DEM 1420ULNA - 1420 MHz. Ultra Low Noise Amplifier
>6dB @ design frequency
>10dB DC - 3 GHz.
+7 - +16 VDC
The DEM1420ULNA is one of a series of Ultra Low Noise Amplifiers that shares a common
design produced by Down East Microwave Inc. from 900 MHz. through 1700 MHz. Each model is
optimized for it’s own specified frequency. The ULNAs utilizes the latest in PHEMT technology and
is designed for receive systems such as EME stations and weak signal satellite reception requiring
the lowest noise figure as possible. All of the ULNAs are receive only and do not provide any RF
bypass switching circuitry. Standard gains of our ULNAs range from15 - 18 dB. All noise figures for
this series of ULNAs are below 0.4dB. The ULNAs are adjusted on an individual basis for the best
performance possible. This is accomplished with an internal negative voltage power supply that is
separate from the RF circuit and providesDpaotwaSehreseut4pUp.lcyoimsolation for the FET.
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 returning if a cable length or the tuning of a filter
that is connected to the output of a tuned circuit LNA is changed.
This ULNA design is provided with type “N” connectors that are mounted on a weather
aluminum enclosure that measures 3.75” L
standard die cast enclosure if desired. Both
x 2.5” W x 1.375”
of these enclosures
H. It is also
DataSheet4 U .com