From majordomo-owner@berlioz.nsc.com Mon Mar 3 15:54:01 1997 Date: Mon, 3 Mar 97 15:54:01 PST To: jmoss From: majordomo@berlioz.nsc.com Subject: Majordomo file: list 'laser' file 'laser.9606' Reply-To: majordomo@berlioz.nsc.com Content-Length: 16094 -- >From owner-laser Mon Jun 3 14:21:55 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA15941; Mon, 3 Jun 96 14:21:55 PDT Date: Mon, 3 Jun 96 14:11:57 PDT From: jmoss (Jim Moss) Message-Id: <9606032111.AA15693@berlioz.nsc.com> To: vhf@w6yx.stanford.edu, laser Subject: 50MHz and UP Group - 6/20 meeting. Cc: KevinH@ionimplant.com, jpawlan@pawlan.com Sender: owner-laser@berlioz.nsc.com Precedence: bulk ATTENTION NORTHERN CALIFORNIAN VHF+ OPERATORS AND VISTORS to the MICROWAVE CONFERENCE The 50MHz and Up Group ---------------------- will hold its next meeting on THURSDAY evening, June 20, 1996 at 7PM At National Semiconductor Corporation, Building 31, (NSC Federal Credit Union), Sunnyvale, CA. Agenda ------ - WELCOME to VISITORS from the MTT-S Conference in SF. - ALL - Short program from NSC Wireless Products Group. - NSC - Band Activities Recap - ALL - Summary of June VHF results - Contesters - Plans for CQ VHF (July) and 10GHz contest - future participants - Laser Communications demo - WB9AJZ/N5XSA Directions: NSC Bldg 31 is located in Sunnyvale at 955 Kifer Road. From 101 exit SOUTH on Lawrence Expressway, go about 1 mile. From the intersection of Kifer and Lawrence Expressway, go West on Kifer about 1/2 mile. The building is on the right, and is labeled as NSC Federal Credit Union. Parking is in the rear. Entry is in the rear at through double doors at the right. (CM97AJ) ACCESS VIA TRAIN. >From SF: Train 68 leaves SF (4th&Townsend) at 5:35PM arrives at LAWRENCE at 6:49PM. DO NOT get off at "SUNNYVALE". Walk towards Kifer and turn left. Walk to NSC Federal Credit Union. (use cross walks at lights) about a 10 minute walk. $4.00 fare. TO SF afterwards: Train 81 leaves at 10:11 PM arrives at SF (4th&Townsend) at 11:26 PM. $4.00 fare. For more information or to volunteer to help setup/organize, please contact Jim Moss (WB9AJZ) at: WK: 408-721-6906 HM: 408-746-2789 EMAIL: jmoss@berlioz.nsc.com >From owner-laser Fri Jun 7 09:13:14 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA14819; Fri, 7 Jun 96 09:13:14 PDT Date: Fri, 7 Jun 96 09:13:12 PDT From: jmoss (Jim Moss) Message-Id: <9606071613.AA14813@berlioz.nsc.com> To: laser Subject: New Personal distance record. Sender: owner-laser@berlioz.nsc.com Precedence: bulk Last night, Kevin (N5XSA), Jim (N5TSP), and myself (WB9AJZ) went out to test our laser equipment for the contest this weekend. We successfully sent callsigns and tones across a 1.1 mile path. We used receivers similar to the ones described earlier here. The main differences were that in one we used a large PIN DIODE front end with 2 x1000 amps in series to a LM386 audio amp in one, and the other was a photo transistor setup. On both ends we used 8" parabolic mirrors, and 4mW 670nM laser pens with 555 tone modulators. We used a "non busy commericial street" in Santa Clara for the experiment. Cars were QRM! Both headlites and taillights, not to mention the cars blocking the path! (We didn't xmt when cars were in "our lane".) Headlites make a very interesting noise on the rx's! Like nuclear bombs melting phones in Doctor Strangelove! Signals were 599, with some 60Hz distortion from the streetlights and traffic signals. The larger PIN DIODE caused the opAmp to saturate when cars used their brakelights in the path! (Blocking) So we're ready to go for more! Plans for the contest include a 15 mile path from Santa Cruz to Loma Prieta, and a few less agressive ones as well. Jim WB9AJZ/6 CM87xi (or other places too) Sunnyvale, CA. >From owner-laser Tue Jun 11 11:45:28 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA04871; Tue, 11 Jun 96 11:45:28 PDT Date: Tue, 11 Jun 96 11:45:25 PDT From: jmoss (Jim Moss) Message-Id: <9606111845.AA04865@berlioz.nsc.com> To: laser Subject: VHF Contest Contacts Sender: owner-laser@berlioz.nsc.com Precedence: bulk Made short contacts to 2 grids during the contest. CM86xx to CM86xx a few 10's of feet. to N5XSA and N5TSP. CM86xx to CM87xa, about 1Km. to N5XSA and N5TSP. Ran a short attempt with CM97a?. AJ6T and I sent "flashes" back and forth across a 15 mile path from Loma Prieta to Santa Cruz. Didn't have the electronic detection setup, but sure it would have been easy. Walt didn't have a tripod and it was quite late (2AM), so he hand held the laser and shot it over my way, after some help from a local policeman with his spotlight pointing over at Walt! I returned fire and "hit" Walt numerous times with a tripod mounted laser and a hand held one. Gotta fix this aiming issue. Just takes too long. The CM86 to 86 shot was interesting in that there was fog at the time, enabling us to see the beam! Helps to get the pointing right! Also... built up a rx with a BurrBrown OP210. Seems much more sensitive than the simple photo transistors from RS. They are $9.30, and include an opamp. I ran with a 10Mohm resistor for max gain. Fully blocked at daylight due to gain. Ran a 1000x amp after it for gain to earphone. Good signals and sensitivity. Jim WB9AJZ/6 CM87xi, Sunnyvale, CA. >From owner-laser Thu Jun 13 07:58:03 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA01417; Wed, 12 Jun 96 06:38:39 PDT Message-Id: <199606121336.AA256586612@host-04.colby.edu> X-Sender: aballen@colby.edu X-Mailer: Windows Eudora Light Version 1.5.2 Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Wed, 12 Jun 1996 13:36:56 +0000 To: laser@berlioz.nsc.com From: "Art Allen, KY1K" Subject: any other recent laser contacts? Sender: owner-laser@berlioz.nsc.com Precedence: bulk Hi everyone, I've read Jim's (wb9ajz/6) recent account of a 1.1 mile laser contact and his message regarding the contest activity laser attempts. Hey, that was GREAT stuff Jim, thanks. I'm curious whether anyone else has done any other attempts or laser Q's during the vhf contest? I have to confess that I sat home and didnt take part in the contest, Summer in Maine is a short season and a major house addition and an new family member arrival (due in November) led my wife and I to the inevitable conclusion that we just didn't have the time for contesting this year. I'm also changing email addresses, so this address will drop off the list, and my other address should appear. Anyone who wants to reach me direct can use this address (I am heeping it active). Or, u can reach me at the new address (artky1k@juno.com). Either address will reach me, the juno.com servive is FREE EMAIL, so it it pretty hard to turn down hi hi. So, did anyone else make any laser Q's ??? Also, I'm esp'ly curious and anxious to hear whether anyone tested or made progress in the aiming problem? I have a brief report relative to aiming that I'm working on (an update to my ongoing research). Look for it sometime soon. 73 and GL...Art.... >From owner-laser Fri Jun 21 17:23:23 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA28795; Fri, 21 Jun 96 17:23:23 PDT From: sjnoll@ix.netcom.com Date: Fri, 21 Jun 1996 17:22:53 -0700 Message-Id: <199606220022.RAA05525@dfw-ix12.ix.netcom.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Subject: Human Eye Sensitivity Figures To: laser@berlioz.nsc.com X-Mailer: SPRY Mail Version: 04.10.06.22 Sender: owner-laser@berlioz.nsc.com Precedence: bulk Just found some interesting spec's for human eye sensitivity in International Light, Inc. catalog... 214 photons/second @ 450 nm (Blue) 10 photons/second @ 555 nm (Yellow-Green), 3.58E-18 Watt 126 photons/second @ 650 nm (red) Pretty incredibly receiver. 73, Steve J. Noll | Ventura CA | WA6EJO | sjnoll@ix.netcom.com >From owner-laser Sat Jun 22 14:35:44 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA05305; Sat, 22 Jun 96 14:35:44 PDT From: sjnoll@ix.netcom.com Date: Sat, 22 Jun 1996 14:31:23 -0700 Message-Id: <199606222131.OAA15331@dfw-ix12.ix.netcom.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Subject: New Newsgroup: alt.lasers To: laser@berlioz.nsc.com X-Mailer: SPRY Mail Version: 04.10.06.22 Sender: owner-laser@berlioz.nsc.com Precedence: bulk Just saw a new newsgroup: alt.lasers Currently contains a couple of laser for sale posts. 73, Steve J. Noll | Ventura CA | WA6EJO | sjnoll@ix.netcom.com >From owner-laser Tue Jun 25 12:02:19 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA27683; Tue, 25 Jun 96 12:02:19 PDT Date: Tue, 25 Jun 96 12:02:16 PDT From: jmoss (Jim Moss) Message-Id: <9606251902.AA27676@berlioz.nsc.com> To: laser Subject: Cheepo Transceiver page Sender: owner-laser@berlioz.nsc.com Precedence: bulk I may have mentioned this before, but the cheepo CW transceiver for laser is at: http://www.valleynet.com/~n7stu/cheapo.html Jim WB9AJZ/6 CM87xi Ready to try some cross bay testing! 670nM 5mW 700Hz modulation on TX. RX: 8" dish + pindiode x1000000 amp. >From owner-laser Wed Jun 26 14:29:19 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA25275; Wed, 26 Jun 96 14:29:19 PDT From: "Jim Fellows" Message-Id: <9606261423.ZM5725@zoinks.corp.sgi.com> Date: Wed, 26 Jun 1996 14:23:33 -0700 X-Mailer: Z-Mail-SGI (3.2S.2 10apr95 MediaMail) To: laser@berlioz.nsc.com Subject: Voice communication using laser. Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-laser@berlioz.nsc.com Precedence: bulk Hi all, I am wondering if any of you might have had success with voice commucations over laser links. Actually knowing if you had failures/not-so-goods would also be helpful. I'm thinking of exploring PWM or PCM for the modulation method. I'm also trying to find out what is used for those wireless headphones that come with some newer TVs and are also available as add-ons for home entertainment purposes. I even saw an inexpensive set a Fry's electronics Sunnyvale for somewhere in the $20 range. I might just pick one up and replace the LED's with a laser diode + ckt for laughs to see if it works. Any thoughts or tips are appreciated. Jim Fellows KF6AGJ >From owner-laser Fri Jun 28 03:52:17 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA17840; Fri, 28 Jun 96 03:52:17 PDT Message-Id: <199606281048.AA29779@personal.eunet.fi> X-Sender: oh2aue@personal.eunet.fi Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Date: Fri, 28 Jun 1996 13:43:38 +0300 To: laser@berlioz.nsc.com From: oh2aue@personal.eunet.fi (Michael Fletcher) Subject: Re: Voice communication using laser. X-Mailer: Sender: owner-laser@berlioz.nsc.com Precedence: bulk >I am wondering if any of you might have had success with voice commucations >over laser links. Actually knowing if you had failures/not-so-goods would also >be helpful. > >I'm thinking of exploring PWM or PCM for the modulation method. I have been able to PWM pointer type lasers up to several MHz, so audio modulation is no problem at all ! >I'm also >trying to find out what is used for those wireless headphones that come with >some newer TVs and are also available as add-ons for home entertainment >purposes. The ones I have seen use IR and an FM modulated subcarrier. >Jim Fellows >KF6AGJ Michael Fletcher OH2AUE _\\///_ _ _ _ (' O O ') (_()_()_) I.O.O.F. *------------ooO-(_)-Ooo---------------------------* * Michael Fletcher OH2AUE: * * Vanhaistentie 4 C 43 50 MHz * * FIN-00420 Helsinki 144 MHz * * 432 MHz * * Phone/Fax + 358 0 566 62 63 home 1.296 GHz * * Cellular + 358 50 5505 293 2.304 GHz * * Phone + 358 0 1480 7521 work 5.760 GHz * * http://personal.eunet.fi/pp/oh2aue/ 10.368 GHz * * 24.092 GHz * * Life is above 1 GHz; 474 THz * * >99.9 % of the ham bands are there..... * *--------------------------------------------------* >From owner-laser Fri Jun 28 09:38:50 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA05560; Fri, 28 Jun 96 09:38:50 PDT To: laser@berlioz.nsc.com Date: Fri, 28 Jun 1996 16:33:57 UTC Subject: Re: Voice communication using laser. Message-Id: <19960628.163508.7406.2.artky1k@juno.com> X-Mailer: Juno 1.00 X-Juno-Line-Breaks: 0-1,3,5-13,15-20,25-26,34-35,38-42 From: artky1k@juno.com (Art B Allen) Sender: owner-laser@berlioz.nsc.com Precedence: bulk --------- Begin forwarded message ---------- >I am wondering if any of you might have had success with voice commucations >over laser links. Actually knowing if you had failures/not-so-goods would also >be helpful. > >I'm thinking of exploring PWM or PCM for the modulation method. I have been able to PWM pointer type lasers up to several MHz, so audio modulation is no problem at all ! >I'm also >trying to find out what is used for those wireless headphones that come with >some newer TVs and are also available as add-ons for home entertainment >purposes. >The ones I have seen use IR and an FM modulated subcarrier. OK, keep in mind when using FM that an additional 20 db of erp is needed in order to capture the background noise. Your first 20 db of recived signal goes just to silence all the background noise! This is why we do amplitude modulation for radio dxing instead of using FM. Same concepts apply in the Thz bands. Also, regarding any type of pulse/digital communication, keep in mind that the sample rate for any analog>digital pulse conversion requires that the sampling frequency must be atleast 10 times higher than the highest frequency contained in the audio input. This means that the receiver needs to have a minimum of 30 khz bandwidth in order to capture a digitized 3 khz audio waveform. The additional bandwith in the the reciever allows more noise into the system, thus the wider the input signal is, the shorter the range of the system (just like in the RF world). For local short range communication, we can sure do wideband pulses, or we can do FM. But, using these modes, your range will be much less than optimum and you will pay the price. There is no free ride. Did anyone besides Jim do any laser contacts during the vhf contest? 73 and GL...Art.. >From owner-laser Sat Jun 29 01:30:56 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA28900; Sat, 29 Jun 96 01:30:56 PDT Date: Sat, 29 Jun 96 01:30:49 PDT From: root (Operator) Message-Id: <9606290830.AA28893@berlioz.nsc.com> To: 16128, laser, outscr, standard, stream, tpcsch, ts3040, usageman Subject: krueger: disk warning Sender: owner-laser@berlioz.nsc.com Precedence: bulk Please remove any unnecessary files. Disk /home/telstd (/dev/sd6c) is 99% full. The top users are: 363830 /home/telstd/standard 303355 /home/telstd/laser 189845 /home/telstd/outscr 168147 /home/telstd/stream 63563 /home/telstd/tpcsch 31057 /home/telstd/ts3040 8 /home/telstd/lost+found 2 /home/telstd/tp4410sc >From owner-laser Sun Jun 30 01:27:52 1996 Return-Path: Received: by berlioz.nsc.com (4.1/SMI-4.1) id AA01545; Sun, 30 Jun 96 01:27:52 PDT Date: Sun, 30 Jun 96 01:27:40 PDT From: root (Operator) Message-Id: <9606300827.AA01534@berlioz.nsc.com> To: 16128, laser, outscr, standard, stream, tpcsch, ts3040, usageman Subject: krueger: disk warning Sender: owner-laser@berlioz.nsc.com Precedence: bulk Please remove any unnecessary files. Disk /home/telstd (/dev/sd6c) is 99% full. The top users are: 363830 /home/telstd/standard 303355 /home/telstd/laser 189845 /home/telstd/outscr 168147 /home/telstd/stream 63563 /home/telstd/tpcsch 31057 /home/telstd/ts3040 8 /home/telstd/lost+found 2 /home/telstd/tp4410sc