Date: Mon, 14 Feb 94 04:30:14 PST From: Ham-Ant Mailing List and Newsgroup Errors-To: Ham-Ant-Errors@UCSD.Edu Reply-To: Ham-Ant@UCSD.Edu Precedence: Bulk Subject: Ham-Ant Digest V94 #32 To: Ham-Ant Ham-Ant Digest Mon, 14 Feb 94 Volume 94 : Issue 32 Today's Topics: BALUN FOR 2-M YAGI RG8 & PL259 Sterba Curtain Send Replies or notes for publication to: Send subscription requests to: Problems you can't solve otherwise to brian@ucsd.edu. Archives of past issues of the Ham-Ant Digest are available (by FTP only) from UCSD.Edu in directory "mailarchives/ham-ant". We trust that readers are intelligent enough to realize that all text herein consists of personal comments and does not represent the official policies or positions of any party. Your mileage may vary. So there. ---------------------------------------------------------------------- Date: Sat, 12 Feb 1994 05:33:00 GMT From: agate!howland.reston.ans.net!paladin.american.edu!darwin.sura.net!fconvx.ncifcrf.gov!mack@ames.arpa Subject: BALUN FOR 2-M YAGI To: ham-ant@ucsd.edu In article <1994Feb9.204959.12081@kodak.rdcs.kodak.com> ornitz@kodak.rdcs.kodak.com (Barry x24904/ER/167B-TED) writes: >In article <2j64ii$5ip@granny.mdd.comm.mot.com> shane@mdd.comm.mot.com >(Hugh Shane N7UAX) writes: >>Can anyone suggest a design for matching a 50-ohm coax feed to a six beam, >>2 meter Yagi. The balun designs I've seen all seem to be restricted to >>frequencies less than 100MHz. There must be a classic technique, I just >>can't find it! > >The classic VHF balun technique is the quarter-wave sleeve balun. In old days >these were often called beer-can baluns, so named because steel beer cans >were soldered together to form the outer sleeve. Another name is a bazooka. Another type of balun comes from a quarter wave stub attatched to the last 1/4 wave of the feed coax - I think the official name is a Pawsey stub, named after the Australian radio- astronomer from the '50's. I remember it being in my books in the 60's. Joe Mack NA3T mack@ncifcrf.gov ------------------------------ Date: Fri, 11 Feb 1994 14:49:00 GMT From: utcsri!newsflash.concordia.ca!pavo.concordia.ca!md_hill@uunet.uu.net Subject: RG8 & PL259 To: ham-ant@ucsd.edu In article <2jeomh$1t4@nwfocus.wa.com>, tedt@halcyon.com (Ted Thompson) writes... >Recently, I was preparing some RG 8 coaxial cable to solder into PL259. >I found that the center core conductor which consisted of several fairly >stout wires, would not go through to the tip of the 259. > >I was forced to cut off a couple of strands. > >Will anything blow up? >RG-8 cable is good for several hundred watts (at least) at HF frequencies. It is probably safe to pump 100 wats through at UHF even with several strands cut. As long as you aren't goin to run a kilowatt through it, its not all that critical. By the way, RG-8 is terrible cable, I hope you are using it indoors, because it won't last outside. 73 ============================================================= -Mark Hillier | Internet: MD_HILL@pavo.concordia.ca | Amateur: VE2HVW | PACKET: VE2HVW@VE2FKB ------------------------------------------------------------- " I hear, I forget. I see, I remember. I do, I understand" ------------------------------------------------------------- ------------------------------ Date: Sun, 13 Feb 1994 13:39:33 -0500 From: library.ucla.edu!agate!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!cis.ohio-state.edu!news.sei.cmu.edu!bb3.andrew.cmu.edu!andrew.cmu.edu!kp2a+@network.ucsd.edu Subject: Sterba Curtain To: ham-ant@ucsd.edu I have the space and the trees to put up a large sterba curtain -- 300 to 400 feet long. Can anyone tell me the best combination of strength and weight of antenna wire and insulators since a s.c. is a pretty big antenna and at that length will be pretty heavy. Thanks. Keith Poole K7MOA/3 ------------------------------ End of Ham-Ant Digest V94 #32 ****************************** ******************************