Low Noise Amplifiers

Our SuperLNAs have:.

• High sensitivity to weak signals when high level signals are present. This is referred to as "Dynamic Range". This helps prevents intermodulation (intermod).

• A Low Noise Figure. This is the amount of random/thermal noise generated within the amplifier.

• Are built to your needs. A well designed LNA System must not exceed a net gain of 20 db for receivers without built-in LNAs, This means that if you have a -60 dbm signal at the connector on the receive antenna and amplify it, the amplified signal level, minus the loss of the transmission line, connectors, etc, must not be any higher than -40 dbm at the receiver. In congested areas, a net gain of 10 to 15 db is practical in order to mask the receiver's noise figure (conversion loss plus transistor noise, plus other losses in the receiver). LNAs used with receivers with built-in LNAs, should have a net gain of 3 to 6 db.
  
  The Power Output of our LNAs is also set for your individual needs. It is usually designed for a 6 to 10 db headroom above the highest anticipated signal. This helps prevent intermodulation.

Be careful. Too much gain will decrease your range! In no case should any signal, on frequency or off frequency, exceed -30 dbm at the input to the receiver. If the receiver has an internal LNA, the highest average signal level applied to the receiver should not exceed -40 dbm. The reason for limiting strong signals, including any adjacent channels, is to prevent INTERMOD (signals mixing with each other and actually modulating each other. This usually occurs in the mixer stage of the receiver).

.LNAs, like shoes, require a careful fitting. Call us and tell us what you have, and we'll give you a choice of LNAs or complete lightning proof LNA System(s) for your site.

We also design systems to your special needs. These include multiple receive antennas throught the same Heliax to reduce costs and tower loading. Transmit capabilities may be added to your ENG receive system to allow additional TSLs.

It is not currently advisable to switch to an LNA system only for the new bandplan, because of the heavy Common Carrier microwave traffic (Cell Site links), in the 2110 to 2130 Mhz area. You can, however, order a Dual Filter SuperFilter/LNA System from us, that will eliminate PCS now, and with the flip of a switch, put you on the new band! The new bandplan will still require heavy PCS Filtering, in addition to MSS Filtering.

Block "C" PCS, 1975 to 1990 Mhz, is now being used. The stations that bought Brand New ENG Receivers, instead of our SuperFilter/LNA, are now in deep shi trouble!

Call LLoyd @ 1-888-828-8775

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