Hi Lasse, In my case of bad reception (although with Low Band QDX) I also checked first all LPFs, the RX/TX switching diodes and at the end I had to replace the IC3 MPX which was faulty. Good luck, 73

#toroid #troubleshooting #qdx

The linear regulator would pair well with a four cell LFP battery. The output of that battery will be 12.8 to 13.2 volts for most of the discharge cycle, so you're not going to be wasting huge amounts

#qdx

Hans, I too have already built my QMX. I went a step further though, I burned up a tantalum capacitor when I was messing about without it’s case on it…. Replaced the capacitor this morning and awaitin

#qdx #firmware #enclosure #qlg2 #qmx

The QRP Guys make a Z-match that I think is. Or, its absorptive in tune mode, at least.

#wspr #qdx #problem

Confirmation of reading: your message - Date: 26 May 23, 13:02 To: QRPLabs@groups.io Subject: Re: [QRPLabs] QMX built but questions #qdx #firmware #enclosure #qlg2 Was read at 21:51, 26 May 23.

#qdx #f

I agree that the symptoms indicate something wrong with the EEPROM... Is it something you can change yourself, if I send or order for you a new chip? 73 Hans G0UPL http://qrp-labs.com https://www.buym

#qdx

Thanks Hans!! I don’t mind waiting. Just wanted to make sure that was normal. 72, Harold. N8RQJ

#firmwaremake #enclosure #qlg2 #qmx #qdx

I contacted Jeff about a Rev 5 QDX that I built that would not work. I had gotten to this stage in Han's trouble-shooting guide: 22) No sign of life whatsoever. About 100mA current draw. Since I could

#qdx

Follow up: I ended up grounding the 50 W PA circuit board to the chassis by soldering a short wire to the board ground and screwing it to the back plate. I ground the enamel off the edges of the chass

#50wpa #qdx

I can speak to this a bit. John and I ran a slew of LTSpice sims with a 1-2 ohm resistor replacing L14, with and without the 0.1 uF cap, and replacing the BS170 FETs with TN0110 (or it’s 60V variant w

#qdx

I've got about 100 TIP31s and a reel of 8.2V Zeners --- sounds like a 9V regulator to me -- use what you've got is always a good motto.

#qdx

Hi All, As a follow up to a previous email, FSKONLY has been added as an experimental feature with the ardopc driver in PAT. Commit info here: https://github.com/la5nta/wl2k-go/commit/1d16f8384e68984c

#qdx

Thanks for reporting this. Mine is still wired for 9v but I have the supply set at 9.5 (power supply end of the cable). I see (into 50 ohm dummy load): 20m 4.2w 17m 3.9w 15m 3.2w 12m 3.8w 10m 3.8w I d

#qdx

Hi all, If you study the working concept Hans has chosen for the QDX frequency shift modulation, you may be able to find the answer to your question yourself. Each sine wave of the audio frequency tha

#qdx

Timothy, It seems pretty clear that the damaged circuit trace was heated by a large RF current. As that can only come from the transmitter, through Q6 (unless there is a sneaky solder bridge somewhere

#ic3 #magicsmoke #qdx

Just want to advise everyone that the fix for this was to replace the diode D7. This is the power source for the LPF band switching network. I found this diode was open. Whether it was caused by a sol

#qdx

Device malfunction - cannot get device descriptor /Jens

#qdx

Hey All, I still have an unbuilt QDX 3a, but I got curious as to why Winlink won't work on the QDX, and it's been an interesting rabbit hole to go down. The ARDOP standard does have 4FSK modes, and ca

#qdx

Welcome to the QDX owners club! Another thought or two for finals safety... Look fora thread on here,, a bit back, on how not to blow your finals... good suggestions there... one of the tips is adding

#qdx

Great! Glad you found it. On 07/05/2023 17:24, Dick Bingham wrote:

#qdx