Thanks..I'll keep an eye on the S/N updates.? I'm 2211.
--
de K2TL.. since 1964

Hi All, here is a example of a period of 24 hour spots sending and receiving on 40M, on a mostly QRP-Labs setup. U3S power about 250MW to a Unun to a enfed wire. Receive antenna butternut HF9V. It doesn't get better than this. Bill KN8DMK

Just wondering what the latest is on shipping progress for the QCX?? The web site has not been updated. Thanks!
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de K2TL.. since 1964

Thank you Shirley, I will have to take a closer look on how to do that, so far I've just printed the order out and mailed it with the Check.?



-Justin N2TOH??

This is covered here

In the 20 and 17m kits C33 ( 1nF) is reduced to 150 pF for a better drive of the PA.”

And, if I remember correctly (I do not even have a QCX!) this problem was actually due to "Power Amplifier instability, solution by Daniel Ekman SA2KNG" on that page

73 Alan G4ZFQ

Digi Key will ship for free many items if you pre pay for your order+ your states sales tax by check and snail mail it in. I'd done this a few times and it's a real CYA option for those times you forget something simple.?

-Justin N2TOH?

“There was a power-on and LCD fluctuation on TX problem with the kit caused by the tiny inductors L5 and L6 . These had to much internal resistance and were replaced by bigger types with 47uH.

Jerry,

This is covered here

I would suggest you take care if you do any other "unofficial" modification.

73 Alan G4ZFQ

In the 20 and 17m kits C33 ( 1nF) is reduced to 150 pF for a better drive of the PA.”

Looking at enclosures I noticed that PD7MAA suggests changing c33 to 150pF for 20 meters or 17 and putting in lower dc resistance inductors for display stability:

“There was a power-on and LCD fluctuation on TX problem with the kit caused by the tiny inductors L5 and L6 . These had to much internal resistance and were replaced by bigger types with 47uH.
In the 20 and 17m kits C33 ( 1nF) is reduced to 150 pF for a better drive of the PA.”

Has anybody else tried these and can you verify that they are advisable?

Thanks
jerry aa1of

I have testing with 100?h inductors,the résults is the same

Joel,

It seems to me that IC2 is not starting up properly.
You have checked all the voltages on the LCD?

If that is so then please contact Hans, he does not seem to be reading this topic.

73 Alan G4ZFQ

Le 12/12/2017 à 16:04, Joel Fournol a écrit?:

hello Alan i have 20mhz good and 27mhz good thanks for your hep today i have receved encodeur sending by Hans but receiver is shudown just bf running

unfortunately the display is illuminated but the welcome message of the version does not arrive the bf either I turn off, I turn on , still nothing, I act on r27 the contraste works with these white rectangles,

,

And you do not have this problem?

ok

this measure is very interesting

and it is similar to my feeling,

but i have no? possibility yet to measure phase noise closed to carrier

best 73

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okay I did a lot of reading of the manual - but this is still not quite intuitive.? must I set the QCX for WSPR operation before plugging in the GPS?? could this alone (along with an open circuit on the antenna port) explain why I nearly had smoke coming from the QCX when I attached the GPS?? not sure I have plans yet to use the QCX on WSPR - but since I installed a connector for the GPS - I am curious enough to get it working before I put the QCX back into its case (it was out to install L5 for the mod).?

just in case I decide to do WSPR - I should look to see if I have a metal slab to install as a heat sink - I remember doing this once on a rig - maybe the Fort Tuthill - where we used a thin layer of epoxy to attach it?? anyone else have a suggestion to improve thermal??

someone seriously needing to use the QCX for WSPR might wish to implement a drive control if it is possible (or reduce the supply voltage).? curious if anyone has done something here.?

enjoy your radiations.?

Curt

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F1US,

Dave has a nice operational review on his YouTube channel.?

and has the guts to have us watch him use it in a real QSO!?

Good job, Dave!

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Thanks for the tip guys. I just moved a L5 and went back to check. Open! I have a bin-full of 22uH so put one in as a replacement. Will see how that goes!
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Wes

AE6ZM

Hereford, AZ

?

Thanks all for your reactions. I have built my QCX for 30m. The fact that its output power is higher on 40m is unintended and not the result of some sort of deliberate compromise. My new LPF should be OK if you look to the PDF file: -3dB @11.3 MHz, and already virtually flat at 10.170 and lower. So the transmit behavior - gradually increasing output with decreasing frequency - is likely not the result of the LPF. I hope Steve, MW0KST, will conduct his experiment with L4 any time soon. Very curious to see what will happen.
--
Regards/73,

Enno, PF5X

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