Astatic ALL1K 1000 Watt High Performance Linear Load Antenna CB Antenna

Introducing the New Benchmark in Radiation Efficiency!

Through the exclusive integration of Linear Load design technology, Astatic has created the most efficient CB/10m antennas available for practical applications.

When connected to your radio, these antennas provide superior range, outperforming all other antennas incorporating a coiled or loaded design

The Linear 1K offers the maximum in broadband tuning. By transmitting lower SWR across the band, the antenna actually increases your channel capabilities. The benefit translates to near equivalent SWR on channels 1-40 (less than 1.5 : 1).

When it becomes necessary to reduce the length of a resonant radiator, theory dictates a trade-off in radiation efficiency.

For years, antenna manufacturers have conveniently resorted to "eating up" the length (hence the radiating aperture) of an antenna by employing "inductive loading" in the form of coils placed in series with a linear antenna. This, in fact, shortens the physical length of that antenna making it mechanically manageable. This is deemed a plus since the now shortened antenna, when used in a vehicular applications, tends to be far less susceptible to damage from tree branches, overhead wires and the more solid highway overpasses, just to name a few of the many common hazards.

However, that's where the pluses end and the trade-offs kick in. Series-coiled inductors radiate little, if any, signal. Furthermore, the physical placement of a coiled inductor during the design stages of a loaded antenna is quite critical to the radiation efficiency of the antenna. one must keep foremost in mind that when dealing with quarterwave radiators, the most common vehicular antenna in use, the lower section does the majority of the signal radiation. hence, the interruption of the lower extremities (at or close to the base of the antenna) of the quarterwave with a coiled load, immediately detracts from the overall radiation efficiency that would have been possible by smarter design. In addition, the highest r.f. currents exist closest to the lower extremities of a quarterwave. This automatically makes a coil inductor a "hot spot" that is vulnerable to heating when carrying high .r.f currents indicative of high transmitter output power levels. This immediately reduces the duty cycle of the antenna for transmitting high power levels and burn-out is eminent.

The Astatic Linear Series models have been designed while keeping in mind all of the aformentioned pitfalls present in conventional antennas.

This new generation of upgrade antennas innovatively employs the high-tech concept of linear loading.

Basically, linear loading maintains the radiation efficiency that has been robbed from conventional antennas using coil inductors within the major current radiation portion of their length. The linear load radiates signals in addition to moving the loading of the antenna away from the base to less meaningful radiation portions of its length - the center and the top.

Exact antenna range measurements place the Astatic Models on 3/10 of 1dB difference in radiated signal from full length, 108" quarterwave whip. Not bad since 3/10 of 1dB ins not perceptible in practical service and it beats the nearest competition considerably.

The Astatic models also exhibit excellent bandwidth. Over 1 MHz is available at any whip setting with VSWR less than 1.5:1. A single whip setting allows the Astatic 1K to be used very effectively for any 2 MHz segment in the range from 26 to 30 Mhz.