Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id wAIHK8ph011572 for ; Sun, 18 Nov 2018 18:20:09 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gOQcc-0002fI-VU for rs_out_1@blacksheep.org; Sun, 18 Nov 2018 17:12:34 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gOQca-0002f9-V9 for rsgb_lf_group@blacksheep.org; Sun, 18 Nov 2018 17:12:32 +0000 Received: from mail-ed1-x52f.google.com ([2a00:1450:4864:20::52f]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1gOQcY-0001Bn-AN for rsgb_lf_group@blacksheep.org; Sun, 18 Nov 2018 17:12:31 +0000 Received: by mail-ed1-x52f.google.com with SMTP id z28so333613edi.8 for ; Sun, 18 Nov 2018 09:12:30 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=P934Tu7L68llgzQIWQ4zelCel9m19Gx/9hK3h2C6nQk=; b=eCUxoij6kmAIi0edrWsQ7Ccn1o760VKIanoiyjEvJlFqDfRQ0RSynMpojMHwp1IlHU AeCVGGdBMgNYb7oyCSvnsWX/6kpZ2q4q84p4DHZqE7tvN6NV3eeZuA/acW+eswkN/tSt GSKw4z8qBU2GMi+GOqwbKuZLz86xXZswAM94T5HyfPuRzKx7Wa7gUSEJYY7cL01oojGZ HNB6cankz9eUUpjTTOMaWi61D6i3jnMSppTe2YUGdlM1q4lg1ONaNGwolJs8VDe6XOu0 5TwiE0+A4AVpTCUuZxVuzdpJSwVsvCZ1p8hNqYbjvcgr6SUyXMcYzTMD7cnYcVNKUyje dMww== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=P934Tu7L68llgzQIWQ4zelCel9m19Gx/9hK3h2C6nQk=; b=QzKxdAdcssbj4hBIWryvqDHxliZtoTMaUJgc3fhw9LXiHEa8SITiwohJcwyBgg2GLt pDKos3TeAK/2KFWdvGJ1IiQeARw/6hJXL3osCgHZX66CsmBJMwpQCyC7eClx5wmw95tg kjIurlAkXbP3shVZzcEOc8I9bPv2ULMk3Afp81wY2kxc7OAopAOvIWoclKXvFY1VGUik QDae6LFL/XqiG42OvuEQicvgGQEtUFWQ2HqWQgehE7GjV6GdSSDkR6hld7ltmoy/fNHI GKvYtgMmza7UOVItfdJReyAStD5q9rYqHbf4kT29BThvRR7g9yB6m3DhSZcWXpXQrDN1 OE5w== X-Gm-Message-State: AGRZ1gKg9RbJ2oGjA8Bs0x42a/rzykjZJNhnp+udZx5hq5p4IgGLLXvE RaqEJuMHnFP9+h4qVcMEYUtihdEBwcbZYpZkoZdjfw== X-Google-Smtp-Source: AJdET5dz1rc7JD/mWtls4rr44tsLjnQL12LxktVl9StXYbv5MWAiNRq4mkKe9oxIvsiK0/g67BWg7n66lRJZ776HsXA= X-Received: by 2002:a50:9784:: with SMTP id e4mr17097259edb.165.1542561149299; Sun, 18 Nov 2018 09:12:29 -0800 (PST) MIME-Version: 1.0 From: Andy Talbot Date: Sun, 18 Nov 2018 17:12:17 +0000 Message-ID: To: "rsgb_lf_group@blacksheep.org" , rsgb_lf_group X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Does anyone use the Elad FDM-DUO on LF with external power amplifier and separate Tx / Rx antennas? This transceiver is perfect for the LF / MF bands in having a separate low power Tx output port supplying a very clean 0dBm which could drive a high power amplifier for linear mode operation. Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:52f listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (andy.g4jnt[at]gmail.com) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid 0.0 T_REMOTE_IMAGE Message contains an external image X-Scan-Signature: 11963a33d604c33786d8f1de94ce267f Subject: LF: Elad FDM-DUO on LF Content-Type: multipart/alternative; boundary="000000000000592fc9057af3812b" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE 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 --000000000000592fc9057af3812b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Does anyone use the Elad FDM-DUO on LF with external power amplifier and separate Tx / Rx antennas? This transceiver is perfect for the LF / MF bands in having a separate low power Tx output port supplying a very clean 0dBm which could drive a high power amplifier for linear mode operation. But I have one big issue with this, and don't yet knw if I need tgo incorporate separate protection circuitry. WHen the low power port is used on transmit, there is no information available as to what the radio does with its receive antenna port. For all we know, it could remain connected to sensitive circuitry. It would be vary careless if the designers had allowed this to occur, but no details are available and asking on the Elad Group gave no replies. My active E-probe antenna sits under the Tx antenna and when radiating 700 Watts is quite happy and survives this, sending back a very distorted +27dBm of signal back up the Rx port in retaliation. The SDR-IQ I used to use could survive this (I found out by accidental trial-and-error it could survive) But at =C2=A3900, I'm not going to use trial-and-error to see how this transceiver copes. Technical support for this radio is very poor. Andy www.g4jnt.com Virus-free. www.avg.com <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> --000000000000592fc9057af3812b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Does anyone use the Elad FDM-DUO on LF with exte= rnal power amplifier and separate Tx / Rx antennas?

This transceiver is perfect for the LF / MF bands in having a s= eparate low power Tx output port supplying a very clean=C2=A0 0dBm which co= uld drive a high power amplifier for linear mode operation.
=
But I have one big issue with this, and don't yet k= nw if I need tgo incorporate separate protection circuitry.
=
WHen the low power port is used on transmit, there is n= o information available as to what the radio does with its receive antenna = port.=C2=A0 For all we know, it could remain connected to sensitive circuit= ry.=C2=A0 It would be vary careless if the designers had allowed this to oc= cur, but no details are available and asking on the Elad Group gave no repl= ies.=C2=A0 =C2=A0

My active E-probe ante= nna sits under the Tx antenna and when radiating 700 Watts is quite happy a= nd survives this, sending back a very distorted=C2=A0+27dBm of signal back = up the Rx port in retaliation.=C2=A0 The SDR-IQ I used to use could survive= this (I found out by accidental trial-and-error it could survive)=C2=A0

But at =C2=A3900,=C2=A0 I'm not going = to use trial-and-error to see how this transceiver copes.=C2=A0

Technical support for this radio is very poor.

Andy
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<= /div>

= Virus-free. www.avg.com
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