Dear John and Luc,
Thank you for your feedback, I dug a little more of this problem and I found :
Unfortunately, I am camping for vacation… so I will test it later.
73, Nico
I bought a kit for 30m in early January 2021 as a pre-order. It was well worth waiting for and I really enjoyed building it; Hans’ instructions are so clear and well illustrated. The CWpractice mode worked really well and helped me to send characters with consistent spacing. I bought kits for 17m and 80m and having built the 17m one used that for practice too (for travelling mostly). Unfortunately that is all they have been used for and I have decided that if I can not progress with CW during Covid lockdowns I will never progress any further 
I therefore have for sale a 17m QCXmini fully working; a 30m likewise; a kit QCXmini for 80m; a working GPS module for frequency trimming and a mini dummy load.
These will eventually find their way onto ebay but I offer them here first so the “selling fee” can be donated to SOTA funds instead of corporate wallets.
Please don’t respond here - PM me to negotiate.
73,
Rod
Sorry to hear that you find CW is not for you Rod. I would say that CW is massively rewarding if you can stick with it, although I do recognise that it’s uphill all the way, I have to fight hard.
The QCX kits can easily be converted to other bands, there’s not many components to change and they can be purchased cheaply. I would be interested if I didn’t already have 5 QCXs!
73, Colin
One of the big problems is it does become harder to learn stuff like CW as you get older. It’s easy when you’re a teenager and gets slowly harder as you age. It’s why you find people who could use it when they were young have less issues getting back to speed when they’re 60+ than if they start at 60+. It’s all in their heads and needs unlocking as opposed to try to fit it in.
Such a pity…
…2 weeks too late: …Yesterday my 3rd QCX Mini kit arrived … after one for 17m and 30m this one is now for 60m. And that’s all I really need.
It really is a great little TRX
73 Armin
Regarding the harsh tone… the volume button helps.
Have ferrites on almost any cable being connected to the rig.
But still strong stations amplify the effect.
4 QCX built with very different effects
Currently around 1100 QSOs in the last 8 month with the QCX.
QCX for 15m to be built soon
73s
Ingo
In terms of number of components that’s true but having changed the band on a QCX Mini I wouldn’t describe it as easy. The problem I found was the de-soldering and being able to clean out the holes in the PCB. Using a spring loaded syringe it wasn’t too difficult for the toroids but a couple of the capacitors were very difficult to reach and I ended up having to remove another component in order to get the clearance needed.
In hindsight it might have been worth trying a different approach and cut the capacitors off leaving short stubs attached to the board and attach the replacement capacitors to these. It wouldn’t have been very mechanically sound but probably good enough.
Hi John,
What I meant really was converting an unbuilt kit, I didn’t make myself clear.
I did PCB repairs and rework for about 10 years, so re-banding a QCX is not too bad for me. I changed my QCX-30 to a QCX-20 for the EU-NA S2S event a couple of years ago. I’m considering changing the band again, LOL.
73, Colin
I agree, it just needs a few different capacitors if building a new radio. But converting an existing set isn’t easy without the right kit as I found. I probably wouldn’t try it again! 
I’ve rebuilt a QCX mini from 40m to 17m and I don’t think the tracks would survive another going over.
It might be an option to get another enclosure and use a small bit of it as a physical extension of the QCX. Then move the filter into this part… then multiple changes will be possible.
But as the QCX comes at a very reasonable price it might make sense to buy another kit and support Hans.
73s Ingo
I received my 3rd QCX mini (for 60m) a few days ago. I have also ordered the AGC option… and at the same time two AGC (with the firmware upgrade) for the two QXC mini (17 and 30m) that I already have.
Have any of you already retrofitted the AGC option?
Did you then solder in the bridge for a permanent AGC?
What experience have you had with this?
73 Armin
Hi Ingo! For 15m could you tell me the values of the toroids and/or components?
73, Takeo
Hi Armin,
did install the AGCs for QCX v2. There is an error in the handbook (Dec. 2021).
Edited: AGC Manual (Dec. 2021) on page 9 the AGC connection is wrong. For the right connection see page 11 photo at the bottom of the page. If you implement the description from page 9 you won’t be able to switch the agc.
If you have questions get in touch.
In the new firmware(1.08) you can switch the AGC on and off. I think it was in the Menu at “Other”.
For v3 it is easier as you do not have to solder bridges through the PCB.
[added 24.02.2022] There is a new version of the manual where the error was corrected, see http://qrp-labs.com/images/agc/manual_1_01.pdf
Always look for the last version of the manual!
73s
Ingo
Hi Takeo,
have not received the kit yet. Waiting for it. Hopefully this week to arrive.
Will let you know as soon as I have the info.
It would be fun to have a S2S and QCX 2 QCX QSO on 15m with Japan.
73s Ingo
Wishing you success in the project!
73!
Thank you Takeo!
73s
Ingo
Hi Takeo,
the details for all filters can be found here:
It is for another kit but are similar to QCX.
You still need to measure the inductances after winding them.
Sometimes the values can vary depending of the quality of the toroid.
Somebody wrote that reducing T1 with 1-2 windings (when taking the values for 17m as a starting point) might be helpful.
As the 15m QCX is not an official product, it might be helpful to experiment.
In case somebody build a QCX or QCX mini for 15m, please post the values of the 15m here.
Somewhere in the Internet there is a website where you can calculate similar filters.
e.g. see next message…
Very much tempted to recalculate the filter in a way allowing 15m and 12m through.
Hans recently wrote that he is currently experimenting with new bands for the QCX including 15m.
73s
Ingo
Don’t overlook the button at the bottom to choose between exact/standard value and the tolerances for the C & L components …
73 gl, Heinz
Thank you!
73s
Ingo
