Re: Russian Woodpecker??
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Re my QCX 20M tcvr: I killed the Woodpecker!! Switched the Schottky (D3) and the 1N4148. Then went back to checking the IC 9 voltages. They were still out of whack. As I mentioned before, when I pressed on the IC I got a “chirp”. On very close inspection I could see that one of the pins appeared cold-soldered. I re-soldered the pin and BINGO…..The tick-tick-tick Woodpecker disappeared and the alignment tone was stronger. I’m not happy with it yet because comparing it to another QCX it should be a lot stronger. I’ll go back through the tuning again and see what evolves. I will also re-check the other ICs.
From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of KeithP
Sent: Saturday, February 26, 2022 8:44 AM
Subject: Re: [QRPLabs] Russian Woodpecker??
Russian Woodpecker find:
Given the weird voltages on IC 9 (QCX 20 M CW). I decided to take another look at the components. Ahahhh! There, I discovered that I had placed D3 (1N5819 Schottky) where D5 was (1N5148 Switching diode) and vice-versa. I’ll reverse them today and see what that does (with the hope I didn’t damage anything else. Prior to finding this, all the functions on the LCD were working fine.
From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Ronald Taylor
Is this a QCX Mini Rev 1 or some earlier model like one of the QCX Classics or QCX+? 1.08 is a very recent firmware version that is backwards compatible with all the older models of QCX. Reason I'm asking is that the Rev 1 Mini had some issues at times with bad op amps that was corrected in later versions with different parts and factory testing of the board. QCX+ and QCX Classics didn't have many problems with op amps ... Thanks .. Ron
On Thu, Feb 24, 2022 at 12:54 PM KeithP <salmo@...> wrote: