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70cm Projects - Pre-Amplifiers

Click to enlarge2m & 70cm PREAMPS for Satellite work (ON6UG design) by ON7EQ
The PREAMP is of wideband design. Please note that for certain applications, a narrow band design would be more desirable. Be sure that the preamp is not overloaded by nearby FM broadcast or utility VHF-signals etc.
https://www.qsl.net/on7eq/projects/on6ug_preamp.htm

Click to enlarge1 Watt 2.3 GHz RF Amplifier Using a MRF2001 by Mike Micelli
Simplicity and repeatability are featured in this 1-waat S-band amplifier design. The design uses an MRF2001 transistor as a common base, Class C amplifier. The amplifier delivers 1-watt output with 8 dB minimum gain at 24V, and is tunable from 2.25 to 2.35 GHz.
http://www.qsl.net/n9zia/wireless/mrf2001/index.html

Click to enlarge435 + 1296MHz ATF54143 Pre-amplifier by GØMRF
The prototype for this amplifier was originally designed for 70cm and was used on the 2004 '3B9C' Dx-pedition to Rodriguez Island for satellite and EME. It had a noise figure of 0.49dB with an associated gain of 20dB.
http://www.g0mrf.com/432LNA.htm

Click to enlargeA 1296MHz 2* 2*2C39 Power Amplifier by DL4MEA
This is how all is assembled: A table just below the roof with my 23cm transverter and the power amplifier. Below the table you will see a battery of capacitors which should support the much too small transformer.
http://www.qsl.net/dl4mea/23c39/23c39.htm

Click to enlargeUHF (70cm Band) LNA by SV1BSX
A Low Noise Antenna pre-amplifier (LNA) is a simple unit which offers spectacular improvement in the quality of receiving signal, especially when the signal is very weak and it comes from long distance. This is a usual receiving condition in the Satellite reception, EME and UHF DX-ing.
https://www.qsl.net/sv1bsx/uhflna-bsx/uhflna-bsx.html


Creation date : 07/09/2018 @ 23:01
Last update : 30/09/2018 @ 19:32
Category : 70cm Projects
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