Check the listing for details. (10) 10-Meter Crystal Controlled QRP Transmitters - SORTED by FREQUENCY. Condition: New. Listed at 15.95 USD. Novice / Technician 10 Meter QRP Transmitter or Wireless Alarm 0813 Most purchases qualify for a ** Combined Shipping Discount ** Fast eMail Fast Shipping Guaranteed Good-on-Arrival Sold in SORTED lots of (10) pcs Grouped by FREQUENCY for a MAXIMUM SPREAD of 120 Hz between the highest and lowest unit. Note: If you purchase multiple lots at the same time, we will ship the whole order from one 120 Hz sorted group. Datasheet for Epson SG-531PT: https://linearparts.com/documents/SG-531P.pdf Epson Catalog Datasheet: https://linearparts.com/documents/SG-51KT-cat.pdf Go CW, MCW or even AM mode! Amateur Radio HAMs, get your 10 Meter QRP NET on the air FAST and SIMPLE with these self contained low-power transmitters. Price is for (10) units, sorted by frequency. All (10) will be within a 120 Hz spread. Also, the group will be within 1 KHz of 28.322 MHz. These are clock oscillators in a DIP-8 style package. The nominal 28.322 MHz frequency falls nicely inside the Novice / Tech segment of the 10 Meter HAM band (28.0 to 28.5 MHz). Add realism to your code practice sessions by actually going on the air as you learn real life NET operating skills! If your receiver has a product detector or BFO, use these in CW (Carrier) Mode. If you are using an AM-only receiver, just add a simple modulator, such as the linked example below, for MCW (Modulated CW). Choose different values of timing resistors and capacitors for different tones. EXTREMELY SIMPLE WIRING - Standard or OE Standard CW Mode: Just ground pin 4, connect a LPF and antenna to pin 5 and key +5 VDC to pin 8 (shown below) and you're on the air. (Add a 0.001µF bypass directly across pins 4 & 8 for improved oscillator stability.) Can't get any simpler! Alternate OE keying [ https://linearparts.com/images/SG531P-QRP-OE-alt-sch.jpg ] uses the Output Enable pin 1. When pin 1 is held low through a 1 K resistor, the output at pin 5 is turned off, but the oscillator is kept running. Key +5 volts to pin 1 in this configuration for computer generated Morse code. LONG RANGE Of course range varies widely and experienced QRP'ers know that it's the antenna, antenna, antenna that is the key. But as an example, I took a QRP Xmtr w/LPF Assembly (not included https://linearparts.com/images/QT-pcb-420x200b.jpg ) and GPS tracker on the road. I grounded pin 4 to the car and draped an antenna wire over the seat. As the crow flies, it was still readable over 1½ miles away on an IC-746 connected to a roof level vertical. Imagine what it will do when you connect it to your beam! [The output is TTL so use a Low Pass Filter (not included https://linearparts.com/images/10M-LPF.jpg ) to suppress harmonic radiation to nearby equipment. TV channel 2 is the second harmonic. See our other listings for 0.33 uH inductors used in an LPF Filter] Modulated CW (MCW) Mode Schematic Example: https://linearparts.com/images/DIP8-2300-MCW-QRP-SCH.jpg AMPLITUDE MODULATION AM operation is possible by adding a small audio transformer. (Transformers are not included, 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. WIRELESS ALARMS - Anywhere Wire a door, gate, pool level detector, thermostat -- anything that can switch 5 Volts. Use 4 AAA batteries and a diode to drop the voltage to about 5.5V. For short distances, an antenna is not needed. A stable receiver or scanner can cover the perimeter of your yard. Carrier Mode (CW) is the simplest method. However, if you prefer a tone, a simple 555 oscillator, such as the one shown in the MCW schematic link above, will modulate the transmitter. Different resistors and capacitors will produce different tones for easy identification of different monitoring / alarm stations. For a different twist, replace the 33K timing resistor with a thermistor to make a temperature telemetry transmitter. Other possibilities: 10M Fox Hunt Beacon Telemetry (less than ¾ gm, perfect for helium balloon flights) Model Rocketry 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, 40, 20, 6 and other 10 Meter versions available. Check our other listings or e-Mail us. Retail price - $3.72 each. --> 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. QTS-10 800 pixels REVISED Rev11/05/20 added sentence to check our store for other listed quantities --> ************************************* ham radio etronic e-tronic hamtronic qba BootsParts USA boots PAYMENT and SHIPPING ** We offer a Combined Shipping Discount for most purchases (excluding books) if paid with ONE SINGLE PAYMENT with eBay's SHOPPING CART ** Condition of Goods Unless otherwise noted above: NOS (New Old Stock) or better, clean, unused 30 day Non-DOA, Good-on-Arrival Guarantee Untested, but NO JUNK or suspect parts PCB parts are thru-hole, NO SMD/SMT Small parts may be bulk packed Manufacturers and Date Codes may vary Attention International bidders only: Sorry, we ship to US ZIP Codes ONLY. We DO NOT ship Internationally. We ONLY ship to Registered US addresses. We DO NOT accept INTERNATIONAL payments. 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 / or old stock commonly known in the parts business as 'NOS' (New Old Stock). Some of our stock pictures show date codes which may vary from the actual product shipped. Parts from a larger OEM package may be repacked for smaller lot size orders or for more practical handling and shipping. See our store for other listed quantities. We strive to give full and accurate descriptions to earn your 5-Star Feedback. Any known deficiencies are listed in the detailed description. Datasheets are provided when available. Some datasheets may be close but not a perfect match because of part revisions or because they may be from a different manufacturer. If you have any questions concerning our products please email us before purchasing. Your complete satisfaction is important to us before and after the sale. Thank you. 111521