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Re: Available Hand Mics for QMX SSB ?

 

For those that are using the K6ARK mics, what is your required mic gain? For mine, it is almost +70dB, which seems really high according to the wiki page. I am getting a lot of audio distortion with my testing and I'm trying to debug this.
?
73, Jared, N7MAW
Re: My Ffirst QMX SSB POTA #20m #amazing #antenna #qmx #ssb

 

Bravo. Thank you. Great testimonial with graphics.?
Re: QMX+ no power output, low SMPS bias current

 

I just discovered a slight change.? On 6m, the Bias SMPS current is about double at ~8.2mA.
Re: QMX(+) Build experience, Poor Audio Filter Sweep/RF Filter Sweep/Image Sweep/ADC IQ test and resolution with new PCM1804

 

Repeat and expanded, explained tests:
Point? ? ?Result
BNC? ? ? ? ?good
IC408
? Pin 5? ? ? ?good
? ? ? ? ?1? ? ? ?good
? ? ? ? ? 2? ? ? good
? ? ? ? ? 3? ? ? good
? ? ? ? ? 4? ? ? good
? ? ? ? ? 6? ? ? ? no
? ? ? ? ? 7? ? ? ? no
? ? ? ? ? 8? ? ? very weak
IC402
? Pin? ?9? ? ? very weak
? ? ? ? ? ?10? ? weak
? ? ? ? ? ? 11? ?noise
? ? ? ? ? ? 12? ? ?no
? ? ? ? ? ? 13? ? ?no
IC403
? Pin 7? ? ? ? ? ? ~55 mhz*
? ? ? ? ?9? ? ? ? ? ? ~55 mhz*
* very strong signal - twice rms of input (see picture)
?
?
?
73
Karl
KI4ZUQ
Re: QMX shutting off at 10.5V

 

Hello all,
?
Finally got the time to attach the QMX to the computer and I found interesting stuff... :
?
This is what it looks like TXing when the voltage is about 11V, nothing wrong apart from the supply voltage reading wrong by 0.2V
?
?
When I get the Voltage down to 10.8V, this is what I get and "interesting" stuff happens, namely the supply voltage is wrong by 1V, the 5V SMPS voltage is too high and the transmitter voltage is too low :
?
When I get down to 10.7V not TXing, even ,more surprising stuff happens, the supply voltage is completely wrong and on top of this the 5VSMPS gives us a very high reading which might well be true(ish) as the screen becomes darker :
?
My instinct would be the 5V SMPS is shot and weirdness ensues but I am not sure of myself at all! May be the overvoltage protection kicks and switches off the QMX. For reference, I destroyed one of the SMPS last year and replaced the 2. In theory they should be good....
?
Any help welcomed !
?
73,
?
Yannig - F4IUJ
?
?
Re: QMX+ no power output, low SMPS bias current

 

No good. :( I redid the loop connecting the SWR bridge to the BNC connector and the results are still the same.
Re: My Ffirst QMX SSB POTA #20m #amazing #antenna #qmx #ssb

 

Yes! CESSB on. I did the standard calibration per Hans’ directions and set up the mic with the tool in terminal.?
Re: Tariffs?

 

It's even worse than that. Read your email agreement. Most companies, like Google and gmail, have the right to not only open and read your email, they can sell the information contained therein to whomever they wish. I would broaden the warning to say: Don't send any email that you wouldn't show to the world.

Jack, W8TEE

On Sunday, April 6, 2025 at 12:05:40 PM EDT, Tony Scaminaci via groups.io <tonyscam@...> wrote:


Just for a bit of clarity… Turkey is not on the current list of tariffed countries. Further, never send your SS# or any other personal identifying information over email. Email is not secure.

On Sun, Apr 6, 2025 at 9:25?AM George Korper via <georgekorper=[email protected]> wrote:
The hidden problem here is not the money. Carrier
is asking a small business, to supply a tax id or identity information.
In the US that is SS#. Hans has a proficient assistant who may have to?
email each customer and ask for a SS#. This is a burden on a small business.?
I recall when the Red Cross demanded background checks on radio hams who were part of ARES,
many refused. But lets wait and see what DOGE and the US government do next!?
?
beta 1_01_003 FW strange behaviors

 

I just got back from the Pacific NW robotics district championships where N7BIN and team were competing.
There are a couple parks just off the highway near Spokane so took time for POTA on the way to/from.
I noticed a couple strange things with the 1_01_003?firmware on my QMX rev 2.
  1. At one point, after powering down to swap cables, the display showed USB mode but the rig was clearly in LSB mode. I switched to LSB on 20m and everything sounded normal again.? It appears that there is some way for the displayed mode and actual mode to get out of sync.
  2. When in SSB mode, I noticed that the SWR meter was swinging wildly into territory where SWR protection should have tripped, but SWR protection did not trip.? When in CW mode, it behaved as expected.? This was transmitting through a ZM-2 tuner adjusted for 1:1 SWR.
Despite this, and the challenge of 5W SSB with a low antenna, the activations were still a lot of fun.?
?
73, Mike KK7ER
?
Re: QMX and power bank PD

 

On Sun, Apr 6, 2025 at 05:03 AM, Muhsin TA1MHS wrote:
YES!?5.5 x 2.5mm?plug?works with me
Some 5.5x2.5 plugs may work.
But you inherit extra risk of intermittent power connection, which for some users has resulted in damage to their QMX internal power supply.?
?
The QMX/QMX+ power input is designed for a 5.5x2.1 plug.
?
Stan KC7XE?
Re: Tariffs?

 

Just for a bit of clarity… Turkey is not on the current list of tariffed countries. Further, never send your SS# or any other personal identifying information over email. Email is not secure.

On Sun, Apr 6, 2025 at 9:25?AM George Korper via <georgekorper=[email protected]> wrote:
The hidden problem here is not the money. Carrier
is asking a small business, to supply a tax id or identity information.
In the US that is SS#. Hans has a proficient assistant who may have to?
email each customer and ask for a SS#. This is a burden on a small business.?
I recall when the Red Cross demanded background checks on radio hams who were part of ARES,
many refused. But lets wait and see what DOGE and the US government do next!?
?
Re: Swr meter in SSB mode

 

Hi Nico,
?
FWIW, I see the same thing.
The SWR reading bounces all over the place but the SWR protection does not trip.
?
73, Mike KK7ER
?
Re: My Ffirst QMX SSB POTA #20m #amazing #antenna #qmx #ssb

 

Hi,
Were you using CESSB??
This is good news :)
George
K3GK
Re: QMX WSPR Anomaly

 

Grant,

A wild guess here is that you did not select WSPR in the Beacon Menu or perhaps you did, and the selection jumped??

John
KK4ITX



for Zephyrhills Area Amateur Radio Club
Many of life's failures are people who
did not realize how close they were to
success when they gave up.
? ? ? ?Thomas A. Edison? ? ?






On Sunday, April 6, 2025 at 02:45:08 AM EDT, Grant via groups.io <gmcduling@...> wrote:


I was trying out WSPR with my high band QMX with settings as depicted in the instruction manual. I had my QLG2 attached and working with the green light blinking. I had the transmit set to 4 after the hour as in the instructions, and when that time arrived, the rig kicked into transmit mode. All appeared to be going with when the display suddenly changed to read the following: 14,097,140 CW 5 0 On the next line: VK4JAZ QG62 30.
?
And there it remained, as if stuck. After a good few minutes I shut it down as nothing appeared to be happening.?
Any ideas what this means?
Updated Wiki Page: QMX External Microphone Options #wiki-notice

Group Notification
 

The wiki page QMX External Microphone Options has been updated by Chris <chris.rowland@...>.

Reason: Add reduced size images

Compare Revisions
My Ffirst QMX SSB POTA #20m #amazing #antenna #qmx #ssb

 

Hi all,?
I finally got outside with the QMX to do a POTA activation. My objective with this setup is to have a HF kit as small and light as possible to keep in the glove box of my car for impromptu activations or in between kids sports games, practices etc.?
?
QMX is a recent kit built 20-80m version 12v and kit includes:
  • 12 ah lithium ion battery?
  • kit built Tufteln QRP EFRW 71’ antenna
  • Retevis mic (Kenwood jack version modified for QMX)
  • thin paracord
  • Weaver 12 oz throw weight
  • 10m RG316 coax
  • Cheap earbuds
  • Toiletry bag from some airline?
Antenna was set up as a sloper with radiating end about 25’ in a tree and feed end down to a picnic table and tied to a BBQ. SWR was 1.9. ?Conditions on 20m were good but lots of activity from POTA and the Mississippi QSO party.?

I got my 10 contacts hunting since it was easy pickings. Great contacts and signal reports from all directions and I’m looking forward to many more outings with the QMX!
?
Re: Tariffs?

 

The hidden problem here is not the money. The Carrier
is asking a small business, to supply a tax id or identity information.
In the US that is SS#. Hans has a proficient assistant who may have to?
email each customer and ask for a SS#. This is a burden on a small business.?
I recall when the Red Cross demanded background checks on radio hams who were part of ARES,
many refused. But lets wait and see what DOGE and the US government do next!?
?
Re: Wiki Page: QMX External Microphone Options #wiki-notice

 

On Sat, Apr 5, 2025 at 09:20 AM, <rentwist@...> wrote:
Seems there is a permissions problem with the images you posted.? As such, the images are not displayed in your post.
?
I've fought the wiki edit system for hours and nothing seems to help.? The photos section won't accept images because it is full, maybe that's the problem.
?
?
Re: QMX+ no power output, low SMPS bias current

 

I did, but on another readthrough of the directions, I missed that it said to put it in from the underside of the board.? Let me try changing that.
Re: Wiki Page: QMX External Microphone Options #wiki-notice

 

I ordered a cheaper version that should be arriving today... Looks identical on the outside....
Gary
W9TD
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