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[86.14.226.229]) by mx.google.com with ESMTPS id fg6sm15660050wib.3.2012.11.06.10.27.44 (version=SSLv3 cipher=OTHER); Tue, 06 Nov 2012 10:27:44 -0800 (PST) References: <002901cdbc3e$193684d0$0501a8c0@xphd97xgq27nyf> From: Roger Lapthorn X-Mailer: iPod Mail (10A403) In-Reply-To: <002901cdbc3e$193684d0$0501a8c0@xphd97xgq27nyf> Message-Id: <2F2ACDA5-3E98-4815-8A4E-BA8EAF9F4585@gmail.com> Date: Tue, 6 Nov 2012 18:27:42 +0000 To: "rsgb_lf_group@blacksheep.org" Mime-Version: 1.0 (1.0) X-Spam-Score: -0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: For 500kHz use an FT817 at 500 mW as the transceiver and my transverter design? Neither get hot. A 15W version for 136kHz coming soon too. Works like a dream and simple. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [209.85.212.181 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (rogerlapthorn[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: c9d6a1e47761f7ec7375ac340bef30d0 Subject: Re: LF: TRANSVERTERS Content-Type: multipart/alternative; boundary=Apple-Mail-F1AA93BA-3621-4C44-A807-0F02D32289D9 Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mtain-dc06.r1000.mx.aol.com ; domain : gmail.com DKIM : pass x-aol-sid: 3039ac1d4086509956f12e88 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --Apple-Mail-F1AA93BA-3621-4C44-A807-0F02D32289D9 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable For 500kHz use an FT817 at 500 mW as the transceiver and my transverter desi= gn? Neither get hot.=20 A 15W version for 136kHz coming soon too.=20 Works like a dream and simple.=20 73s Roger G3XBM On 6 Nov 2012, at 16:45, "mal hamilton" wrote: > RIG/TRANSVERTER HEAT > I have noticed when running a Transceiver at low power for Transverter or o= ther use the Transceiver PA gets very HOT so it would appear that this is an= inefficient approach except the Transceiver has a dedicated low power outpu= t. > I was wondering what system was used to reduce this power. It would be bet= ter to disable the PA and take the output from the driver stage. > It is vy noticeable on an IC-706 > =20 > de G3KEV > =20 --Apple-Mail-F1AA93BA-3621-4C44-A807-0F02D32289D9 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit
For 500kHz use an FT817 at 500 mW as the transceiver and my transverter design? Neither get hot. 

A 15W version for 136kHz coming soon too. 

Works like a dream and simple. 

73s
Roger G3XBM

On 6 Nov 2012, at 16:45, "mal hamilton" <g3kevmal@talktalk.net> wrote:

   RIG/TRANSVERTER HEAT
I have noticed when running a Transceiver at low power for Transverter or other use the Transceiver PA gets very HOT so it would appear that this is an inefficient approach except the Transceiver has a dedicated low power output.
I was wondering what system was used to reduce this power. It would be better to disable the PA and take the output from the driver stage.
It is vy noticeable on an IC-706
 
de G3KEV
 
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