(6) Tracking / CW / Beacon TRANSMITTERS - 6-Meter / 50.35 MHz - Wt Just 1/30 Oz

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TINY 6 Meter QRP Transmitters [or Wireless Alarm Sending Units]<br>0208<br>Most purchases qualify for a **<br>Combined Shipping Discount<br>**<br>Fast eMail<br>Fast Shipping<br>Guaranteed Good-on-Arrival<br>Qty (6)<br>TINY<br>1/30<br>th<br>oz.<br>units per lot.<br>Seiko Epson SG-615PH Datasheet:<br>https://linearparts.com/documents/sg-615ph.pdf<br>SG-615PH Catalog Sheet:<br>https://linearparts.com/documents/sg-615ph-cat.pdf<br>See Simplicity, Range and Alarms below. Operate<br>CW, MCW or even AM<br>mode!<br>Amateur Radio HAMs, get your 6-Meter QRP NET on the air FAST<br>and SIMPLE with these self-contained low-power transmitters.<br>Small enough to hide under a penny. Light enough to fly by helium balloon or model rocket. They weigh only 0.03 oz (0.9 gm).<br>These are clock oscillators in a SMD package. The nominal 50.35 MHz frequency is located in the active, lower end of the 6-Meter HAM band (50.0 to 54.0 MHz).<br>Guaranteed fun for any radio experimenter. Add realism to code practice sessions by actually going on the air while you teach real life NET operating skills to your HAM class! All HAM license classes except Novice are authorized to operate on this frequency. Try your skill at working DX on QRP.<br>If your receiver has a product detector or BFO, use these in CW (Carrier) Mode. You can identify different transmitters by the slight variations in frequency. If you are using an AM-only receiver, you can add a simple modulator, such as MCW Mode [Example schematic:<br>https://linearparts.com/images/6M-QRP-SCH-T.gif<br>] example for Modulated CW. Select different values of resistors and capacitors (at pin 6 of the NE555) for different tones.<br>SIMPLICITY - Standard or OE Keying<br>Simple to wire. 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. For Standard CW: Ground pin 2, connect a LPF and antenna to pin 3 and key +5 VDC to pin 4 (see below) and you're on the air. (Keep leads short or add a 0.001µF bypass across pins 2 & 4 to improve oscillator stability.) Can't get any simpler! But for a few more bells and whistles, read on.<br>AMPLITUDE MODULATION<br>AM operation is possible by adding a small audio transformer. (Transformers are available in our other auctions.) The example above works well with an audio source that is designed to drive a speaker. Note the reversal of PRI and SEC windings. We used a 200:8 Ω transformer, but the impedances are not critical and almost anything close will work.<br>Alternate OE keying [Example schematic:<br>https://linearparts.com/images/6M-QRP-OE-alt-sch.gif<br>] uses the Output Enable pin 1. When pin 1 is held low through a 1 K resistor, the output at pin 3 is turned off, but the oscillator keeps running. Key +5 volts to pin 1 in this configuration for computer generated Morse code.<br>RANGE<br>Of course range varies widely and avid QRP'ers know that it's the<br>Antenna, Antenna, Antenna<br>that is the key. I took one out in the car for a field test, grounded to the console, and with only a 4½' wire draped over the passenger seat for an antenna. With only a roof level vertical, my IC-746 was still picking up a good signal over 1½ miles away until the terrain blocked the signal. Imagine what you can do with two beams. No predictions here, but when the band is open, 6M propagation is amazing. (The output is CMOS so consider using a Low Pass Filter to suppress harmonics. FM 100.7 is the second harmonic.)<br>WIRELESS ALARMS - Anywhere<br>Wire a door, gate, pool level detector, thermostat, sound actuated relay -- 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 even needed. A stable receiver or scanner can cover the perimeter of your yard. Carrier Mode is the simplest method. If you prefer a tone, a simple LM555 based oscillator, such as the one shown in the "MCW Mode" link above, will modulate the transmitter. Different timing resistors and capacitors will produce different tones to identify transmitters.<br>Other possibilities: Fox Hunt, Beacon, Model Rocket or Balloon Payload Telemetry.<br>160, 80, 40, 20, 10 and other 6 Meter versions available.<br>