Re: QMX - smoke - another C107/Q108 failure
I have worked on about 20 different QMX rigs for fellow hams. ?I made up a set of linear regulated ?PS boards for this kind of testing. ?3.3V from the existing linear regulator and 5V from a bench supply (fed from a hacked and burned up SMPS board) that I can control and measure the current. ?Feeding the ADC_ lines as well. ?This all works well and is very helpful in isolating problems and quickly confirming the main circuitry. ?One of my best tools.
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Thanks, Hans.?
At least now I know that it's not me.? I really have missed the really sharp, yet clear filtering of adjacent signs and low RX noise floor from an earlier radio in your line of stuff.?
72,
Ted
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Re: QMX - intermittent power up
Phil, Set your voltage to 8 or 9 volts.
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On Aug 27, 2023, at 6:03 PM, PHILIP GRAITCER via groups.io <pgraitc@...> wrote:
?When I plugged in QMX (built for 12V) and pushed left encoder, nothing happened (power set at 7V/200ma limit). Pushed it a few more times, and power did come on at 165ma, but then went off. Tried several more times and got it to go on intermittently, but it wouldn't stay on, only a few seconds.??
Touched up the left encoder soldering as well as 2X4 pin control board header, thinking that was the problem. Also removed and touched up the 2x4 and 2X3 female pins on both sides of the power supply board. Checked for continuity on 2x4 male header on control board to the main board and it was okay (I had to remove the 2X4 female header during construction since it wasn't straight and repositioned it, so I? thought maybe an issue with the female header.)
Now I am not getting it to go on intermittently as earlier.??
What's next to try?
Phil, K3UT
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Sorry if this is covered elsewhere (I’ve tried …)?
I’d like to modify my “first edition” QDX to receive on 15m. ?It’s not entirely clear to me to what extent the hardware and firmware modifications that have been made to provide higher band capability can be used with my build to achieve that aim. ??
Please would someone help me eg by pointing me to the manual or discussion topic that might provide answers??
73
Rod
G0VKX
one-time G8FJN
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QMX - intermittent power up
When I plugged in QMX (built for 12V) and pushed left encoder, nothing happened (power set at 7V/200ma limit). Pushed it a few more times, and power did come on at 165ma, but then went off. Tried several more times and got it to go on intermittently, but it wouldn't stay on, only a few seconds.??
Touched up the left encoder soldering as well as 2X4 pin control board header, thinking that was the problem. Also removed and touched up the 2x4 and 2X3 female pins on both sides of the power supply board. Checked for continuity on 2x4 male header on control board to the main board and it was okay (I had to remove the 2X4 female header during construction since it wasn't straight and repositioned it, so I? thought maybe an issue with the female header.)
Now I am not getting it to go on intermittently as earlier.??
What's next to try?
Phil, K3UT
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QMX - intermittent power up
When I plugged in QMX (built for 12V) and pushed left encoder, nothing happened (power set at 7V/200ma limit). Pushed it a few more times, and power did come on at 165ma, but then went off. Tried several more times and got it to go on intermittently, but it wouldn't stay on, only a few seconds.??
Touched up the left encoder soldering as well as 2X4 pin control board header, thinking that was the problem. Also removed and touched up the 2x4 and 2X3 female pins on both sides of the power supply board. Checked for continuity on 2x4 male header on control board to the main board and it was okay (I had to remove the 2X4 female header during construction since it wasn't straight and repositioned it, so I? thought maybe an issue with the female header.)
Now I am not getting it to go on intermittently as earlier.??
What's next to try?
Phil, K3UT
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New Chat: QDX high band V5 no transmit above 20M
#chat-notice
A new chat has been created:
Hello.
I posted recently about this issue but thought I would explain a little more.
The reception on all the high bands is excellent but it will only transmit on 20M or it will also try to load up on 40 and 30M.
I installed the jumper that was supposed to force the rig to highband but it does not.
Thanks,
Andrew
K6STN
By:
Andrew Steen <k6stn.1@...>
View/Join This Chat
Do not reply to this message to post to the chat. You can participate in chats only through the group's website.
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Re: QMX where can I find the future
#qmx
The software is still very much at an alpha stage. There are quite a few usability bugs to sort out. Soon, I am sure the big features will be ready. I haven’t been planning on SSB till next spring. I can QSO in CW and all single tone digital now. Hans has mentioned he has bugs, goals and hopefully “reach goals” to work on. The goals include enabling the SWR meter and implementing high SWR power reduction. I am not sure if SSB is a goal or a reach goal. ?
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Colin - K6JTH?
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Giuseppe it looks like you have 2 turns of the #22 (0.60 mm) wire on the T507 transformer. I believe the #22 wire should only got through each side of the core one time!!
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73, Rick
VE7TK
Website:
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I just completed the high band version (5) of the QDX.
Everything seems to be correct and all continuity tests are a go.
Problem is it will not go above 20M.
I have installed the jumper, but no go.
Any ideas
73,
Andrew K6STN
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Re: QMX RX "carrier" noise
Thank you Mike and Mike. I didn't know this had not yet been implemented in firmware.? All part of the fun. Each FW update is like a little gift.
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Re: Message repeat doesn't
#qmx
Yep. That works! Thanks, Jonathan!!
73, Randy,? KS4L?
On Sun, Aug 27, 2023, 10:13 AM Jonathan Burchmore < burch@...> wrote: Hi Randy,
Are you starting transmission by pressing the right encoder or the left (select) button?? The QMX works the same as the QCX series in that the left button repeats but pressing the encoder only sends once.
I have experienced a lot of glitchiness with the QMX messages.? In my case it appears that most of the problems were due to corrupted message configurations from editing in the terminal with my backspace key set incorrectly.? However, after a factory reset and configuring the messages using the CW decoder it does appear that repeat works properly.? Firmware 1_00_009.
Jonathan KN6LFB
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Re: QMX RX "carrier" noise
In future firmware the SMPS frequency will be automatically adjusted to move the harmonics out of the way.
73, Mike KK7ER?
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Re: QMX - smoke - another C107/Q108 failure
Hi Hans Thanks for your help so far? So I checked the mainboard by
- supplying 3V3 from a linear regulator - CPU runs (can connect putty)
- installing the 3V3 SMPS board then applying 12V to the switched +12V line - runs OK so the 3V3 SMPS is good
- supplying 5V from linear regulator - with a voltage divider to feed ADC_5V - as you can see the measured 5V is looking good but the processor still detects an error - see screenshot
Ideas how to bypass that so I can complete checks ? Regards Rick
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Re: QMX where can I find the future
#qmx
Been there and done that. Only mention I found was SSB and quoting the QRP-Labs writeup, "until and if SSB is implemented". I am assuming that there is a plan somewhere for the future development of QMX and asked about it. Just doing my due diligence and gathering
all the data I can before making a decision to purchase one.
Thanks for your input, Billy
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Where can I find future planed enhancements for the QMX; SSB, Waterfall, etc? Thanks in advance, Billy (N5SE)
qrplabs.com ?
?
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Re: QMX where can I find the future
#qmx
Where can I find future planed enhancements for the QMX; SSB, Waterfall, etc? Thanks in advance, Billy (N5SE)
qrplabs.com ?
?
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QMX where can I find the future
#qmx
Where can I find future planed enhancements for the QMX; SSB, Waterfall, etc? Thanks in advance, Billy (N5SE)
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Re: QMX RX "carrier" noise
Normal for now. It is alpha firmware after all. Eventually Hans will sort it out
-Mike/w1mt
On Sun, Aug 27, 2023 at 14:35 Rick NF6G < rdante@...> wrote: Today giving CW receiving a try, hunting around for NJ Skeeters, I noticed a nasty carrier noise when tuned to 14.060100 Mhz. Switched to dummy load, it's still there. Swapped antenna to my FTdx10, it's not there, so it's something internal to my QMX. It's also on 14.052100, 14.035100, and so on. Rather than attach a 4MB 7 second video, I've attached some screenshots, using JTDX to give a visual. The two in CW mode are when I tune to 14.060100. The other one is 14.074 in digi mode.? What did I do wrong, and how do I fix?
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Today giving CW receiving a try, hunting around for NJ Skeeters, I noticed a nasty carrier noise when tuned to 14.060100 Mhz. Switched to dummy load, it's still there. Swapped antenna to my FTdx10, it's not there, so it's something internal to my QMX. It's also on 14.052100, 14.035100, and so on. Rather than attach a 4MB 7 second video, I've attached some screenshots, using JTDX to give a visual. The two in CW mode are when I tune to 14.060100. The other one is 14.074 in digi mode.? What did I do wrong, and how do I fix?
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Re: A Great Source for Power Supplies (FREE)
Yes I have a lot here at home in the UK that came from my old British Telecom (BT) routers and mesh discs.
Very RF quiet.
73
Daimon. G4USI.
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Colin Kaminski
Rick Williams - VE7TK
Randy
N5SE
Tronald Dump