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That's a good call Roger.

Hello Carl.

Have you tried a reboot of your PC after installing the libusb.dll.

Also, are you selecting the arduino from the Avrdudess drop down menu.
I'm assuming that you have flashed the arduino isp sketch to the arduino.?
And are you selecting the correct com port to be used with the arduino as the programmer.
Can you see the arduino com port in your PC device manager.

I've always found zadig a useful tool to install peripherals like the arduino etc to the PC to be used with Avrdudess too.

Kind regards, James.

Are you sure that your power supply is sufficiently robust? I had a similar problem with my u3s; changing the power supply fixed the problem. You might try putting a 4700uF cap across the power and see if it helps.

Roger
G3YTN


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Sent from my Android device with K-9 Mail. Please excuse my brevity.

I am looking for help installing firmware on my U3s. I am using Arduino IDE as the ISP. Also using Avrdudess. I had a hard time getting the libusb0.dll installed but now have it in the two windows folders per instructions, I now don't get an error starting Avrdudess any more, However, I do get this error massage from Avrdudess,,?

avrdude.exe: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00
avrdude.exe done.? Thank you.

Now I am lost. Can anyone help me with this problem?? The U3s reboots every time it starts to transmit. I tried? a restore with the same results. Carl

Steve,

Changing QCX CW OFFSET has no effect on the filter center frequency or bandwidth.


Brady,

Assuming you bypassed the onboard filter (discussed above) there is no reason QRP Guys filter will not work unless their input impedance is so much lower than QCX PHONES jack is designed to drive.

72, 73
John
N3AAZ

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It shows how to adjust the cw offset, so i was wondering if that also changes the filter(s) peak frequency.

Have you watched the video? Hans does not appear in this video, nor is there anything about how to adjust the filter. ??????

John,?
Thanks. That's probably more involved than I'd like to get, but I ordered one of the $15 CW filter kits from QRP Guys and am going to try it off board. If it doesn't work, I'm not out much! However, I am also bookmarking your note above in case the kit doesn't do the job. So, thank you for the guidance! ?

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I got hooked on radio about 63 years ago when i found a lovely crystal set that my father had built in a miniature cigar box. Wish i still had it, just perfect for a QCX.

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I wooden expect it anytime soon!?

So when is the ARRL or RSGB going to bring out "Practical Woodworking for Radio Amateurs" ? ;-)

I'd buy a copy !

73 de Andy

Arv
This subject seems to drift off thread so I'll limit myself to just this reply.
Setting up a new ref station for a DGPS service would be an interesting project. To whit, getting a new station with an ten-fold improvement in accuracy AND regularity, licensed, working and on the air/active.

The DGPS services available on LF in the USA require a dedicated decoder, as far as I know and have experienced.
Are there any free solutions available?

And are there any other generally available services, and associated decoders, in other countries? I throw this question out to a wider circle.

We're using the QLG1 to regulate a transceiver frequency and synchronise it for WSPR transmissions, small variations of Lat, Long, and Height are of little importance but of great academic/radio amateur interest.? (I wanna fix it! Is it broke?)

?

Brady,

Audio filtering in the QCX is fixed and way too sharp for my CW and WSPR pleasure.
I built several outboard audio filters with great success.

Take? a lQQk at this site
?http://www.bowdenshobbycircuits.info/opamp.htm
Drop down to? "2nd Order Opamp Filters" where there is 200 Hz math? example then plug in your pleasure.

I also have first hand experience here...
>>>>http://www.circuitstoday.com/band-pass-filters<<<<
I plugged these? math equations into EXCEL
then built several BPF and variable band pass
THAT WORKED FIRST TIME.

With an outboard audio filter...
You will need to bypass the QCX onboard audio filter:
Locate R27 and R29.
Lift (unsolder) the leg of R29 that connects to R27.
Lift (unsolder) the plus (+) leg of C21.
I found it much easier to cut the trace between C21 (+) and IC9A (pin 1).
Solder a jumper from the now open pad at R29 to C21 (+) pad, then
plug your outboard filter into the PHONES jack.
Note sidetone and volume work just as before.
If you re-run the alignment procedure ...
you must realize the test results were/are based on the onboard filter installed.
I suggest re-run the procedure with the outboard filter just to feel and hear the difference,
I like it and think you will too!

If known mod of C22 not installed yet, replace C22 (10uF) with (0.1uF).

72, 73
John
N3AAZ

I believe if you watch Hans video it explanes the filter settings in the later part of the vid. Carl
https://www.youtube.com/watch?v=_Y89tMETDsQ

Came out really nice.

Wood is good!
I have three radios and a laptop(Rpi) in wood cases.? Couple of things.? Michaels,?
AC Moore?and others sell wood boxes hinged lids, same for Amazon.? Some are
pretty neat and strong and?almost any finish from camo to steampunk is easily done.

Most of the same places sell "aircraft plywood" with thicknesses from 1/16 thick to a?
very solid 3/8ths inch.? With this material any sort of box or panel inside one can be?
easily fabricated.

It is a minor thing to line the inside with aluminum foil tape if shielding is desired.


Allison

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Hello, I have been operating this 40m QCX radio for a week or so now, making some nice contacts (mostly 300 to 500 miles during the daytime) and have a few questions about its operation:
1. Is there a noise reduction function on this radio? My ears have become spoiled by NR on my other radios, and I guess I view it now as close to a necessity. Is there a NR feature? If not, is there at least an attenuation function? Preferably an attenuation that can be easily adjusted on the fly, like, during a QSO, without digging deeply into menus?
2. Filtering. I read somewhere in the manual that the filter is set at 250 hz, but is there a way to dial it in narrower (see above comment about my having become spoiled by modern radios)?
TU and 73,
Brady KD8ZM

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Beautiful Job!

Attaching pics of my retro 1930-style QCX case for 40m, completed yesterday. Wood is a viable alternative for those who like to putter around with tools.?
All controls and hook-ups are on the PCB, except for the power jack and the two push buttons. Works very well, and has the old timey radio look I was looking for.
Naturally, it won't work if you are looking for a space-age high tech look. lol
Many thanks to Jim W7EED for his help in thinking through my volume control issue, rig works perfectly and have made some nice contacts.
73,
Brady KD8ZM

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Have a GREAT Day

Tom KS5X@...