--------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: D5K00020 Date: 05/09/96 From: RAY WADE Time: 10:23am \/To: MIKE MCMAHAN (Read 6 times) Subj: Antenna Polorization On (06 May 96) MIKE MCMAHAN wrote to WAYNE SAROSI... MM> I understand all this (I think! =:^), but what I'm curious about is MM> what polarization would result if the (diamond-shaped) quad was fed at MM> the MM> TOP corner? MM> I'm assuming that it would be horizontal, the same as when fed from MM> the bottom. Another person says vertical. MM> So, which is it? You are correct, horizontal. ... The two worst aspects of censorship are and ! --- PPoint 2.00 * Origin: K5JCM, Tulsa OK (1:170/600.2) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: D5K00021 Date: 05/08/96 From: STEPHEN COKER Time: 12:14pm \/To: LARRY MCNEILIS (Read 6 times) Subj: Transverters -=> Quoting Larry Mcneilis to All <=- LM> I am looking for information and/or schematics for transverters. LM> there any made to convert 2 meter FM to 6m? How about 2m to 222mhz or LM> 70cm? Are there any transverters designed to convert to multiple LM> bands, such as 10m all mode to ALL vhf and uhf bands? Hi Larry! I use a Yaesu FT-902DM setup with matching transverter which allows me all mode operation on 6,2 and 430-440 MHz. It uses the 10 metre band positions to accomplish this. I know of one custom transverter designer who has a good reputation: MAS Enterprises (Manfred VE3ZIE) in St. Jacobs , Ont. (519)664-1273 voice (519)664-3082 Fax Hope this helps, Stephen VE3GGR ___ Blue Wave/QWK v2.20 [NR] --- PCBoard (R) v15.22/M 25 * Origin: PrimeTime * Muskoka (705)689-1757 (1:252/301) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: D5K00022 Date: 05/08/96 From: RICK BISHOP Time: 11:10pm \/To: ALL (Read 6 times) Subj: Pk12 Tnc Can anyone give me any comments on a PK12 TNC . Interested in getting into packet on 2m. Is this TNC worth the money , runs around $125.00 new Or am I just wasting my money on it. Any comments would be appreciated. 73 KF4ISB Rick --- QMPro 1.53 rick.bishop@ccc-bbs.com * Origin: The Bad Element BBS * Goshen, Ohio! *(513)625-4303/0020 (1:108/450) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: D5K00023 Date: 05/02/96 From: KENDALL BONNER Time: 11:29pm \/To: WAYNE SAROSI (Read 6 times) Subj: Re: Parabolic Antenna For -=> Quoting Wayne Sarosi to Fred Mckenzie <=- WS> In a message to Martin Campbell <25 Apr 96 14:02> Fred Mckenzie WS> wrote: FM> the focus? I think I've seen something like this before. Here is my FM> ASCII illustration of the dipoles' end view: FM> * <- Reflector Dipole FM> * FM> * FM> * FM> * FM> * * <- Active Dipole FM> * FM> * FM> * FM> * FM> * FM> What do you think, Wayne? How would this compare to a Yagi? FM> 73, Fred, K4DII WS> I think if the two end ones on each side were removed the antenna WS> might work. Gain? I couldn't say. It would be a directive antenna. WS> Might be a project to test at the EMLab. How would the math work out on something like this? and would you realy need all of the reflectors? I built something similar using 3/4 pvc,and # 14 (?)house wire for the elements,(2 pvc "V's" with center bars,connected by more pvc,and wires strung between at I think it was .2 wave length,this was for 27 mhz,three reflectors,and one director: O (my brother got all the artistic talent in the family) Being that it was for 11 meter it was a farly large O R D annenna,and being large and pvc,it didn't last long, but it seemed to work out alright,from Howard city O to Bridgeston (maybe 25 mi.hilly country) I picked up o=reflector 1 1/2 s-units(?)(recieve) and 1 (?)on transmit,(this was R=radiator over a 5/8 ground plane 20+ ft in the air) but the d=director swr was pretty high about 2.5(?):1. all in all it was an easy one to make,but all the math I knew for spacing and so on proved to be pretty much useless when I threw in the outside reflectors I didn't save any of the paperwork (6 years,and three moves ago),but I think I had to shorten spacing all around from what I figured out with the calculator.But they were real close when I first put it together as three element beam.I cant remember the exact spacing,but from the radiator to to the center ref.it was just under .2 wave,and real close to .2 with the radiator to the outside reflectors,(visibly farther if you looked close enough)and maybe .15 wave to the director. I liked t, and had I built it of stronger material I would still be using it I hink. I think that the extra reflectors in the other design would give a LOT of wind load so it would have to be,well,overbuilt,Though I think it would give some pretty good gain.(lost my mind a second there,was that a 2 mtr design?,if so it could be built with pvc and wire,or al.and still be durable (?)) Mine was mounted on a tripod on a trailor roof with maybe a 10 ft pole,roughly 12 ft,between the bottom of the anntenna and the oof I had no way to determine whether the metal roof had anything to do with the swr,or the gain I experienced,(ground plane,reflector what?)but until it fell apart I was happy to leave it the way it was. ken. ___ Blue Wave/386 v2.30 [NR] out of curiousity though,how would you determine the size of a ackplane, or reflector if you were to make it from chicken wire or something of that nature? (I mean,would the diagonal measure have an effect on it? would it have to be rounded,or would square be fine?) ken again --- EzyQwk V1.50b0 00f9005b * Origin: Ryan's Bar BBS GR MI 616/456-1845 (1:228/28) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: D5K00024 Date: 05/09/96 From: BILL RISTER Time: 06:31am \/To: MIKE MCMAHAN (Read 6 times) Subj: Antenna Polorization On 05-06-96 MIKE MCMAHAN wrote to WAYNE SAROSI... MM> I've got another question for you (or anyone else who reads this!). MM> It concerns antenna polarization. MM> The ARRL General Class License Manual states: "The polarization of MM> the signal from a quad antenna is determined by where the feed MM> point is located on the driven element. ...... MM> MM> I understand all this (I think! =:^), but what I'm curious about is MM> what polarization would result if the (diamond-shaped) quad was fed MM> at the TOP corner? .... I'm assuming that it would be horizontal, MM> the same as when fed from the bottom. Another person says vertical. MM> So, which is it? Think of it like this.. if the feedline is at a horizontal physical position the polarization is vertical. If the feedline is at a vertical physical position the polarization is horizontal. It matters not whether the position is top, bottom, left side or right side other than the fact that polarization is thought of as 90 degrees to the feed point. That's how I try to maintain sanity in remembering where to connect the feedline on my 6 meter quad. Now I have one that someone asked me the other day. What would happen if one were to mount the quad so that the sides form a square? And the feed point is in the middle of one of the squares sides? _________ | | | | |___ ___| | | <-Feedline Given that configuration, what would be the polarization? So far I haven't had the ambition to build an antenna like that to find out. But somewhere in the back of my mind I seem to recall seeing such a configuration years ago on a commercailly built antenna. ___ * OFFLINE 1.56 --- Maximus/2 3.01 * Origin: USS Pegasus/2 * Inet: 128.249.250.42 * 713-355-1194 * (1:106/9636) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: D5K00025 Date: 05/09/96 From: GREG THOMPSON Time: 12:36pm \/To: WAYNE SAROSI (Read 6 times) Subj: Kenwood TR-7625 Hello Wayne! 07 May 96, Wayne Sarosi writes to Greg Thompson: WS> Check with Paul Maserang N5PCA. He has the own and svc manuals. WS> From the HTL. How do I get ahold of him? Does he lurk in this echo? Greg Internet: kc7gnm@primenet.com Packet: kc7gnm@n1ngn.az.usa.na --- FMail 0.92 * Origin: The Nucleus II BBS (1:309/24) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: D5K00026 Date: 05/09/96 From: DANNY BURDICK Time: 12:52am \/To: LEONARD FALKNAU (Read 6 times) Subj: Re: kenwood 733 * In a message originally for Leonard Falknau, All writes: LF> just a quick note , LF> i am the proud owner of a kenwood 733 and i notice the LF> set is able to cross band repeat though this is not legal in australia i LF> think!!! LF> do other countries allow this and if so are there any power restrictions LF> on this practice. So what's not legal.....hams police themselves...and the use of the frequencies....is under a bandplan...(a gentlemans agreement) not a law... I don't know about Austrailia....but as long as you are not causing interference to anyone.....their are literally thousands of cross-banding repeaters in operation everywhere at all hours of the day and night.... Dan "Energy" KE4OZD --- LoraBBS-OS/2 v2.41b3+ * Origin: Energy (1:374/17.0) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: D5K00027 Date: 05/08/96 From: BOB DAVIS Time: 01:48pm \/To: WA4MJF RONNIE (Read 7 times) Subj: AN/PRC-77 Radio Date: 05-05-96 (07:39) From: WA4MJF RONNIE To: MICHAEL SOMERS Subj: WEIRD ANTENNAS ------------------------------------------------------------------------ Ronnie, WR> >Here is my question- Will the PRC-77 really explode if that > >battery > >vent becomes plugged? They really drill that into you head > >these > >days, but I find it hard to believe that battery could > >generate > >enough pressure in that small of space, with 1/8" metal > >casing at > >that, to explode the radio. > >Neat radios, though. 25-74mhz coverage if I remember right. > >Are they AM or FM? > > "Delta Eight One this is Zulu Niner Fower, over..." :) "Roger, out." :) WR>Hi The range is 30-75 mHz on the PRC-25/77. The 77 is all solid state and >allows X-Mode. The emission is 36F3. Ran about 5 watts. All batttery >cases were modified to have a vent to let the gas out to eliminate the >explosion dange. 73 de Ronnie MAJ, SC, USAR (Retired) Sir , The possibility of battery explosion has little to do with the vent; it has everything to do with the battery's internal chemistry encountering water -- *with certain batteries!* Certain old (the lot number can tell you when they were manufactured) batteries contain a disproportionate amount of sodium, which will react violently with H2O. When operating, the radio coupled with ambient temperature can heat up the battery, causing gases to be created by the battery's chemical reaction. It is to avoid this buildup that the vent was implaced. As I understand it, the cases didn't so much explode as pop off violently due to the gas pressure. I have never heard of the cases rupturing, sending firendly fire shrapnel at one's face. I am personally acquainted with a soldier that suffered a black eye from forceful ejection of the battery case: ME. Painful, but hardly an explosion! SPC (P) Robert P. Davis, N3OYA HHC, 2-112 INF, 28 ID (M) formerly 4th P.O.G., USASOC --- * OLX 2.1 TD * And God said: E = /mv2 - Ze2/r ...and there *WAS* light! --- InterEcho 1.12 * Origin: Syene's Machine, Reedsville, Pa (717)667-9040 (1:270/726) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: D5K00028 Date: 05/09/96 From: WAYNE SAROSI Time: 08:22pm \/To: RICHARD PLASENCIA (Read 7 times) Subj: Net Mail In a message to Wayne Sarosi <08 May 96 11:36> Richard Plasencia wrote: RP> Hello Wayne, RP> Just wondering if you got my reply to your last Netmail to me? RP> I'm not rushing you but two weeks have gone by and nothing from you RP> makes me suspicious that my "reply" key is not connected to anything. RP> 73, RP> Dick, W0RPV I haven't seen anything from you off of FIDO or at KSC directed to me. If it was sent routed it may have got lost. At the smshub I check my mail daily and have seen nothing there. The last direct netmail to you was my querry about the snail mail. -WS --- * Origin: Editor HTL, Moderator HAM_TECH (Quick 1:374/73.2)