Hamtronics LNY-50 Preamo

LNY Receiver Preamplifier

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

No need to spend $110 or more for a good, low-noise FET preamp! Our LNY-( ) Preamp is only $29,wired/tested.

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 galium arsenide at vhf and uhf frequencies. New techniques provide better noise figure than we got with comparable GaAs FET's only a few years ago.

Some units you may see on the market use triode fet's designed for microwave, and they are not always stable when operating at vhf and uhf frequencies. Most don't have any built in diode protection; so they must be handled very carefully. Some companies even use bipolor transistors, which are cheap but notorious for intermod. The FETs used here are designed exclusively for use at these frequencies; so they don't easily oscillate. And replacement fet's are relatively inexpensive.

Surface mount technology is used to obtain minimum noise figure and best stability. We are able to produce these preamps wired and tested for the same price kits cost for earlier models. Therefore, they are offered only as fully factory assembled and tested units.

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.

FEATURES:

Miniature Preamp, only 1 x 2-1/2 x 1/2 in. high.
Easily mounts inside many radios.
Low noise figure to hear weak signals.
Rugged, diode-protected, new-generation dual-gate silicon FET's.
Wide dynamic range for overload resistance. (1dB compression @ +5dBm)
Operates on +12 to +15Vdc @ 10mA; no special power supply required.
RCA input/output connectors for easy connection.
Easy to tune
Shipping weight 1 lb

MODEL	TUNES RANGE	FACTORY PEAKED	TYP.NOISE FIGURE	GAIN	MIN. 3DB BANDWIDTH
LNY-50	35-63 MHz	52 MHz	0.6 dB	24 dB	±3 MHz
Note: Units are easily repeaked 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 $10. However, if your operating frequency is within 2-3 MHz of the center frequency specified, special tuning is unnecessary.

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.

65 Moul Rd., Hilton, NY 14468-9535

www.hamtronics.com

Support and Orders: (585)-392-9430