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.

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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

EC$126

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Sold byAmazon Saint Vincent and the GrenadinesDelivered 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.

Specifications

ASIN	B08PVBZB8F
Additional Features	LCD Screen
AntennaDescription	75 cm bar antenna
Audio Input	LINE/USB/Mic
Audio Output Mode	Stereo
Audio Output Type	internal
Best Sellers Rank	#84 in MP3 Player FM Transmitters
Brand	Weewooday
Compatibility Options	FM Radio Capable Devices, USB
Compatible Devices	FM Radio Capable Devices
Connectivity Technology	USB
Connector Type Used on Cable	USB Type A
Control Method	Touch
Customer Reviews	4.4 out of 5 stars 167 Reviews
Display Type	LCD
Hardware Interface	USB
Human Interface Input	Buttons
Installation Type	wired
Item Weight	18.14 g
Lithium-Battery Voltage	5 volts_of_direct_current
Manufacturer	Weewooday
Model Name	Transmitter Module-01
Number of Channels	1
Power Source	Corded Electric
Special Feature	LCD Screen
Supported Application	FM wireless, USB PC broadcast, maternal and child monitoring, wireless microphone
Supported Media Type	USB
Supported Standards	802.11b, 802.11g, 802.11n
Unit Count	2 Count
Wireless Communication Standard	802.11bgn
Wireless Compability	802.11bgn

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