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You are here: hb9bbd.ch >> articles >> Cavity LNA for 1296 MHz Amateur and 1420 MHz SETI

Cavity LNA for 1296 MHz Amateur and 1420 MHz SETI
Category: EME Equipment, Created: 2007-03-16 10:55:17

The LNA (low noise amplifier or 23cm preamp) has been designed for small signal applications, primarily EME and SETI.It offers gain in the order of 40dB and a Noise Figure between 0.15 and 0.2 dB.
Improvement to previous performance is based on replacing the NE32484A by the MGF4919G.
These devices are obsolete for many years but there are enough in stock to guarantee production and repairs.
Each unit is documented with detailed specification as Agilent 8975A test protocol, graph of both gain and NF. Testequipment in use is the Agilent 8975A with N4000A noise source.
Connectors are SUHNER SMA male or female. N connectors as well as SMA(male) are available on request.
The cost per unit without shipping is EURO 650.

.. typically NF is 0.2-0.23dB, Gain 38-42dB

Ceramic-Teflon Print

The LNA is designed for no compromise in Noise Figure .. with Suhner N-connectors N connectors are an option but SMA offers slightly better results in NF


Swiss made This device has been developed in Switzerland. Credit for unvaluable information, hints and experience goes to WA6PY, Paul Chominski, and DJ0FW, Helmut Bentivoglio.

So far HB9BBD LNA are in operation in Europe, Russia, Japan, Australia, Alaska and the US. Many EME expeditions used this LNA with success, among them all phantastic Expeditions by Michael DL1YMK and Monika.


EME expeditions with HB9BBD LNA


DL1YMK/CX 2008 Uruguay
TF/DL1YMK Soundfile, Pictures, Log
C31TLTC31TLT LNA HB9BBD (1)
C31TLT LNA HB9BBD (2)

For your order or inquiry please click here: mail.




The silver plated body with ceramic printed board


The silver plated body with ceramic printed board


The silver plated body with ceramic printed board


proper mount to your feedhorn



Schematic of a cirquit which I presented at the EME conference 2000 in Rio de Janeiro. The system has been realized in my EME station since 1997 and allows permanent control of the whole rf-path up to the dish and down to the converter. Nesting birds in the feedhorn, water in the cables, connector faults etc. can be detected while transmitting. Furthermore, the rf power in the feedhorn, isolation and return loss are under permanent control. I strongly recommend to go for it.
Credit for the drawing goes to ON7UN, thanks!


The schematic allows to permanently monitor the rf path of tx and rx while transmitting

Here comes ON7UN's way of using the HB9BBD LNA.

The Manual (3 pdf pages)

page1
Page 1

page2
Page 2

page3
Page 3






23cm / 23cm vorverstärker / 2-stufiger vorverstärker / 1296 MHz vorverstärker / eme vorverstärker /
23cm preamp / 1296mHz preamp / LNA 1296 / preamplifier / 23cm / 1296 / 1296 mc / 1296 MHz / low noise / small signal amplifier / cavity lna / cavity preamplifier /

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