(12) pc 6-Band Low Power QRP HAM TRANSMITTER Assortment (from 160 to 6 Meters) Multiple Manufacturers Does Not Apply
Характеристики
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6 HAM Bands in a Variety of Package Styles and Features
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Price is for a set of (12) different QRP Transmitters like the ones shown above. Some HAM bands have multiple frequencies; some, just one. See the detailed list to the right. |
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Datasheets are available for some devices. SG-531P/PT https://linearparts.com/documents/SG-531P.pdf | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Below is a simple Modulated CW (MCW) circuit. Use this circuit for CW communications if you have an AM-only receiver. Different resistors at pin (6) or capacitors at pin (2) in the NE555 timing circuit will produce different tones to distinguish different transmitters. Substitute a thermistor for the timing resistor [33K at pin (6)] for a simple temperature telemetry transmitter. | Below is the optional wiring for the Output Enable (OE) devices. This configuration allows the oscillator to run continuously while keying the OE pin to turn the output on and off. See the table above to identify which ones have the OE function. ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | AM operation is easy with the addition of a small audio transformer. You can use any audio source intended to drive a speaker. Note the reversal of PRI-mary and SEC-ondary windings. The impedances are not critical and almost anything close will work. ![]() |
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This basic design is from the ARRL Radio Amateurs Handbook and is very easy to modify for other frequencies. We suggest choosing a cutoff midway between the transmit and 2nd harmonic frequencies. A cutoff well above the transmit frequency will relax part tolerances while still ensuring effective attenuation well ahead of the harmonics. |
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Note: Configurations and applications vary and performance varies. Please review FCC Rules and Regulations Part 15 and Part 97 if you are not certain your particular use is in compliance. The suggestions above are not intended to promote 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. |
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** We offer a Combined Shipping Discount for most purchases (excluding books)
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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 / 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. |