(10) 10M Novice / Tech QRP Transmitter [only 1/30th oz] - eBay (item 370276297333 end time Nov-09-09 21:56:06 PST)


Bidding has ended on this item. Item:(10) 10M Novice / Tech QRP Transmitter [only 1/30th oz]

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Technician Class 10 Meter QRP Transmitter - 28.321 MHz

1001

HAM Radio

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Very lightweight, only 1/30^th oz.

Qty (10) Miniature units go to the Winner

Full Datasheet: Epson SG-615 (71K PDF) Catalog Datasheet: Epson SG-615 Cat. (140K PDF)

Check: Range Simplicity Alarms. Operate CW, MCW or even AM mode!

Amateur Radio HAMs, get a 10 Meter QRP NET on the air FAST and SIMPLE with these self contained low-power transmitters. High bid wins the lot of (10) units.
These are clock oscillators in a SMD style package. The nominal 28.3210 MHz frequency falls nicely in the 10 Meter Novice / Technician HAM band segment (28.000 to 28.500 MHz) and can be used by all HAMs with HF privileges.

Classroom MORSE CODE Training
Guaranteed fun for all. Use as a training aid to add realism to code practice sessions by actually going on the air to learn real life NET operating skills! Place a single radio in the classroom, and let a handful of kids "call" and communicate with each other using only their CW skills. No talking allowed. Standby for break-ins.

SIMPLICITY - Standard or OE Keying
Simple to wire. Ground pin 2, key +5V to pin 4 and connect your antenna to pin 3 (shown below). Can't get any simpler!

These are SMD devices. The "J" leads can be straighted or bent outward for wiring. They are short and won't protrude through a standard PCB, but it's easy to improvise. Add a 0.001µF bypass to pins 2 & 4 to improve oscillator stability. For a few more bells and whistles, read on.

Alternate OE keying uses the Output Enable pin 1, shown in the left drawing below. When pin 1 is held low through a 1 K resistor, the output at pin 3 is turned off, but the oscillator is kept running. Keying +5 volts to pin 1 in this configuration is the way to go if you use computer generated morse code. Return to top.

If your receiver has a product detector or BFO, use these in CW (Carrier) Mode. You can identify different stations by the slight variations in frequency. If you are using an AM-only receiver, you can add a small transformer for AM modulation or a tone generator for MCW operation as shown in the schematic examples below. Choose different values of resistors and capacitors for different tones.

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LONG RANGE
Of course range varies widely and experienced QRP'ers know that it's the Antenna, Antenna, Antenna that is the key. An example: I tested similar 6M and 10M units on the road using only a short wire antenna draped over the car seat. Both carried over 1½ miles to a receiver connected to a roof level vertical. I imagine these will perform similarly. But the real possibilities come from elevated antennas on both ends, especially beams.
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AMPLITUDE MODULATION
AM operation is accomplished by adding a small audio transformer. (Transformers are not included in this auction, but are available in our other auctions.)
The design to the right works well with an audio source intended to drive a speaker. Note the reversal of PRI and SEC windings. The impedances are not critical and almost anything close will work. Return to top.

Easy WIRELESS ALARMS Anywhere
Wire a pressure switch, door, gate, pool level detector, thermostat -- anything that can switch 5 Volts. Use 4 AAA's and a diode to drop the voltage to about 5.5V. For short distances, an antenna is not needed. A stable receiver or scanner will cover the perimeter of your yard.
Carrier (CW) Mode is the simplest method, but a NE555 oscillator, such as the one shown in the MCW Mode (Modulated CW) schematic above, will modulate the transmitter if you prefer a tone. Different resistors / capacitors will produce different tones to distinguish different monitoring / alarm stations.

Substitute a thermistor for the timing resistor (3.3K at pin 6) to make a simple temperature telemetry transmitter.
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Other possibilities:

10M Fox Hunt
Beacon
Telemetry
Model Rocketry (Only 0.9 gm, or 1/30^th oz.) or helium balloons.
Add a divide by 2 IC* circuit for a 20 Meter HAM band output.
Add a divide by 4 IC* circuit for a 40 Meter HAM band output.
Add a divide by 8 IC* circuit for a 80 Meter HAM band output.
Add a LPF and a small amp on your band of choice for a serious QRP transmitter.
* Note: a 74LS74 or equivalent binary divider is recommended.

160, 80, 20, 6 (SMD) and other 10 Meter thru-hole PCB versions are available.
Check our other auctions or e-Mail us.

Buy It Now - BONUS Low Pass Filter Kits

If you are the 1^st bidder and if you choose eBay's option for this item, you will also receive, for FREE, two complete sets of parts to build two easy-to-build Five-Pole Chebyshev 33 MHz Low Pass Filters . This LPF design is right out of the 'Handbook'. No tuning required.
You get (4) 100pF and (2) 180pF Silver Mica capacitors plus (4) 0.33µH coils (coils - always a nuisance to buy or wind) securely wound on polypropylene forms, with tinned leads, ready for PCB mounting. The coils are a real value! Compare at over $1 each. This BIN bonus is easily worth $4 alone!

Don't wait! The BIN option is only available to the 1^st bidder.
To receive this bonus, you must Buy It NOW!

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Note: Configurations and applications vary and performance varies. Please review FCC Part 15 and Part 97 if you are not certain your particular use is in compliance. The suggestions above are not intended to promote illegal or improper use. It is the amateur's responsibility to ensure the completed transmitter is in compliance and that it's operation does not interfere with other equipment.

QS-10
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NOS or better, clean, unused
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These parts are SMD
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