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Re: VLF: 8.27

To: [email protected]
Subject: Re: VLF: 8.27
From: Roland Bruestle <[email protected]>
Date: Fri, 13 May 2016 18:48:53 +0200
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Hello Stefan,
ok, it should be 8270kHz.
I have now decreased the turns on the primary winding.
The antenna current is now 350mA, input power to the PA is 150W.
Cooler temperature remains still 37°C.
The transmission is finished since 15:00 UTC. I hope you can give me some report.
Are you using a Mini Whip for receiving? I will try to receive you on you next transmissions.
73,
 Roland

Am 13.05.2016 um 18:21 schrieb DK7FC:
Hello Roland,

8170kHz?
I have the EW loop connected on the tree. Don't hesitate to run a carrier during the morning hours, 4...10 UTC is a good time as you can see. With some luck i will see you in the 424 uHz window. That would be remarkable.

73, GL, Stefan

Am 13.05.2016 09:36, schrieb Roland Bruestle:
Hello Markus, Stefan, Paul,
I'm back at 8170kHz and using now a class D Amplifier. You can see me at Markus Grabber.
Amplifier :
max. power on 2 Ohm: 500W
mac. power on 4 Ohm: 250W
Power supply range. 20..48V
Switching frequency: 400kHz
IC: Texas DTA8950
IC is fan cooled
Price,  mono mode: Ebay, 50 €

My actual values:
Power supply: 30V, 3A = 90W
PA output about 80W
Antenna current: 250mA
Temperature of cooler: 37°C
Fan mostly switched off

For more power I have to increase the voltage of power supply or to lower the primary turns of the transformer.
300Ws should be not a problem.

For receiving I wont to use a min whip. I hope that the noise is not to high.

73
Roland DL3NDR


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