Return-Path: Received: from mtain-ma04.r1000.mx.aol.com (mtain-ma04.r1000.mx.aol.com [172.29.96.12]) by air-da03.mail.aol.com (v126.13) with ESMTP id MAILINDA033-863b4b3652df41; Sat, 26 Dec 2009 13:15:59 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7D9B238000133; Sat, 26 Dec 2009 13:15:58 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NObAO-0006MM-8A for rs_out_1@blacksheep.org; Sat, 26 Dec 2009 18:15:04 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NObAN-0006MD-HU for rsgb_lf_group@blacksheep.org; Sat, 26 Dec 2009 18:15:03 +0000 Received: from lnx500.hrz.tu-darmstadt.de ([130.83.156.225]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NObAL-0007k9-8U for rsgb_lf_group@blacksheep.org; Sat, 26 Dec 2009 18:15:03 +0000 Received: from FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de (File-Server-HST.hst.e-technik.tu-darmstadt.de [130.83.212.129]) by lnx500.hrz.tu-darmstadt.de (8.14.2/8.14.2/HRZ/PMX) with SMTP id nBQ9hISf015082 for ; Sat, 26 Dec 2009 10:43:18 +0100 (envelope-from schaefer@hst.tu-darmstadt.de) Received: from [127.0.0.1] (helo=File-Server-HST.hst.e-technik.tu-darmstadt.de) by FILE-SERVER-HST.hst.e-technik.tu-darmstadt.de with AVK MailGateway; for ; Sat, 26 Dec 2009 19:15:00 +0100 Content-class: urn:content-classes:message MIME-Version: 1.0 X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Sat, 26 Dec 2009 19:15:03 +0100 Message-ID: <38A51B74B884D74083D7950AD0DD85E828AD02@File-Server-HST.hst.e-technik.tu-darmstadt.de> In-Reply-To: <38A51B74B884D74083D7950AD0DD85E828AD01@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: LF: Influence of a TX antenna to a small rx antenna Thread-Index: AcqGGFYF9XxzmBnkSPGa7Jdvc9EERwAMDxCQAABsNKAAAW5EIA== From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= To: X-AVK-Virus-Check: AVB 19.647;26.12.2009 X-PMX-TU: seen v0.99a by 5.5.8.383112, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2009.12.26.180317 X-PMX-SPAMCHECK: outgoing mail X-Karma: unknown: X-Spam-Score: 0.8 (/) X-Spam-Report: autolearn=disabled,EXTRA_MPART_TYPE=0.815,HTML_MESSAGE=0.001 Content-Type: multipart/related; type="multipart/alternative"; boundary="----_=_NextPart_001_01CA8657.562F9C0D" Subject: LF: Influence of a TX antenna to a small rx antenna X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40, HTML_FONTCOLOR_UNKNOWN,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 x-aol-global-disposition: G X-AOL-VSS-INFO: 5.3.00/59368 X-AOL-VSS-CODE: Scan Clean x-aol-sid: 3039ac1d600c4b3652de2c7c X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) X-AOL-VSS-INFO: 5.3.00/0 ------_=_NextPart_001_01CA8657.562F9C0D Content-Type: multipart/alternative; boundary="----_=_NextPart_002_01CA8657.562F9C0D" ------_=_NextPart_002_01CA8657.562F9C0D Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear Lowfers,=20 Yesterday i saw the extreme influence of my 100m vertical tx antenna to th= e small active antenna. Now I have some ideas how to avoid that and would= be thankful for any comments and hints. During the QSOs there was much QSB in the RX signals, just as if someone= is playing with the AF-volume. First I thought it is caused by a loose co= ntact in the Converter or in the fiber optic cable but later I found, that= it was caused by the angle of the tx antenna to ground (Wind was good but= with some QSB ;-) ). In my last QSO with IK1HSS I disconnected the TX wire from the loading coi= l and than, the whole signal was almost gone (when choosing "visual mode= LOW" at the argo monitor). Switching to "visual mode HIGH" and increasing= the AF a little bit gave almost the same QRM lines by DFC39 (vy strong ye= sterday). Now, the SNR was much better than before!=20 In the following pic you can get a impression of the dimension of the infl= uence of the TX ant (The RX ant is isolated to the rest of the rig by an= optic fiber cable and battery supply, so "just" coupled by the E field to= the TX ant): In the left part the TX wire was disconnected from the coil and mode was= HIGH In the middle part I connected the wire to the loading coil In the right part I switched to the LOW mode! I am sure that the TX ant does not only increase the QRM but also the want= ed signal. So the benefit will not be so strong than between left and righ= t part in the pic. But the SNR increases significantly, as I saw in the QS= O with IK1HSS. So a disconnection of the TX wire makes sense. What are the alternatives?=20 Placing the RX ant apart from the TX ant to reduce the influence? I think= with a 100m vertical I can forget that unless I do not want to spend 100s= of meters of RX cable ;-) Bringing the ant out of resonance? That is the one and only solution I thi= nk. Any better ideas?=20 I could disconnect the loading coil at the lower end to ground. That could= be done with a relay (My RX/TX sequencer provides an output "12V @ RX" th= at could directly be used for this). Probably there will be a residual cou= pling capacity of the coil to ground and the relay contacts and so on, say= 30pF but since my ant C is 580pF that would be quite enough for deadjusti= ng, I hope so. As I thought about protecting the contacts and the PA in the case that the= re will be a mistake (contacts have to be closed without a voltage at the= relay) in the circuit, i thought some Varistors or even better some antip= arallel diodes could be a good choice. That brought me to the idea that a= power diode out of a SMPS would easyly handle the antenna current with fa= st enough switching times. So do you think just two antiparallel diodes (or perhaps 2x2, 2 in series,= and perhaps with an additional 10...100k Resistor parallel) without a rel= ay could be suitable to solve the RX TX ant influence problem? Could the= TX signal distortion be neglected? When the voltage across the diodes (RX= case) is less than the forward voltage, do the diodes act as an open cont= act, just with a few pF reverse capacity? I think so but I don't know much= about the RX voltages that are given by such an antenna. There will be so= me experiments... :-) Comments welcome ;-) 73, Stefan/DK7FC ------_=_NextPart_002_01CA8657.562F9C0D Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Dear Lowfers,

= Yesterday i saw the extreme influence of my 100m vertical tx antenna to the small acti= ve antenna. Now I have some ideas how to avoid that and would be thankful for= any comments and hints.

= During the QSOs there was much QSB in the RX signals, just as if someone is playing with= the AF-volume. First I thought it is caused by a loose contact in the Converte= r or in the fiber optic cable but later I found, that it was caused by the angl= e of the tx antenna to ground (Wind was good but with some QSB ;-) ).

= In my last QSO with IK1HSS I disconnected the TX wire from the loading coil and than, the whole signal was almost gone (when choosing “visual mode LOW”= at the argo monitor). Switching to “visual mode HIGH” and increas= ing the AF a little bit gave almost the same QRM lines by DFC39 (vy strong yesterday). Now, the SNR was much better than before!

= In the following pic you can get a impression of the dimension of the influence= of the TX ant (The RX ant is isolated to the rest of the rig by an optic fiber ca= ble and battery supply, so “just” coupled by the E field to the TX= ant):

=

= In the left part the TX wire was disconnected from the coil and mode was HIGH

= In the middle part I connected the wire to the loading coil

= In the right part I switched to the LOW mode!

= I am sure that the TX ant does not only increase the QRM but also the wanted signal. So= the benefit will not be so strong than between left and right part in the pic.= But the SNR increases significantly, as I saw in the QSO with IK1HSS. So a disconnection of the TX wire makes sense.

= What are the alternatives?

= Placing the RX ant apart from the TX ant to reduce the influence? I think with a 100m ver= tical I can forget that unless I do not want to spend 100s of meters of RX cable= ;-)

= Bringing the ant out of resonance? That is the one and only solution I think. Any bette= r ideas?

= I could disconnect the loading coil at the lower end to ground. That could be done= with a relay (My RX/TX sequencer provides an output “12V @ RX” that could directly be used for this). Probably there will be a residual coupli= ng capacity of the coil to ground and the relay contacts and so on, say 30pF= but since my ant C is 580pF that would be quite enough for deadjusting, I hope= so.

= As I thought about protecting the contacts and the PA in the case that there will be a mistake (contacts have to be closed without a voltage at the relay) in the circuit, i thought some Varistors or even better some antiparallel diodes= could be a good choice. That brought me to the idea that a power diode out of a= SMPS would easyly handle the antenna current with fast enough switching times.<= /span>

= So do you think just two antiparallel diodes (or perhaps 2x2, 2 in series, and perhaps wit= h an additional 10…100k Resistor parallel) without a relay could be suita= ble to solve the RX TX ant influence problem? Could the TX signal distortion= be neglected? When the voltage across the diodes (RX case) is less than the forward volt= age, do the diodes act as an open contact, just with a few pF reverse capacity?= I think so but I don’t know much about the RX voltages that are given= by such an antenna. There will be some experiments… J

= Comments welcome ;-)

= 73, Stefan/DK7FC

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