LOGI LOW FREQUENCY MODIFICATION

If your radio system requires DC isolation or you plan to use your Logi below 900 MHz, the small connecting traces near the rear of the antenna should be cut. By removing these traces you can extend the effective frequency range down to 825 MHz. You will however

wind up with some ‘lumps’ in theSoldered Coax Positioning matching response on the high

frequency end.

BUILDING A CORNER REFLECTOR

Corner reflector antennas have long been used by the Military and Radio Amateurs for high forward gain applications like field data links. Using a properly sized 90° angle corner reflector will typically give you a 10 dB gain or higher over that of a stand alone dipole

antenna. The construction of a traditional corner reflector is very simple. Two plates are connected at a 90° angle with a feed element, usually a dipole, positioned along the vertex at the angular focal point of the plates. The dimensions of the reflector plates are luckily not critical (within reason of course) and the frequency characteristics are much better than most other parasitic arrays with the same gain rating. One drawback of the normal corner reflector arrangement is the fact that the active (radiating or receiving) element is usually a narrow bandwidth dipole. In our case, we suggest using the ‘broadband’ Logi as the feed element. This gives you the same corner reflector benefits but without the normal narrow bandwidth limitations!

With the wealth of information available today on the Internet, countless articles and design schemes can be found covering the construction of corner reflectors. The main difference from the norm is the use of the Logi as the main element versus a simple dipole. The following diagram gives a few basic

dimensions for an experimental corner Final Installation View reflector. The main points to key in on are

the base reflector size and the element (the Logi) placement for proper broadband coverage.

Different types of materials can be used to form the reflector plates. Any type of perforated aluminum or copper sheet will work well. Small holes in the material help to cut down on wind resistance. The overall reflector length and width sizes should be chosen to properly work at the lowest

LPY2 • 6

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Ramsey Electronics LPY2 manual Logi LOW Frequency Modification, Building a Corner Reflector
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LPY2 specifications

Ramsey Electronics LPY2 is a versatile and highly respected model renowned for its impressive performance in low power FM transmitters. This device stands out in the field for both amateur and professional use, making it a popular choice for various broadcasting applications.

One of the key features of the LPY2 is its simplicity and ease of use. Designed for ease of assembly, it is suitable for hobbyists and individuals looking to delve into the world of radio transmission without a steep learning curve. The kit comes with clear instructions, making it accessible for users with varying levels of technical expertise.

The LPY2 operates within the FM broadcasting band, typically covering a range of 88 to 108 MHz. This capability allows users to transmit audio signals over a significant distance, depending on the antennas used. Its effective range typically spans a few hundred feet to several miles, making it ideal for small community radio stations, personal broadcasting, or event-specific applications where a localized signal is needed.

Technologically, the LPY2 integrates various features that enhance its performance. It utilizes a low-noise oscillator and a power amplifier, which improves the signal quality and range without compromising clarity. The transmitter is built using discrete components, ensuring minimal interference and high stability, critical factors for clear audio transmission.

A notable characteristic of the LPY2 is its adjustable output power. This flexibility enables users to tailor the transmission strength according to their specific requirements, whether to maintain a low profile or to ensure broader coverage. The device also features built-in modulation for varied audio input, allowing users to connect various audio sources like microphones or music players seamlessly.

Additionally, the LPY2 is noted for its robust build quality and reliability. Built to withstand continuous use, it includes protective measures against over-voltage and overheating, ensuring its longevity in various environments.

When it comes to connectivity, the LPY2 includes standard RCA audio inputs, making it compatible with a wide range of audio devices. This compatibility is essential for users who want to diversify their content sources and enhance the broadcasting experience.

In conclusion, the Ramsey Electronics LPY2 is a formidable choice for anyone interested in low power FM broadcasting. With its user-friendly design, flexibility in output power, and high-quality audio transmission capabilities, it serves as an excellent tool for both novices and experienced broadcasters looking to make their mark in the radio spectrum. Whether it’s for personal projects or more extensive broadcasting initiatives, the LPY2 delivers reliable performance and excellent features tailored to its users' needs.
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