Return-Path: Received: from rly-da02.mx.aol.com (rly-da02.mail.aol.com [172.19.129.76]) by air-da01.mail.aol.com (v123.4) with ESMTP id MAILINDA013-a5649ca3a3a2e; Wed, 25 Mar 2009 10:06:21 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-da02.mx.aol.com (v123.4) with ESMTP id MAILRELAYINDA026-a5649ca3a3a2e; Wed, 25 Mar 2009 10:05:48 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LmTjD-0008ES-ID for rs_out_1@blacksheep.org; Wed, 25 Mar 2009 14:05:11 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LmTjD-0008EJ-3o for rsgb_lf_group@blacksheep.org; Wed, 25 Mar 2009 14:05:11 +0000 Received: from mailout06.t-online.de ([194.25.134.19]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LmTjB-0006nN-6V for rsgb_lf_group@blacksheep.org; Wed, 25 Mar 2009 14:05:11 +0000 Received: from fwd06.aul.t-online.de by mailout06.sul.t-online.de with smtp id 1LmTj6-0006KL-05; Wed, 25 Mar 2009 15:05:04 +0100 Received: from [192.168.2.22] (SmG1STZG8hS2MMJAxNZD4k6KdDJbts2AmIcJPxpXIJV9AQff2UKK1Zv0yoWLZ89QqZ@[93.196.61.110]) by fwd06.t-online.de with esmtp id 1LmTgt-2JSr0S0; Wed, 25 Mar 2009 15:02:47 +0100 MIME-Version: 1.0 From: hajo.brandt.dj1zb@t-online.de References: In-Reply-To: To: X-Mailer: T-Online eMail 6.07.0001 Date: 25 Mar 2009 14:02 GMT Message-ID: <1LmTgt-2JSr0S0@fwd06.t-online.de> X-ID: SmG1STZG8hS2MMJAxNZD4k6KdDJbts2AmIcJPxpXIJV9AQff2UKK1Zv0yoWLZ89QqZ X-TOI-MSGID: 3ddeee6c-74d6-4194-bae5-391fb69e66e8 X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: TDA2003, TDA2030 for PA? Content-Type: Multipart/Alternative; Boundary="__Next_1237989744_Part49__" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.3 required=5.0 tests=HTML_30_40,HTML_MESSAGE, NO_EXPERIENCE,NO_REAL_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 --__Next_1237989744_Part49__ Content-Type: Text/Plain; Charset="ISO-8859-1" Content-Transfer-Encoding: 8Bit Dear Petr, I have just built an LF amplifier using a TBA810S to drive my antenna metering bridge. Output has been 3,5 watts at 136 kHz and 15 volts supply voltage. 500 kHz was not on the table at that time, therefore no experiences on that band. In general one has to experiment with the capacitors setting the upper frequency response to make them as low in capacity as feasible. I have also bought some other AF ICs to follow these ideas but have never taken the time to try them, sri. OK? 73 Ha-Jo, DJ1ZB "Petr Malư" schrieb: Hi all, My intention is to build a small transmitter up to some 10W for 136 and 505 kHz, this time not the D class, but B or AB class. I think of employing AF amplifiers such as TDA2003, TDA2030, or similar. Of course, mainly 505 kHz is rather out of range so that nothing is guaranteed. This is why I ask before experimenting. Did anybody try to use these for 136/505 kHz? Tks, 73, Petr, OK!FIG http://ok1fig.nagano.cz --__Next_1237989744_Part49__ Content-Type: Text/HTML; Charset="ISO-8859-1" Content-Transfer-Encoding: 8Bit T-Online eMail Dear Petr,

I have just built an LF amplifier using a TBA810S to drive my antenna metering bridge. Output has been 3,5 watts at 136 kHz and 15 volts supply voltage. 500 kHz was not on the table at that time, therefore no experiences on that band.

In general one has to experiment with the capacitors setting the upper frequency response to make them as low in capacity as feasible.

I have also bought some other AF ICs to follow these ideas but have never taken the time to try them, sri.

OK?

73 Ha-Jo, DJ1ZB


  "Petr Malư" <p.maly@gmc.net> schrieb:
Hi all,
 
My intention is to build a small transmitter up to some 10W for 136 and 505 kHz, this time not the D class, but B or AB class.
I think of employing AF amplifiers such as TDA2003, TDA2030, or similar. Of course, mainly 505 kHz is rather out of range so that nothing is guaranteed. This is why I ask before experimenting.
Did anybody try to use these for 136/505 kHz?
 
Tks, 73, Petr, OK!FIG
 
 
  --__Next_1237989744_Part49__--