From wd5ivd@tapr.org Fri Jul 03 00:31:24 1998 Received: from [207.8.125.50] (greg-jones-pc1.customer.jump.net [207.8.125.50]) by tapr.org (8.7.5/8.7.3/1.9) with ESMTP id AAA10398 for ; Fri, 3 Jul 1998 00:31:23 -0500 (CDT) Message-Id: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Fri, 3 Jul 1998 00:30:45 -0500 To: " Spread Spectrum " From: "Greg Jones, WD5IVD" Subject: New stuff on the SS web page Several new things have been added to the TAPR SS web page: Tim Shepard's thesis "Decentralized Channel Mgmt in Scalable Multihop SS Packet Networks". This is the basis of his talk at the upcoming DCC in Chicago. (http://www.tapr.org/dcc) James A. Vincent, G1PVZ, has been kind enough to allow us to place his article entitled "Voice Link Over Spread Spectrum Radio" on the web page. Steve Bible, N7HPR, scanned and generated all the page. It is a very good read. Also, we have audio from the 1998 TPRS Digital Forum at HamCom, Arlington, Texas and the 1998 TAPR Digital Forum at Dayton Hamvention. Both forums had talks about SS at them and the TAPR radio project. Cheers -- Greg ----- Greg Jones, WD5IVD Austin, Texas wd5ivd@tapr.org http://www.tapr.org/~wd5ivd Real World, The n.: 5. Anywhere outside a university. "Poor fellow, he's left UT Austin and gone into the real world." From mdmiller@eaze.net Mon Jul 06 22:11:33 1998 Received: from mail.eaze.net (qmailr@mail.eaze.net [209.160.106.3]) by tapr.org (8.7.5/8.7.3/1.9) with SMTP id WAA12479 for ; Mon, 6 Jul 1998 22:11:32 -0500 (CDT) From: mdmiller@eaze.net Received: (qmail 19548 invoked from network); 7 Jul 1998 02:08:39 -0000 Received: from unknown (HELO miller.slimpy.eaze.net) (209.160.127.50) by mail.eaze.net with SMTP; 7 Jul 1998 02:08:39 -0000 Message-Id: <3.0.5.32.19980706221121.007feda0@mail.eaze.net> X-Sender: mdmiller@mail.eaze.net X-Mailer: QUALCOMM Windows Eudora Pro Version 3.0.5 (32) Date: Mon, 06 Jul 1998 22:11:21 -0500 To: ss@tapr.org Subject: Re: [SS:1970] 1998 ARRL and TAPR Digital Communications Conference In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Greg, I attended the DCC last year in Baltimore, and what made it interesting for me was the GPS and Spread Spectrum seminars. Looking through the schedule I don't see any of these subjects listed this year (except for APRS GPS). Will there by any seminars on GPS disciplining of oscillators? What type of Spread Spectrum information can I expect? 73 Mark Miller N5RFX At 02:48 PM 5/31/98 -0500, you wrote: >Topics will include APRS, satellite communications, TCP/IP, digital radio, >Spread Spectrum, and many others. Come to the conference and hear these >topics presented by the experts! Don't miss this opportunity to listen and >talk to others in these areas. > >----- >What can you expect during the 1998 ARRL and TAPR Digital Communications >Conference? > >* SIGs (Special Interest Groups) get-togethers on Saturday, following > the banquet > >If you have attended a Digital Communications Conference in the past, >remember how much fun it was discussing the latest developments into the >wee hours! If you have never been to a Digital Communications Conference, >then make your plans now to attend and find out how much fun they can be. Regards Mark Miller From mackel@hotmail.com Tue Jul 07 05:49:20 1998 Received: from hotmail.com (f134.hotmail.com [207.82.251.13]) by tapr.org (8.7.5/8.7.3/1.9) with SMTP id FAA13488 for ; Tue, 7 Jul 1998 05:49:18 -0500 (CDT) Received: (qmail 8530 invoked by uid 0); 7 Jul 1998 10:48:47 -0000 Message-ID: <19980707104847.8529.qmail@hotmail.com> Received: from 195.67.120.238 by www.hotmail.com with HTTP; Tue, 07 Jul 1998 03:48:47 PDT X-Originating-IP: [195.67.120.238] From: "Marcel Bos" To: ss@tapr.org Subject: Smal Digital SS projects? Content-Type: text/plain Date: Tue, 07 Jul 1998 03:48:47 PDT Hi I havn't been so active in this area.. Just looking for a FAQ and WHERE I can find a easy Amature project in SS? ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com From nitin_jain_india@hotmail.com Tue Jul 07 09:14:26 1998 Received: from hotmail.com (f202.hotmail.com [207.82.251.93]) by tapr.org (8.7.5/8.7.3/1.9) with SMTP id JAA01136 for ; Tue, 7 Jul 1998 09:14:24 -0500 (CDT) Received: (qmail 10038 invoked by uid 0); 7 Jul 1998 14:13:53 -0000 Message-ID: <19980707141353.10037.qmail@hotmail.com> Received: from 202.141.1.228 by www.hotmail.com with HTTP; Tue, 07 Jul 1998 07:13:50 PDT X-Originating-IP: [202.141.1.228] From: "Nitin Jain" To: ss@tapr.org Cc: mackel@hotmail.com Subject: Re: [SS:1996] Smal Digital SS projects? Content-Type: text/plain Date: Tue, 07 Jul 1998 07:13:50 PDT Hi Mr. Bos, As such there does not seem to be there any specific FAQ for ss. U can access www.sss-mag.com site which is one stop for all in SS. I have seen some small amature project details there in the area of Frequency hopping. Get back if U have any doubt. Bye nitin jain CRL-BEL, INDIA nitin_jain_india@hotmail.com >Date: Tue, 7 Jul 1998 05:50:18 -0500 (CDT) >Reply-To: ss@tapr.org >From: "Marcel Bos" >To: ss@tapr.org >Subject: [SS:1996] Smal Digital SS projects? > > >Hi I havn't been so active in this area.. Just looking for a >FAQ and WHERE I can find a easy Amature project in SS? > > >______________________________________________________ >Get Your Private, Free Email at http://www.hotmail.com > > ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com From wd5ivd@tapr.org Tue Jul 07 10:35:07 1998 Received: from [207.8.125.50] (greg-jones-pc1.customer.jump.net [207.8.125.50]) by tapr.org (8.7.5/8.7.3/1.9) with ESMTP id KAA05805 for ; Tue, 7 Jul 1998 10:35:05 -0500 (CDT) Message-Id: In-Reply-To: <3.0.5.32.19980706221121.007feda0@mail.eaze.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Tue, 7 Jul 1998 10:33:23 -0500 To: ss@tapr.org From: "Greg Jones, WD5IVD" Subject: Re: [SS:1995] Re: 1998 ARRL and TAPR Digital Communications >Greg, > >I attended the DCC last year in Baltimore, and what made it interesting for >me was the GPS and Spread Spectrum seminars. Looking through the schedule >I don't see any of these subjects listed this year (except for APRS GPS). > >Will there by any seminars on GPS disciplining of oscillators? > >What type of Spread Spectrum information can I expect? Well, every year is different. I think if you enjoyed the SS talks last year on Sunday you will again like the seminar we have put together for Sunday. Both Lyle's and Tim's talks will be very good and Tim's very relevant to generating networks using Spread Spectrum techniques. As to GPS disciplining of oscillators, that will depend if someone submits a paper or not for the main session ? Hopefully, Tom Clark or someone else working in this area will be presenting something -- but we have little control from year to year on what people do present in the paper session. I am sure it will probably come up in some form during the intro sesions on GPS most likey. But as always, if the area you are interested in is not actually being formally presented, you have the chance to meet in person with the people that know it, since they will be there. Just a matter of coming and saying hello to them and asking a question. Hope to see you in Chicago. http://www.tapr.org/dcc Don't forget that the paper deadline is Aug 15th! Cheers - Greg ----- Greg Jones, WD5IVD Austin, Texas wd5ivd@tapr.org http://www.tapr.org/~wd5ivd Real World, The n.: 5. Anywhere outside a university. "Poor fellow, he's left UT Austin and gone into the real world." From dickrb@lsid.hp.com Tue Jul 07 12:03:23 1998 Received: from palrel1.hp.com (palrel1.hp.com [156.153.255.242]) by tapr.org (8.7.5/8.7.3/1.9) with ESMTP id MAA11339 for ; Tue, 7 Jul 1998 12:03:22 -0500 (CDT) Received: from hplssa.lsid.hp.com (hplssa.lsid.hp.com [15.1.217.2]) by palrel1.hp.com (8.8.6/8.8.5tis) with ESMTP id KAA26139 for ; Tue, 7 Jul 1998 10:03:06 -0700 (PDT) Received: from lsid.hp.com (lkseast.lsid.hp.com) by hplssa.lsid.hp.com with ESMTP (1.37.109.16/15.5+IOS 3.22) id AA231960972; Tue, 7 Jul 1998 10:02:52 -0700 Message-Id: <35A254BB.CECDF93C@lsid.hp.com> Date: Tue, 07 Jul 1998 10:02:51 -0700 From: Dick Bingham Reply-To: dickrb@lsid.hp.com Organization: Hewlett - Packard Co (Lake Stevens Division) X-Mailer: Mozilla 4.05 [en] (WinNT; I) Mime-Version: 1.0 To: ss@tapr.org Subject: Costas Loop Design Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Greetings 7 July, 1998 I am interested in experimenting with a Costas Loop in a DSSS system. The block diagram for such a loop appears simple enough but I am interested in and puzzled by the 3rd mixer, whose two inputs are the "I" and "Q" channel data. These inputs are nearly at "dc" and that makes it hard to use a mixer like the standard DBM (SRA-1 etc.). Does anyone have a "favorite design" for the 3rd mixer circuitry that can be shared? I am interested in circuitry that can be implemented by using commonly available TTL and analog parts. My applications/experiments are being done at HF on 80M with the following equipment: -- 10MHz TCXO system clocks -- 50KHz chip-clock -- 25KHz PLL reference to generate 3575KHz carrier frequency -- (2^7 - 1) PRN code -- +7dBm at 1st comb-line My DSSS transmissions have been authorized by the FCC's Seattle area office and have taken place for the past year over a 90 mile path. I am interested in using a Costas-Loop to help establish system synch and information extraction (spotted- owl hoots and other local forest noises as audio/data input to the ADC at TX end). My present system is fairly primitive in that the chip-clock is derived from an ~10MHz oscillator and switched to the local "long-term-stable" 10MHz TCXO once synch is established. This allows me to maintain the link in the presence of co-channel user QRM and long (10's of minutes) QSB fades. I have recently received authorization to continue these tests for another year and plan some FHSS tests which will use an ~5MHz FH PLL I developed that has 127 frequency steps. This L.O. will be mixed with a 9MHz L.O. to allow FHSS experiments on 80M and 20M. All of these L.O.'s are derived from the 10MHz TXCO's to reduce frequency uncertainty issues which is necessary when dealing with weak-signal HF-propagated signals. Any Costas-Loop design schematics will be appreciated and credit given if any of my work is published. 73 de w7wkr Dick Bingham 5719 16th Ave N.E. Seattle, WA 98105 (206) 527-3468 From janovetz@ews.uiuc.edu Tue Jul 07 12:46:44 1998 Received: from eesn18.ews.uiuc.edu (janovetz@eesn18.ews.uiuc.edu [130.126.161.202]) by tapr.org (8.7.5/8.7.3/1.9) with ESMTP id MAA13526 for ; Tue, 7 Jul 1998 12:46:43 -0500 (CDT) Received: (from janovetz@localhost) by eesn18.ews.uiuc.edu (8.8.8/8.7.3) id MAA19146 for ss@tapr.org; Tue, 7 Jul 1998 12:46:41 -0500 (CDT) From: Jacob W Janovetz Message-Id: <199807071746.MAA19146@eesn18.ews.uiuc.edu> Subject: Re: [SS:1999] Costas Loop Design To: ss@tapr.org Date: Tue, 7 Jul 1998 12:46:41 -0500 (CDT) In-Reply-To: <35A254BB.CECDF93C@lsid.hp.com> from "Dick Bingham" at Jul 7, 98 12:09:52 pm X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit > Greetings > 7 July, 1998 Howdy... > I am interested in experimenting with a Costas Loop in a DSSS system. > The block > diagram for such a loop appears simple enough but I am interested in and > puzzled > by the 3rd mixer, whose two inputs are the "I" and "Q" channel data. I'm not sure I know what you mean by 3rd mixer. If it's where I think it is in the loop (just before the VCO), it's an adder (or subtractor). The idea is to try to force the outputs from I and Q to be equal. This pushes the constellation points to the corner of the constellation. The usual four-phase costas loop phase detector consists of two hardlimiters and two mixers and the summer, so the output of the phase detector is: pdout = i*sign(q) - q*sign(i) or pdout = q*sign(i) - i*sign(q) depending on the sign of the slope of the VCO you're designing for. If I misunderstood, I apologize. > These inputs > are nearly at "dc" and that makes it hard to use a mixer like the > standard DBM > (SRA-1 etc.). Does anyone have a "favorite design" for the 3rd mixer > circuitry that > can be shared? > > I am interested in circuitry that can be implemented by using commonly > available > TTL and analog parts. My applications/experiments are being done at HF > on 80M > with the following equipment: > > -- 10MHz TCXO system clocks > -- 50KHz chip-clock > -- 25KHz PLL reference to generate 3575KHz carrier frequency > -- (2^7 - 1) PRN code > -- +7dBm at 1st comb-line > > My DSSS transmissions have been authorized by the FCC's Seattle area > office and > have taken place for the past year over a 90 mile path. I am interested > in using a > Costas-Loop to help establish system synch and information extraction > (spotted- > owl hoots and other local forest noises as audio/data input to the ADC > at TX end). > > My present system is fairly primitive in that the chip-clock is derived > from an ~10MHz > oscillator and switched to the local "long-term-stable" 10MHz TCXO once > synch is > established. This allows me to maintain the link in the presence of > co-channel user > QRM and long (10's of minutes) QSB fades. > > I have recently received authorization to continue these tests for > another year and > plan some FHSS tests which will use an ~5MHz FH PLL I developed that > has 127 > frequency steps. This L.O. will be mixed with a 9MHz L.O. to allow FHSS > experiments on 80M and 20M. All of these L.O.'s are derived from the > 10MHz > TXCO's to reduce frequency uncertainty issues which is necessary when > dealing > with weak-signal HF-propagated signals. > > Any Costas-Loop design schematics will be appreciated and credit given > if any of my > work is published. > > 73 de w7wkr > > Dick Bingham > 5719 16th Ave N.E. > Seattle, WA 98105 > > (206) 527-3468 This word sounds pretty cool. Do you have any web page or anything describing this in more detail? Cheers, Jake -- janovetz@uiuc.edu | Once you have flown, you will walk the earth with University of Illinois | your eyes turned skyward, for there you have been, | there you long to return. -- da Vinci PP-ASEL | http://www.ews.uiuc.edu/~janovetz/index.html From jausten@tntech.edu Tue Jul 07 13:10:15 1998 Received: from tntech.edu (gemini.tntech.edu [149.149.11.7]) by tapr.org (8.7.5/8.7.3/1.9) with ESMTP id NAA14918 for ; Tue, 7 Jul 1998 13:10:13 -0500 (CDT) Received: from [149.149.39.26] ("port 2059"@cookie-monster.ece.tntech.edu) by tntech.edu (PMDF V5.1-10 #D3068) with ESMTP id <01IZ4C7BG55I8WWGQJ@tntech.edu> for ss@tapr.org; Tue, 7 Jul 1998 13:08:41 CDT Date: Tue, 07 Jul 1998 13:07:53 -0600 From: Jeffrey Austen Subject: Re: [SS:1999] Costas Loop Design In-reply-to: <35A254BB.CECDF93C@lsid.hp.com> X-Sender: jausten@gemini.tntech.edu To: ss@tapr.org Message-id: MIME-version: 1.0 Content-type: text/plain; charset="us-ascii" >I am interested in experimenting with a Costas Loop in a DSSS system. >The block >diagram for such a loop appears simple enough but I am interested in and >puzzled >by the 3rd mixer, whose two inputs are the "I" and "Q" channel data. >These inputs >are nearly at "dc" and that makes it hard to use a mixer like the >standard DBM >(SRA-1 etc.). Does anyone have a "favorite design" for the 3rd mixer >circuitry that >can be shared? Analog Devices makes a series of multipliers that work well in this application. Check out the AD532, AD 632 and similar products. We've also tried the Motorola MC1495 / MC1496 parts and found those to be difficult to work with because they are not designed to be easily DC coupled. Jeff, k9ja --- Jeffrey Austen | Tennessee Technological University jausten@tntech.edu | Box 5004 +1-931-372-3485 | Cookeville Tennessee 38505 U.S.A.