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LF: Lf Frontend

To: [email protected]
Subject: LF: Lf Frontend
From: Stefan Schäfer <[email protected]>
Date: Wed, 11 May 2011 16:42:46 +0200
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Hello group,

Here a picture of my new LF frontend of my active antenna, http://dl.dropbox.com/u/19882028/LF/LF%20frontend.jpg It has a 2 stage bandpass filter in front of the first FET stage (BF862 which is located on the back side). The Q is not very high but DLF and DCF49 are attenuated by about 15 dB. Additionally it provides a kind of HV protection, i hope ;-) But the main purpose is to filter VLF and MF and HF. On the older version i regularly saw MSK traces arround 136.6 kHz. This is 153 kHz (DLF) minus 16.4 kHz (JXN)! :-) After some test time it moves in a water proof PVC tube now and is intended to run 24/7 on the grabber as the omnidirectional antenna. Further improvements will be done in the shack, perhaps.

73, Stefan/DK7FC


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