--------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: EDT00002 Date: 09/23/97 From: JOE NICHOLSON Time: 03:05pm \/To: ROB DENNIS (Read 1 times) Subj: Samoa.. -=> Quoting Rob Dennis for all to hear: <=- > Would you belive I was told I `did not know what I was talking > about' by one of the `genius' -service technicians- they sent > out to do the repair? Cox Cable technicians told me the same, then swallowed their pride when the FCC sent them back out to eliminate the interference I had originally complained about. I wasn't a subscriber and wasn't connected to the cable system, but they were overriding the TV signals I was attempting to receive with a rooftop antenna. And they had the gall to blame my 8-track player for the problem on their first trip. They were a little sheepish on the second trip, after learning that I had an FCC license. ... fire.chief@warpgate.com ___ Blue Wave/QWK v2.12 --- GEcho 1.00 * Origin: 9-1-1 FF's LEO's OSHA COMMS (619) 669-0385 (1:202/911) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: EDU00000 Date: 09/24/97 From: MARK MAGILL Time: 02:22am \/To: JEFF EDMONSON (Read 1 times) Subj: High Gain Antennas for 14 JE> For that matter, has anyone ever thought of lining up JE> several J-poles and mounting them on a mast in a Yagi JE> configuration? Interesting idea. What do you guess is typical gain for a 5/8 J-pole? Mark KC7RUB@KA7FHA.#SWOR.OR.USA.NOAM --- * Origin: Silent Echo - Coos Bay, Oregon USA (1:356/4.7) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: EDU00001 Date: 09/24/97 From: JEFF EDMONSON Time: 10:53am \/To: STAN BLACK (Read 1 times) Subj: High Gain Antennas for 14 > Hi Jeff! Wayne told me how to use a j-pole as the driven > element on a yagi. Just keep the matching stub below the > reflector and the directors and it will work great! I'm sure it would! > He claims that if you point the matching stub in the same > direction as the other elements, It will add more gain > in trasmit and recieve. Gotta try it sometime! The thing is, if the driven element is cut to frequency and used as a director, how long are the driven elements, and the reflector? In a Yagi configuration, not all the driven elements are the same length, but they -are- smaller than the driven element. The reflector(s) is(are) normally larger than the driven element. Regards, -Jeff --- FMail 1.02 * Origin: Electronic Avenue BBS 210-533-5668 San Antonio, TX (1:387/510) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: EDU00002 Date: 09/24/97 From: HENRY EDGINTON Time: 02:21am \/To: ROB DENNIS (Read 1 times) Subj: High Gain Antennas for 148mhz Rob Dennis wrote in a message to Henry Edginton: RD> How much gain are you looking for Henry? RD> A commercial Cushcraft 13B-2,2m beam (13 elements) is 15db RD> gain,with a total boom length of 15 feet and fed with a RD> matching co-ax transformer. Sound like something you want a RD> design for? I have a 15.5 foot boom 11 element beam now,What I am refering to is the high gain omni's like diamond 500,Sinclair and like the station master used for alot of repeaters.I have tons of stuff on beams however i am also looking for a program to design qubical quads for vhf & up for 5 to 20 elements.I have seen nothing at all anywhere on high gain omni's & that surprises me. Greetings from (ve3umk@niagara.com) --- GEcho 1.11+ * Origin: Fort Erie,Ont.Can. (1:247/500.5) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: EDU00003 Date: 09/24/97 From: HENRY EDGINTON Time: 02:27am \/To: IVY IVERSON (Read 1 times) Subj: High Gain Antennas for 14 Ivy Iverson wrote in a message to Henry Edginton: II> The overall height is about 120 inches - 10 Ft., (just over II> 3 Meters), high, not counting the mounting mast. If you II> want the details I can send them to you or post them. Do II> you have netmail access? Yep,My addresses are below,That would be much appreciated,I want to collect a whole whack of designs for high gain omni's,Always someone lookin & cant afford an arm and a leg. Greetings from (ve3umk@niagara.com) --- GEcho 1.11+ * Origin: Fort Erie,Ont.Can. (1:247/500.5) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: EDU00004 Date: 09/24/97 From: IVY IVERSON Time: 05:17am \/To: STAN BLACK (Read 1 times) Subj: High Gain Antennas for -=> On -Mo-Se 97 21, Stan Black said to Ivy Iverson,<=- -=>"About High Gain Antennas fo...,"<=- Hi, Stan; SB> Couldn't you just add another colinear section and matching section SB> to the 10' antenna you have now to make it really kick? Might take SB> enclosing it in some pvc or something like that. Just a thought! Actually, I'm not too worried about the strength of the antenna, (why else would I use the PVC?), it's made of 3/4 inch electrical conduit, however the insulator between sections is a 3/4 inch dowel. I have been unable to find anything better. I would like to find someone who has 1 In. diaameter nylon rod and a lathe that could turn it down to my specs. The phasing stub is a hairpin made of #10 galvanized, threaded rod, so it would take a pretty large pipe to contain it. But my question was this: The bottom 5/8 section, (5/8 wave above the matching section), is, according to the article, 3 dB gain, and adding a second 5/8 and matching stub increases it another 3 dB to 6 dB. I would like to know _IF_ each additional 5/8 section and phasing stub will add ANOTHER 3 dB: 3+3+3+3=12 dB, (actually a little less because of losses), or if sucessive sections add less each time. I would just LOVE to get about 30-35 W ERP out of my little 5W HT, (and a booming half of a KW effective when I can afford a more powerful mobile for the shack!) IOW, if I added 2 more colinear sections, would the gain increase to aproximately 12 dB, or would it be signifigantly less? TNX ES 73 DE KB9QPM Ivy ... Double your dipoles. Double your flux. -- ,-----> Ivy's WALL BBS Home of Lakeshore Net <-----, |---------------> Ivy Iverson, KB9QPM <--------------| `-> Netmail me a request for info on Lakeshore Net <-' ___ Blue Wave/QWK v2.20 [NR] --- TriToss (tm) 1.03 - (Unregistered) * Origin: Ivy's WALL BBS - Sheboygan, WI 920-457-9255 (1:154/170) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: EDU00005 Date: 09/24/97 From: IVY IVERSON Time: 05:33am \/To: JEFF EDMONSON (Read 1 times) Subj: High Gain Antennas for 14 -=> On 09-23-97 07:17, Jeff Edmonson said to Stan Black,<=- -=>"About High Gain Antennas for 14...,"<=- Hi, Jeff; SB> Couldn't you just add another colinear section and SB> matching section to the 10' SB> antenna you have now to make it really kick? Might SB> take enclosing it in some pvc or something like that. SB> Just a thought! JE> Only if they were properly phased. Of course, each section would have it's own 1/8 wave adjustable phasing stub. JE> For that matter, has anyone ever thought of lining up several J-poles JE> and mounting them on a mast in a Yagi configuration? That is an interesting idea! If you mount them horizontally, (along a horizonatal mast), the problem of keeping them stable would, I would think, be almost insurmountable for anything below 220 MHz, unless you had them in pairs: One ponting "east" opposite one pointing "west," so they are balanced, then feed them 180 degrees out of phase. Mounting them vertically on a horizontal plane would prove interesting, as you could space and phase them to get just about any pattern you wanted. (The same way that AM broadcast towers are made directional, but on a much smaller scale). With a 9-tower array, there is an AM station near Minneapolis which pumps virtually all of it's 50,000 watts straight to Greenland! It has a pattern like a glove, with the "main bang" being the wearer's arm and five small sidelobes: there are areas only a few miles South of the antenna farm that you cannot hear the station at all, even with a good car radio! I think it would be VERY interesting to play with such an array of 6 dB (or more) J-poles on 2M! By shifting the relative phases, you could change the direction of the main lobe! (CQ Argentina?) :-} 73 DE KB9QPM Ivy ... When the band is open you can work the world on a piece of wet string! -- ,-----> Ivy's WALL BBS Home of Lakeshore Net <-----, |---------------> Ivy Iverson, KB9QPM <--------------| `-> Netmail me a request for info on Lakeshore Net <-' ___ Blue Wave/QWK v2.20 [NR] --- TriToss (tm) 1.03 - (Unregistered) * Origin: Ivy's WALL BBS - Sheboygan, WI 920-457-9255 (1:154/170) --------------- FIDO MESSAGE AREA==> TOPIC: 188 HAM TECH Ref: EDU00006 Date: 09/25/97 From: STAN BLACK Time: 12:5 am \/To: JEFF EDMONSON (Read 1 times) Subj: Re: High Gain Antennas for 14 Hi Jeff. Wayne told me to make the elements just like you would a regular yagi. 5% shorter for directors and 5% longer for the reflector. Piece of cake! I have made several yagis and quads for 2 meters. I love antennas! Oh, spacing would be like a regular yagi, also. About .15 to .2 wavelengths. Hope this helps! 73 de Stan KC5BFA --- GEcho/386 1.11+ * Origin: The Tradin' Post - Abilene, Tx (915) 676-2799 (1:392/1)