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Message-ID: <530A3920.9020308@iup.uni-heidelberg.de>
Date: Sun, 23 Feb 2014 19:08:32 +0100
From: schaefer <schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
Subject: LF: WSPR MF QRPPPPP by DK7FC ??
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Hello all,

You all know me as a QRP station :-) But today i want to run even less 
power!

While running in the sunny afternoon i got the idea to build a very 
small and weak PA. After some playing arround it came to me that it will 
be a class-E PA. The power supply should be a lemon battery, i.e. a 
homemade galvanic element, maybe 2 in series!

The desired RF power is arround 20...40 mW, at 2 V DC. And i'm using a 
BS170 
<https://dl.dropboxusercontent.com/u/19882028/Datenbl%C3%A4tter/BS170.pdf> 
MOSFET for that PA. The biggest part will be the BNC jack :-)

So far i'm testing with an empty 9V battery and a 100 Ohm resistor in 
series. I measured 2V and 35mA. But the PA is not yet aligned for class 
E mode. Probably the efficiency is less than 50% in the moment.

Anyway several stations seem to copy me :-)

More reporting stations are apprechiated, if you like to test your 
sensitive RX :-)

73, Stefan/DK7FC

PS: Later, i want to try to rectify some RF coming from AFN to my 
antenna. It this is fed to a 10F gold cap and WSPR-2 in 33% ratio is 
sent, maybe i can run that PA from the energy of AFN :-)


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<head>

<meta http-equiv="content-type" content="text/html; charset=ISO-8859-15">
</head>
<body bgcolor="#ffffff" text="#000000">
Hello all, <br>
<br>
You all know me as a QRP station :-) But today i want to run even less
power!<br>
<br>
While running in the sunny afternoon i got the idea to build a very
small and weak PA. After some playing arround it came to me that it
will be a class-E PA. The power supply should be a lemon battery, i.e.
a homemade galvanic element, maybe 2 in series!<br>
<br>
The desired RF power is arround 20...40 mW, at 2 V DC. And i'm using a <a
 href="https://dl.dropboxusercontent.com/u/19882028/Datenbl%C3%A4tter/BS170.pdf">BS170</a>
MOSFET for that PA. The biggest part will be the BNC jack :-)<br>
<br>
So far i'm testing with an empty 9V battery and a 100 Ohm resistor in
series. I measured 2V and 35mA. But the PA is not yet aligned for class
E mode. Probably the efficiency is less than 50% in the moment. <br>
<br>
Anyway several stations seem to copy me :-)<br>
<br>
More reporting stations are apprechiated, if you like to test your
sensitive RX :-)<br>
<br>
73, Stefan/DK7FC<br>
<br>
PS: Later, i want to try to rectify some RF coming from AFN to my
antenna. It this is fed to a 10F gold cap and WSPR-2 in 33% ratio is
sent, maybe i can run that PA from the energy of AFN :-)<br>
<br>
</body>
</html>

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