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It occurred to me that the Interface between the ACT08 drivers and the BS170 gates could be AC coupled. A quick simulation with 100nf and a 2k to ground on the gates shows no ill effects. The

Check all the elements connected to the VDD rail and all the places where the VDD rail goes. With some luck you will find a tiny solder whisker or a tiny part cut from an element during construction

Not so much in the moment. Maybe I will do a test using a cheap evalboard containing a STM 32. I want to check what will happen in case of VDD = 4.5 V or so. Will it stop? Yes, if not it's no proof

Eric, I do not see an order page for the mic. Dean

Stan - that was super helpful.? Thank you for taking the time to type that out for me/other hams that want to learn by doing (or by destroying). After i read the earlier post about the pin to T507 i

Hi Stan, apologies - you’re right. I mistyped when I said it jumped from 0.8A to 0.2A. The jump was from 0.08A to 0.2A, and it did freeze before I cut power. I’ll do another sweep of the boards

The USB cable is a good option to be able to use any pd power bank and not need to make a custom battery with buck converters and other kit electronics.? Also one less thing in a bag. Mine runs a

Did a search looking for this kind of assurance. I have a factory built QMX - I've not been able to use it yet - which I was able to power on using those cheap AA battery banks filled with Duracell

Paul, Take heart! Most of the things I teach to younger (and some almost at my age, 80) I learned by mistakes, misunderstandings, and just trying this and trying that. Just the fact that you admitted

Karl, I cut the cable and soldered each wire to two other 3-wire cables. Each individual wire was insulated with tiny heat shrink tubing, and finally the entire cable at that place was insulated with

That is very interesting - never thought of using a 50 Ohm speaker. How did you attach the two plugs? My experience with Baofeng mikes is that the wires are very flimsy. -- Karl Heinz - K5KHK

Hi Stan, Out of curiosity, does it complete on consecutive runs for the same band or is just, seemingly, random? After some couple of hours of messing around with band settings, I did get it do a

Oops.? My reply and comments were intended for Mehmet. I have some bands that have crazy-looking graphs like the ones he posted - even after I got them to complete all the way across.? But after

All the resistance measurements look fine, as do the numbers on your diagnostic screen capture - showing that the power supplies are working fine, without any issues, at least when you took that

Alain, Thanks for your response. I found the description of the receiver in CW mode in section 5.22 "AGC system" of the QMX operation manual (1.00_026/27). There it is described how the receiver

I've tried the "TUNE SWR" in "Hardware Test" and it works perfectly. If I transmit, PWR and SWr indications don't appear on the top right side of the LCD display. I have the "Display " option enabled

Martin, I figured my QMX+ translates best, if the keyer speed is set to the approx. speed of the incoming signals. Be it received or when in practice mode. The manual hints at some parameters to play

I think it is unlikely that you could harm any circuitry by shorting the Vbat terminals together. You could have drained your battery, if it was in for any length of time, since the + terminal could

Have you looked at this forum's wiki?? There is a topic specifically for the BS170s.? It has some helpful diagnostic guidance.? And you can search messages in this forum for BS170 and find a good

Hi, Although I got my licence over 40 years ago, I never pursued amateur radio as an interest until now. So, I was very excited this week to take delivery of my first HF rig - a new assembled QMX+.