Hi Roger,? Does it use grounded PTT? If so, there is a required mod:
- QMX Rev 1, 2 and 3 PCB's - please??for details of necessary modification for grounded PTT output to work
I can’t seem to get the click to hyper link. But it’s on the QMX page. ? Simple jumper wire mod ?
Mark N8MH
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Using a rev 1 QMX and V 17 firmware, I've enabled the 5 volt PTT signal in the Band Configuration.? I can measure that a 5 volt signal is present on the PTT ring when the QMX transmits, but it does not key the 50 watt PA.? A QCX unit works fine to key the PA.? What am I missing?
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Re: QMX (20-10, 1_00_017 fw) RIT dissapeared
I'm having the same problem with my QMX as well. Is there a setting I'm overlooking?
Don WA2SWX
On Sat, Mar 9, 2024 at 10:55?AM < oh2jxa@...> wrote: Hello,
Can not switch on RIT after two days of normal CW operation at 17&15 meters. Short and long press of left knob are OK only double click has no any effect. Double click works well at right knob and both encoders. Factory reset did not help. I suspect some?problems with the contacts, it looks like the button will have to be replaced. I would appreciate other suggestions.
73
Igor oh2jxa
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I updated to 1_00_017 this morning. I hadn't updated the firmware for about 3 revisions. I went in and configured the display settings to enable Display/controls and enabled Battery: Icon ad Pwr/SWR display On. I noticed that I was not able to send CW. Checked I was not in practice mode, power cycled and still couldn't send CW. Checked and changed out cabling for the keyer and still unable to send CW. I did a factory reset and it all came back. I went back to find out why, and found as soon as I enabled Battery: Icon then I lost the CW again. I left CW off but enabled PWR/Display: On, rebooted and got CW send back, however even though I enabled PWR/Display: On, they do not display for me. Is anyone else having this happen? Not sure what else to do on my end.
72 Scott
KN3A
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QMX (20-10, 1_00_017 fw) RIT dissapeared
Hello,
Can not switch on RIT after two days of normal CW operation at 17&15 meters. Short and long press of left knob are OK only double click has no any effect. Double click works well at right knob and both encoders. Factory reset did not help. I suspect some?problems with the contacts, it looks like the button will have to be replaced. I would appreciate other suggestions.
73
Igor oh2jxa
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Re: QMX hi band birdies (internal oscillations)
#qmx
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I have one of these kits, the Wall Wart Tamer from Pacific Antenna, but have not assembled it yet. I intend to use it for powering my 12V QMX from my travel trailer power supply.
See:?
Roy - KI0ER?
Littleton, Colorado USA?
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Re: HELP - Broken SMD Capacitor
#qmx
Great tip. No pun intended. I'll look those up right now ...
On Sat, Mar 9, 2024 at 7:56 AM, Donald S Brant Jr <dsbrantjr@...> wrote: On Sat, Mar 9, 2024 at 01:05 AM, Larry Acklin wrote:
?Curved nose tweezers help a lot.?
I style #7SA tweezers for these tasks.? They have long, thin, curved blades and, importantly, are non-magnetic stainless steel ("-SA").?? Most chip components have nickel barriers under the terminations and will stick annoyingly to magnetic tools. Using two fine-tipped irons will make installation, and especially removal, of chip components simpler. Good binocular magnification is also a great help. 73, Don N2VGU
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Re: HELP - Broken SMD Capacitor
#qmx
On Sat, Mar 9, 2024 at 01:05 AM, Larry Acklin wrote:
?Curved nose tweezers help a lot.?
I style #7SA tweezers for these tasks.? They have long, thin, curved blades and, importantly, are non-magnetic stainless steel ("-SA").?? Most chip components have nickel barriers under the terminations and will stick annoyingly to magnetic tools. Using two fine-tipped irons will make installation, and especially removal, of chip components simpler. Good binocular magnification is also a great help. 73, Don N2VGU
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Re: QCX and QCX+ For Sale
Hi Gary.? I won't be available this morning.? I am a VEC and we are testing for Technician and General this morning.? Please call me this afternoon if possible.? I can pay you by check or PayPal or Zelle.? My address is 5224 Nova Ct., New Port Richey, Florida, 34653.? Thanks again, Steve KY4GX
Glory to God in the highest, and on earth peace, good will toward men. Luke 2:14
On Friday, March 8, 2024 at 01:43:40 PM EST, Gary K4VIG <gwgrogg@...> wrote:
Steve,
They are yours.? I'll get back to you soon.
Gary
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Good news! -- 73, Dan? NM3A There are moments when everything turns out right .... Don't let them alarm you; they pass.?
-Jules Renard
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Re: Off-topic: ZM-2 tuner with QMX
Todd,
In the old days (1960s) we used to tie the ends of our 80 meter dipole coax together against a good ground and it worked after a fashion on 80 meters if we had the correct crystals. ?Of course in a DX 40 the Pi network tuning functioned as an antenna tuner. ? Not the best but it worked. Be the REASON someone smiles today.
Dave K8WPE
toggle quoted message
Show quoted text
On Mar 8, 2024, at 7:40?AM, Todd W2TEF <w2tef@...> wrote:
?Thanks for the responses.?
It sounds like 80m on a 40m dipole may be a quixotic pursuit. But that 30m might not be so unreasonable.?
My diople is about 33ft up, fed with about 100' of DRF-400 (with a break in the middle for a lightning arrester). It gets a perfect match on 20m (LED goes out), but only some dimming on 30m and 80m (and transmitting trips the SWR protection on the QMX). I think I got a reasonable match on 60m.
So in theory 30m should work? Are there common mistakes using or building a tuner to which I may have fallen prey? Finding success with 20m made me think I got it right, which leaves me confused why I can't use the same technique to get a match on 30m.
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Re: HELP - Broken SMD Capacitor
#qmx
Greg,
Were you doing g your building late at night? ?I have had the same issues when doing that…. Learned many years ago when tires (no matter how refreshing it is to be in my shack) that past 9 PM I am worthless when trying to follow and understand building instructions. ?My best time is early in the morning when I should be doing other obligations. ?
We live and sometimes learn.
Be the REASON someone smiles today.
Dave K8WPE
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Show quoted text
On Mar 9, 2024, at 12:57?AM, Greg McCain via groups.io <gamccain50@...> wrote:
?SUCCESS !!
DigiKey came through really quick.
I experimented with BliueTak and found it good for 'picking up'? the tiny bugger and not having it fall off when moving it to the PCB? . . . but . .
my attempt to use a tiny dab of Blue Tack to hold the cap down on the board between the pads didn't really work out well. The space was so small? and heat transferred quickly when attempting to solder that the tack just softened and the bugger moved around in a blue slurry. Cleaned up everything and started over.?
Ended up just getting mentally ready, donned a magnifying head lamp I bought (cheap but surprisingly good from Harbor Freight), used a small gripper tweezer and was able to tack solder one end.
Then full soldered the other side, let everything cool and final-soldered the first end.
It looks a bit wonky but .. . . . there is good continuity between each PCB pad and the top of the metal end caps on the component.
Definitely not shorted either . . .? so one in the win column???
Greg? ?KI4NVX
P.S. Pulled another bone head mental break and ended up destroying the BNC connector. Long story ...? Complete Operator Error.
Thought I'd created a short underneath the connector housing. Brain was thinking Power Connector and there wasn't any way I was going forward if I had managed to short the main power input.
Don't have a lab grade vacuum solder removing station and the metal shell and 4 big connections to the PCB ground plane just sucked up the heat. So ended up cutting it out and then clearing up the PCB after.?
DOH . . .? not the Power IN . . .? RF IN/OUT
Just placed an order for a couple of spares.
73?
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I wound all the LPF toroids and and fitted everything in the LPF area dry, making sure that everything fitted together, then soldered in the order in the manual.
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Re: HELP - Broken SMD Capacitor
#qmx
. My method is to lightly tin one side of the pad, maybe very lightly tin one side of the part.? Apply heat to the tinned pad, slide the part into place, a bit more heat, align as best?as possible.? Solder the opposite side, then go back and touch up the first.? ?Curved nose tweezers help a lot.?
If it’s a little crooked or not laying perfectly flat no worries.?
Larry KB3CUF?
SUCCESS !!
DigiKey came through really quick.
I experimented with BliueTak and found it good for 'picking up'? the tiny bugger and not having it fall off when moving it to the PCB? . . . but . .
my attempt to use a tiny dab of Blue Tack to hold the cap down on the board between the pads didn't really work out well. The space was so small? and heat transferred quickly when attempting to solder that the tack just softened and the bugger moved around in a blue slurry. Cleaned up everything and started over.?
Ended up just getting mentally ready, donned a magnifying head lamp I bought (cheap but surprisingly good from Harbor Freight), used a small gripper tweezer and was able to tack solder one end.
Then full soldered the other side, let everything cool and final-soldered the first end.
It looks a bit wonky but .. . . . there is good continuity between each PCB pad and the top of the metal end caps on the component.
Definitely not shorted either . . .? so one in the win column???
Greg? ?KI4NVX
P.S. Pulled another bone head mental break and ended up destroying the BNC connector. Long story ...? Complete Operator Error.
Thought I'd created a short underneath the connector housing. Brain was thinking Power Connector and there wasn't any way I was going forward if I had managed to short the main power input.
Don't have a lab grade vacuum solder removing station and the metal shell and 4 big connections to the PCB ground plane just sucked up the heat. So ended up cutting it out and then clearing up the PCB after.?
DOH . . .? not the Power IN . . .? RF IN/OUT
Just placed an order for a couple of spares.
73?
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Re: HELP - Broken SMD Capacitor
#qmx
SUCCESS !!
DigiKey came through really quick.
I experimented with BliueTak and found it good for 'picking up'? the tiny bugger and not having it fall off when moving it to the PCB? . . . but . .
my attempt to use a tiny dab of Blue Tack to hold the cap down on the board between the pads didn't really work out well. The space was so small? and heat transferred quickly when attempting to solder that the tack just softened and the bugger moved around in a blue slurry. Cleaned up everything and started over.?
Ended up just getting mentally ready, donned a magnifying head lamp I bought (cheap but surprisingly good from Harbor Freight), used a small gripper tweezer and was able to tack solder one end.
Then full soldered the other side, let everything cool and final-soldered the first end.
It looks a bit wonky but .. . . . there is good continuity between each PCB pad and the top of the metal end caps on the component.
Definitely not shorted either . . .? so one in the win column???
Greg? ?KI4NVX
P.S. Pulled another bone head mental break and ended up destroying the BNC connector. Long story ...? Complete Operator Error.
Thought I'd created a short underneath the connector housing. Brain was thinking Power Connector and there wasn't any way I was going forward if I had managed to short the main power input.
Don't have a lab grade vacuum solder removing station and the metal shell and 4 big connections to the PCB ground plane just sucked up the heat. So ended up cutting it out and then clearing up the PCB after.?
DOH . . .? not the Power IN . . .? RF IN/OUT
Just placed an order for a couple of spares.
73?
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Re: QMX hi band birdies (internal oscillations)
#qmx
Thanks everyone! At least I now know it's not just my QMX. This is not a deal breaker for me at all - just slightly annoying because I frequently activate and chase SOTA station at around 21060-21068 KHz.
If the birdies are coming from the SMPS modules though, I doubt that firmware can solve that!
It can! The whole point of the SMPS modules in QMX is that the control loop is code in the microcontroller. The microcontroller can choose a PWM frequency whose harmonics avoid interfering with the operating frequency (generating internal birdies).?
I didn't assign high priority to this part of the work, because evidently the birdies are surprisingly un-troublesome anyway, presumably due to the double-balanced nature of the sampling detector, common mode signals including power rail noise being greatly attenuated.
73 Hans G0UPL
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Eric K7EBR
oh2jxa@gmail.com
Donald S Brant Jr
David Wilcox K8WPE