Re: QMX Audio Noise when switching to Digital mode
Matt,
I had a similar problem with my QMX when I had metal knobs on the encoders. An ESD event from my finger would cause the screeching. Try grounding yourself before touching the QMX ( I am assuming you don't have any knobs on the QMX yet and are just turning the encoder shafts)
Gary
W9TD
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Re: BNC connector doesn't work.
Remove the washer. Of all the QCX's I've built I've had to leave that washer off on all of them.
-mike/w1mt
I ordered a OCX-mini 20 meter and had it built by QRP as I don't solder. Finally tried to connect coax and the connector will not close all the way. Same problem with a dummy load. So the unit is useless, see attached jpg to see the problem, notice the part I have circled in blue. I've seen another ops ocx-mini and the bnc connector doesn't look like the one on my unit.
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BNC connector doesn't work.
I ordered a OCX-mini 20 meter and had it built by QRP as I don't solder. Finally tried to connect coax and the connector will not close all the way. Same problem with a dummy load. So the unit is useless, see attached jpg to see the problem, notice the part I have circled in blue. I've seen another ops ocx-mini and the bnc connector doesn't look like the one on my unit.
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On Fri, Feb 23, 2024 at 05:12 PM, Bob W7DIT wrote:
with a toothpick
I'm using a steel fixing pin. The pin takes no solder. Maybe you should grind a bit from the tip. 73, Ludwig
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Re: QMX HIGH BAND NO RF OUT AFTER ANOTHER 10 hour WSPR TRANSMISSION
hi Michael, I don't know if it's a bug in firmware 16, but I also did a factory reset and it's the same thing, no RF output, while before it output 6W now it has a current absorption of 90 mA with the light on and in transmission 190 mA, tomorrow I will try to load the previous firmware again to see what happens.? Thank you very much 73
Giuseppe iu8eun
My guess is that this is a firmware bug.
My QMX Low Bander does the same thing if I leave it on over night.
Hans is making great progress though with all the updates:)!
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So I tried it and it worked fine, same transmit power as my 12v battery (3.2w on 40m) .?
No issues whatsoever.?
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Re: #QMX first powered test -- is this right?
#qmx
On Fri, Feb 23, 2024 at 08:49 PM, Eric W. Hansen wrote:
and push the button on the rotary encoder
Hi Eric, I did this yesterday at my 2nd QMX (20 m - 10 m) and it worked. Wish you success. 73 Ludwig
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Thanks for that Rod, I am still experimenting, will try your method,
Cheers
Martin
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On Thu, Feb 22, 2024 at 09:33 AM, Martin Hanraads wrote:
3 supports, centre and each end, which means carrying more stuff. However, if you use walking poles, they would do for end supports.
I use long string extensions to the EFHW instead of end supports.? If the mast is near the operator the wire goes up with only a short extension string to elevate the matching unit.? The far end of the EFHW has several metres of string (actually 1.6mm nylon
blind cord) which keeps the end of the EFHW at about half the height of the mast.?
73
Rod
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Re: #QMX first powered test -- is this right?
#qmx
Thanks, Ludwig, good question.? The ViFly, with no load connected, registers 40mA on my bench supply's meter, same as with the QMX connected.? This implies that the QMX isn't drawing anything, so I can now increase the current limit on the supply and push the button on the rotary encoder.
Eric
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Re: QMX Audio Noise when switching to Digital mode
Thank you Adrian.?
The IQ mode is not enabled. Also, I tried a factory reset but the issue remains.
73, Matt
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I really do not want to drill them, either. So, you actually got them to clear with the solder wick?
"I soldered a capacitor in the wrong place on one of my kits and managed to successfully remove it and get the holes cleaned out. I used solder wick with a little flux, but I first added some fresh solder to the holes to give the solder wick something to grab on. I had to do it a couple of times on one hole, trying from both sides, but it worked."
I will try your technique, first. Thank you!
--
73
Karl
KI4ZUQ
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I am looking for an OHR Explorer II from the 1990s.? Does anyone have one ?
Kris? KM2KM@...
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Re: QMX HIGH BAND NO RF OUT AFTER ANOTHER 10 hour WSPR TRANSMISSION
My guess is that this is a firmware bug.
My QMX Low Bander does the same thing if I leave it on over night.
Hans is making great progress though with all the updates:)!
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Re: QMX Audio Noise when switching to Digital mode
Hello,
Isn't the "IQ mode" setting in the "Digi interface" menu enabled, by any chance?
If not, you may also try a factory reset.
Regards,
YO3GFH
op. Adrian
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QMX 12V high RX current
#qmx
Hi OMs
I could not remove the original problem - a large current on the receiver (about 168mA), but I use the QMX radio in both DIGI and CW mode and it works fine.
I tested the radio again in Terminal applications using the LPF sweep function - all ok.
I also tried the Terminal test using the RF filter sweep function and it was bad on all bands. In the permeable part of the curve, in the middle of the band, where the attenuation should be a few dB, it is always around -20dB. Around -30-45dB at the edges of the curve. It looks like the transmission is heavily muffled by something (-20dB) during reception on all bands, but the radio still works!?
Can anyone think of what could be wrong and if there is a connection between the attenuation of the RF filters and the high current during reception??
OK2PKT Roman
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Additional information:
using terminal - Hardware tests
rotate the encoder in a medium speed
the arrow shown is ok but sometimes for a moment an arrow in the wrong direction is flashing up
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QMX Audio Noise when switching to Digital mode
I finished assembling a high-band QMX on a 2023 Rev 2 board. First power up, no smoke! Everything seems pretty good except for when I tap the left encoder to enter digital mode, a horrible screeching noise emanates from the Audio port. With headphones on, this is a painful surprise!?
Has anybody else noticed this? Is it a known issue?
Firmware is 1_00_017 16-Feb-2024
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Re: #QMX first powered test -- is this right?
#qmx
On Fri, Feb 23, 2024 at 05:54 PM, Eric W. Hansen wrote:
I set my bench supply to 6.8V with a very low current limit.
Be aware you need around 160 mA to start the QMX.
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Thank you so much, Hans, for the reply.
I really appreciate your customer care and especially your responsiveness to your vast? market.
Charles K5KXJ
On Friday, February 23, 2024 at 09:27:43 AM CST, Hans Summers <hans.summers@...> wrote:
Hi Charles, all
To be clear: ***NO*** QMX Rev 3 will have a Q202 problem. 100.0% of all the 1,000 in the batch, the Q202 will be changed by us, to the Nexperia BSS84AK I sourced. It should be noted also that it's a precautionary measure. Even with the factory assembled BSS84 it works fine... But it is a little vulnerable if you didn't observe good ESD practices, and this is why we are changing it. I didn't want to introduce a new increased failure probability mechanism.?
73 Hans G0UPL
Hans,
On 2/19/24 I received an email stating my QMX high band shipped.??
Today FedEx shows "label created" as status.? Will my order #82084?have Q202 problem?
Charles Murrell
K5KXJ
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Re: #QMX first powered test -- is this right?
#qmx
On Fri, Feb 23, 2024 at 05:54 PM, Eric W. Hansen wrote:
ViFly ShortSaver 2
Which current if you remove the power connector from the QMX? How much power consumption by the ViFly ShortSaver 2? 73, Ludwig
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Gary W9TD
Karl
Michael N2ZDB