Hi Christiaan, Many thanks for your interest and feedback. Indeed R44, R45 & R46 needs to be placed and somehow these components got accidentally wiped from the layout. It is corrected now and you

Well, in case anyone was curious, I threw the 470nH inductor at it, and used a small pot dialed down to 10ohms. It established GPS lock with the external antenna without a problem.So far, so good.

Sold both pending payment to N2JJ. Thanks for the response.

Hi Kuba Very pleased that this helped you. My QCX was OK in Practice mode, probably due to doing the mods the values of C21/22, only exhibiting the terrible click/thump when producing RF, as you say

Hi John. I’ll take them both. Send me payment details off group. Andrew K6STN Sent from Mail for Windows 10

Reg thanks for the note - no I won't ask you to plug the TR line into the key jack to see if that is my problem being killing my QCX. all I can think of to do, while waiting for new QCX IC, is to see

17 Meter QCX puts out about 2 watts. $35 shipped.USA 20 meter QCX non working. Well, it does program but the noise level is awful. Doesn't seem to have any output and cannot hear signals. Rewound

Hi, Just a though although it might not be relevant in this case... When I built and tried the amp it had no output. I was using a separate transmitter and a 5 volt DC supply to turn on the amp. The

Curt 3 watts with or without the amplifier would seem to indicate that the amplifier may be the problem. If this is true, then driving the amplifier with some other signal source could be an

Arv good advice - my objective at the second attempt was merely to see if I got the same result - I did not. [so I came up with the only explanation I could think of that could be different ...).

Holy smokes! Great piece of innovative work, Ron. The user interface for that scalar network analyzer is also PC-based ... it's a pretty big chunk of Python code (not mine ... although I did do a few

Curt The schematic is your friend. Use it to follow power leads, ground connection, and signal paths. Was your QCX operating properly before you tried to add the amplifier? If you disconnect the

Nice Bruce. I would like to see some other Arduino Shield projects. Here is one of mine. It uses a bunch of QRP Labs kits: Arduino Shield, Si5351, Relay switched Module, Low Pass filters, Receiver

You did say in a previous post you saw the red light on the amp come on when you keyed the QCX, so it was OK at the time.

If the TR cable from the QCX went into the Key jack of the QCX that would damage the QCX. The AMP if it was on it may be ok.

okay - I can only think of one thing that could have been different on attempt 2. same PS, same cables, power pole and coaxial - so polarity was correct. possibly only one thing may have been

Yup, that is what he said. Thank you Hans. I would only add that I was surprised how many counterfeits components are out there! For transparency purpose, I do not receive any compensation from

Thanks for this finding! Yes, this can certainly participate in click generation, however (at least in my case) this was not the main reason. 12v rail is mostly affected when lot of current is being

Hi Guido. I'm following the thread on QCX/SSB with great interest and yesterday ordered an extra QCX-kit (QCX kit #7 in this shack:) )so as to implement R1.01x. I studied the various files coming

Minor correction... I think what I said was, in summary, if you order IRF510s from Amazon or eBay or AlliExpress etc you may or may not get real IRF510s; the danger is you may get some generic TO220