No output on VHF

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G7OGG
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Joined: Sat Sep 30, 2023 2:00 pm

No output on VHF

Post by G7OGG » Thu Oct 05, 2023 11:22 am

Hello, I just undated my RT90 V2.1 to the latest version but have power output on 2M 145 MHz analogue. If I turn the power on the 40 watt I do get 0.4 watts out of it. It's like the PA for VHF has blown but it was ok before. Any ideas please?

Thanks Lee.

G4EML
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Joined: Sat Nov 16, 2019 10:01 am

Re: No output on VHF

Post by G4EML » Thu Oct 05, 2023 11:30 am

The RT90/MD9600 only has one PA, so if it is working on UHF then it is not damaged.

Are you sure that you loaded the correct firmware version for your radio? Mismatched versions will not transmit.

Colin G4EML.

G7OGG
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Joined: Sat Sep 30, 2023 2:00 pm

Re: No output on VHF

Post by G7OGG » Thu Oct 05, 2023 11:42 am

Thank for the replay, on the board is marked MD9600-UV-V2.1-170608 so I used firmware ver2. 70CM UHF works fine. Tried version 3 but this made it transmit of frequency.

Lee.

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LU2BAM
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Location: Buenos Aires - Argentina

Re: No output on VHF

Post by LU2BAM » Thu Oct 05, 2023 1:48 pm

Buen día, quizá sirva contar mi experiencia. Me sucedió lo mismo, salida normal en UHF y no salida en VHF. Concurrí a los servicios de LU2DR quien pudo determinar que un diodo PIN de la plaqueta madre estaba fuera de servicio, se reemplazó dicho componente y el TYT 9600 volvió a funcionar normalmente.

G7OGG
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Joined: Sat Sep 30, 2023 2:00 pm

Re: No output on VHF

Post by G7OGG » Thu Oct 05, 2023 4:41 pm

LU2BAM wrote:
Thu Oct 05, 2023 1:48 pm
Buen día, quizá sirva contar mi experiencia. Me sucedió lo mismo, salida normal en UHF y no salida en VHF. Concurrí a los servicios de LU2DR quien pudo determinar que un diodo PIN de la plaqueta madre estaba fuera de servicio, se reemplazó dicho componente y el TYT 9600 volvió a funcionar normalmente.
Don't suppose you know where these diodes are?

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LU2BAM
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Location: Buenos Aires - Argentina

Re: No output on VHF

Post by LU2BAM » Thu Oct 05, 2023 9:16 pm

Buenas tardes Lee, te envié fotografías a tu correo electrónico del diodo PIN en cuestión.

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LU2BAM
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Joined: Mon Aug 29, 2022 12:12 pm
Location: Buenos Aires - Argentina

Re: No output on VHF

Post by LU2BAM » Thu Oct 05, 2023 9:20 pm

Image

diodo PIN dañado

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