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136 kHz Projects - Pre-Amplifiers

136kHz L.F. Pre-amplifier by GØMRF
This circuit is based on a design by Dave Pick G3YXM and was jointly redesigned in 2003 after the original coils and polystyrene capacitors were made obsolete.
http://www.g0mrf.com/preamp.htm
 

137 kHz antenna preamplifier by EA4EOZ
One of the principal problems an amateur operator finds when tries to receive in the 137 kHz band is the really poor performance on typical amateur transceivers.
http://ea4eoz.blogspot.com/2012/09/137-khz-antenna-preamplifier.html

Loop Pre-amp for LF by G3YXM
If you want to use a a small multi-turn loop on LF, you will find that the sensitivity is not good enough to receive the weaker signals. A good preamp for a loop needs to have a high input impedance and good signal handling characteristics (to prevent cross-modulation).
http://www.wireless.org.uk/circuits2.htm#loopamp

Pre-amp/filter for 136kHz by G3YXM
Most modern tranceivers cover LF but the performance is not always very good. All you can hear are strange whistles and burbles which aren't really there! You need this little circuit. It has a gain of about 10dB and a nice sharp band-pass response about 3kHz wide, enough to cover the 136 band.
http://www.wireless.org.uk/circuits2.htm#preamp


Creation date : 29/08/2018 @ 01:12
Last update : 23/09/2018 @ 18:17
Category : 136 kHz Projects
Page read 328 times


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