Can I use a piece of copper wire for an antenna with this or does it have to be a bar antenna?

Use a 26" to 31" wire. If you are broadcasting at the low end of the dial, use a 31" wire. If broadcasting at the high end of the dial, use a 26" wire. If you are broadcasting in the middle of the dial, use a 28-29" wire. If the wire is in a window, you should get anywhere from 200-400 feet range. If you are on an upper story and use your car radio to receive, it can go "even further".

What are the rx tx and gnd spots used for?

I didn't even realize they were there. They are solder pads. No info was received on their function, but I suspect that they can but used for some sort of circuit monitoring or firmware flashing and probably aren't for everyday broadcast function.

I currently am an extra class amateur radio operator.how do i program these for the 76 mhz band?

Hams aren’t allowed to operate on the 76 MHz band.

Windows doesn't recognize the board as a sound device. i get power from usb, but can only transmit via line in. thoughts?

I attempted to use the USB input with both WIn10 and Win11 laptops. In both cases it worked seamlessly. Two things to try: (1) make sure the USB cable does support data. I tried another USB cable which did not work. I checked with a multi-meter that it only connected the USB power. (2) Check Windows Control Panel and see if there is anything amiss. And make sure the audio 3.5 mm plug is not inserted in the board when you attempt the USB connectivity. When the data link to the PC is successful 'USB' is displayed in the display panel. Hope this helps.

Weewooday 2 Pieces Digital FM Transmitter Module Stereo FM Transmitter DSP PLL 76.0-108.0MHz Stereo Frequency Modulation with LCD Display Line/USB/Mic Input, DC 3.0V - 5.0V

Product ID: 408940978

Details

Special features
LCD Screen
Brand
Weewooday
Connectivity technology
USB
Power source
['DC Powered']
Material
Metal

📻76.0-108.0MHz Range

🔋DC 3.0V - 5.0V Power

🎚️50Hz - 18KHz Response

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9368 som

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Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎉 Tune In to Quality Sound!

🔌 VERSATILE INPUTS - Connect via line, USB, or mic for seamless audio integration.
💡 BRIGHT LCD DISPLAY - Easily view settings in low light with a vibrant blue backlit LCD.
🎶 CRYSTAL CLEAR SOUND - Experience high-quality stereo audio with advanced DSP and PLL technology.
⚡ LOW POWER CONSUMPTION - Enjoy extended use with minimal energy requirements.
🌍 MULTI APPLICATION USE - Perfect for FM broadcasting, monitoring, and more!

The Weewooday Digital FM Transmitter Module is a versatile audio solution that operates within a frequency range of 76.0 to 108.0 MHz. It features a low power consumption design, a user-friendly blue backlit LCD display, and supports multiple audio input channels including line, USB, and mic. Ideal for various applications such as wireless audio broadcasting and monitoring, this module ensures a high-quality listening experience.

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