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Re: QMX+: The trifilar toroid torture test
Nail polish works great. -- Tisha, AA4HA
By Tisha Hayes, AA4HA · #129895 ·
Re: QMX+: The trifilar toroid torture test
This is what I did with paint-pens. I colored the lengths of wire and let them really dry before using the drill chuck to make them in a bundle. It also looks really pretty when you get it installed
By Tisha Hayes, AA4HA · #129894 ·
Re: u4b not transmitting
Hi Dave and John, All good now, everything is working. Run Program does transmit while connected to USB power / Console. I figured out the HP=1 setting before complaining the outputs were still in
By Thomas VE7TOA · #129893 ·
Re: QMX+ High Current and Self Start
Further tests show poor 80/60m performance and there is a significant voltage drop compared with the other LPF’s. I set the band to 6m and found 10.47V at the switching diodes and their respective
By Damon · #129892 ·
Re: 10 watt linear HF amplifier - stability issue/question #10W_PA
Glad it’s stable. I saw similar and went round the gain puzzle It drops off at highest and lowest frequencies It reduces with low supply voltage ( I was using 13.5 V) It reduces as output level
By Bruce Akhurst · #129891 ·
Re: Winding toroids with a chopstick?
I use this method and this realy work. https://www.youtube.com/watch?v=a8ViWS61hsU&ab_channel=w2aew Tarmo K?lli ES4RTK 16.09.2024 20:45 Chris Raine W3PB kirjutas: -- This email has been checked
By Tarmo K · #129888 ·
Re: QDX and QMX+ (soon at least) what is the max safe swr?
My 4SQRP seems to make my SWR on 20M worse.? I think I can get it less that 2:1, but I finally put the analyzer on my antenna clean (no tuner) and am about 1.2:1 so I figure that is okay. Bob, The
By Daniel Walter · #129887 ·
Re: QMX PUTTY and a fault or two
Try also: /dev/ttyACM0 /dev/ttyUSB0 /dev/ttyUSB1 Of course this only applies to Linux.
By Chris - KC0TKS · #129886 ·
Winding toroids with a chopstick?
I saw this method used on a Youtube video. ? It looks to me as though the builder has created the mythical “3rd arm growing out of the middle of my chest” with this lashup. ?A vice holds a
By Chris Raine W3PB · #129885 ·
Re: QMX PUTTY and a fault or two
on my windows unit I had to open device manager, unplug and re-plug with usb devices open so I could see which com port I was on. I then turn on the QMX with the usb cable in place and launch PuTTY.
By N4uav@... · #129883 ·
Re: New Build but can’t get firmware to load
THANK YOU Tarmo! I checked that diode for short to ground but I didn’t think to look for a solder bridge there because I didn’t solder it lol. I will go over that board with a fine tooth comb when
By N4uav@... · #129882 ·
QMX PUTTY and a fault or two
Just completed a QMX, replaced a SMD capacitor I killed with the wire cutters (despite 40 years designing and manufacturing Electronics kit!!!), applied power via a variable voltage, current limited
By Lindsay Pearson · #129881 ·
Re: 10 watt linear HF amplifier - stability issue/question #10W_PA
Changing the input/output cables made the change. Now the amp is stable, the only remaining issue I have that I measure around 20-21dB gain... Thanks for the help!
By ltarjanyi@... · #129880 ·
Re: QDX and QMX+ (soon at least) what is the max safe swr?
I am running my QMX up to 2:1 without any issues so far, generally stop tuning at 1.5:1. Don't feel the case warming up. Doing only CW at this SWR though. Peter HB9EBE
By Peter HB9EBE · #129879 ·
Re: #bug #qmx QMX SWR protection not working when QSK is enabled? #bug #qmx
Adrian, some times ago there was a post from Hans ( /g/QRPLabs/message/127587?p=%2C%2C%2C20%2C0%2C0%2C0%3A%3Arecentpostdate%2Fsticky%2C%2CQSK%2C20%2C2%2C0%2C107821405 ) about a
By @Ludwig_DH8WN · #129878 ·
Re: QMX+ High Current and Self Start
I’m fairly confident in the repairs I made to the 5V SMPS and it seems to be working fine. To validate the LCD, I removed it to rule out any issues. No performance change noted. With a departure
By Damon · #129876 ·
QMX+ test ADC I/Q shows one phase missing
We finished assembling the QMX+. ?When performing the ADC I/Q test we observe no I phase present on all bands(flat line). ?Q phase looks fine. ?Looking at the possible trouble shooting issues it
By samorlando@... · #129875 ·
Re: New Build but can’t get firmware to load
I also had the same problem and the fault was on the 3.3V SMPS board. The solder had been repaired, but it was short-circuited. I used a desoldering wick and now everything is fine. Tarmo K?lli
By Tarmo K · #129874 ·
Re: QMX+ on 70MHz #4metres
Mark, A quick search for "QDM 4m" produces /g/QRPLabs/message/110602 from the horses mouth Well, QDX is pretty much the same. 73 Alan G4ZFQ
By Alan G4ZFQ · #129873 ·
Re: QMX+: The trifilar toroid torture test
Thanks, everyone. Honestly, if it had not been the end of a long day happily hyperfocused on all the tiny toroids, I probably would have figured this out for myself. My spouse also suggested
By Michael - WD0OM · #129872 ·