(12) pc 6-Band Low Power QRP HAM TRANSMITTER Assortment (from 160 to 6 Meters)

$22.95 Buy It Now or Best Offer
free,30-Day Returns

Seller Store bootsparts
(10010) 100.0%,

Location: Garland, Texas
Ships to: US,
Item: 351052541934

Return shipping will be paid by:Buyer
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money back or replacement (buyer’s choice)
Compatible Brand:Universal
Multiple Manufacturers:Multiple Manufacturers
Type:Crystal Oscillator
Package Style:See Description
MPN:Does Not Apply
Band:AM HF SW VHF Amateur Bands

(12) Piece QRP Transmitter Assortment – Multi-Band / Frequency 0909 Most purchases qualify for a ** Combined Shipping Discount ** Fast eMail Fast Shipping Guaranteed Good-on-Arrival 6 HAM Bands in a Variety of Package Styles and Features DIP-8 & 14, Shielded Metal CAN, SMD, OE, VCXO See below for Detailed Table, Datasheets, Schematics and MORE! HAMs, this QRP assortment has something for everyone! These miniature transmitters (a.k.a. crystal controlled clock oscillators) operate in the HAM bands. You get twelve frequencies in 6 HAM Bands. (#11, the 50.000 MHz unit, is right on the band edge and depending on the tolerance, some may fall outside the band.) Over half have an Output Enable (OE) feature. (See description, schematics and table below.) All but one are fixed frequency. The exception, #10, 10M VCXO, tunes ± 6 KHz with a variable 0 ~ +5 VDC to pin (1). Tune around the pileup or experiment with NBFM communications. 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. Items #7 and #12 are SMD but the leads are curled around the bottom and can be straightened or bent outward for easy soldering to the foil side of a PCB. Note: You are buying the (12) QRP Transmitters ONLY. The application drawings and notes below are for information only and the other parts are NOT included. Standard CW Mode (below): Use this method if your receiver has a BFO or product detector. It’s the simplest configuration for all units. Note the location of pin (1) viewed from the top. The 0.001 µF bypass cap will increase stability if leads are long. It doesn’t get any simpler! Snapshot of 6-Band QRP Assortment Band FMHz Style PN Fig. Feature 160M1.8432DIP-8SG-531P1Output Enable 80M3.6864DIP-14SG-51K2 40M7.2000Metal Can (DIP-14)AE 404-3863Shielded 20M14.1523Metal Can (DIP-14)Motorola IBM144Shielded 20M14.3180DIP-8SG-531P5Output Enable 20M14.31818Metal Can (DIP-14)NDK 26F48446Shielded, Output Enable 10M28.3210SMDSG−615PH7Output Enable 10M28.3220DIP-8SG-531PT8Output Enable 10M28.6363DIP-14SG51KT9 10M28.672Metal Can (DIP-14)ECLIPTEK ECXO−93210Shielded, VCXO, NBFM ± 6 KHz 6M50.000Metal Can (DIP-14)KDS DOC-7OZA11Shielded, Output Enable 6M50.3500SMDSG−615PH12Output Enable Output Enable pin (1): +5 V enables; ground to disable. VCXO freq shown with +2.5 volts applied to pin (1). Datasheets are available for some devices. SG-531P/PT https://linearparts.com/documents/SG-531P.pdf SG-51K/KT https://linearparts.com/documents/SG-51KT.pdf SG−615PH https://linearparts.com/documents/SG-615PH.pdf ECXO−932 https://linearparts.com/documents/ECXO-932.pdf Wiring Notes: All of the ICs have the same 4-corner pin arrangement. Schematics are shown with a top view. Reference pin (1) is either unused or the OE pin as defined in the table above. Depending on whether the package has a DIP-8 or DIP-14 footprint, the pin to the right is either pin (4) or (7) respectively and is the Ground pin. Similarly, the top right pin is the Output pin (5) or (8). Finally, the top left is pin (8) or (14) and goes to the +5 VDC. The Basic Transmitter 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. LONG RANGE PERFORMANCE Of course range varies widely and avid QRP’ers know that it’s the Antenna, Antenna, Antenna that is the key. But as an example, I’ve taken 6M and 10M units on the road, using just a short wire antenna (~6 ft, untuned) draped over the car seat, and they still reached out over 1½ miles to a receiver connected to a roof level vertical. But the real potential comes with elevated antennas at both ends, especially beams. I estimate an RF output of 40 mW or more into a 50 Ω load is possible with a 5.5 Volt supply. Other Applications: Fox Hunt Beacon Telemetry Model Rocket or Balloon Payload Remote Intrusion or Sensor Alarms Morse Code Classes Elmers, add some excitement and realism to your code practice sessions by actually going ON AIR while you teach real life NET operating skills! TRY THIS: Place a receiver in the classroom, and let several neophytes take turns at the key to “call” and communicate with each other using only their CW skills. No talking allowed. This is a fun and effective learning tool. Suggested DIY Low Pass Filters (LPF) Note: This section is for information only. LPF parts are NOT included. These are QRP transmitters so harmonics are even weaker, but you can make your own filter if you experience interference with nearby receivers. (This plan is for informational purposes only. This auction does NOT include LPF parts.) The cutoff for this 20 Meter example is 19 MHz, well below the 2nd harmonic but with a wide buffer zone so loose part tolerances won’t choke the fundamental frequency. The 0.66 µH air core inductors can be handmade by close-winding 15T #22 on a ¼” form. For other wire sizes and/or coil dimensions there are Air Coil Inductance Calculators on the internet to ‘roll your own’. 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. To adjust this design for other cutoff frequencies, it is important to understand that the component value changes will be inversely proportional to the frequency change. In other words, to double the cutoff frequency, halve the part values, and vice versa. Take the 160 Meter transmitter at 1.8 MHz for example. A 3dB cutoff at 2.5 MHz would work just fine. The 20 Meter LPF example is designed for 19 MHz. So to decrease the cutoff frequency, the part values need to be increased by the ratio of 19/2.5 = 7.6. Multiply all the values by 7.6 to calculate the values needed for the 2.5 MHz cutoff. The coils jump to 5 µH and the caps rise to 1520 pF / 2736 pF / 1520 pF. These are not standard values but they are not critical due to the wide buffer zone between the fundamental and 2nd harmonic frequencies. Check the ARRL Handbook for more information. They have normalized tables for many other LC combinations that may make a better match with your Junque Box inventory. Please, no substitutions allowed in this assortment, but additional quantities are available for some items. If you’ve read all the way down to here and still have questions, please email us. 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. QXB 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 (no 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

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