 QSO's on those bands for testing.?
Next steps will be taking a closer look at the RF filters, do some more RX with it, take a better look at all the configuration options (big thumbs up for the terminal interface for easy configuration).??
The build, which took me a few weeks instead of a few evenings to complete due to personal reasons,? I documented in a kind of blog style on my website: (still needs some text to be added and edited). Growing into be a grumpy old man,? I don't mind SMD, but? find it sad that there are less through hole components to be installed compared to the QCX+ ;-) ??
Hans, again you showed me that you make great hamradio kits which are a fun to build. I tip my hat for you.?
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73 Lex PH2LB?
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