The signal is very poor when I use headphone for ANT

[sunnyguhz]

Hi,
I make a radio used your library with RDA5807 + STM32G030F6P6 + 128*64 LCD, it wroks. I'm very happy with it. But, I found the signal on the radio to be very poor when I use headphone for ANT. The signal is very good when I use other ANT.

Do you test with headphone for ANT? Is there any way to better with headphone for ANT?

Sorry, I'm a chinese and my English is very poor.

[pu2clr]

Hello. Thanks for your email and feedback. I have never used my prototypes with headphone. My main focus is the firmware. Please, check some functions available in my library that deal with audio. Specially, the setup the impedance of the audio output. For example setAudioOutputHighImpedance( true )

On Tue, 8 Aug 2023 at 13:08 sunnyguhz ***@***.***> wrote: Hi, I make a radio used your library with RDA5807 + STM32G030F6P6 + 128*64 LCD, it wroks. I'm very happy with it. But, I found the signal on the radio to be very poor when I use headphone for ANT. The signal is very good when I use other ANT. Do you test with headphone for ANT? Is there any way to better with headphone for ANT? Sorry, I'm a chinese and my English is very poor. — Reply to this email directly, view it on GitHub <#14>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAVSJNA6XXQ4ZMXMMURRPRDXUJP6TANCNFSM6AAAAAA3IWSBBE> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

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[sunnyguhz]

Think you for your answer. I made a signal amplification and interference filtering circuit myself，my radio with RDA5807 can receive abput 60 channels indoors now. It‘s very good.

[ldicdican]

Think you for your answer. I made a signal amplification and interference filtering circuit myself，my radio with RDA5807 can receive abput 60 channels indoors now. It‘s very good.

Hi, care to share the schematic of the signal amplification and interferences filtering circuit?

Thanks in advance

[sunnyguhz]

Think you for your answer. I made a signal amplification and interference filtering circuit myself，my radio with RDA5807 can receive abput 60 channels indoors now. It‘s very good.

Hi, care to share the schematic of the signal amplification and interferences filtering circuit?

Thanks in advance

It's testing now, I will share it when testing end.

[snakeye]

Hi @sunnyguhz,

did you find any solution? I'm building the radio and trying to decouple signals following the article https://www.digikey.no/no/blog/getting-headphone-leads-to-do-double-duty. The same problem as you described - it works fine with a separate antenna and a lot of noise without it.

[sunnyguhz]

Hi @sunnyguhz,

did you find any solution? I'm building the radio and trying to decouple signals following the article https://www.digikey.no/no/blog/getting-headphone-leads-to-do-double-duty. The same problem as you described - it works fine with a separate antenna and a lot of noise without it.

I added a first level signal amplifier before the FM signal input of RDA5807, and now it can receive dozens of radio stations indoors when using headphones as antennas.
This is a video of my RDA5807 radio.
https://www.bilibili.com/video/BV1bXmZYzEu2/?vd_source=c57978b7c96179b0ac17acfde8415813