Pira.cz Technical Forum

FM Analysis => P275 FM Analyzer => Topic started by: mimu on August 08, 2024, 04:09:25 pm

Title: Relay for antenna switching
Post by: mimu on August 08, 2024, 04:09:25 pm

Hello, does anyone have suggestions for a suitable relay to switch the antenna input of the P275 using GPIO outputs? Thanks.

Title: Re: Relay for antenna switching
Post by: Jan on August 08, 2024, 05:54:40 pm

I'm using this board https://pira.cz/show.asp?clanek=prepinac_anten_HMC253 from eBay
in this project https://pira.cz/monitor/

You can directly connect the alarm/gpio outputs to the board's pins A, B, C to switch up to 8 antennas  8)

Soon I will publish the new script files for the monitoring.

Title: Re: Relay for antenna switching
Post by: mimu on August 09, 2024, 04:35:27 pm

Wow, great  :D
Can it also be powered via the alarm out? Is the power sufficient?

Title: Re: Relay for antenna switching
Post by: Jan on August 09, 2024, 04:58:55 pm

Yes, exactly. I'm using it that way.

Title: Re: Relay for antenna switching
Post by: mimu on February 10, 2025, 12:04:43 am

Hi Jan, are there any plans to integrate the HMC253 directly into your analyzers?