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20 15 and 10 meters doesn t work

 

Hi group, I bought a used x1m pro two days ago. It works great on 80 and 40 meters bands ( full 5 watt output and good reports), but on 20 , 15 and 10 meters bands it uses just 0.2A and virtually no output (seen on my wattmeter). I noticed that when I transmit (with a dummy load) outside the ham bands I get full output power also near the ham bands ( E.G 14.400 mhz), so I think that the problem is somewhere in the band pass filters. I desoldered the two relay switches of the 20 meters band filter and they worked fine, also tested all the other relays and toroids and everything seems ok.? Any ideas? Has anyone had the same problem?

Thank you :)

 

Marco,

I would start by flashing a new F/W to the radio. This should stop the out of band transmission which is an option in the settings menu.?
You can change this setting without flashing but best start with a clean slate.
Download the rather sparing circuit diagram from the group pages.
I seem to remember 15 and 20 shared the same filter and 10 had its own. I may be wrong though, it has been some time since I worked on one.
The circuit diagram is easy enough to follow and has its own dedicated page for the low pass filter section.

Don't forget the jumper board at the rear of the radio is polarised but can still be fitted both ways. The result will be a burned regulator.

I would suggest maybe a switching diode has gone open.

Nigel ZL1NAY

Kia Kaha


On Sun, Mar 20, 2022, 6:52 AM Marco IU8OJT <iu8ojt@...> wrote:
Hi group, I bought a used x1m pro two days ago. It works great on 80 and 40 meters bands ( full 5 watt output and good reports), but on 20 , 15 and 10 meters bands it uses just 0.2A and virtually no output (seen on my wattmeter). I noticed that when I transmit (with a dummy load) outside the ham bands I get full output power also near the ham bands ( E.G 14.400 mhz), so I think that the problem is somewhere in the band pass filters. I desoldered the two relay switches of the 20 meters band filter and they worked fine, also tested all the other relays and toroids and everything seems ok.? Any ideas? Has anyone had the same problem?

Thank you :)

 

Nigel,

Thank you very much for your suggestions. I have flashed a new firmware and I'm trying to debug the?problem . I have also noticed that in mode usb/lsb the radio doesn't have any output on any frequencies, and the display backlight works just when something on the display is changing. I will try to test every diode, hope to get back with some good news . Thank you!

Marco IU8OJT.


On Sun, Mar 20, 2022 at 3:59 AM Nigel Young ZL1NAY <multilec@...> wrote:
Marco,

I would start by flashing a new F/W to the radio. This should stop the out of band transmission which is an option in the settings menu.?
You can change this setting without flashing but best start with a clean slate.
Download the rather sparing circuit diagram from the group pages.
I seem to remember 15 and 20 shared the same filter and 10 had its own. I may be wrong though, it has been some time since I worked on one.
The circuit diagram is easy enough to follow and has its own dedicated page for the low pass filter section.

Don't forget the jumper board at the rear of the radio is polarised but can still be fitted both ways. The result will be a burned regulator.

I would suggest maybe a switching diode has gone open.

Nigel ZL1NAY

Kia Kaha

On Sun, Mar 20, 2022, 6:52 AM Marco IU8OJT <iu8ojt@...> wrote:
Hi group, I bought a used x1m pro two days ago. It works great on 80 and 40 meters bands ( full 5 watt output and good reports), but on 20 , 15 and 10 meters bands it uses just 0.2A and virtually no output (seen on my wattmeter). I noticed that when I transmit (with a dummy load) outside the ham bands I get full output power also near the ham bands ( E.G 14.400 mhz), so I think that the problem is somewhere in the band pass filters. I desoldered the two relay switches of the 20 meters band filter and they worked fine, also tested all the other relays and toroids and everything seems ok.? Any ideas? Has anyone had the same problem?

Thank you :)

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