Hans, I've been wondering this for a while. What would you consider "really badly mismatched" with respect to the QDX SWR? 3:1? 2:1? 1.5:1? I have a WSPRlite with, I assume, no VSWR protection. They r

Hans Summers <hans.summers@...> wrote: It makes me wonder... do you think it would be a good idea to swap them with more powerful transistors? Not to get more power, but to get more protection in case

Folks, I am building an all-band HF CW transceiver. I am using a self-modified code version of the Sudden VFO (GQRP Club), and a QRPLabs 10w PA and QRPLabs Receiver module with Polyphase kit. The rig

No, not the antenna switch, the rig switch ! The antenna switch - an import having three positions - currently switches between the PAR Electronics OA-50 Omniangle and the 160m EFHW antennas. Connecte

When I go back and look at old messages, I can't see the attachments. Any tricks I'm missing? -- 73, Dan NM3A

At one time it was advisable not to buy a car made on a Friday afternoon, now it’s don’t allow a delivery to be scheduled for a Friday afternoon! My lovely QCX+ arrived this week but it was scheduled

Rookie kit builder working on building the 50W amp (rev 2). I'm trying to figure out if I screwed up or I'm seeing something "normal" once I put a transformer in the circuit. I wound and installed bif

Caution!!! Voltage is not the problem with the QDX, and winding T1 with 2 or 3 turns has little relevance, other than to say that 3 turns enhances the exposure. There are two built in design oversight

For those who are fans of Hakko products, or want to check them out for the first time, Hakko is having a one day 20% off anniversary sale on August 9th, 2022. Use coupon code HAKKO20, at www.hakkousa

Finishing up my "Manual Days" QRP Chinese Antenna Tuner and decided better artwork just had to happen! I watched way too many YouTube videos on ways to label front panels. I discovered there is a "bra

Hi, My QDX is nearly finished, and I now realize that all powersupplies I own give out 13.6 volts. That's a whopping 1.6 volts more than advised. I did provide for extra cooling of the BS170s, and I m

Just a tip -- I had a PSU from a Dell laptop laying around. 19.5 V at 4.62 A max (90 W). I wired it to the 50 W PA and it seems to be working just fine. PA on 20 m draws around 3 A (60 W) and peak vol

1_04C ops manual shows only three connections to QDX ver 3 but rear panel in my kit shows four connections. My rear panel has a hole for PTT but no PTT shown in ops manual. OK guys, what am I missing

I'm seeing signals from 27 KHz below 14.074 MHZ... strong Morse code signals actually (when checked on another receiver). I understand why it's 27 KHz, and that image rejection depends on the balance

Would it be possible to get a analog audio line out taps from the positive sides of C63 and C69 to run to a small audio amp for sound monitoring of the QDX? -- 73, Dan - W2DLC

I'm using WSJT-X 2.5.4 on Linux (Raspbian). For audio input and output, I use: plughw:CARD=Transceiver,DEV=0 ...in mono. And it works. Sometimes. I already made a couple of QSOs with these settings. B

Have a ver 3 QDX for sale. Works great. With case, wired for 12V. Im just not too much about the digital modes. $80 Shipped contact at n5mf at dfn . com Mark N5MF

A new chat has been created: Hi, I am suffering with the QDX power on some of the bands. Perhaps you have an idea. Here is the pwr and low pass filters (LPF) per bands: 80m - 5W - OK-LPF1 60m - 5W - O

Hans, Are the frequency limits ignored during the filter sweeps? That is, can the start frequency be less than frequency min, or the maximum of the frequency sweep be greater than frequency max as set