DEM33ULNA Datasheet | DEMI

Description: The DEM ULNA is a series of Ultra Low Noise Amplifiers intended to be used for Radio Astronomy applications, amateur EME munications or weak signal satellite reception This series of ULNA’s produced by Down East Microwave Inc. share a mon design from 900 through 1800 Data Shee MHz. Each model listed above is optimized depending on the frequency requirement. The ULNAs . utilize the latest in PHEMT technology and are designed for applications requiring the lowest noise figure possible. All of the ULNAs are receive only and do not provide any RF bypass switching circuitry. Standard gains of our ULNAs range from15 - 17 d B depending on frequency. All noise figures for this series of ULNAs are below 0.4d B. The ULNAs are adjusted on an individual basis for the best performance possible. Our ULNA design incorporates a low loss series inductor input circuit and a resistive loaded output circuit. During testing, the input circuit is optimized for gain and noise figure. The resistive loaded output circuit, is adjusted to control the gain and is tested for a constant wide bandwidth output impedance. This resistive load impedance absorbs products caused by reflections from band pass filters or high Q receiver front ends. We do not use tuned output circuits or baluns in our ULNA designs. Tuned output circuits and baluns do not offer constant output impedances over wide bandwidths and may cause out of band instabilities from reflected signals. . Tuned circuits may also require readjusting if a cable length or the characteristics of a filter changes. /PD/ulna.doc Data Sheet 4 U . 11/25/02 .. The ULNA’s can be provided with type “N” or SMA connectors that are mounted on a weather proof die cast aluminum enclosure that measures 3.75” L x 2.5” W x 1.375” H. This designis also available in a standard die cast enclosure if desired. Both of these enclosures enhances RF insusceptibility and protects against stray external EMI. DC power is applied through a Pi-circuit...