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LNY Receiver Preamp

You can hear the weak ones, too, and without spending a fortune!

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.

MODEL TUNES  RANGE FACTORY PEAKED TYP. NOISE FIGURE GAIN MIN. 3DB BANDWIDTH
LNY-50 35-63 MHz 52 MHz0.6 dB 24 dB 3 MHz
LNY-100 88-108 MHz 100 MHz0.6 dB 22 dB 5 MHz
LNY-120108-1401220.6 dB22 dB4 MHz
LNY-137 130-160 137.5 MHz0.6 dB 18 dB 4 MHz
LNY-146 130-160 146 MHz0.6 dB 18 dB 4 MHz
LNY-166 150-180166 MHz0.6 dB 16 dB 5 MHz
LNY-220195-240224 MHz0.7 dB 18 dB 5 MHz
LNY-400360-400400 MHz0.8 dB19 dB5 MHz
LNY-450400-470448 MHz0.8 dB 18 dB 5 MHz

Note:  Units are easily re-peaked at your operating frequency after installation. They are stocked tuned to center frequency indicated above. If you prefer, we can custom tune to your frequency at an additional charge of $20.


FEATURES:

  • Small Size: only 1 x 2-1/2 x 5/8 in. high
  • Low noise figure to hear weak signals.
  • Rugged, diode-protected, dual-gate silicon FET's.
  • Wide dynamic range for overload resistance. (1dB compression @ +5dBm)
  • Easy to tune
  • Operates on +9 to +15Vdc @ 10mA; no special power supply required.
  • RCA style RF input/output connectors for easy connection. (sorry, cannot change to other types of connectors)

PRICES:

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
Often, we are asked if the +12Vdc power for the preamp can be fed up the coax cable from the receiver for installations where the preamp is mounted at the antenna. We have long resisted the temptation to try to save a few cents on some light-weight hookup wire by using this trick, feeling that chances of messing up the rf performance are too great.
We now offer a kit for those who want to try this anyway. It consists of the rf chokes and dc-blocking capacitors needed for both ends of the cable, at the receiver and the preamp, along with general instructions. It may be used on any frequency from 130-500 MHz.

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.