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A 21-30 MHz low noise amplifier
Design of a preamplifier for the "deaf" HF receiver. When you need extra sensitivity for 15, 12 and 10 meter operation - for example for amateur satellite
post 29 Feb 2024
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2 Meter GaAs FET Preamp
This circuit will work on 2 meters, 220 or 440 MHz. Some part values are different for the 3 bands, however general layout and construction are similar
2 meter antenna preamp
With a dualgate galiumarsenid fet CF300 with switchable amplifikation 14 and 24 dBD.Noisfaktor better then 0,9dB feedtrough attenuation better than 0,2 dB Maximum powerrating 750 W PEP on 2 meters with these relais
50 MHz preamp Gain 26dB with the BFG135
As I had good experience with building preamps for 144 and 430 MHz, I wanted to try a simple design for 50 MHz. The BFG135a is a cheap transistor and in my view rather strong
23 cm GaAs FET preamplifier
On 23cm the best way to obtain a good RX-sensitivity is to use a GaAs-FET in the front-end, since these devices show very low noise figures
28-30 MHz Homebrew Antenna pre-amplifier
I designed a simple circuit having in mind my junkbox! So there is nothing unusual on this pre amp, all components are possibly available into Homenrewer's Shack
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This circuit will work on 2 meters, 220 or 440 MHz. Some part values are different for the 3 bands, however general layout and construction are similar
With a dualgate galiumarsenid fet CF300 with switchable amplifikation 14 and 24 dBD.Noisfaktor better then 0,9dB feedtrough attenuation better than 0,2 dB Maximum powerrating 750 W PEP on 2 meters with these relais
As I had good experience with building preamps for 144 and 430 MHz, I wanted to try a simple design for 50 MHz. The BFG135a is a cheap transistor and in my view rather strong
On 23cm the best way to obtain a good RX-sensitivity is to use a GaAs-FET in the front-end, since these devices show very low noise figures
I designed a simple circuit having in mind my junkbox! So there is nothing unusual on this pre amp, all components are possibly available into Homenrewer's Shack
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