Check the listing for details. (5) 28.570 MHz Miniature "Half-Can" 5 VDC 10M QRP Oscillators ** USA SELLER **. Condition: New. Listed at 9.95 USD. 28.570 MHz Beacon QRP Crystal Oscillator 0223 Most purchases qualify for a ** Combined Shipping Discount ** Fast eMail Fast Shipping Guaranteed Good-on-Arrival (5) 28.570 MHz QRP Transmitters 10-Meter QRP CRYSTAL CONTROLLED OSCILLATORS Manufactured by CARDINAL CTHll004-28.570 Fully shielded circuit in a "half-size" metal can. Datasheet: https://linearparts.com/documents/QH-datasheet.pdf Price is for (5) pcs (Check our store for larger, discounted quantities or email us.) Build your own 10-Meter Beacon with this QRP transmitter. With 5 Volts applied, the output power is approximately 35~40 mW into a capacitively coupled 50 ohm load. The 28.570 MHz (±100 ppm) nominal frequency is near the lower end of the 10-Meter phone sub-band. The output is a TTL compatible square wave and a LPF (low pass filter) is recommended to remove harmonic content. [LPF(s) are NOT included, but are sold separately.] The four-pin footprint matches the corner pins of a standard DIP8 package. Pin 1 (squared corner) is not used. Pin 4, ground, is internally connected to the metal can. Application Ideas Here are a few simple schematics for your experiments. Note: This listing is for the oscillators only. The other parts shown are NOT included. Check our store for the NE555 ICs and the 0.33 µH coils or LPF parts kits. The output (pin 5) is a TTL compatible square wave producing approx. 35~40 milliwatts into a 50 ohm load with 5 volts applied. At 5 volts, current at pin 8 measured 17 mA unloaded and 26 mA with a 50 ohm load. We tested one this series of oscillators at 9 Volts for 4 hours. The frequency shifted