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QMX SWR measurement is not correct while using with PA
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
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QMX SSB in mobile?
3
I have a QMX coming soon and was wondering now that SSB is included, do you think the QMX would perform well in a mobile environment? Perhaps with a amplifier/tuner? TY! Jeff
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Hi, When running the various diagnostic sweeps I find all bands except 160m seem reasonable similarities to those shown in the manual. But the 160m seems way off. Any ideas what may be causing this and what I should be checking? I'll include screenshots of the sweeps. Many thanks Ian
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When Elecraft introduced the KH1 a year ago, I was immediately enthusiastic about the concept. A small and lightweight shortwave radio with an integrated telescopic antenna. This means that, weighing less than 400g, it can be used in any suitable location on shortwave. So I wanted to build something myself. I immediately began my own experiments with telescopic antennas for 7-30 MHz. This confirmed that a counterweight is absolutely necessary. This wire, which is a quarter of the wavelength long, contributes significantly to the radiated energy. So the idea arose to forgo the telescopic antenna and experiment with end-fed wires twice the length. Of course, it makes sense to stretch the wire as high as possible. But I also got respectable reports with EFHW lying on the ground or in bushes. In this place the antenna may detunes itself, so a tuner is necessary, as well as the standard 1:64 transformer (Unun). The tried-and-tested resonance circuit (Fuchs Kreis) performs both tasks. Once the antenna issue was resolved, QRP Labs brought out the QMX. The ideal TRX for my projects, and now even capable of SSB. Now all that was missing was a suitable housing with an integrated battery and a speaker with an amplifier. Then a paddle for CW as a contactless touch key directly on the device. And the QMX Carrot was finished. But it wasn¡¯t that simple, because everything had to be as small and light as possible. It now weighs 340g and measures 15x8.5x3.0 cm. I¡¯m happy with that. 73 Chris https://youtu.be/0kksiWVOtnQ
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fldigi with QMX+?
12
Ok ..I have tried fldigi on other radios - always gave up after too much trying to make it work. So trying one last time with QMX+. Is there a simple "HOW- TO" for getting to work ? I want to use it for RTTY mainly . So far no fun...?thanks
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WA3TFS with Ultimate relay-switched LPF kit
With the help of this group, I was to implement PTT-keying of my WA3TFS amplifier. Thanks to all who helped, that worked out very well. WA3TFS states that the 20M version can also be used on 30M and 17M. I have noted a significant power drop-off on 17M which I attribute to roll-off of the WA3TFS LPF and avoid that. Additionally, it would be nice if the amplifier was as band agile as my mid-band QMX. Then I saw the recent thread about the QRP Labs LPF relay board which got me to thinking about using that to make those improvements. The QRP Labs relay kit with band-specific filters for 40M (and 60M), 30M, 20M, 17M and 15M should improve the WA3TFS greatly. I plan to bypass the WA3TFS LPF and just use the five filters on the QRP-Labs relay board. Since the relays handle the amplified RF path and are activated using +5V, I was planning to use a band switch to activate the appropriate relay. I realize that this manual approach increases the risk of operator error and high SWR if the amplifier is not switched to match the QMX band. Has anyone done this with the WA3TFS amplifier or similar? I am a novice at this, so is there anything that I am overlooking in thinking that this would work (for example, impedance matching between WA3TFS PA and QRP Labs LPF)? -- 73, Jim - AE5JE
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QMX suddenly no power output, factory reset helped
Recently, I observed some strange QMX behaviour. I returned from SOTA, all was OK, and I stored QMX to the drawer. After some time I took it from the drawer and upgraded firmware to 1_02_000. I wanted to do SSB calibration, but I checked SWR first and I observed that SWR sweeps were very noisy and were varying from SWR 2.0 to cca. 10.0 even when on dummy load. LPF sweeps also showed some strange curves with 0 dB on the both min/max. I deduced there is no power output from the QMX and the diagnostic tools are reading only noise (IMHO it could show error message in such case). I validated with the external wattmeter that there is no power output from the QMX. I opened the case, finals were OK, filters connections also looked good. Firmware downgrade to 1_00_027 didn't help. Power off/on cycle and unplug from the power supply also didn't help. Finally, I tried factory reset and viola then it started to function normally and outputs power. Does anybody experience anything similar? This behavior was quite unexpected to me.
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QMX Alternate Bands
2
Has anyone tried 80-15? LPF0: 80m LPF1: 40m LPF2: 20m, 17m, 15m BPF0: 80m BPF1: 40m BPF2: 20m BPF3: 17m, 15m 73, Robert VE7ZN
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(Right: Gerald Youngblood, Flex Founder) They launched their new product "Aurora", 160-6m, 500W transceiver that uses polar modulation just like QMX Hans: "So they visited me to admire QMX and I visited them to admire Aurora" https://www.facebook.com/share/p/1Brw3LK9zY/ 73 DE muhsin TA1MHS
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RIT in N1MM
2
I still use TS 480 for the setup of N1MM. When I am in Run and press the up or down key the QMX + changes to RIT .- .030 but cannot be modified then. I have to exit from that on the QMX+. It would have been perfect, if the QMx+ would follow the RIT in run. any suggestions ? -- Martin DK3UW
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PSK31 with QMX + Digipan
16
Hi all, just some hints how to configure QMX and Digipan. QMX: - SSB Menue: Mic AGC ON; Input: USB; MIC Gain 50; Compression 0 USB Gain: Adjust for 50% power on idle PSK Signal. (I am using USB Gain 5) - VOX: ON - CESSB: ON Make sure your antenna SWR is ok. If "Protection" is on it might stop your TX. (Its not the fault of Digipan, hi) DIGIPAN: Set your Serial port (where QMX is connected), no RTS/DTR as we are using VOX. Soundcard: Type: "Computer soundcard"; Input/ Output: "digital interface QMX"; sample rate: 11025 Thats it. Ready to make first PSK contacts! Good DX and hope to work you in PSK. 73 Mat DF2OF
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How to enable transmit for winlink
7
Hi folks I have read most of the info on setting up with li k and the qmx...I seem to be able to control the radio and get a receive sig al shown in the vara waterfall. However, when I try to connect, you can see the pauses or bla k portio s on the waterfall, but the rig does not go I to tx mode. Appreciate hearing g what I might be missing. I have tried setting radio to flex and kenwood...same results Cheers Scott
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T507 Continuity across all legs
10
#qmx
#troubleshooting
Need a sanity check here: Just built and installed T507 and as I was checking continuity between A-A, B-B, etc. I noticed that every pin would show continuity between each other (A shorts to BCD, B shorts to ACD, etc). Looking at the traces in the instructions and my limited understanding of the schematic, this is nominal and all 4 wires should connect to ground either directly or indirectly. is that correct?
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How to enable the internal mic on QMX+ 1.00.02
2
There are three menu choices for enabling mic input, 1-ext mic on paddle jack, 2-internal sound card audio (digi modes) and 3-two tone test audio. How do I enable the internal mic on the front panel? I'm new to this, just built the radio yesterday, I apologize if I'm not following protocol here. THANKS! -- Larry N2AJX
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Lu7AA Tracking website question
I have a question about the LU7AA picoballoon tracking website. In both the first and second transmission there is a header listing for: Rgrid, Km, Az. In the first transmission I assume they relate to the reporter of that spot My confusion is what do they refer to in the 2nd transmission. I posted in the "picoballoon" website with no response. Is there a guide to LU7AA website by any chance? Thank you for any help Tom K1FQY
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QRPLabs kits Ultimate relay-switched LPF
3
Pleading ignorance, please tell me where to find how to use one of these things. What does it fit in what other device? Is tthis part of a WSPR beacon? -- 73 Karl KI4ZUQ
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CW offset & sidetone in 1_02_00 (QMX)
4
Installed the latest firmware. I prefer a lower sidetone, so tried setting both offset and sidetone freq to 600. Normally run 580Hz, but it looks like 600 is the minimum value. This does not seem to persist, when I go back into the menu, I see it has changed back to 700... On my QCXs I just set sidetone freq to 580 and all is good. Any ideas pls ?
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SSB Audio/Mic Issues
8
I built the K6ARK mic per the specs listed for the QMX/(tr)uSDX etc including using the recommended high sensitivity (-24db) electret condenser and the mic works fine when transmitting on my (tr)uSDX however when transmitting on the QMX I'm getting an unintelligible signal. I have ran the mic gain utility via terminal which shows the correct levels, however upon transmit on my factory assembled QMX I still can't seem to get satisfactory transmit audio. I've also tried a factory reset. Any ideas? TIA de W?YEM
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What Pc software for QMX
4
Hi what is the PC software that I need to use to get into the QMX settings etc. I can access on the QMX screen but I see other people's screen shots of a PC Version. Many thanks ? ?
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QMX+: low RX sensitifity @ 6m / 22 dB noise floor / 1500 Hz wistle
9
Hello, I recently build QMX+ and noticed a huge noise floor and wistling a 6 m. Therfore I measured sensitifity using a signal generator. Band [MHz] Sens [dBm]@Noise+10dB Noise [dB] 1,85 -100,0 0 3,65 -106,0 0 5,35 -107,0 6 7,07 -107,0 0 10,14 -110,0 2 14,23 -107,0 1 18,1 -103,0 4 21,04 -99,0 9 24,9 -97,0 7 28,1 -103,0 5 50,5 -79,0 20 Method: injection of signal Rx frequency + 1,1 kHz Mode: Digi Noise: signal detected by WSJT-X Sens: Noise floor + 10 dB Noise floor is increasing by frequency, but at 6 m wistling and digital noise make RX unusable. Output at 6m is about 2 W at 9V Vbat (12V Version) 1,5 kHz wistle starts at 20 m and is increasing by frequency Using wsjt-X i evalating waterfall diagram: (QMX+ at 50 Ohm) AVE:1, cumulative Noise [dB] : signal by WSJT-X signal in waterfall diagram AU QMX+ freq [Hz] freq [Hz] freq [Hz] freq [Hz] freq [Hz] freq [Hz] Frequency [MHz] Noise [db] Noisefloor 500 1000 1500 2000 2500 3000 1,84 0 0,2 0,2 0,2 0,8 0,2 0,2 0,2 3,57 0 0,3 0,3 0,3 0,7 0,3 0,3 0,3 5,3 1 0,5 0,5 0,5 1 0,5 0,5 0,5 7,04 5 0,8 0,8 0,8 1,1 0,8 0,8 0,8 10,1 1 0,5 0,5 0,5 0,5 0,5 0,5 0,5 14,1 1 0,5 0,5 1,3 2,8 2,1 0,5 1,5 18,1 5 0,8 1 1,8 2,3 2,1 1,1 2 21,1 7 1 1 2,1 2,6 2,1 1,1 2,1 24,9 7 1 1,2 2,7 2,8 2,7 1,3 2,5 28,1 7 1 1,2 2 1,5 1,5 1,2 2,2 50,3 22 1,8 2,5 3,8 4,2 3,9 2,8 3,8 At higher bands 1,5kHz signal is constant and independent from RX freuqency. At 6m additional audio signals are appearing. 6m RF Filter seems to be ok. Any suggestions to detect cause? vy 73 Michael (DF6TV)
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Image Name
Sat 8:39am
Sat 8:39am