Ramsey Electronics SR2 manual

Page 17

ˆ33. Install R2, 22K ohms [red-red-orange].

ˆ34. Install R1, 100K ohms [brown-black-yellow].

ˆ35. Install C24, 1µF electrolytic capacitor. Remember to watch polarity when installing.

ˆ36. Install C5, 100 pF disc capacitor [marked 100, 101, or 100K].

ˆ37. Install C4, .01µF disc capacitor [marked .01, 103, or 10nF].

ˆ38. Install R26, 100 ohms [brown-black-brown].

ˆ39. Install C23, 10 µF electrolytic. Remember to check the polarity before installing.

ˆ40. Install Q2, the last 3904 transistor. Check the parts placement diagram for correct orientation, then install and solder the three leads.

ˆ41. Install C6, .01µF disc capacitor [marked .01, 103, or 10nF].

ˆ42. Install R4, 22K ohm [red-red-orange].

ˆ43. Install T1, one of the shielded can inductors [marked 42IF-103].

ˆ44. Install R5, 100K ohm [brown-black-yellow].

ˆ45. Install R6, 10K ohm [brown-black-orange].

ˆ46. Install C28, .01µF disc capacitor [marked .01, 103, or 10nF].

ˆ47. Install C7, .1µF ceramic disc capacitor [marked .1 or 104].

ˆ48. Install R7, 1K ohm [brown-black-red].

ˆ49. Install C31, .0039 uF disc capacitor [marked 392 or 392K].

ˆ50. Install R8, 10K ohm [brown-black-orange].

ˆ51. Install C8, .01µF disc capacitor [marked .01, 103, or 10nF].

ˆ52. Install D1, 1N270 glass bead style diode. The banded end (cathode) MUST be oriented as shown on parts layout.

ˆ53. Install R11, 10K ohm [brown-black-orange].

ˆ54. Install R10, 1K ohm [brown-black-red].

ˆ55. Install R9, 1K ohm [brown-black-red].

ˆ56. Install T2, the other shielded can inductors [marked 42IF-103].

ˆ57. Install L3, 12 µH inductor [looks like a fat resistor with brown-red- black bands].

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Contents Shortwave Radio Partial List of Available Kits Ramsey Transmitter Kits Shortwave Radio Table of ContentsWhat YOU can Expect to Hear Introduction to the SR2Shortwave Listening AS a Hobby Circuit Description SR2 SR2 Parts Layout Diagram SR -2 Block D iagram Inductors Parts List CapacitorsResistors SemiconductorsOptional Hardware and MiscellaneousREQUIRED, not Supplied Enough said... Let’s get building Assembly InstructionsSR2 SR2 SR2 SR2 SR2 Progress Summary Shortwave Antenna Ideas Initial Testing and Adjustment C16 = T3 Slug T3 Slug Out Troubleshooting Tips Other Enclosure Recommendations Tuning DIAL?Ramsey Electronics CASE, Knob & Hardware Option Freq Country MHz Sample Shortwave LoggingsSample Shortwave Loggings Con’t Freq Country MHz SR2 Ramsey Kit Warranty Required Tools Estimated Assembly TimeAdditional Suggested Items Total Solder Points

SR2 specifications

The Ramsey Electronics SR2 is a versatile and robust RF transmitter designed for a range of applications, including hobbyist projects, educational purposes, and practical uses in the field of amateur radio. Its compact size and user-friendly design make it a popular choice among enthusiasts and professionals alike.

One of the standout features of the SR2 is its frequency range, which typically spans from 88 MHz to 108 MHz. This wide range allows users to operate within the FM band, making it suitable for transmitting audio signals, music, or voice communications. This flexibility is particularly advantageous for those interested in creating their own radio stations or conducting experiments in radio frequency communication.

The SR2 utilizes advanced technology to ensure high-quality transmission. It incorporates modulation techniques that enhance audio clarity and reduce noise, resulting in a smoother listening experience. The transmitter is also equipped with a low distortion audio preamplifier, ensuring that sound quality remains pristine even at higher transmission stages.

Another important characteristic of the SR2 is its ease of assembly. The kit comes with all necessary components, including a printed circuit board (PCB), which simplifies the building process for users. Detailed instructions guide the user through the assembly, making it accessible even for those with limited electronics experience.

The SR2 also boasts a power output of approximately 100 mW, allowing for a transmission range of up to several miles, depending on the surroundings and antenna used. This power level strikes a balance between effective transmission and energy efficiency, catering to various operational settings.

In terms of design, the SR2 features a compact enclosure that protects the internal components from dust and damage, which is vital for maintaining reliability in various environments. Its user-friendly interface includes adjustable controls for tuning and volume, enabling users to customize their transmission settings easily.

Additionally, the SR2 is compatible with a variety of external audio sources, such as microphones, CD players, and smartphones, enhancing its versatility. The unit can be powered by standard power supplies or batteries, making it suitable for both portable and stationary use.

Overall, the Ramsey Electronics SR2 is a well-designed RF transmitter that combines quality, functionality, and ease of use, making it an excellent choice for anyone looking to explore the world of radio transmission.
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