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On Sun, Apr 6, 2025 at 11:09 AM, Muhsin TA1MHS wrote:

Hi?
I found and using this
5/9/12 (15/20(for the PC) if the PD of the Power Bank Supports)
9 and 12 volts are great for the QDX, QMX and QMX+
Buy the one with 5.5 x 2.5mm plug


73 DE muhsin TA1MHS

If you look into this link,

You'll see 3 types of plugs.

Only 5.5 x 2.5mm plug works with QMX.

This is not what I think, It is what I and other people are using.

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What we know/read may not be the ultimate truth

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What a waste of time

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73 DE muhsin TA1MHS

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On Sun, Apr 6, 2025 at 04:02 PM, Paul - AI7JR wrote:

Hard to understand measuring SWR if you truely have 0 watts out... :-)

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Paul -- AI7JR

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That's why I mentioned it in my original post.? The SWR is reported in the Diagnostics page on the terminal when I hit T for Transmit.? For me, it's all over the map, sometimes reporting in the 6-7 range, sometimes so high it just reports ####, and other times dropping down to the 1-2 range.? All of that while it claims 0W output (and a wattmeter on the dummy load shows no power).

Thanks Stan. I never studied magnetics so I wasn't sure how well that little core would react. The wires are still connected and none of the windings have come undone. I'll try gluing it tomorrow.

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I saw that kit on Amazon and that's my Plan B.

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Thanks again!

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Dave

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Yes, it should work fine if you carefully glue it back together, as long as the wires are not broken.?

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And if you need a new ones, I have used the 330 ones from this Amazon kit:

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Stan KC7XE?

Two thumbs UP.

GREG

I had been trying to figure out why I could not make any ft8 qso's. Seemed wsjtx was connected, got audio in my ear when transmitting. Would change radio bands. Turns out I missed when reading the manual, make sure computer volume is set to 100%, and no more. Mine was at 150%. Working great now. It always seems to be something I did wrong. Hope this helps someone.

I think L403 is coming off the board tomorrow....

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73
Karl
KI4ZUQ

I seem to have found my way into the Monty Python 'room for an argument'

Muhsin is correct.? As I noted in my original reply, some 2.5mm connectors may work.? Some are designed with spring contacts, and are advertised as being compatible with 2.1mm.? And those do achieve a good contact.?

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However, Muhsin, if there are two choices in a connector for a QMX trigger cable, and one of them is 5.5/2.1mm, as is the case with buying most brands of trigger cables, the correct and best choice is ALWAYS the 5.5/2.1mm connector.? It will provide better performance over the long term, and will avoid confusion with 2.5mm connectors which don't have spring connectors, and are dangerous for use with QMX/QMX+.

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Stan KC7XE?

On Sun, Apr 6, 2025 at 06:43 PM, <mitchellrlawrence@...> wrote:

I am going to start form the bnc and work my way back through the circuit unless I find any other advise?

Be aware that the VSWR transformer winding puts a DC (not RF) short across the output BNC connector.

73, Don N2VGU

Thanks Stan and John. I think that's what I probably did; changed the mode from WSPR to CW by mistake during transmission. I'll try again once I am out in another park soon.?

On Sun, Apr 6, 2025 at 11:48 PM, John Pokluda wrote:

oversized barrel

It is not a barrel, it is spring based, works with 2.1mm
73 DE muhsin TA1MHS

First check keyer menu and check your not in practice mode and then display and in CW mode.

This mistake I have made many times!

On Sun, Apr 6, 2025 at 11:48 PM, John Pokluda wrote:

Why on earth take the risk with an oversized barrel, even after Hans' otherwise comment?!

Hans's comment is:
5.5 x 2.1 is correct.?
my comment is:
THIS?5.5 x 2.5mm?plug?
on?
works?with?no problem!
Both are true
you can change the plug if you want.
73 DE muhsin TA1MHS

On Apr 6, 2025, 15:43 -0700, mitchellrlawrence via groups.io <mitchellrlawrence@...>, wrote:

Why on earth take the risk with an oversized barrel, even after Hans' otherwise comment?!

I just finished my build sounds similar to your issue?

0 watts

9.xx volts?

swr jumping a little mostly around 1.2-1.5

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I am going to start form the bnc and work my way back through the circuit unless I find any other advise?

let me know if you discover anything!!

On Sun, Apr 6, 2025 at 05:11 PM, Stan Dye wrote:

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.?

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All the mics I have assembled and tested with my QMX+ (which is now a LOT of mics) have had various results. I have not changed the default settings from the SSB firmware, but some elements pick me up from several inches away and others I need to be about about 3 inches from the mic. This is not a problem for me, I like to hold the mic close anyway, so I usually have to turn down the mic gain. Every mic element will be slightly different.

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All the elements that I have used and tested were adequate to pick up my voice with the default settings in my QMX+ and hear it well with my Yaesu FT-710. (QMX transmitting into dummy load, FT-710 has 18dB attenuation turned on and an G5RV antenna in the back yard) I have not found one yet that I thought was inadequate for the job. I did notice a slight difference when I used a "cheap" (not inexpensive cheap, but flimsy cheap) and a nice cable. The better quality cable yielded slightly better performance.