Envelope-to: dave@picks.force9.co.uk Delivery-date: Fri, 03 Feb 2006 04:04:01 +0000 Received: by ptb-mxcore01.plus.net with spam-scanned (PlusNet MXCore v2.00) id 1F4sAy-0000Kw-75 for dave@picks.force9.co.uk; Fri, 03 Feb 2006 04:04:00 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (PlusNet MXCore v2.00) id 1F4sAx-0000KR-SC for dave@picks.force9.co.uk; Fri, 03 Feb 2006 04:04:00 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1F4sAk-0001JS-OA for rs_out_1@blacksheep.org; Fri, 03 Feb 2006 04:03:46 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1F4sAk-0001JJ-BF for rsgb_lf_group@blacksheep.org; Fri, 03 Feb 2006 04:03:46 +0000 Received: from vms044pub.verizon.net ([206.46.252.44]) by relay1.thorcom.net with esmtp (Exim 4.51) id 1F4tUw-0000BH-Kk for rsgb_lf_group@blacksheep.org; Fri, 03 Feb 2006 05:28:58 +0000 Received: from [127.0.0.1] ([141.156.184.182]) by vms044.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0IU3006FRF9LIHZ0@vms044.mailsrvcs.net> for rsgb_lf_group@blacksheep.org; Thu, 02 Feb 2006 22:03:24 -0600 (CST) Date: Thu, 02 Feb 2006 23:02:52 -0500 From: Andre Kesteloot In-reply-to: <000901c627ec$a44d91f0$2201a8c0@pcroelof> To: rsgb_lf_group@blacksheep.org Message-id: <43E2D5EC.2090002@verizon.net> MIME-version: 1.0 X-Accept-Language: en-us, en References: <000701c62720$be51b3a0$6401a8c0@JAYTERMINAL> <1246025403.20060201202249@dx.ru> <1941044238.20060201210259@dx.ru> <486075040.20060202130106@dx.ru> <000901c627ec$a44d91f0$2201a8c0@pcroelof> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax;nscd1) Subject: Re: LF: J310 IMD figures Content-type: text/html; charset=windows-1252 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-PN-SpamFiltered: by PlusNet MXCore (v2.00) Content-transfer-encoding: 8bit Roelof Bakker wrote:

Hello all,

Thanks to Andre Kesteloo for forwarding the update on the AMRAD active whip design and pleased to see that the CP666 is still available.

Regarding the advice for substuting the CP666 for a J310 and the quoted second and third order IMD figures, I have measured these and found IP2 = + 65 dBm and IP3 = + 30 dBm. At 12 volt the J310 should be biased for 10 -12 mA, excellent for battery operation. These figures are in the same league as for the CP666 and I am tempted to purchase one and find out if there is any difference in practice.

Best regards,

Roelof Bakker, pa0rdt

Results of such IMD measurements can be dependent on the frequency difference between F1 and F2. In our case we chose 300 Hz, both signals being in the center of the AM Broadcast band

73
André N4ICK