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Re: LF: WSPR MF QRPPPPP by DK7FC ??

To: [email protected]
Subject: Re: LF: WSPR MF QRPPPPP by DK7FC ??
From: schaefer <[email protected]>
Date: Sun, 23 Feb 2014 19:50:19 +0100
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Hello Andy, MF,

Here is an image of what i have so far: https://dl.dropboxusercontent.com/u/19882028/MF/20140223_193945.jpg
I'm just playing arround, without having a schematic or calculations. But now i'm starting to add some elements to improve the efficiency.

Maybe tomorrow i will transmit with a LEMON. Maybe some JT9 or WSQ QSO can be made with that ;-)

73, Stefan



Am 23.02.2014 19:25, schrieb André Guyé:
Ok Stefan,
 
here hard to copy you because your TX frequency is not clear at this moment.
 
Please, what is the current intensity at the base of the antenna ?
 
Andy.
 
From: schaefer
Sent: Sunday, February 23, 2014 7:08 PM
Subject: LF: WSPR MF QRPPPPP by DK7FC ??
 
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 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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