Date: Wed, 6 Jul 94 04:30:16 PDT 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 #212 To: Ham-Ant Ham-Ant Digest Wed, 6 Jul 94 Volume 94 : Issue 212 Today's Topics: CHEAP 2m Beam antenna Coax Commercial 33 cm Yagi? extending "ladder line" GAP Eagle Antenna -- Anyone Have Experiences? Large HF DX antenna modifying RS fm beam for 2METERS More on the QST compact loop antenna NEC Request help identifying this antenna. Where is KLM - Need parts for KT-34XA 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: 5 Jul 1994 22:06:51 GMT From: ihnp4.ucsd.edu!sdd.hp.com!nigel.msen.com!heifetz.msen.com!koechig@network.ucsd.edu Subject: CHEAP 2m Beam antenna To: ham-ant@ucsd.edu darrylb@delphi.com wrote: : Ed Bathgate writes: : : >Well... I was at my local Radio Shack talking with the manager about : >the inverted V antenna, when he mentioned about somebody having a modification : >for RS fm yagi antenna. Quite simple modifications, remove 1 element entirely, : >shorten remaining elements, shift position of a couple and attach coax to : >driven element and use non metallic pole for vertical mounting. It provided : >an estimated 10 of gain with a very sharp pattern, for less than $20.00 : > : >Any Interest? : > : >He had only 1 copy, but I am sure he will let me borrow it and copy and post. : : : Yes, I'm interested. KD4CSW Me Too N8PKA ------------------------------ Date: Tue, 5 Jul 1994 20:24:48 GMT From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!newsxfer.itd.umich.edu!zip.eecs.umich.edu!panix!ddsw1!indep1!clifto@network.ucsd.edu Subject: Coax To: ham-ant@ucsd.edu I just happened to be looking at an old AES catalog and stumbled on the page showing Belden coax. I noticed that the specs for 9251 (8A/U) and 8267 (213/U) as shown are nearly identical, down to noncontaminating jacket and all. (Center conductor, #13 stranded copper; doesn't sound like 213 to me.) Am I missing something here? -- Optimists say, "The glass is half full." Cliff Sharp Pessimists say, "It's half empty." WA9PDM We realists say, "Before I decide, clifto@indep1.chi.il.us tell me what's in the glass." ------------------------------ Date: 6 Jul 1994 01:22:02 GMT From: ihnp4.ucsd.edu!swrinde!howland.reston.ans.net!math.ohio-state.edu!news.acns.nwu.edu!solo.eecs.nwu.edu!hpa@network.ucsd.edu Subject: Commercial 33 cm Yagi? To: ham-ant@ucsd.edu Hi there, do anyone of you know where I could find a reasonably sized 33 cm (902-928 MHz) premanufactured Yagi antenna? I unfortunately have no capability to make my own. With "reasonably sized" I mean something with a single-digit gain over a dipole. All the catalogues I have looked in list only 2 m, 1.25 m, 70 cm and 23 cm. Thanks in advance, /hpa -- INTERNET: hpa@nwu.edu FINGER/TALK: hpa@ahab.eecs.nwu.edu IBM MAIL: I0050052 at IBMMAIL HAM RADIO: N9ITP or SM4TKN FIDONET: 1:115/511 or 1:115/512 STORMNET: 181:294/101 Allah'u'abha Amicule, deliciae, num is sum qui mentiar tibi? ------------------------------ Date: Tue, 5 Jul 1994 15:23:48 GMT From: ihnp4.ucsd.edu!swrinde!howland.reston.ans.net!darwin.sura.net!news.Vanderbilt.Edu!news@network.ucsd.edu Subject: extending "ladder line" To: ham-ant@ucsd.edu and PFEIFFEM@ctrvx1.Vanderbilt.Edu (PFEIFFEM_1) comments... Just splice in the new length of twin lead and let the tuner do the work. BTW, you can add strength to the ladder line by running 1/4" rope through the holes and tieing it off. Good DX, K5WIM ------------------------------ Date: Wed, 6 Jul 1994 01:03:14 GMT From: netcomsv!netcom.com!herbr@decwrl.dec.com Subject: GAP Eagle Antenna -- Anyone Have Experiences? To: ham-ant@ucsd.edu Kim, Thanks for your post. Although I haven't worked with the GAP Antenna I have been considering it for use at my QTH. I am trying to get back on HF, after several years of QRT. I have antenna rerstrictions, so I am looking for something I can put up that wont draw attention, but I want it to get out! I was considering the GAp and the R7 vertical. I'll be interested in any other postings from anyone with additional thoughts to share. 73, Herb - kg6ok -- herbr@netcom.com ------------------------------ Date: 5 Jul 1994 18:47:10 -0500 From: ihnp4.ucsd.edu!swrinde!howland.reston.ans.net!math.ohio-state.edu!hobbes.physics.uiowa.edu!news.uiowa.edu!blue.weeg.uiowa.edu!blue.weeg.uiowa.edu!not-for-mail@network.ucsd.edu Subject: Large HF DX antenna To: ham-ant@ucsd.edu I'm interested in suggestions for an efficient and inexpensive DX HF antenna. I'd prefer an all-bander. I work 80 m and 10 m from a Kenwood TS-440S (has internal tuner) I am on a farm, with tall trees, barns, windmill, etc and can build a very large antenna. I'd like it to be efficient (so I can jsut use my 100 wat transmitter) and inexpensive. I have the ARRL antenna book, so suggestions supporting particular designs there I can look up. Any problem areas are especailly welcome. Thanks -- Jim - Farmer - Iowa City, IA, ------------------------------ Date: Tue, 5 Jul 1994 22:24:24 GMT From: ihnp4.ucsd.edu!swrinde!gatech!news-feed-1.peachnet.edu!news.duke.edu!godot.cc.duq.edu!nntp.club.cc.cmu.edu!cantaloupe.srv.cs.cmu.edu!dolphin!ed@network.ucsd.edu Subject: modifying RS fm beam for 2METERS To: ham-ant@ucsd.edu I shortened some of the details so it would not be as lengthy. Ed N3SDO Happy building. Ed N3SDO ** I built one and discovered some length differences in the elements. ** My opinion, build it to the longer lengths N3KMJ specs, and try tweaking for ** best results, then if it doesent work try trimming to N3SDO shorter lengths. ** Post your results or email Ed@fore.com and I will compile the results. ** Perhaps a NEC expert will model this and give us some tips! ** I bet this will make a long thread for weeks to come... {:-) Ed N3SDO ___________________________________________________________________________ 5 ELEMENT 2 METER BEAM FOR UNDER $20?!? ** THESE PLANS WERE TYPED IN AND SHORTENED BY ED N3SDO. ** Converting the Radio Shack FM stereo yagi cat # 15-1636) for 2 meter use. by Eric Allison N3KMJ. Tell your friends you got the info from N3KMJ and PGH HILLTOPPERS. Materials List: drill, 5/8" & 1/16" bits cutters/tin snips assorted screwdrivers & wrenches... qty 6 5/8" long sheet metal screws 2 pieces 4" heavy stranded wire (16-18 ga) misc wood mast or pvc (needed for vert mount only) sealant for connections... INSTRUCTIONS: STEP 1: Drill holes in boom for vertical mounting using 5/8" bit, same position as existing holes on sides, but on top/bottom for mounting vertically. (for ssb use skip this step) STEP 2: Unfold antenna, & snap elements in place. Using cutters remove all crossing wires from elements with plastic insulators. (cut as close to rivet as possible) STEP 3: Completely cut off element between director 2 & 3 (see diagram) as close to boom as possible. You can completely remove element & bracket by drilling out main rivet to boom. (save this for scrap box future use) {:-) STEP 4: Drill 1/16" holes at base of each element, just below the rivets on directors 1,2 and driven element. Install sheet metal screws 1/2 way. These are the plastic mounted ones. Be careful to make sure element will snap in place with screw installed. STEP 5: Wrap bare stranded wire around left screw on director 1, to right screw on director 1, tighten screws & cut off excess. (shorting elements together, left to right to make dipole director) Then do the same for director 2. STEP 6: (ORIGINAL PLANS, LONG LENGTHS N3KMJ) ** NOTE ** THESE LENGTHS DID NOT WORK FOR ME, SEE BELOW. Cut elements to length. REFLECTOR: 57 1/2" DRIVEN ELE: 38 1/2" DIRECTOR 1: 37 1/4 DIRECTOR 2: 36" DIRECTOR 3: 34 1/2" ============================================================================= SHORTER LENGTHS BY N3SDO - DETERMINED EXPERIMENTALLY BY SWR & PATTERN TESTS REFLECTOR: 43" (ALSO CONSIDER TRIMMING REF TO 40") DRIVEN ELE: 35.5" (SWR ABOUT 1.5:1 MIN AT 146 MHZ) DIRECTOR 1: 34.5" DIRECTOR 2: 34.2" DIRECTOR 3: 33.75" (N3SDO PLANS TO CONTINUE EXPERIMENTING AND WILL POST RESULTS) FIELD STRENGTH TESTS SHOW FORWARD LOBE FS10 WITH BACK LOBE UNDER FS1, BUT STILL THERE. NO SIDE LOBES DETECTABLE. . < FS 10 . . . . . . . . . . | Hello! I am a relatively new ham (ke6cbr), and would like to do some .>antenna design. I picked up MININEC3, and tried to run some figures .>through it, but my designs had too many elements for it to handle. What .>I would like to find is the maxiNEC program. I understand it's up to .>about version four, and that it's written in Fortran. This is not a .>problem. Any help finding the entire NEC program (or even NECPAR.INC) .>would be terrific. .> .>73 .>Thomas (ke6cbr) NEC2 (both source code and compiled versions) for PC's, Sun's, Mac's and IBM RS's plus related utilities can be found at the following location: ftp.netcom.com in /pub/rander/NEC Happy simulating es 73's, Ray WB6TPU ---------------------------------------------------------------------------- This response does not represent the official position of, or statement by, Sun Microsystems Incorporated. The above data is provided for informational purposes only. It is supplied without warranty of any kind. ---------------------------------------------------------------------------- /\ \\ \ \ \\ / / \/ / / Raymond E. Anderson WB6TPU / / \//\ Signal Integrity Engineer \//\ / / Sun Microsystems / / /\ / 2550 Garcia Ave. MS MIL04-16 / \\ \ Mountain View, CA 94043-1100 \ \\ \/ (408) 276-5224 (408) 956-0492 fax raymond.anderson@Sun.Com ------------------------------ Date: 5 Jul 1994 09:41:22 -0500 From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!math.ohio-state.edu!darwin.sura.net!nntp.st.usm.edu!whale.st.usm.edu!not-for-mail@network.ucsd.edu Subject: Request help identifying this antenna. To: ham-ant@ucsd.edu What, if anything, can be known about an antenna taking the following basic form? ____ ____ | = | | |---= | | | = | | = | | | =---| | | = | | | | = ANTENNA ---> |---= 7' 150' | = = | | | =---| | | = | | | | | | | ____| | ------|------ | | | | | WOOD | | | PILING | | | | | Z Z Z | | | | | _____________| Note that the antenna is constructed in a single plane. Viewed from above, it would look something like this.... ______ / \ / \ | | | -o---O---o- | | | \ / \_______ / Is it possible to tell if it is a recieving antenna? Is it possible to determine the direction of the incoming signal if I know what direction the antenna is facing? Do we have any idea what its range of frequency might be? Is there anything that this design tells us about its use? Thanks for any help you might be able to offer. WMW (wwatkins@whale.st.usm.edu) ------------------------------ Date: 5 Jul 1994 09:07:43 -0700 From: ihnp4.ucsd.edu!usc!nic-nac.CSU.net!charnel.ecst.csuchico.edu!yeshua.marcam.com!news.kei.com!ssd.intel.com!chnews!ornews.intel.com!ornews.intel.com!not-for-mail@network.ucsd.edu Subject: Where is KLM - Need parts for KT-34XA To: ham-ant@ucsd.edu In article dgf@netcom.com (David Feldman) writes: >Need spare parts for KT-34XA - can't find KLM - help!!!!!! KLM antenna in Seattle, WA = 206-794-2923 -- zardoz@ornews.intel.com WA7LDV ------------------------------ End of Ham-Ant Digest V94 #212 ******************************