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Re: QMX won't power off and odd voltages on Q103
I put the bench supply up to 9volts and 250ma. Still couldn't shut it down, so the MCU isn't starting.?
I've looked at the board, and it looks fine visually. There wasn't much I could do to hurt it, since the only thing the builder does is solder the pins of the 2X4 female connector to it. I've checked those and freshened them up several times. Also, I've touched up the pins of the male connector 2X4 where they connect with the main PCB. And I checked those pins for shorting to the Source and Gate of Q103.? Can someone point out some specific steps I should take next? Phil K3UT |
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Using a QDX with AndFLmsg for Olivia
Hi folks,
I am trying to use my QDX-M with a Galaxy S-5 phone, using the AndFLmsg app to run Olivia. I am able to transmit Olivia messages OK, using "VOX enabled", as I can receive the transmission on another SSB receiver and decode the message with a second Galaxy S-5 listening to the audio. What I can't seem to do, is use a QDX-M to pass received audio by USB (and OTG connector) to a Galaxy phone for decoding. I would be very happy to hear from people who have managed to get the Phone/QDX interface working both on Tx and Rx. Thanks for any comments Ian VE6IXD |
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U3S No Power Troubleshooting
I have had my U3S running (nearly) non-stop for a couple of years with no issues.? WSPR spots reported from Japan to Germany.
Recently...nothing. The QRP-Labs Dummy Load reports: ? 80 meters: 0.022 volts (yes, that's two one-hundredths of a volt) ? 40m: 0.03 ? 30m: 0.09 ? 20m: 0.05 ? 10m: 0.04 I will appreciate hearing from others who might have experienced something similar.? Where did you start troubleshooting? Were you successful in returning your U3S to operation?? What was the fault? I was running at 5 volts, with a single BS170, 5x switched filter board, GPS mounted in the top of the standard enclosure (patch antenna fed through). Thanks. |
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Re: QRP antenna tuner?
On Wed, Aug 30, 2023 at 10:35 PM, Da Amazin' man G0FTD wrote:
Now then, don't get me started about variable caps.1.33pf per meter of wavelength and then make the inductance to suit for optimum Q. ? -- - 73 de Andy - |
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Re: QRP antenna tuner?
On Thu, Aug 24, 2023 at 02:39 AM, Daniel Walter wrote:
Recommendation is not to switch inductors while transmitting. Really pretty easy to peak up noise or signal on Rx, then just use Cin & Cout to fine tune. Rarely do you need to change inductor, but if you do, turn off Tx during switching.?Good advice. Unless you know how the switch works then this advice should precedence. But just one small note, it can depend upon the switch type. Switches can be break and then make (potentially leaving an open circuit before the switch has made) or can be the opposite (make before break) Break before make or make before break. It can make a difference to expected operation and is often overlooked when purchasing a simple switch in other circuits too. Now then, don't get me started about variable caps. Linear wavelength types and linear capacitance types, mostly forgotten knowledge these days ;-) -- - 73 de Andy - |
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Re: Changing USB port on QMX
I haven’t fully sorted this out but I think that if you assign a com port it survives to any physical port and through restarts. Give this a try:
Colin - K6JTH? |
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Changing USB port on QMX
I've just inadvertently? connected my QMX to a different USB port on my W11 laptop and it failed to connect the WSJT-X.? What happens is that the different port means that a different COM port is assigned and different USB audio ports.
Is there a way for an individual QMX to retain it's serial and audio port designations if it's moved to a different USB port on the same PC? What I've found is that a FTDI serial port will do this but most others won't.? It makes things far easier - for the user at least. And the developer, they stop getting "I can't find my QMX" messages. Chris G5CTH |
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For Sale: Mini-OCX 40m
Purchased and assembled by Hans 2021. Worked flawlessly for a few months and then the tuning encoder started locking up Have replace the encoder three times and once again the new encoder will not even change frequencies.
All other functions work. The towel is flying through the air $75.00, includes shipping within continental U.S. Tony |
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Re: CAT port returns ` ` ` on QCXmini
开云体育Thanks everyone for your help. ?I now have CAT control of the QCX mini so I can continue to troubleshoot until I have an LCD display again. ?What I didn’t understand initially was that it wasn’t just about RS232 voltage levels that were preventing CAT access it was also that TTL does not swing to a negative voltage like RS 232 does. ?I inserted a TTL to RS232 converter that I previously purchased for another project and now I have CAT access using FLrig software.Thanks and 73, Jerry AC5JM? On Aug 30, 2023, at 11:51 AM, Jerry Moyer via groups.io <ac5jm@...> wrote:
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Re: QMX won't power off and odd voltages on Q103
Did you load firmware? --n1bs On Wed, Aug 30, 2023, 2:32 PM PHILIP GRAITCER via <pgraitc=[email protected]> wrote: We are in a hurricane watch and tropical storm ?watch and tornado watch, so to take my mind off the weather, I am trying to get my QMX, Rev 1 going. |
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Re: QMX won't power off and odd voltages on Q103
开云体育One thing, you can't turn the QMX off
until you have turned it on.
The turning off process is controlled
by the MCU, it sees the long press and does a load of close down
housekeeping, saving parameters, closing down things, putting the
cat out, then finally turns it's own power supply off.? It's not
death, just sleeping.
But from what you are saying the MCU
hasn't fully started.? You mention that the power goes to your
limit and the voltage drops.? It's less than 5V and too low to get
the 5V supply fully active. This means that the MCU may be in the
start up sequence waiting forever for 5V on the 5V rail.? It
hasn't fully started.
Try increasing the current limit a
little, I wouldn't go over 250mA.? See if that helps.? If it
doesn't then there's something taking too much current from the 5V
supply.? That needs to be found and fixed.? If you can try
checking the 5V PSU board separately, maybe something on that has
shorted.
HTH
Chris, G5CTH
On 30/08/2023 19:32, PHILIP GRAITCER
via groups.io wrote:
We are in a hurricane watch and tropical storm ?watch and tornado watch, so to take my mind off the weather, I am trying to get my QMX, Rev 1 going.
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Fw: [QRPLabs] QMX - sockets for BS170s
#qmx
开云体育
Hans,
For Reference as suggested: From Billy (N5SE), My QMX is still in Turkey!
Graham Whaley wrote on Wednesday 08/30/2023 at 06:32 CSDT titled Re: [QRPLabs] QMX - sockets for BS170s
??????|check out the heatsinking on message
/g/QRPLabs/message/108109 |
Looks great to me. Any chance of getting something like this as an add-on to the QMX. Could be worth it.
From: [email protected] <[email protected]> on behalf of Graham Whaley via groups.io <graham.whaley@...>
Sent: Wednesday, August 30, 2023 05:54 To: [email protected] <[email protected]> Subject: Re: [QRPLabs] QMX - sockets for BS170s ?
Aha, I knew I'd seen a photo with pin headers under the BS170's recently - check out the picture of the heatsinking on message
/g/QRPLabs/message/108109
Might want to ask Cliff, AE5ZA how that is working out ;-)
Graham, M7GRW
On Wed, 30 Aug 2023 at 11:40, Jerry <Jerryh47@...> wrote:
After repairs done multiple times replacing FET Q9 in my QDX transceivers the pads are getting “tired.” ?I used some small brass tube stock (~1 mm outer diameter) to make eyelets or grommets to reinforce the pads. A short length of the tubing goes through the pad and is swaged with a center punch on both sides of the PCB. They are not sockets but do strengthen the pads so the pads don’t lift off the board so easily after several soldering cycles.? -- N5SE Billy Wayne Moore 7066 Shady Knoll Ln Willis, TX 77318-6324 Phone: 936-537-2975??? |
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QMX won't power off and odd voltages on Q103
We are in a hurricane watch and tropical storm ?watch and tornado watch, so to take my mind off the weather, I am trying to get my QMX, Rev 1 going.
I have set my power supply at 7volts and limited current to 200ma. The unit powers on and the LCD turns on but is blank.Brightness does not change when variable resistor adjusted. I am unable to turn the unit off with a long press on left encoder. I have to turn off bench supply. I measured voltage on Q103 with encoder off Gate 6.93 Source 6.68? With unit on, the bench power supply drops to 5.2v and 198ma (But I can't turn unit off) Gate 0.00 Source 4.96 Realizing my first problem is not being able to turn the unit off, I checked and touched up connections on encoder (as usual, the tabs broke off during installation and I used component leads to connect broken tab to appropriate hole). ?During assembly I had to remove the 2x4 female header on the main board because it wasn't straight. One pin of the female header remained in the hole. I removed that by hand and slipped it back into the header. I checked for continuity between the top pins on control board and the solder pins of the female header on bottom of main PC board so I assume that the female header is ok. On the 5V power supply board, I touched up the tabs on the 8 pin female header and checked for any possible shorts between those pins and the source and gate of Q103. I had previously clipped these pins slightly shorter. With bench supply at 8volts (used a higher voltage to see if that might wake up the board), I measured voltage of the pins on top of the female header of ?5V board. Unable to access four pins underneath the board. ?Designating the pin closest to the 1/8" jacks as pin 1, here is what I got: Pin 1 encoder off 7.92 ?on 5 Pin 2 encoder off 0 ?on 1 Pin 3 encoder off 8.0 ?on 5 Pin 4 encoder off 0 ?on 2.16 At this point I am stumped. There is a short somewhere and/or open connection.?I have little electronics theory knowledge, does anyone have any ideas what I should do or would you like to take a look at my unit? (This is about my 6th QRP-Labs kit.) Thanks in advance. Phil, K3UT |
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QMX Menu Suggestions
Hans, here are a couple of minor suggestions from the Operations Manual.
4.6 - Frequency Presets - Why not have CANCEL be the EXIT button (rather than the right rotary button) and LOAD be the right rotary button? That would make it more intuitive with the usual function of the EXIT button?and consistent with the Messages selection buttons. I realize that this is currently consistent with the QCX, but I never liked it there either as I usually ended up cancelling rather than loading! I just didn't say anything. 5.14 - Clock Setting - Is there any way to set the clock manually? Might be nice to do, so I don't have to use another device to log QSOs? I normally log on paper and don't drag a GPS unit along for SOTA. ? ? ? ? - Backlight setting - Should be a way to turn the backlight on temporarily for 5 seconds or so, by single button pushes. Along the same lines, it would be nice to have a third setting that normally has the backlight off, but automatically turns the backlight on for 5 seconds or so whenever a button is pressed or an encoder turned (but not when paddles or key are pressed). Don't know that you need both of these things - the latter would work just fine. 5.17 - Factory Reset - Suggest putting the 'Enter 17' system (from QCX) back in place. Although I haven't done it, it would just be too easy to accidentally press the encoder button when you meant to turn it. -- 73, Dan? NM3A |
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Re: 2nd QMX Build and it wont power on and an update on my old unit...
Hello Devan A technique I suggested for QCX troubleshooting was to bypass the signal generator resistor (120K in QCX, 100K R518 in QMX) with a much smaller resistor, say 330-ohms. Then the signals are enough amplitude that you can trace them through the LPF, BPF and trifilar transformer, with an oscilloscope. Signal tracing, oldest techniques, still valid. I don't think there's a problem in your PCM1804 or digital Signal processing. I'd guess it's in the filters or mixer. 73 Hans G0UPL On Wed, Aug 30, 2023, 7:17 PM Devan Phillis <devan@...> wrote: Hans, |
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Re: CAT port returns ` ` ` on QCXmini
Thanks, I'll try that as well. -Jerry AC5JM
On Wednesday, August 30, 2023 at 09:16:16 AM CDT, Chuck - K3FLN via groups.io <chuck.salmon@...> wrote:
Putty can be configured to wait for carriage return to send message.? Just set "local line editing" and "local echo" to "force on"?in the terminal options. -- Cheers, Chuck |
Colin Kaminski
N5SE
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