Hey Guys, I am not a programmer but got it to work in the end. It really makes the QDX come alive. I hated not being able to hear what was going on with this radio. Now, you clever guys…how do I VNC t

doh, found i had missed the actual bit that says... 'You can find the program files for firmware revision 1.03 here ( https://www.rosenatthewheel.com/qdxsdr103.zip ) (the revision 1.04 version is in p

Hi Johan, 73 Ken g4apb

The QDX manual states; If you wish to use a supply of 12 - 13 V the 3:2 winding style is more suitable and will produce 4 – 5 W output for 12 – 13 V supply. I started with the 9v build and it gave me

Alan, you said; After configuring all bands to use the 10m LPF ….. How did you get a 10m lpf on the qdx please? I looked at Hans lpf schematic and downloaded the ‘Elsie’ lpf calculator programme, but

#qdx

Thanks for that Hans, no need to change the bootloader! However, so I dont 'brick' my QDX by trying this for myself, can the EEPROM file name be given a version number or name change by ME? Reason is,

Thanks Hans, the trick is to actually DO a firmware update. I just tried it with v1-005-002 on my Raspi and it did reboot. What I did was before just look at the firmware update using terminal emulato

Hi Hans, if you are looking to release a further firmware update for the QDX, I have a feature request for consideration. I usually remotely VNC into the PC running my QDX. This is great until to go i

The rf output is connected to one pole of the switch, the centre pin connects to the RF test pin on the 4 way connector. The 12V pin on the 4 way connects to the other pole of the switch. You are corr

I added a switch on my mini to switch between RF and DVM. If you only want to use an spco switch, connecting the DVM to the rf pin just gives a diode drop less reading on battery symbol. As the indica

Many thanks for the explanation Hans, That is very useful information when it comes to experimenting with other bands. I am currently using my QDX v3 a firmware 1.04, on 40mhz (8m) band to monitor my

What determines the bpf/lpf switch over frequency in the band configurations? Does the firmware compare the frequency you have set via CAT with the band limits set in the configs and set to the lpf in

Hi Dave, do you have the ‘flatten’ box ticked in wsjt-x? This can give you the effect you see. Try unticking it. Ken g4apb

#qdx

You clever boy Pim... Confirmed hard track short circuit exactly where you said, took quite some effort with a scalpel to remove it under my eyeglass. Not a solder bridge short, this was actual copper

#qdx

I went round every major component and squirted it with freezer spray. The only area that it went haywire was the tcxo. Current in receive mode shot up initially to 200mA, then my psu current limit cu

#qdx

Thanks for that Dave and Pim, it confirms to me there is more than build issues here. I see the same interference on well proven analogue psu or battery, regardless of PC used or USB lead etc etc. My

#qdx

Dave, you seem to be getting Exactly the same results as me. rx current 180mA, low audio out (btw, mic input is wrong input for wsjt-x - select qdx ip and op), poor LSB separation. When you have selec

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Hi Alan, many thanks for that but how did you do the above? There are only 6 band config positions but there are 10 bands covering 80-10m? Do you see any of this strong interference at 500Hz steps. I

#qdx

Alan, HOW is your QDX working ‘on all bands 80m to 10m?’ If I select any frequency from 17m to 10m, all I see are strong tramlines at 62.5hz and stronger ones at 500hz across the audio band if I use w

#qdx

Evan, voltage checks 12v supply; 50ohm dummy load to antenna port.Results using WhiteGold digital multimeter; IC2 5.00v out. Rx input current no USB lead, 170mA. USB lead connected to Raspi, running w

#qdx