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Hello! I've noticed that SWR protection stops TX when I try to use QMX with one of my PA. When I measure SWR with connected PA threw QMX hardware test it shows 1.8-1.9. And it causes SWR protection actuation (even if SWR protection level is 3 or 4 by the way...). When I do SWR measurement with Nano VNA or another transceiver they measure SWR = 1.1. So it looks like QMX is incorrect. That is strange... When I do not use PA then QMX SWR measurement tool provides correct figures (compared with Nano VNA). Any ideas? BR/Sergey UB3AZK

Hi, my QCX has been modified for a passband of around 900Hz and has found more use after the modification. I have a half-built QMX+ and the specs say that cw filter is adjustable from 50-500Hz. Many seasoned cw operators prefer much wider bandwidths for general cw working. I usually listen with around 1,2kHz BW, in tougher conditions the narrower BWs are a blessing. As my QMX+ still awaits to get on the air I want to ask if it?s possible to make the bandwith wider tha 500Hz in CW mode? If that is not the case, I would like to add this to the list of changes in the software of the QMX. 72 Ari OH9VL G-QRP 2068

I have been running firmware 1_02_000 on my QMX+ with good results on CW and SSB (haven't tried Digi yet) since the release of that firmware. So yesterday, I updated my original QMX with 1_02. The update went fine, and operation on CW was great, but I can't get all the SSB calibration procedures to look right. This is an 80, 60, 40, 30, 20 QMX, built for 12v (same voltage as my QMX+). The cals failed to complete on 80, 60, and 30. On 80 and 30, I get an error message saying "Change over 30 degrees" from the phase error cal and it stops at about dac=~1100 to 1300. I got a similar error on 60m, but this cal ran successfully on 3 subsequent runs. On the USB IMD sync, the final table in the upper right says 80m:15, 60m:74, 40m:23, 30m:62, 20m:26. In addition, 80m and 40m responses were almost flat - 80m ~140, 40m~100. On the LSB IMD sync, the final table in the upper right says 80m:74, 60m:74, 40m:29, 30m:15, 20m:26. In addition, 40m and 30m were almost flat - 40m ~280, 20m ~ 250. Also, for whatever reason, the y-axis max on 80m was ~7000000, and the y-axis max on 60m was ~1000000, both 1000 times higher than all other bands. On the ADC I/Q tests, the curves looked about the right shape (compared to samples in the oper. manual), but the upper left and lower left numbers were not very symmetrical. 80m 42183/-42067 60m 52338/-52457 40m 55808/-56412 30m 53881/-54284 20m 36459/-35947 Mic test works fine. PA Mod test looks good. Diagnostics look good on all bands with the following RF outputs. 80m 4.0w 60m 4.3w 40m 4.4w 30m 3.7w 20m 5.4w All tests with dummy load with Diagnostics showing SWR around 1.1:1 Any comments or suggestions are welcome. 73, Randy, KS4L

I just upgraded to the 027 firmware on my QMX, from 018. Being able to select the CW filter is very nice, but I don't understand how to enable cascading or compounding of two CW filters. The manual says there are two CW filters - 300 and 500 Hz, yet the submenu shows 8 filters, ranging from 50 Hz to 500 Hz. Thanks and 73, Steve, N2IC

Hello dear all and devs, Several hams on our side have equipped themselves with the QMX+. Some would like to know if it would be possible to add a few lines of code to the firmware so that when PTT is triggered—either via CAT or through DTR/RTS emulation—and the QMX+ is in CW mode, it would transmit a carrier. From our tests, this already works in Digi mode, where a tone is sent through the sound card emulation. However, in CW mode, when PTT is sent via CAT, the radio does switch to transmit, but no signal is actually emitted. It might work if the software sent a tone via the sound card, but most CW software assumes that PTT alone is sufficient. This request is therefore aligned with improving compatibility with most CW-capable software (e.g., fldigi in CW mode with PTT via CAT or RTS/DTR). One of the advantages of operating in CW with the QMX+ is also the ability to reduce receive bandwidth, onboard decoding, breakin etc. We believe only a small firmware adjustment would be needed to have the carrier generated automatically, since the radio already enters transmit mode via CAT PTT. Adding RTS/DTR handling would enable a simple and widespread configuration method for this kind of operation. Otherwise, some have considered building interfaces using FT232 chips and optocouplers, but it would be unfortunate to require extra hardware when just a few lines of code might suffice. Perhaps the addition of a CW submenu to automatically enable the carrier when PTT is activated? Thank you in advance.

I received my 20m-10m QMX kit and am currently assembling it. Unfortunately, the kit I received was missing the three 33pF and the 100pF capacitors (C401, C404, C521, C516). It will probably take a while until I receive the missing parts and I wonder if it is still possible to finish the build and start testing the device (basic tests like: will it turn on etc). Or should I just let it sit and wait? 73, Dennis DM4NTZ

Hi guys, I recently installed the new fw 1_02_00 on my QMX+. However, after listening on various frequencies I noticed that there are very strong and unwanted signals at the beginning of the band. In 20m it receives an S8 signal around 14,012.00 Khz and the same in 15 and 10m even without an antenna. I wanted to know if you also had the same problem. A friend of mine who uses the FW 1_01_003 beta let me know that with this version the problem exists but the unwanted signals are much more attenuated. 73 de IZ2BHP.

Hi guys, I recently installed the new fw 1_02_00 on my QMX+. However, after listening on various frequencies I noticed that there are very strong and unwanted signals at the beginning of the band. In 20m it receives an S8 carrier signal around 14,012.00 Khz and the same in 15 and 10, even without an antenna. I wanted to know if you also had the same problem. A friend of mine who uses the beta FW 1_01_003 let me know that with this version the problem exists but the unwanted signals are much more attenuated. Thanks for your reply. 73 de IZ2BHP.

I would like to block Digi mode audio from going to the earphone jack. The audio levels are painfully loud when adjusted for correct usb output to WSJT-X. I am afraid to switch between sidebands or to CW without removing headphones first. Any Suggestions ? QMX+ with 1.02 . de VK6XT

Hi, I wanted to tune my magloop antenna with the "Tune SWR" tool in the QMX+ menus, and no matter what I do with the antenna, the SWR never goes above 1.04 or so. That cannot be correct, as I'm using a magloop. Any tips on what I'm doing wrong?

The price of success! My Factory built QMX hiband can be in your hands in a week or so. 12- volt build, enclosure, .027 installed. Works perfectly. Email sfab43@ho**ail.com for more info. Steve JS6TMW/AI6KX

My QMX+ was working but when I powered it on this morning the display backlight is not on and the display shows a row of black blocks. Does anyone have any thoughts on where to start troubleshooting. +V or +12v has 12v, VCC has 5.1v, and VDD has 3.3v. I have had some issues with this unit. The 78M33 failed. When I tried to remove it the two small pads lifted. I currently have the 3.3v being supplied by a small DROC 3.3v buck converter. It was working well as of yesterday, I completed several FT8 and SSB QSOs.

Hi Everyone I was wondering if is possible to assemble only one band filter at the time on a qmx plux rev3, this means I have assembled the all QMX leaving out only the toroids of all the filters, the LP and BP ones. Now next I have assembled only the 160m LP and BP and test the filters. The swipes look normal on the 160m. Next is to test transiting to a dummy load only this band, but I get the swr protection kicking in and no power out. voltages look normal. running a swr plot on 160m shows swr 10 on all graph. The main idea is to tune filters one by one with space for the soldering iron making it easy. I have reviewed soldering of transformer and swr brigde plus the jumper to the bnc is in place. My question is, Is it expectable that the SWR is High when only the filters for one band are on the board or this means something else is already wrong from the beginning. Thank you a lot 73 Azgael

Hi all I have a qmx plus and I ran 13.6 volts into it on a first time power up it worked for abt 5 min then it shut dow. Then i read about the max of 12v vcc. I am assuming that I lost the buck converter. I have replaced all the sbject transitors that showed bad via the ohm meter still no joy. does anyone of you smart ones have test point diagram fot the buck converter so i can trace it and trouble shoot . thanks you a bunch Joe

To Da Wiz; thank you, and a request, to make it better. Personally, I would appreciate the choice to use AGC, with my QMX+, or not, for all modes. I have used fast or slow AGC with my FT-990 and TS-790A for years, for different modes, and have found no noticeable performance penalty, except that the sound from no AGC was harsh and undesirable, and the S meter unusable. Some folks will not RTFMs to turn off the AGC, or properly tweak other software or hardware, and complain about imagined "bugs" - but for this ol' geezer, the choice would be appreciated, and I promise I will not whine about the consequences ;-) Thanks for a hearing, DA Ol' Dog, wa4hei