On 14/11/2022 14:26, Mitch Winkle wrote:

Anyone seen this in Win10?? Chronic failure on USB being plugged in.

Chronic? That depends, normal if you do not power cycle the QDX.

73 Alan G4ZFQ

Hello Mike

Just building a 40m QCX mini.? Fitted T1 this morning along with LPF components out of sequence to ensure I could check out the completed filter before doing anything else,?having experienced an issue on a previous project caused by a wrongly marked capacitor.? Sequence is whatever is convenient for the builder - just check you haven't got too many bits left over at the end!

I fitted L1 to L3, then checked them out for continuity before fitting C25 to C29.? I didn't cut off the leads from C25 and C29 immediately, but used them to tag onto 2 flyleads made up from a couple of inches of RG174 with SMA and BNC connectors respectively. I keep them for that purpose.? Saves getting solder in any hole I need later.??

Plugging in the nanoVNA says the filter looks fine, as expected.??

Just finished the 1300Z QCX QSO party session on 30m, cut short by blown fuse, so having fixed that, soldering iron on and back to the QCX mini.

Good luck with yours.

Chris? G4CWS

Anyone seen this in Win10?? Chronic failure on USB being plugged in.

Hello all,

As the mains ground system is heavily poluted by all kinds of noise, I have always been using
a separate radio ground in the garden. Especially using any kind of end-fed antenna, this will
help to get rid of mains related noise issues.

If regulatory issues don't allow a separate radio earth, a balanced antenna is called for. A 2
x 7.5 meter long dipole with open feed line and a tuner will work wonders on 40 through 10M. I
am using 2 x 16 meter, 12 meter long open feeders, good for 80 through 10M and with the end of
the feed-line strapped together it will also do 160M, albeit you need a few radials for that
band. With a proper balun followed by a suitable auto ATU, matching the antenna on all bands
is very well possible. That's how it works here. As a bonus, noise issues on receive are far
less.

As said before nothing will help against a direct strike, yet voltage buid-up on a wire
antenna by distant thunderstorms is impressive. I have often noted flash-overs between the
vanes a a wide spaced tuning capacitor. A solid 100K resistor between the two wires of the
feed-line will take care of that.

73,
Roelof, pa0rdt

Wonderful, Hans...thank you !
Of course, I want my new assembled 20, 17, 15 ,12, 11, 10m QDX built & tested for 12 volts. I don't mind a few dB less power when I operate the QDX at 9 volts max !
72 / 73,
Bill, N4QA

My 1300Z session:
I started on 30m with a?nice QSO with SOTA station DL20SOTA, operated by Mario DJ2MX. He was using a (tru)SDX with 4W into a linked dipole, and came in with 579. I used my 20m QCX on 30m, I got 559 from Mario.
After that I worked the usual suspects ... DK3UW and OK2BQN, both with QCX.
Also tried 17m, CQ'ing for over 20 minutes, but no luck there. Finished on 60m for 5 minutes, but also nothing there. More luck at 1900Z I hope.

73 de Luc - ON7DQ

On 11/14/22 07:41, Bryan Curl wrote:

The only lightning protection system that works for me actually costs nothing. Disconnect. That includes disconnecting from grounds as well. Don't ask me how I know,... twice.
Rf grounds are a different conversation I hope to learn more about tho there are reams of articles and opinions and theories about it on that www thing.

Yes, many theories and some good some bad (lot's only half explained).
Example, ground loops:



The point them out and mention a 'single point ground'. But if they're
ground wires are long then they still have ground loops. Basically
it has to do with 'there is no zero ohm wire'. They do mention that in
the second floor ground problem.

To sum up what I've read so far. RF grounding is a myth. There are
only two type of Grounding; AC and safety. Oh and you need to deal
with RF grounding. Good news I have lots of examples of folks who
deal with real grounding issues (commercial radio, FAA, & NASA).
Hopefully that will get past the contradictions.

Right now I'm having a ground loop problem in my brain. ;-) I'll need
some time to all absorb this. My first antenna won't arrive for a
month so I have more time to figure this out.

--
Linux Home Automation Neil Cherry kd2zrq@...
Main site
My HA Blog
Author of: Linux Smart Homes For Dummies KD2ZRQ

Thanks Donald, Dennis - exactly what I needed! :)

73

Terry

Bryan,
Actually, it does cost something: time and convenience.?
--
73, Dan? NM3A

I have had two lightening related failures over the years. Both were due to induces currents from nearby but not direct strikes. One was a TNC II (from TAPR) in the 80's. From the failed parts, it appeared to travel in on the GROUND line. The second was a laptop a few years ago. It came in through the telephone line, not the power.?

Although I don't follow this practice, total disconnect seems to be the safest route to go.?
--
73, Dan? NM3A

The only lightning protection system that works for me actually costs nothing. Disconnect. That includes disconnecting from grounds as well. Don't ask me how I know,... twice.?

Rf grounds are a different conversation I hope to learn more about tho there are reams of articles and opinions and theories about it on that www thing.

--
regards,
Bryan, N0LUF

I have a (cheap) USB cable that recognizes my cell phone and my programmer (in Windows), but the data transfer only works with the mouse or keyboard.
73 Reiner

Just to add one other idea to the mix, have you tried a different USB cable? Although they are fairly reliable, I have had at least two where the wires have fractured internally.

73, Alan, M0PUB

开云体育

Mike,

Mike,

I did that for the LPF's, see my blog

Note that I built an older version, and used manual V 1.05, so things may be different for your version.

I didn't bother for the BPF since this has quite a wide tuning range, and has the built-in adjustment procedure.

Even when you get the LPF's right this way, you will need some fine tuning, since the output class-E finals are NOT 50 Ohm, so the measurement/adjustment? with the NanoVNA will not give you the optimal point, but it should at least reduce the guesswork.

GL with the build
73
Luc ON7DQ

On 14/11/2022 03:33, ANDREW STEEN wrote:

I connected the usb cable and turned on the QDX.? The red led flashess rapidly then goes steady as it is suposed to.? My device manager does not pop up with a new port.? Also WSJT-X does not recognize teh QDX at all either.

Andrew,

Have you tried all available USB ports?
A hub?
Another computer?

It is unlikely to be a fault in the QDX but it will help to be sure of that.
Note that all you need to do is look at Device Manager, the QDX should show as COM port and an audio device.

73 Alan G4ZFQ

Hi Fernando,
I suggest you update your QDX firmware. I think there was an issue with audio gain settings in earlier versions.
73 ken g4apb?