On Sun, Aug 27, 2023 at 05:45 AM, Guido PE1NNZ wrote:

add excessive solder on both sides of the IC

The use of a low-melting point alloy such as ChipQuik will be a tremendous help in getting the solder to flow without excessive heat.?
I also use a #15 scalpel blade to cut the individual leads right at the package and remove them singly instead of trying to melt all 28 (or whatever) leads at once; leadless packages do not offer this option so the QhipQuik is even more helpful.? This is the process we used on hi-rel spacecraft boards as it was the safest for the boards, the ICs were sent for failure analysis or scrapped so trying to keep them intact was pointless.
Good stereo magnification is immensely helpful.
73, Don N2VGU

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

On Sat, Aug 26, 2023 at 08:15 PM, Glenn S wrote:

I have a PD "dongle" connected to it so that I can select an output of 9 or 12Volts.

It would be wise to connect the dongle and set (and confirm) its voltage prior to connecting the radio than to do the reverse and possibly subject the radio to voltage gyrations while the dongle output settles.
I use one of those inline USB voltage/current meters to check mine and see what the power bank voltage looks like under load.? I will need to measure how much resistance it uses for its current measurement someday but the voltage drop seems minimal....
73, Don N2VGU

Has anyone tried to move the QDX-M to 6-meters? What changes had to be made to the firmware and the LPF? I know the performance may not be perfect but I'm looking to experiment with it. Any help would be appreciated. Many thanks in advance. Jim WB2LHP

I know it may not seem like an RFI problem, but it still feels like an RFI problem from the given symptoms.

One of the problems that can happen is that the RF doesn’t make it out of the radio, but reflects internally, and causes things to get wedged.

I would check the entire output path from the final transistors through the output transformer and the low pass filters, including the BNC connector and whatever cables and adapters you use to connect to your dummy load, and even the dummy load itself.

Good luck! Intermittents are the worst!

73, Willie N1JBJ

开云体育

RFI-NOISE-KITS

///fails to return to receive mode after a transmission completes. I'm using VOX and currently don't have a good way///

I would still use RFI suppression even though you think it is not related.?

N4SO
Charles Brown

Does the QMX depend on having full USB3 support at the PC level, or can an USB Type C adapter be used? I am looking at ordering a QMX, but do not have USB3 available. I do have a multiple input USB3 adapter on one USB2 port. Thanks in advance, Billy (N5SE)

So to clarify - The manual at Rev H currently says to burn or drill out the center of the spacer nuts on the power board - That is no longer recommended according to the video?

That’s my plan too. Got the QMX but upconverter is on the slow boat from China… PD seems risky. Another post about the PD negotiation and starting on 5V then a fast increase kills the QMX. Should be OK if plug the QMX in last. Any way gonna test the upconverter cable too first before use.

/Daniel, SA7DAI

Does the QMX depend on having full USB3 support at the PC level, or can an USB Type C adapter be used? I am looking at ordering a QMX, but do not have USB3 available. I do have a multiple input USB3 adapter on one USB2 port. Thanks in advance, Billy (N5SE)

Correct.

jlloydham,

Could it be from the power supply?? Maybe a local RF source in the shack?? Long shots, as the sound system is all digital inside the processor.

73
Evan
AC9TU

OT sucessfully build your interface for my ic706 the only problem i have is adjusting. I have mo sweet point where ptt gets triggered and alc is zero for ft8. Any idea ??
Mny tnx/
/OT

I’m happy to do that for you. ?Only pay postage and parts plus whatever donation you want. ?I’ve done a bunch of these.

send it to me at

Jeff Moore
464 Route 28
Harwich Port, Ma 02646

I recently had a problem with my home internet. I noticed that when he replaced the modem or modem/router, he reused the existing power supply (wall wart). I asked him if I could have the unused power supply. It was a 12v 1A regulated supply (not class 2's which are unregulated). He said that I certainly could have it and, in fact, he literally had a bucket full of them in the truck. He happily gave me a dozen of them. Most were 12volts but there were several different amperages. He said they just throw them in the trash at the end of their day because they don't recycle them. All of the supplies had the usual barrel connector that perfectly fit my QMX.

Happy hunting!!

Chris - KE8VOD