10-Meter QRP 29.4912 MHz Crystal Controlled Oscillator

Description

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10-Meter QRP Crystal Oscillator
29.4912 MHz QRP Transmitter
Manufactured by RALTRON
Fully shielded circuit
Datasheet for CO6100-29.4912:
https://linearparts.com/documents/Raltron_CO6100_datasheet.pdf
Price is for (1) pc
(Check our store for larger, discounted quantities.)
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 Ω load. The 29.4912 MHz (±100 ppm) nominal frequency is in the sparsley occupied upper end of 10-Meter band and should be free from interference.
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 for Raltron CO6100-29.4912:
https://linearparts.com/documents/Raltron_CO6100_datasheet.pdf
Application Ideas
Shown in the pictures above are a few simple schematics for your experiments.
Note: This listing is for the oscillators
only
. The other parts shown in the schematics 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 approximately 35~40 milliwatts into a resistive 50 Ω load with 5 volts applied. At 5 volts, current at pin 14 measured 4.3 mA unloaded and 15 mA with a capacitively coupled 50 Ω load.
Boosting the Power up to 300 mW (but it has it's risks)
Experimenters, you may want to try boosting the power by raising the input voltage. It can be done, but proceed at your own risk.We tried it and here is what I found.
I tested one of these oscillators at 9* volts for several hours. The frequency shifted downward ~250 Hz from the 5 volt level but the RF output voltage doubled. That quadrupled the power to about 150 mW. It remained stable throughout the test. The can did not get warm during the test.
*IMPORTANT: Nine volts greatly exceeds the spec's 5.5 volt max so there is NO guarantee any given unit will work at all at 9 volts or for how long. At 9 volts input, current measured 10 mA unloaded and 34 mA with a 50 Ω load. Permanent damage may occur at this voltage/current level and is only discussed here for experimental purposes. Your results may vary.
Taking it to the next level I tried applying 12 volts. The output voltage went up to about 2.8 times the level seen with 5 volts applied, producing almost 8 times the output power. I estimate an output of about 300 mW in to the 50 Ω load, but I do not have the equipment to measure it precisely. With twelve volts applied the unloaded current was 21 mA while loaded, the current rose to 53 mA for an input power of a little over 600 mW. Again, after allowing a moment to stabilize, there was little change during a 90 minute test. The can warmed a barely noticeable amount.
Bear in mind that these tests were conducted in a continuous on state and intermittent duty such as in CW mode should be less stressful. Nevertheless, operation at voltages exceeding the specifications may shorten the lifespan of the part. The curious experimenter may find the risk acceptable.
QR-1
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