Message-ID: <71A8DF2CFC0B4036B2664789F2AC98E0@PCCasa>
From: "Daniele Tincani" <daniele.tincani@alice.it>
To: <rsgb_lf_group@blacksheep.org>
Date: Sun, 28 Mar 2010 20:08:20 +0200
MIME-Version: 1.0
Subject: LF: Balun for tuned loop antenna
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Hi all,
I'm new to the LF and just starting to play with an homebrew tuned mag=
loop and my small portable (Tecsun PL-600).
I managed to enable (by means of the soldering iron :-)) the external=
 antenna jack also for MF and LF on PL-600 (normally it only works in=
 HF). Now I can connect the pick-up turn of my magloop directly to the=
 radio but I know it would be better to try to keep it balanced by mea=
ns of a balun. Here my problem: magloop simulation (with rjeloop3.exe)=
 tells the antenna has an impedance of between 500 and 2500 ohms (on=
 the frequencies it covers, from 280KHz up to 1000KHz). On the other=
 hand, I don't think the receiver have a 50ohm input. In fact, it is=
 designed typically for HF random wires and has a JFET input buffer st=
age that should ensure an high impedance. Given these conditions, does=
 it still make sense to build a balun? If yes, how could it be designe=
d in terms of number of turns (primary side and secondary side), etc.?
Many thanks for any feedback.
Reg's
Daniele

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<DIV><FONT size=3D2 face=3DArial>Hi all,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>I'm new to the LF and just starting=
 to play with an=20
homebrew tuned magloop and my small portable (Tecsun PL-600).</FONT></=
DIV>
<DIV><FONT size=3D2 face=3DArial>I managed to enable (by means of the=
 soldering iron=20
:-)) the external antenna jack also for MF and LF on PL-600 (normally=
 it only=20
works in HF). Now I can connect the pick-up turn of my magloop directl=
y to the=20
radio but I know it would be better to try to keep it balanced by mean=
s of a=20
balun. Here my problem:&nbsp;magloop simulation (with rjeloop3.exe)=20
tells&nbsp;the antenna&nbsp;has an impedance of between 500 and 2500=
 ohms (on=20
the frequencies it covers, from 280KHz up to 1000KHz). On the other ha=
nd, I=20
don't think the receiver have a 50ohm input. In fact, it is designed=
 typically=20
for HF random wires and has a JFET input buffer stage that should ensu=
re an high=20
impedance. Given these conditions, does it still make sense to build=
 a balun? If=20
yes, how could it be designed in terms of number of turns (primary sid=
e and=20
secondary side), etc.?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Many thanks for any feedback.</FONT><=
/DIV>
<DIV><FONT size=3D2 face=3DArial>Reg's</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Daniele</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV></BODY></HTML>

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