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Judging by the display, it's an N7DDC ATU-100 or perhaps it's QRP sibling, AT-U10. Good idea, I built one a few years ago from an impossibly cheap kit ($36??) and it works quite well. But I prefer my

Maybe you still have the qmx set for CW ?? Carefully see if you have rig configured before transmitting. Also vital to have bias to the microphone and your PTT set up. Curt

Replacement chip has been ordered. Thanks again for all your help Ron. I'll update this thread sometime next week when the chip arrives (darn international shipping).

You need to order a new one from QRPLabs shop. [email protected]> wrote:

Yes, unfortunately, with IC2 out, I'm getting about 6.2 Kohms. What is the process for replacing it?

Yes. The right pin of IC11 is the regulator 5v output. I measured resistance to ground on mine of over 3K ohms so something is amiss on the 5v line. Easiest first thing to check is IC2. Carefully

Ludwig, Here are my results so far IC402 Pin 9? ?394 mv Pin 10 394 mv? 40m active IC403 Pin 9 393 mv Pin 7 393 mv Pin 2 1.64 V Pin 14 1.64 V Q508 S 0 G 3.3V D 0 All measured in VDC certainly not

Resistance to ground from the +5V via next to the paddle audio jack is 120 ohms (reading from the multimeter is 0.120 kOhms, in case I'm converting incorrectly). I get the same reading to the right

Also, the blocks that are barely visible are an indication that IC2 is not communicating with the LCD. [email protected]> wrote:

Matt. I noticed all of your 5 volt readings were actually 4.7. The 5v regulator is next to the power jack and it does get warm in normal use. But you may have something giving it extra loading. Please

Hi Rob, Thanks so much for the reply! I have verified full continuity from LCD pins 11 and 12 to IC2 pins 2 and 3. I also reflowed a few suspect joints on both sides of the 2x5 header. Voltage

What do you mean the QMX+ starts pulsing? (I haven't heard that before...) Does this happen if you attach a good dummy load in place of an antenna? If you switch to CW mode and press the mic PTT, do

Careful Richard, the dual VFO display activates split mode, with TX on B, RX on A.? It is not just a display of both VFOs. But yes, the TX indicator is only seen under the 'A' VFO indicator.

Neat Frank! Like Don said...what'd you use for the tuner? -Nate N8BTR

Your display is on USB B switch to USB A or dual VFO display A & B. Then you will see the transmit indicator on USB A.

Chris, are you using a counterpoise with your antenna (a dangling wire from the 'handheld'? This may help a lot to minimize how much your hand/body and elevation of the radio affect the tuning.

Bill and Doug, Here are a few notes that may be of help to understand, measure and improve your SSB output power: 1) SSB output power is much different than CW or Digi power.? Only the highest peaks

Chris, during my last SOTA activation, I used a 20.60 m long EFHW on the MTR3B V4 for the 40/20/15 bands without any problems. ZL1TM was also logged on 15 m despite unfavorable conditions. I suspect

-33 dBm is around 14 mV pp, enough to trace using your oscilloscope. Also without amplification by IC405 and IC406 (amplification = 1) there should be enough input voltage for the PCM1804 for good

Please use Google or your favorite search engine or ai assistant with "describe PD trigger cable functionality" for details. It has a tiny chip molded into the connector which negotiates the desired