Unlike other FET preamps on the market, this one uses one of the new-generation, very-low-noise, dual-gate MOS FET's which are designed exclusively for use in the vhf & uhf bands. They have built-in diode protection and very low feedback capacitance, resulting in good stability and rugged performance under a wide range of voltage, signal, and load impedance conditions. Note that there is a recent trend to use silicon rather than gallium arsenide at vhf and uhf frequencies. New techniques provide better noise figure and stability than we got with comparable GaAs FET's only a few years ago.
Surface mount technology is used to obtain minimum noise figure and best stability.
The preamp is connected in series between the antenna and the receiver to effectively lower the noise figure of the receiver front end, allowing weaker signals to be received. The LNY series was designed for operation in 50 ohm systems; however, they will operate satisfactorily on 75 ohms as well.
LNY-( ) Preamp, wired/tested ...$79.00 (specify model from chart at left)
Tuning charge if you want it tuned to custom frequency ...$20ote:
PF-1 Phantom Power Kit option ...$5.00
WHEN IS A PREAMP BENEFICIAL?
It is tempting to hope that a preamp can make any receiver more sensitive, in any situation. But, it is important to understand what happens when you add a preamp before a receiver.
A preamp can help overcome a deficiency in receiver sensitivity only if the noise figure is poor, either due to the design or because a lossy filter or cable adds to the noise figure. For instance, a preamp up at the antenna can overcome the effects of coax cable loss.
However, adding gain in the front end raises all signal levels; so, in effect, every dB of gain added overrides one dB of if selectivity or dynamic range. Therefore, adding a preamp can result in intermod or desense. The only way to know is to try it.