Kit/Combo Contents

The Radio Source 630PD-A - The Radio Source Medium Frequency Antennas

BOX A 630PD VERTICAL ANTENNA, Contains Pipe Sections

Kit Item Quantity: 1

The Radio Source 630PD-B - The Radio Source Medium Frequency Antennas

BOX B 630PD VERTICAL ANTENNA, Contains Antenna Coil Section, Hardware & Instructions

Kit Item Quantity: 1

Overview

The Radio Source 630PD Lowdown 630-Meter Vertical Antennas

The Radio Source 630PD Lowdown 630-Meter Vertical Antennas provide Amateur Radio operators with an efficient and practical solution for operating on the 630-meter band in locations where space is limited. Compact, lightweight, and easy to install, these antennas deliver impressive performance without requiring a large area or tall support structures.

Designed for installation above a horizontal ground radial system, the 630PD utilizes an inductively center-loaded, base-fed configuration with a capacitive top hat to maximize efficiency while maintaining a remarkably small footprint. Its rugged yet lightweight construction makes setup, takedown, transportation, and storage simple.

The antenna is intended for ground-level installation over a horizontal radial field consisting of radials approximately 10 to 25 feet in length. When used with a ground system of 32 radials measuring 25 feet each and operated at typical input power levels of 100 to 200 watts, the antenna can produce an effective radiated power (EIRP) of approximately 2 to 4 watts, depending on local ground conductivity. At its maximum rated input power of 250 watts, EIRP can reach or exceed the FCC's 5-watt limit for the 630-meter band.

The Lowdown 630PD is mounted to a ground support using insulated block clamps that secure the lower antenna section at two points approximately 18 to 24 inches apart. Installation is typically accomplished using a treated 4x4 or 6x6 wooden post set into the ground, leaving 3 to 4 feet exposed above grade. The upper clamp is mounted near the top of the post, with the lower clamp positioned at least 24 inches below to provide secure vertical support.

For easier tuning and maintenance, a tilt-over mounting arrangement may also be used. An optional transmission line impedance transformer can be attached directly to the mounting post, with a short jumper connecting the transformer to the antenna feed point. Ground radial connections can be made conveniently using a copper or aluminum grounding ring installed around the mounting post, providing a simple and cost-effective method for attaching the required radial system.

The result is a highly efficient, mechanically durable, and exceptionally compact antenna system that makes 630-meter operation practical for stations with limited space.

Documentation

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