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TOPIC: Sunsdr2 PRO - No output power on HF

Sunsdr2 PRO - No output power on HF 20 Jan 2022 21:25 #1

  • F8ATM
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Hi,
My SunSDR2 PRO, do'nt give any more output power on all HF bands.
it turns to TX, i can see the TX signal on the spectrum (tune or cw) but 0 Watt output ...
the TX power settings are 20W on all HF bands. Drive and Tune cursors are at maximum level.
I noticed the issue is only on HF bands and not on 2 meters band (10W output OK on 144Mhz).
i inverted the antenna output A1 and A2 (HF-VHF) but the issue remains on HF
I noticed 0W output but The electrical consuption goes from 1.1A (RX) to 1.4A (TX)
Is it related to the Power transistors or to something else?
Is the the transitors are easy to find and to replace?
Is someone already met that case?
73
Laurent F8ATM
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Sunsdr2 PRO - No output power on HF 20 Jan 2022 21:51 #2

  • gi4fue
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Bonsoir Laurent

I think your problem may be a failure of Relay K1_PA. A few of us have had this issue. The relay is easy to obtain but somewhat tricky to fit (its a small SMD relay)
Hope this helps

73, Charlie GI4FUE
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Sunsdr2 PRO - No output power on HF 21 Jan 2022 06:38 #3

  • Rome
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Hi, all.
Here is the instruction to check the HF TX path.
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Роман, Roman
Expert Electronics
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Sunsdr2 PRO - No output power on HF 21 Jan 2022 11:48 #4

  • F8ATM
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Hello Roman,
Just to be sure, i have to turn ON the transceiver and measure the voltage between the marked points on your picture and the ground?
Please confirm and Iwill do the described test.
Regards
Laurent F8ATM
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Sunsdr2 PRO - No output power on HF 21 Jan 2022 20:26 #5

  • EI9HEB
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How else do you want to get the measurements?
How do you VooDoo?
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Sunsdr2 PRO - No output power on HF 23 Jan 2022 14:11 #6

  • SM2UHF
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If you going to change the relay by your self, first ESD safe tools, and you need to preheat the PCB and heat shield around the the relay before you desolder it with hot air.

Just a tip
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Sunsdr2 PRO - No output power on HF 23 Jan 2022 23:31 #7

  • F8ATM
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Hi Lars,
Thank you for advice.
I am not 100% sure the issue is related to this relay or to the RF power chain.
I think I don’t have knowledge and tools to replace this small relay safely….
I am looking for someone able to repair it.
I read you own a company which repair trx, May be I can send it to you for service?
73
Laurent
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Sunsdr2 PRO - No output power on HF 24 Jan 2022 13:18 #8

  • SM2UHF
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Hi

Absolutely you can do this, we have all the soldering equipment and instruments.

My best reg 73
Lars
SM2UHF
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Sunsdr2 PRO - No output power on HF 26 Jan 2022 15:51 #9

  • F8ATM
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Hello Lars,
I will send my TRX to youfor repair, I sent you an email
73
Laurent F8ATM
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Sunsdr2 PRO - No output power on HF 01 Feb 2022 15:18 #10

  • SM2UHF
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Hi Laurent

I received you SUNSDR2 PRO today and I have repair it, now it is working.

My best reg
Lars H Flygare
SM2UHF
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Sunsdr2 PRO - No output power on HF 15 Feb 2022 12:01 #11

  • G3RCE
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I have the same problem
No output on any hf band
I thought it may be a software setting
Have tred a reset, still zero output?
Sunsdr2pro purchased from Martin Lynch 3 months ago
73 Rob G3RCE
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Sunsdr2 PRO - No output power on HF 15 Feb 2022 12:07 #12

  • G3RCE
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Hello Roman
My Sunsdr2pro was purchased from Martin Lynch 3 months ago.
Suddenly no output power on any HF band for no apparent reason.
73
Rob
G3RCE
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Sunsdr2 PRO - No output power on HF 15 Feb 2022 12:13 #13

  • Rome
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Hello Rob.
Check the HF TX path according to the instruction - eesdr.com/en/forum-en/hardware-ss2/9604-sunsdr2-pro-no-output-power-on-hf#20966
Роман, Roman
Expert Electronics
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Sunsdr2 PRO - No output power on HF 15 Feb 2022 22:25 #14

  • G3RCE
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Thank you Roman
As it is under warranty I will return it to Martin Lynch for examination and repair
Best Wishes
Robert
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Sunsdr2 PRO - No output power on HF 07 Apr 2022 13:03 #15

  • G3RCE
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Hi Rome
I had a problem , no power out on HF only, a while back.
I have now received Sunsdr2pro back from Martin Lynch
fully working. Great!
It was a faulty relay
Looking forward to the final version of SDR3
73 and take care all at Expert electronics
Rob G3RCE
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