开云体育

Gotta replace the PAs. To socket them, good or bad? See numrous sockets on ebay and online, but which to order, oh me oh my, what spacing or whatever. What do you say? -- 73 ChuckR

It has been a while since I've used my Ultimate 3S for WSPR and it has worked flawlessly in the past. However now, no signal seems to be transmitting and the oscillator calibration with GPS keeps increasing the frequency constantly. It is now up to 27,011,491 and climbing. This can't be right. Any ideas of what the problem may be?

It’s May, 2025! Time to take your Qrp-lab equipment outside and enjoy the coming summer, assuming you are in the northern hemisphere. If southern hemisphere, then get that last fling in before bad weather sets in.

Hi everyone, I recently completed building my QMX kit and it seemed to go well on the surface. The unit powers on just fine, the display works, menus respond, and voltages on the 3.3V and 5V SMPS look normal. However, I'm getting no power output on any band, and I haven't heard any received signals either (just noise). Here's what the diagnostics look like: I've verified all diode orientations match the silkscreen and build guide, and I've done my best to verify good continuity on the pads for all of the toroids. Maybe there's a bad solder joint somewhere less obvious. Does anyone have advice on where to look next or more checks you’d recommend to further narrow this down? Any help would be much appreciated! Thanks, Joe

Hello, I am getting ready to build my QMX and want to do so in the 9v configuration. Question is the manual says it runs at 9v or "a little over", so the question is. Will the radio be happy and safe to operate with a Bioenno 9v battery. Their website says the battery is regulated to discharge "around 9.6v" Anyone have any experience with using this configuration of Bioenno 9v and the QMX? If so how is it working for you? Thank and 73's W7YWF. (Mike)

On 4/29/25 I had a CW practice / rag chew session on 17 meters. I worked four stations: Conditions were OK with some QSB. SSN = 134, SFI = 154, A = 4, K = 1. My next CW practice session will be May 06 at 0900 EDT / 13:00 UTC on 20 meters. Anyone and everyone is welcome. This practice is intended for operators who are new to CW or they need some practice. IT DOES NOT MATTER HOW POOR YOUR CW IS. Mistakes are OK. Poor fists are OK. Slow speed is OK. Really slow speed is OK. This practice is meant for you to improve your CW. I will do my best to adjust to your skill level. Operate at any power level. If several stations show up, I will operate as a round-table control station. I will do it as a round-table so everyone gets a chance to transmit. Please listen to my directions. Details: Date - May 06 2025 Time - 0900 EDT / 13:00 UTC Band - 20 meters How to find me - I will find a clear frequency and call CQ. Go to the Reverse Beacon Network and search for my call sign AB8DF. That will tell you what frequency I am on. Tune your station to that frequency and if you hear me give me a call. If there is a QSO in progress, please wait for a break in the action. Then send your callsign. If I hear you, I will invite you to join the QSO and start a round-table QSO. Reply to this email if you have questions. IT DOES NOT MATTER HOW POOR CW IS Ed AB8DF

I have an odd situation here with my 12V QMX+. I could transmit normally on all bands with a 9V power supply. But at 12V when I transmitted on 12m (24.910 MHz) the current draw was quite a bit higher than on the other bands. My power supply's current limit was set at 1.0A and it hit that. All other bands drew less than an amp. After transmitting at that frequency the receive current had jumped to 300 mA (previously about 100 mA) and all the other bands transmitted about half the output power they had before. I replaced the finals and it happened again. Transmitting on 12m at 12V caused a failure in the finals. (Possibly Q507 as well. I get no RF output at all on any band now.) Any ideas on what might cause that one band to zap the finals? I've looked over its lowpass filter and don't see any visible shorts, and the inductors have the correct cores and number of turns. I was able to transmit on 10m before trying 12m and it seemed to work, although with less power out than the other bands.

Just wanted to share my 20V power supply solution that I made that works well for me. The upfront cost was $138 + tax, which includes a charger and a 96Wh portable Li-ion battery. Key features: ? Air travel approved (under 100WAh) ? Shock protected ? Uses 18650 Samsung cells ? Easy to charge ? Built-in charge display ? More compact than LiFePO? ? Weighs only 680g ? Dual purpose if you have other HF power tools. ? Comes with a 3-year warranty! A few photos: A shopping list:

After initial hickups after assembly, i deployed my QMX+ as base/main rig. 3 months have passed making QSOs with it and the following is the statistic, all FT8 Worked QSO: 1004 Worked DXCC: 86 CQ Zones: 20 ITU Zones:27 Continents:5 Longest contact: Fiji 16231km Other than that i made contacts with few Australia 15400km and New Caledonia 15900km away from my QTH All results on 20M with 3.2W and under the roof dipole. Overall very happy with how this rig performs, nothing can beat the price range vs performance it provides. Bad weather here is over, time to deploy some new antennas for this bad boy, and improve the statistics :)

The QMX Rev. 1 that I had assembled some time ago recently stopped working after making many CW and SSB contacts with the beta SSB firmware. By-the-way, the calibration went nicely. No issues there. It would turn on with no display but wouldn't turn off. Certain the CPU was dead, I was contemplating chucking it in the spare parts box and just continuing on with my QMX+. However, I decided to send it to Jeff to see if he could salvage it, and I'm glad I did. Jeff discovered the CPU wasn't dead and was able to get it working again in perfect order. His turnaround time and explanation of findings was great. If your QMX goes down I highly recommend Jeff to get it working great again. If it's beyond your repair capability, he's got the experience, tools, test equipment, parts and talent to make it happen. Thanks again Jeff. 72, Randy NR5N

Hi all, I completed my QMX build, and it won't power on. I took my time and was very meticulous. Or so I thought. When I power it on with the left encoder, nothing happens but I notice that IC101 gets slowly warm then hot if I don't pull the power. I can have the power connected but IC101 doesn't get warm until I press the left encoder. I can also connect it to my laptop and see it, but I don't dare leave the power connected for long. Has anyone seen this or have recommendations on where to start troubleshooting? Many thanks Aaron

Hi all, I built my Rev 1 QMX kit a while back and got bitten by the shorted diode on the SMPS board. After fixing that, the QMX works very well. However, in the hardware diagnostics screen the PIN diode bias current is all over the place. If I put the rig into transmit with the dummy load the current goes from about 17mA to about 70mA and everywhere in between. Any idea if this is an issue and where I should start looking? TIA. Jason

Hi, I try to upgrade the firmware of my gcx mini, and mess up the fuses. after I corrected it to avrdude -c usbasp -p m328p -U lfuse:w:0xF7:m -U hfuse:w:0xD1:m -U efuse:w:0xFC:m It shows the use original ic on screen :( Is there a trick i can do, to bring it back to life? Regards Andreas / OE9ROE

Hi All, At 63 my mind id blown at how fast and cooperative these projects are going. I do not have the balls or knowledge to dare install a Beta firmwhere on my QRP QMX, but I am eagerly waiting for the official release. Thank you all! Rgds, a.

Hello! I just upgraded my QMX+ to the current official version with SSB. Got good reports on the 40M swap net. Woohoo! I was using it with my "Tiny Linear" project, which is a 70W amp crammed into a too-small enclosure, with a switchable LPF salvaged from a defunct Yaesu 756-Pro radio, and a cute little touch screen in the front. I am beyond impressed... clean SSB out of a digital PA. I'm thinking of integrating the QMX+ ( or the QMX - I've got one of those too ) into another project: my "Medium Linear". This is a pair of MRF300's in a wraparound case from a Heathkit Single-Bander. No, I didn't cannibalize an actual Single-Bander - the case was a flea market buy. A QMX or plus integrated into the Medium Linear would turn it into an integrated 400W transceiver. But to do that, I need to get at least the band info out of the QMX+. Given that the software is closed-source...and encrypted, I have no reasonable way to figure out how to do that. Yeah, there are select signals on the card, but the LPFs are shared between bands. My linear also shares LPFs, but possibly different ones. Hans was going to implement some sort of scripting language. Maybe that could leave the back burner now that SSB is real? - Jerry, KF6VB

How would one use a ProgRock2 in a Colpitts crystal oscillator? A crystal is essentially an LC circuit, while the ProgRock outputs a square wave. Can the ProgRock2 simply replace the crystal? If so, will the Colpitts circuit turn it into a sine wave? Does the ProgRock2 start up at the last frequency used before its last power down? Steve, N9SZ

Can anyone give me a direct URL for the latest QCX+ mega328 firmware? I found a link to the T1_08.zip file through this board but not seeing a link to the latest (1.09a ?) TIA. Charles.

When I power up my low-band QMX, put it into DiGi mode, then start WSJT-X in FT8 mode, I get tons of decodes. If I then enable transmit, it will transmit with about 3.5 watts on 20m and my signal, as reported by pskreporter.info, covers the entire United States (at least today). However, after that first transmission my decodes stop. Even though the QMX is still in DiGi mode, I can no longer hear FT8 stations. If I then put the QMX into USB mode then I can hear lots of FT8 stations and decoding resumes, but as soon as WSJT transmits it puts the QMX back into DiGi mode, I can no longer hear FT8 stations, and the decoding stops. My transmitted signal continues to be heard throughout the United States. Any suggestions as to what I'm doing wrong? Best, Jim / K8DDV

Hi all, I tried to update my QMX today to the famous SSB SW. But the QMX is not shown as drive in the explorer, although it has worked before several times in last year. I tried all remedies utube offers: Re-install USB device drivers, USB root, power settings, repair windows etc, nothing worked. Even 4 different PCs, win10, win 11 and laptop with linux Mint. All tell the same error message.. Did also a factory reset of the QMX and used 3 different USB cables. No success. The PC see the device, but due to missing name do not not proceed. Could it be a fault in the QMX? Has anybody any advice out there?

Hi Hans, Is there a maintained Feature Request list available somewhere where we can check if what we’d like to see has already been asked for, and perhaps add a vote? I know posts can get lost in the volume, and I expect that is why there was no answer on my question on having variable TX power available as a setting (/g/QRPLabs/message/143397), but I don’t want to bug anyone, so if there was a tracker we could look at, it might save you getting duplicate requests or being bugged by people like me :-) Love the pre-built QMX, am going to get a QMX+ kit to have a go at… 73, Stefan MI0PYN