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Thanks Ludwig, I'll have a read of those sections. Suspect I released "the smoke" last night -- likely the encoders touching components underneath, so probably try and track that down before getting

I use AWG30 solid wire wrap wire to bring out test points.? I bring the wire out in a looping arc and anchor it to a convenient spot on the board with a drop of cyanoacrylate wire tacking

Hi Donald, Your point regarding smaller diameter solder is interesting. I found the opposite building my QMX. 70% of the build I was using 0.7mm diameter 60/40 solder which ran out. I was working

Here's simple and effective idea from R2DNN.

I was able to trace down the root cause. Me. I committed the two cardinal sins of kit building. First, I added the AGC module when I was tired.? Which led to the second error. Second, I saw the

Hello Eben, you did a lot of work, sorry. No need to use 12.0 V, also a lower voltage would be ok (>= 7.0 V) and could lower the max current. Maybe the uncertainties of the results are a bit

Um, ok... Assembly manual (1.02) p3 : low receive 80 mA transmit 1.0-1.1 A p62 : When you apply power to your QMX for the first time, it is a very good idea to use a lower supply voltage than you

Charles, it depends on the type of your oscilloscope. 73 Ludwig

My first transmitter was a homebrew 15W Novice CW rig built in 1953 for about $10. I then graduated to a DX-20, then a DX-40, and, when I got my General, a DX-60. Those were great little rigs! Jack,

Thanks.? Greg Yahoo Mail: Search, Organize, Conquer On Fri, Jun 14, 2024 at 10:36 AM, dhinerman via groups.io<dhinerman@...> wrote: It should be fine as long as none of the

Hi Ludwig, PWR_ON to GND was 10.87 volts. PWR_HLD to GND was 3.1 volts. Supply voltage from my power supply was 12.08 volts. 73s, Geoff KC8FDU

Ludwig, I have not succeeded in getting signal traces with the oscilloscope.? Any guidance on methods for making the probe connections to QMX to allow hands free for using PuTTY ( T press ) and

----- Forwarded message ----- From: William Mabry <mabrywilliam67@...>To: wb4hio@... <wb4hio@...>Sent: Friday, 14 June 2024 at 04:04:30 pm GMT-4Subject: HeathKits

My time in the Heath service department was before the kits you built. I worked on DX-20, DX-40, HX-10 about 1963. My first radio was a Philmore crystal set. I also enjoyed late night am dx. 72's

I don't live far from Sedalia MO.? Does that mean I can drive of there and pick up a new, built, QMX+ ?? Hopeful for a positive answer.? :) Mark KD0QYN

Hello Geoff, that was a known issue ( http://qrp-labs.com/qmx/qmxtrouble.html ) (section "Q103/Q104 drains short on the 5V regulator board"), but for Rev. 1 boards. I think a failure at the mainboard

And, in between, I used this : https://www.radioblvd.com/hallicrafters_r274_receiver.htm

Hey Mike, I built the SB-104, HW-7, HW-8, HW-9 ET-3400, ETA-3400 ( or, was that ET-3400A ? ) . Workshop 19 ( at age 9 ) and others. Were you involved with any of those ? BTW, With the Workshop 19, I

Geoff, Could be. I had noticed that also when the shutdown wasn't working that the regulation on the 5V volt supply as shown in the Diagnostic screen was poor, +/- .3V and occasionally a red

Thanks Cliff, I did check the pin headers on the bottom of the main board make a good connection through to the female headers on the power supply boards, but I'll double check them again tonight. I