Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

LF: TX bandpass

To: [email protected]
Subject: LF: TX bandpass
From: Stefan Schäfer <[email protected]>
Date: Fri, 02 Dec 2011 19:15:16 +0100
Reply-to: [email protected]
Sender: [email protected]
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3

LF,

Just for fun and entertainment i want to share my todays work and show a picture of the bandpass i have now arranged in my LF PA. 60x0.1mm RF litz wire is used on some T200-2 cores, the caps are Wima FKP-1 2 kV types. There is also a blue large ferrite core visible that makes the decoupling from the mains voltage and impedance matching. It has a 1 uF cap in series for DC decoupling, to be replaced later by a resonant LC circuit. Coming from the antenna cable which is RG214 type there is a parallel LC to ground, then a series LC in series to the xfmr. From the series and parallel coils i will soon decouple some RF to drive a phase meter showing if i am on resonance. In the next step, the drive engine which is on the roof now will be steered with a circuit connected to the phase meter. It will keep the system in resonance in case of sudden rainfall, which changes my resonance strongly, due to the high Q of the new glass/RF-litz coil which must be in the range of 1000!

http://dl.dropbox.com/u/19882028/LF/DSC04272.JPG

Nice hobby for cold and dark days :-)

73, Stefan/DK7FC


<Prev in Thread] Current Thread [Next in Thread>
  • LF: TX bandpass, Stefan Schäfer <=