TINY 6 Meter QRP Transmitters [or Wireless Alarm Sending Units]
0208
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1/30
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units per lot.
Seiko Epson SG-615PH Datasheet:
https://linearparts.com/documents/sg-615ph.pdf
SG-615PH Catalog Sheet:
https://linearparts.com/documents/sg-615ph-cat.pdf
See Simplicity, Range and Alarms below. Operate
CW, MCW or even AM
mode!
Amateur Radio HAMs, get your 6-Meter QRP NET on the air FAST
and SIMPLE with these self-contained low-power transmitters.
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).
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).
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.
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:
https://linearparts.com/images/6M-QRP-SCH-T.gif
] example for Modulated CW. Select different values of
resistors and capacitors (at pin 6 of the NE555) for different tones.
SIMPLICITY – Standard or OE Keying
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.
AMPLITUDE MODULATION
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.
Alternate OE keying [Example schematic:
https://linearparts.com/images/6M-QRP-OE-alt-sch.gif
] 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.
RANGE
Of course range varies widely and avid QRP’ers know that it’s the
Antenna, Antenna, Antenna
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.)
WIRELESS ALARMS – Anywhere
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.
Other possibilities: Fox Hunt, Beacon, Model Rocket or Balloon Payload Telemetry.
160, 80, 40, 20, 10 and other 6 Meter versions available.
Check our other listings or e-Mail us.
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.
Q6-6
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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
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