(1) 28.224 MHz Beacon QRP Crystal Oscillator

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Most purchases qualify for a ** Combined Shipping Discount **Fast eMailFast ShippingGuaranteed 28.224 MHz QRP Oscillator

10-Meter QRP Beacon Transmitter
Manufactured by CARDINAL
P/N CTH11001-28.224
Fully shielded circuit

Price is for (1) pc

(Check our store for other quantities and discounts.)

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 28.224 MHz (±100 ppm) nominal frequency is near the center of the 10-Meter beacon 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.] The four-pin footprint matches the corner pins of a standard DIP14 package. Pin 1 (squared corner) is not used. Pin 7, ground, is internally connected to the metal can.

Datasheet:

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.

The output (pin 8) 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 14 measured 17 mA unloaded and 26 mA with a 50 ohm load.

We tested one of these oscillators at 9 Volts for 4 hours. The frequency shifted <100 Hz from the 5 volt state while the RF output voltage doubled (approximately quadrupling the power) and remained stable throughout the test. The can was warm, but not hot to the touch. Nine volts greatly exceeds the spec\'s 5.5 volt max so there is NO guarantee any will work at all at 9 volts or for how long. At 9 volts input, current measured 50 mA unloaded and 73 mA with a 50 ohm load.

We also tested it at 12 volts. At 12 volts, it only worked for a few seconds and then stopped. The current skyrocketed and permanent damage will occur if left at 12 volts (or perhaps less) too long. We immediately removed power and it appeared to recover with 9 volts applied.

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Condition of Goods
Unless otherwise noted above:
NOS (New Old Stock) or better, clean, unused
30 day Non-DOA, Good-on-Arrival Guarantee
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PCB parts are thru-hole, NO SMD/SMT
Small parts may be bulk packed
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We DO NOT ship Internationally.
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IMPORTANT: The parts we sell are categorized as new because they are unused, but many of our parts are those rare, hard-to-find, discontinued, manufacturing surplus and / or old stock commonly known in the parts business as \'NOS\' (New Old Stock). Some of our stock pictures show date codes which may vary from the actual product shipped.Parts from a larger OEM package may be repacked for smaller lot size orders or for more practical handling and shipping. See our store for other listed quantities.We strive to give full and accurate descriptions to earn your 5-Star response. Any known deficiencies are listed in the detailed description. Datasheets are provided when available. Some datasheets may be close but not a perfect match because of part revisions or because they may be from a different manufacturer. If you have any questions concerning our products please email us before purchasing. Your complete satisfaction is important to us before and after the sale. Thank you.

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