Update: 32 bit STM Driver install FAILED and said "install 64 bit Driver" (HP Pavilion ((64 bit)) Athlon II). Installed W7 64 bit STM. QDX is NOW shown as Sound Card device (see screenshot). That is

David, I had a problem with my QDX V3 similar to yours. There was a problem on transmit on both the 20m and 30m bands. In troubleshooting I measured 1.8 volts on the LPF_3 line when 20-30 meters was

To get more bands visible increase the txs parameter in the menu to say 6, ser start to 00 10, this will give you a wspr tx every 10 minutes 6 times an hour. Andy -- The universe is made up of

Hi Jim, For both the T1 and T2 the clockwise direction is fine. If you look again at p. 17, you could also imagine the clockwise winding of T1. 73 Bojan S53DZ

A week ago I measured the power output of my QDX. https://www.ph2lb.nl/blog/index.php?page=qrp-labs-qdx -- 73 Lex PH2LB https://www.ph2lb.nl/

V=IR or in this case if the TX current is 850mA and the resistance is 4 ohm - .850 x 4 = 3.4 volts drop Graham ZL1CE

Howard, The driver is not installed. There are instructions on the QDX page, here is my updated write-up https://sites.google.com/site/g4zfqradio/qrplabs_qdx#h.9wnyb1jprmjc 73 Alan G4ZFQ

I'm getting "USB Device Not Recognized" & "Unknown Device," but it says that my drivers are up-to-date. I've switched cables, USB ports, turned OFF/ON, ON/OFF, re-started WSJT, etc. It powers up OK

Start is the EVEN minute that you want to start TX, Frame is how often in EVEN minutes between TX....... you do not wat to TX every two minutes....... for long runs 10 minute Frame is good for

Mark I had the same problem, ran out of winding wire. Jaycar sell small reels of 0.3mm 28BS wire and I used this to complete the build. PM me off list if you would like me to send you some if you

Well I fell into the dial frequency trap. I’ll change that today. I bet that’s the issue because I do have output I can see from another radio. I do have the GPS module installed for timing. So

For a standard toroid (NOT "torpid") transformer, wire size and characteristics don't matter. They just need to fit on the core. For transmission-line transformers. wire size and especially wire

Mark, As I understand it, the wire size shouldn't change impedance or inductance for that matter. Actually the smaller wire size might give you more range if you want to expand/compress turns in a

Paul, Thanks! What's the best way to make a directed call to another @QDX station? Out of the blue I sent a @QDX SNR? transmission, got no replies. I haven't used JS8Call much and never used a

I have added the @QDX group but not yet encountered another @QDX group member.

Al, Thanks for the very kind offer, but the post delay is actually between Sydney and the “the bush”, not so much the rest of the world and Sydney. It’s no problem me ordering some 0.33mm, I’m

Page 17 of the 50W HF QCX Power Amplifier kit assembly manual shows T1 wound counter clockwise and page 18 shows clockwise. It fits on the PC board fine when wound clockwise. Most all QRP Labs coil

One other potential gotcha with WSPR is the frequency you transmit on… you must program the U3S for the actual frequency and not get caught out by the “dial frequency” (like I did!). So for 20m

Indeed, a desoldering iron will desolder and leave a clean hole free of solder in no time.

I tested them in circuit but did not trust the results. You motivated me to remove the BS107's and test externally. Sure enough, the last one I tested was bad. Replaced it and am back up to full