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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 19:35:05 +0100
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Hello Andy,

Well, the lowest range for the antenna current is 5A and the needle of the analog meter does not move at all. It must be less than 50 mA.
The power drops more and more now since the battery is empty. Still 1.85 V and F5WK detects me! :-)

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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