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
·
|