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Re: QMX Hi Band Noise Problem
Mikael, Is your radio factory assembled or a kit? JZ On Sun, Mar 31, 2024, 8:08?AM Mikael (SM7UDB) via <sm7udb=[email protected]> wrote:
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Re: ARRL Technical Innovation Award.
FYI??must be received at Headquarters by March 31. Additional support information must be received at ARRL Headquarters by April 15. Don't worry about address, phone number, and email. He has been previously nominated.? You can just list his call G0UPL ------ Original Message ------
From "John Baines via groups.io" <jbaines@...>
Date 3/31/2024 6:36:32 AM
Subject Re: [QRPLabs] ARRL Technical Innovation Award. I am in the process of nominating Hans. |
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Re: ARRL Technical Innovation Award.
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Re: ARRL Technical Innovation Award.
John,
The nomination already exists. Just email Steve Ewald (sewald@...) to add your endorsement. 73. Rowan. G0KLH. |
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Re: ARRL Technical Innovation Award.
开云体育I am in the process of nominating Hans.What should I use for his address, phone and email address - his QRZ entry seems to be out of date. 73 John M0JBA
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Possible short? QMX 20-10 Rev 3.
Before I add the BNC connector I am measuring a short between the BNC centre and ground. I suspect this is not correct but I'm not certain?? Is is possible this was caused by the neigbouring transformer T507 which was the last addition?? I'm not sure how the transformer works so perhaps the short is meant to be there?? Hesitant to proceed without mention of this in the manual so I suspect I've created this somewhere. thanks all Scott |
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QMX No Power On -- I Hear a Click But NO USB Link to Computer
Sorry to bring this up, but I've seen threads with no solution.
Having just completed what I thought was a very careful build of the QMX, I get no response other than a clicking sound both when I plug in the power cable, and when I depress the left pot. Tried two brand new USB C cables, and the computer doesn't recognize the QMX so I can download firmware. Screen is totally blank at this stage. Any ideas gratefully appreciated. Bill? W3WJ?? |
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Re: Bricked my QMX?
Hi Don.?
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Just to be sure, you had mentioned that you had been using your "standard 12v supply" with your QMX. Does that power supply provide exactly 12v??
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The reason I ask is that my "standard" power supply I use for my home based QRO rigs delivers about 13.8v, which is too much voltage for the 12v QMX!?
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73de Roy - KI0ER Littleton, Colorado USA |
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A “Must read me First” reference for QDX/QMX users
In my quest for understanding “What the %#@&?am I doing!” while Googling about the Internet, I came upon the following resource that most (perhaps all) users of the digital modes (Using the QDX and QMX in particular) will find quite worthwhile.?
There are a half dozen additional (mode specific) papers by the same author (ZL1BPU) which may be equally informative and useful as well. I haven’t yet, but will likely be reading all of them.? With 5-band WAS/WAC and DXCC completed on my QDX, I’ve burned out on FT8… It’s tme to try for some digital rag chews. :-) ? -- 72 Gary, N3GO |
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Re: 50w QCX amp with grounded ptt (elecraft k2)
W8DIZ “Diz,” from Kits and Parts SK, R.I.P had a really cool way to do this-
Use a 78L05 regulator tied to the amp B+ in (~22V in the QRP Labs case) Tie the output of the regulator to amplifier PTT (5V active high) Connect the gnd pin of the regulator to the PTT circuit of the rig.? So when the PTT provides a ground to the regulator, it switches on, and 5V is used to activate the 50W amp. I used this idea to build a 50W amp and one of Diz’s 5Watter rigs together in a case. At 12V in, it makes about 25W, and runs cool. Larry KB3CUF? |
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50w QCX amp with grounded ptt (elecraft k2)
Hey all,
I suspect this has been asked and answered, but I cannot find it. I have an elecraft k2 with an amp keyer jack that is an open drain output and is pulled to ground during transmit. I would like to add the QCX 50w amp. I understand what it required electrically, but I'm curious what the most practical way to connect the two would be. Is there a way to tap 5v off of the amp, so the keyer ckt can be passive? I'd like to maintain QSK capabilities. Thanks in advance, Casey KV3T |
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New Chat: QCX revision 4 build problems
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A new chat has been created: Hello, By: rvsjimbo@... Do not reply to this message to post to the chat. You can participate in chats only through the group's website. |
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Re: Inexpensive Scope for Troubleshooting QMX
Michael, An oscilloscope will be a great addition to your work bench. A quality instrument should serve you well for decades to come. My Tektronix 2465 has been a great performer for me for 30 years now. While you are shopping/deciding, consider another little tool that will also prove to be extremely useful to you. A simple RF voltage probe that attaches to your DMM can be purchased as a kit for about $15. A perfectly suitable one can be made from junkbox parts. Consisting of only a capacitor, a resistor and a diode, it is a very quick project? but very handy to have in the workshop! JZ On Sat, Mar 30, 2024, 9:04?PM Gary W9TD <w9td@...> wrote: I have a Tektronix 485 which WAS the hot scope at the time. I still use it when my Siglent 1202X-E is having problems with the signal. I also have the P9201 900 MHz FET probe for much less signal loading than the standard probes. Needs to get power from the 485 which has two power jacks for just that. |
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Re: No CW sidetone on QMX
Now today, no sidetone on CW! No power out indication.
Found it! Works into dummy load! A..ha! SWR protection on, antenna gets out of tune when power off, xmt and transmitter shuts off, "S" shows between last freq number and DIGI/CW and all you get is clicks. Tune antenna, reset protection or turn off and VOILA! Sidetone, power out and S-meter! Okay. I got this! 73 Karl KI4ZUQ |
Mark K9TR
Karl