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Item:(8) QRP Transmitters 6M HAM Band 50.35 MHz wt.= 0.03 oz

(8) QRP Transmitters 6M HAM Band 50.35 MHz wt.= 0.03 oz

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Ended:Nov 16, 200909:21:13 PST
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10 lots available (8 items per lot)
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Price:US $12.50
Shipping:$3.20US Postal Service First Class MailSee more services 

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Item number:370276456990
Item location:South Central, United States
Ships to:United States
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Item specifics
Brand: Seiko / EpsonModel: SG-615
TINY 6 Meter QRP Transmitters [or Wireless Alarm Sending Units]

1017

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Qty (8) TINY 1/30th oz. units per lot.

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

Click: Range Simplicity Alarms. 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. Sold in lots of (8) units per lot.

Small enough to hide under a penny. They weigh only 0.03 oz (0.9 gm). Light enough to fly by helium balloon or model rocket.

These are clock oscillators in a SMD package. The nominal 50.35 MHz frequency is located at 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 this MCW Mode Circuit example for Modulated CW. Select different values of resistors and capacitors (at pin 6 of the NE555) for different tones.

Try Amplitude Modulation (AM). Use a standard 200:8 Ohm transistor audio output transformer as a modulation transformer. See the diagram below.

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. Return to top.

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. The impedances are not critical and almost anything close will work. Return to top.

Alternate OE keying 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. Return to top.

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 will do with two elevated 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.) Return to top.

Click link for Alternate OE keying or for a MCW Mode Circuit.

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 this link: MCW Mode Circuit, will modulate the transmitter. Different timing resistors and capacitors will produce different tones to identify transmitters. Return to top.

Other possibilities: Fox Hunt, Beacon, Model Rocket or Balloon Payload Telemetry.

160, 80, 20 and 10 Meter versions available.
Check our other auctions 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.

Q6-8

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Pay only $10.00 shipping for orders of 8 or more eligible items from pbsn6040.
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Item location: South Central, United States
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United States
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*The estimated delivery time is based on the seller's handling time, the shipping service selected, and when the seller receives cleared payment. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.
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