Correction... a CMOS-logic-level "1" is 70% Vdd (not 60%)... i.e. in this case 3.5V. The Si5351A output high may just about reach this but due to rise/fall times the duty cycle isn't then 50%... so th

#40m #qsx

Hi all Yes it's a big difference... the modern CMOS have higher drive than old TTL (74LS). 74AC was chosen because AC is faster than HC. 74ACT was chosen because the "T" means TTL-compatible voltage l

#40m #qsx

Hello Sheldon Yes but you are asking an unreasonable thing. The QCX is not a PC with enormous quantities of RAM. It is a little processor with 2K of RAM. There is a buffer into which incoming CAT comm

#qcx #firmware #cat

Hi all Those of you reporting issues with CAT comms on the QCX, are you sure that you are using the latest firmware 1.05? There were quite a few improvements in recent releases, all around the CAT fun

#qcx #firmware #cat

Hi Shane The point is that VA and SK are the SAME THING. It is a continuous sequence of symbols dit-dit-dit-dah-dit-dah and can be interpreted as either VA or SK. Hence the confusion. It is not sent a

#firmware #qcx

Hi Gerry It was requested by Dick PA3CW, and previously, by others: "Great little rig the QCX +, very impressed. A request for a small addition in next firmware: Please add the morse character + (AR,

#firmware #qcx

Hi Brain Yes 73 Hans G0UPL http://qrp-labs.com

Yeahbut... the question is, if the QCX/QCX+ decodes it... what should be shown on the display? VA or SK?

#firmware #qcx

Hi all Many thanks to Bernhard DK5FN who has made a German translation of the QCX+ manual, please see http://qrp-labs.com/qcxp 73 Hans G0UPL http://qrp-labs.com

Hi Dick Thanks, this was requested and is already on the list. One question I have - do some people say VA and some SK or is it always the same? Is one usage more common than the other? I always thoug

#firmware #qcx

Yes, I can include the pads for SMA too.. 73 Hans G0UPL http://qrp-labs.com

#poll-notice

Hi Geoff Yes it is confusing, I agree. This is quite an old kit and my skills have improved, hopefully ;-) The schematic is labelled in a sensible way, i.e. filter IN is shown connected to the RF inpu

I had in mind that I may make a simple firmware mod that for such times when you are in trouble and forgot your paddle, the right button could be used as a key. That would also work on the QCX+ too of

Hi George The sideburns are not intentional. They're just a result of what happens when you forget that a haircut is overdue, and you have hair that somehow wants to grow a lot at the sides but not ve

#poll-notice

Hi all On the topic of BNC vs SMA preference for the QCX mini RF connector... I closed the poll since it had been open for a few days and I think everyone had a chance. Of the 5,136 members of this gr

#poll-notice

Hi all I uploaded a 17-minute segment of the recording of Saturday's ZOOM Q&A session, this segment is about the proposed QCX-mini CW transceiver. I do hate seeing and hearing myself on video but endu

Hi Halden I just measured one here, without enclosure, but including the two heatsinks: 266g 73 Hans G0UPL http://qrp-labs.com

#pa

Thanks Julian It surprises me that it was found so interesting :-) I realized later that there were lots of things I forgot to show, such as my tube collection :-/ 73 Hans G0UPL http://qrp-labs.com

Thanks guys, that's good to know... I had bought a paid Zoom subscription for the QSO Today Virtual Ham Radio Expo this weekend, so that I could host a meeting longer than 40 minutes. But now I have c

Hi Steve Thanks for the interesting idea. I expect it should work well. But I am not altogether convinced that the majority of constructors would find it easier! So far I have avoided multiple wire co