--------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: E3P00001 Date: 03/18/97 From: WAYNE SAROSI Time: 06:59pm \/To: ROB DENNIS (Read 3 times) Subj: package In a message to Wayne Sarosi <16 Mar 97 13:55> Rob Dennis wrote: > WS> Does anyone want to see some of the old reruns of the past series > WS> on antennas for various uses? RD> Please Wayne. RD> I lost a few of them when a floppy died on me. RD> Thanks. RD> Did you get the packet of stuff I sent last week yet ? RD> All the info for Canadian amateurs and some 11m stuff. Nothing yet. But the mail is s-l-o-w. -WS --- XRS! 4.50+ * Origin: KB4YLY, Moderator (1:374/73.2) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: E3P00002 Date: 03/18/97 From: WAYNE SAROSI Time: 07:36pm \/To: RAY WADE (Read 3 times) Subj: "Duck" range tests In a message to Ray Wade <17 Mar 97 19:01> Wayne Sarosi wrote: > RW> Whoever did it had access to an antenna range at his place of > RW> employment. I thought you were the only one in here that had that > RW> capability. As I recall the tests were done with a Kenwood talkie > RW> (did/do you have one?). The worst duck was 7 db down and the best (which > RW> happened to be the duck that came with the talkie) was the best. > RW> Maybe it is in your *paper* (non-elontronic) files? WS> It could be. I'll check again. I remember something of that now WS> that you mention it. I do have a Kenwood. I belive it was the standard WS> kenwood duck, one of those telescoping super hod rods, a quarterwave, WS> a stubby and a couple of others? Sound right? I'll look. I do remember WS> doing that test but I think it was just a test, no paper other than some WS> notes so that would be on disk. I'll check again. It maybe on tape. WS> I didn't get much of a response on it so I didn't repost it. It may WS> however be on the end of one of those CD call books. Ray, I went through every file on the hard drive and all the paper files I have, even my old notes from the EMLab. Nothing. It is possible that the posting was made directly from some scratch notes maybe asked for by a reader. I may have done the test on request, scratched down the notes and then posted them that night in a reply. The best bet in finding that posting is from people that save that stuff. There are some that have a copy of many of my postings on disk. Who? I couldn't say. If some one has that CD call book there are many postings after the listings as 'fill'. It might be in there. Sorry, I checked through everything. -WS --- XRS! 4.50+ * Origin: KB4YLY, Moderator (1:374/73.2) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: E3P00003 Date: 03/18/97 From: WAYNE SAROSI Time: 08:35pm \/To: ALL (Read 3 times) Subj: Wire antennas-5 SUBJECT: Wire antennas - part 5 RHOMBICS I've talked about rhombics before and in this posting I would like to discuss the rhombic for use in the UHF range. We have hashed over rhombics in the HF range and many antenna books discuss this antennas. Most AROs don't have the room on their property or do not have property to construct a rhombic on. There seems to be very little on rhombics for UHF work. After looking at some plans for a multi-element rhombic on 70cm, I decided to modify the plans and came up with a 23cm, 12 element rhomboid. The official name is a dual hexamerous rhomboid which is 2X6 rhomboid antenna. The antenna has twelve elements, with a gain of 33dBi, an is no bigger than a TV antenna! On 70cm, the antenna is 19-ft long (apprx) and below that I wouldn't bother unless you have the tower and room. Unless you can mount a B-52 to a tower, 2m is out of the question. Testing on the 23cm DHR shows a Front to back ratio greater than 30:1 with front to side ratios about the same. This is a true cannon. The main lobe is tight at 12 degrees both vertical and horizontal. Matching is a bit difficult since micro-strip knowledge is a must. Although the antenna is 50 ohms balanced, the frequency demands exactness. This involves phasing elements, stripline baluns, and hardline feeds. But for the 23 experimenter, this antenna packs the punch of a large parabolic reflector and in a small package. I'll be giving the details in the next posting. -WS --- XRS! 4.50+ * Origin: KB4YLY, Moderator (1:374/73.2) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: E3P00004 Date: 03/18/97 From: WAYNE SAROSI Time: 08:37pm \/To: ALL (Read 3 times) Subj: Wire antennas-6 SUBJECT: UHF Rhombic In wire antennas part 5 we discussed the UHF Rhombic antenna. I have the plans for one here. This antenna is called the Dual Hexamerous Rhombiod or DHR. A stripline balun provides a 50 ohm output for interface with hardline or antenna switch. The antenna consists of two stacked six element rhomboids. Each six element rhomboid consists of six rhombics of which each rhombic is 19 wave lengths and four sided. Each rhombic is terminated at the 9.5 wave length mark with a *** 2w resistor. Each rhombic is geometrically interfaced to a wooden frame with a common start and ending point. Nineteen wave lengths was choosen for gain and front to back ratio. The actual plans for this antenna are available via the snail mail through me. Please include a legal size envelope and one stamp. The BALUN is the key to the antenna and I would recommend this for those who are into 23cm and have stripline experience. Note: 18MAR97 I might still have these plans but don't count on it.-WS -+----------------------------- Folded Marconi This is an easy antenna to construct and I recommend this highly for those AROs who have limited room and desire an antenna that performs better than most wire antennas. The design is easy. Cut a length of 300 ohm ribbon cable (TV line) using the following formula: 246/fMHz ex: At 7.15MHz the Folded marconi length would be 246/7.15 or 34.4 feet. Cut back about 1/2 inch and expose the leads in the ribbon cable. Twist them together and solder. Seal with RTV. Punch a hole about one inch down from the soldered end and run a cable tie through the hole and save for later. At the other end, expose about 3/4 inch of lead and solder one lead to the center conductor of your coax. The other lead is attached to a ground plane system or ... use the roof flashing on your house. You can ground the roof flashing and suspend the folded marconi over the house. This is the setup I have used here at the QTH. The antenna was suspended over the house from my tower to the Palm tree in the front yard. The vertical height was 25 feet and the rest was horizontal. With this antenna, the greater the vertical section the better. You will need a tuner with this antenna as the impedance is very low. -WS --- XRS! 4.50+ * Origin: KB4YLY, Moderator (1:374/73.2) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: E3P00005 Date: 03/17/97 From: DAVID LAWSON Time: 09:40pm \/To: STEPHEN KELLAT (Read 3 times) Subj: W1AW RTTY Bulletin Reception you bet! I do not remember any of the names, but yes programs of that type do exist. I have seen them that use a homemade (small and simple) interface and I have seen one that uses a soundblaster to "decode" the signal. Check out some BBS's. --- Maximus 3.01 * Origin: The AmaRad BBS (1:362/1110) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: E3Q00000 Date: 03/20/97 From: RAY WADE Time: 10:56am \/To: ALL (Read 3 times) Subj: "Duck" range tests On (18 Mar 97) Wayne Sarosi wrote to Ray Wade... WS> In a message to Ray Wade <17 Mar 97 19:01> Wayne Sarosi wrote: > RW> Whoever did it had access to an antenna range at his place of > RW> employment. I thought you were the only one in here that had that > RW> capability. As I recall the tests were done with a Kenwood talkie > RW> (did/do you have one?). The worst duck was 7 db down and the best (which > RW> happened to be the duck that came with the talkie) was the best. > RW> Maybe it is in your *paper* (non-elontronic) files? WS> It could be. I'll check again. I remember something of that now WS> that you mention it. I do have a Kenwood. I belive it was the standard WS> kenwood duck, one of those telescoping super hod rods, a quarterwave, WS> a stubby and a couple of others? Sound right? I'll look. I do remember WS> doing that test but I think it was just a test, no paper other than some WS> notes so that would be on disk. I'll check again. It maybe on tape. WS> I didn't get much of a response on it so I didn't repost it. It may WS> however be on the end of one of those CD call books. WS> Ray, WS> I went through every file on the hard drive and all the paper files WS> I have, even my old notes from the EMLab. Nothing. It is possible that WS> the posting was made directly from some scratch notes maybe asked WS> for by a reader. I may have done the test on request, scratched WS> down the notes and then posted them that night in a reply. WS> The best bet in finding that posting is from people that save WS> that stuff. There are some that have a copy of many of my postings WS> on disk. Who? I couldn't say. If some one has that CD call book Anybody have this file? ... ... I like children... but I don't think I could eat a whole one. --- PPoint 2.00 * Origin: K5JCM, Tulsa OK (1:170/302.4) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: E3R00000 Date: 03/20/97 From: CHARLES MOODY Time: 04:29pm \/To: ALL (Read 3 times) Subj: My first J-pole Well I have built my first copper J-pole. I am quite happy with it. Here are the SWR results. 20w 60w 144.000 1.1 1.4 145.000 1.1 1.3 146.000 1.1 1.2 147.000 1.1 1.1 148.000 1.1 1.1 149.000 1.1 1.1 I think my cut of 57 1/2 and 19 1/2 should be extended out a bit. Being that the lower the frequency, the longer the antenna etc. I would have liked to have gotten things a little more center balanced on the band. I did move my feed points for over and hour, and this is the best I could get it to match. I did make a 5 inch coil with 4 turns of coax along the bottom of the antenna, and that helped. Well at 20watts the J-pole is dead flat, but as soon as you get to high power the SWRs come up a bit. Any ideas to make a J-pole that is more a match at around 145.000? Should I make my cuts a tad longer? O n t h e m i k e o r o n t h e b i k e ! ____ ,\ 73s \___`\====/~~~__C Chuck KB0RVD ,-,`\`\ \==/`\\-, Minot North Dakota | o====]( O ) | o | 1991 Kawasaki clm@minot.ndak.net `-` _/'` '-` 550 Zephyr * OLX 2.2 * It's always darkest just before you step on the cat. --- WILDMAIL!/WC v4.12 * Origin: Daedalus Online, Minot ND (701)857-6090 (1:14/648.0) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: E3R00001 Date: 03/21/97 From: JAMES CHANCE Time: 06:39pm \/To: ALL (Read 3 times) Subj: AEA PK-232 documentation Hello All! I ran across a deal I couldn't turn down... I've got an AEA PK-232 (*not* an MBX), and no documentation whatsoever... If someone out there has a manual they'd be willing to photocopy, I'd willing pay the cost. Or if someone knows of a website that would have info on this outdated TNC, I'd really appreciate finding out about it... Jim N3TKD jchance@os2bbs.com ... A $300.00 Picture tube will protect a 10 cent fuse by blowing first. --- GoldED/2 2.50+ * Origin: Remnants of The Last Relay (1:109/588) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: E3R00002 Date: 03/21/97 From: STAN BLACK Time: 10:55pm \/To: CHARLES MOODY (Read 3 times) Subj: Re: My first J-pole Hi Charles! If you will make your cuts about 60" on the long leg, you will flatten out the curve. I also added a brass bolt on the 19" piece. That way could tweak the swr's very flat! All this and you can use it on 440 also! Next you may want to try a double j-pole!! I'm going to!! Hope this helps. de Stan kc5bfa --- GEcho/386 1.11+ * Origin: Great Beta Video System For Sale, Includes Movie (1:392/11)