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Will, Note that the QCX+ rev 1 has the PTT signal on the TIP, and the others, including the QDX, have the PTT on the RING of the 3.5mm jack.? If you are using the same cable as a rev 1 QCX+, then it

Hi Wil. It sounds like something might be loading down the 5 volts. You should find a way to measure that voltage while transmitting with the QDX PTT connected to the amplifier. I recall reading a

Hi Peter, Sorry, what I meant was to use only one Grove MOSFET board, to supply 12V to the QDX when it's on. When that one MOSFET board is off, the QDX is powered by the string of diodes. Put them in

Too keep is short, QDX Rev 3 with the 1.04 firmware is providing 5 volts to the ring of the PTT cable, but not triggering the QRP Labs’ 50w Amp. ? What should I be checking? more details: - ?QDX

Hi Other WIllie, Sorry, I misunderstood, thought it was working on 30M, but on closer reading it turns out it was only for a brief moment, my mistake. OK, now we're into shotgunning the problem: As

Willie.? Yes, you can absolutely operate the switches in series, with the second switch just short circuiting the diode droppers. In that case, you would need to short circuit D3 in both of the Grove

Congrats on getting your QDX back on the air, Alexander! I use the following SWR bridge and tuning indicator with mine so that the max SWR 'shown' to the QDX will be 1:2... A fun and easy kit build

Bill, Did you check using the terminal program as Evan suggested? This would confirm a PC problem (or not). Operation manual section 4.1 PuTTy is available for Windows. 73 Alan G4ZFQ

Hi ya same name ! That's right ! - no rf feedback. I'm confident that my Bird dummy load prevents rf feedback. Also, still getting 2 repetitive blinky LED flashes which, according to the ops manual

Ken Is X6 the answer? The LPF signals are brought out, I thought to do just this sort of thing. 73 Alan G4ZFQ

I know you said there's "no RF Feeedback", but this is classic symptoms of RFI, which can be disconcerting on QDX as even brief transmissions into a mismatched load (which usually causes RFI) can blow

Alexander, Good news! Just want to mention, the diode will drop 0.7V across it in this application. This is the reason the FET is used since it has a lower voltage drop across it. This is will

On second thought, opening QDX probably won't help. Today, I'm on 30m and pwr out is 5 watts with 12 vdc at 750 ma. Power supply steady - no trips nor dips- just short xmsns ! Sure is a mystery !

Hello Al and Evan, thank you both so much for your kind replies and detailed explanations, Q7 was the right guess! Wit Q7 as a search string I greped through the archive and found the other failures

Helmut Nice work to redeem that tuner, I bought one someone had partially assembled at a hanfest for a couple dollars, just to save another person from its limitations. Try opening your original

Hi Hans, Should anyone want to know this, I figured out a way to keep the QDX tx on during a *remote* terminal tx ptt test. On my Raspi 4 loaded a keyboard programme called 'Onboard', then configured

Peter, Could you leave the diode string in-line at all times and short it out with the Grove MOSFET swich, or do you need to be able to turn all the power off at times? 73, Willie N1JBJ

Hi Richard, I have added a 50 Ohm buffer?to my VFO-SigGen (Si5351A) using the two 74LVC2G17 in parallel.? Actually four drivers in parallel.? See the attachment. It works very well for me.? In the

Design any filter online here https://rf-tools.com/lc-filter/ - 73 de Andy -

Hi Alan and Sverre, your comments inspired me to try modifying my QDX for the higher bands. I figured how to use ELSIE and came up with an LPF that rejects third harmonics from 18-10m, AND includes