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Just out of interest, I modified my FT-897 bluetooth dongle to fit the USB A-B lead connection to the QDX. However, although I could pair with the device and two basic serial COM pots were allocated

Hello Team, I got QDX 12Volts version. Using 50 ohms dummy I?measure: 4.5Ws on 80m (850mA) 5Ws on? 60m (930mA) 5.2Ws on 40m (1A) 5Ws on 30m (970mA) 1.5Ws on 20m (470mA) (not a very precise PWR

All items have been sold - thanks.

Using 3s lipo batteries, just over 12v. Tried 2 sets and same behavior.

Hi Nico. It sounds to me like you are getting an oscillation in one of the audio gain stages. Please measure the DC voltage on pins 1 and 7 of ICs 5,6,7,8,9 & 10. Those might point to the general

Pim, Under the fault condition I think about +20mA has been mentioned. And receive has been reported as very poor, audio very low. 73 Alan G4ZFQ

I won't be getting to these projects. QCX-mini (Rev 3) ( http://www.qrp-labs.com/qcxmini.html ) for 20m ( *no case* ) - $45 Two U4B balloon trackers ( http://shop.qrp-labs.com/kits/u4b ) - $90 for the

By following the instructions in the manual you will not be " fixing"? C41. Without the the modification the junction of IC9B-5, C74 and R37 is grounded. Physically that occurs at the grounded site

Hi Steve Sharp eyes. Yes. And a 5mm yellow LED next to it. Normally when I am working on any dev lash up, I include both a power switch such as this, and a LED. The reason is that it makes it fast to

I have got something very weird going on here, I need to do some more testing of my board. I get the same response for 20m RF scan regardless of the settings of BPF and LPF. There are no L12 taps or

Is that an on/off power switch in the pre-prototype? Steve N9SZ

IC3 changed with cbt3253.? It has the resistance between those pins. I need some guidance on how to set frequencies in the Band setting menu to get proper filter response.? I understand there was an

Hello, Disclaimer: I am not a qualified engineer or professional programmer. I was looking at the schematics of the QDX and was thinking of this idea, of adding a Bluetooth. I think hooking up a

The problem is that those links require an end user to look for them. They don't, they go straight to what wsprnet shows in the top left and corner and then get confused. The website really needs to

Both Minis and the QDX have been sold. Thank you and enjoy. Phil, K3UT

The paddle on the right is 1”. You can look at my QSL page for more information. -- Colin Kaminski - K6JTH https://www.qsl.net/k6jth/

Sorry, scratch that response Robert, I didn't read the, "in Europe" part. Glory to God in the highest, and on earth peace, good will toward men. Luke 2:14

I have had several discussions with users who want to TX at the higher end of the band and with these typical descriptions, they go "above it". They hear 1500 Hz off set and 200 Hz receive band and

Hey Robert, I'd keep an eye on this one.? The last one he had sold for $40 because no one bit on it and the purchaser gave him stellar feedback so I guess he liked it.

Sorry, T2 primary obviously. My mistake. I can see that Hans quite did the job with BPFs, quite...? ?I saw that I still have to adjust L12 for 30m BPF.? But after I change the IC3.? Hot air