Date: Tue, 28 Dec 93 04:30:16 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 V93 #155 To: Ham-Ant Ham-Ant Digest Tue, 28 Dec 93 Volume 93 : Issue 155 Today's Topics: 11M >> 6M 5, 10, 15MHz Antenna Ideas Wanted (2 msgs) definition of "matched" Information Needed License Ten-Tec 228 Tuner info ??? Yagi Polarization Question 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: Mon, 27 Dec 93 15:50:45 EST From: vnet.IBM.COM@uunet.uu.net Subject: 11M >> 6M To: ham-ant@ucsd.edu I've been given an old 1/2-wave CB (11M) antenna. I'm wondering if it is reasonable to modify it for 6M FM use. The vertical is in four pieces, so if I take two out, it is about the right length for 6M 1/2-wave. Do I also need to adjust the ground-plane rods? Any pitfalls or other suggestions regarding the suitability of this antenna for 6M FM? Regards, Evan Jennings ------------------------------ Date: Mon, 27 Dec 93 20:56:00 -0600 From: ddsw1!cronos!mike.brand@uunet.uu.net Subject: 5, 10, 15MHz Antenna Ideas Wanted To: ham-ant@ucsd.edu Hello Netters, I have a Heathkit "Most Accurate Clock" for which I am in need of a better antenna. The "Most Accurate Clock", for those that don't know, receives and decodes WWV Time Information from Colorado, I am located in a small suburb 30 miles SW of Chicago, IL. Reception has been poor as of late, I need a better antenna than the standard whip. A long wire antenna is out of the question, I have a small lot. I was thinking about the MFJ-1022 300KHz-200MHz Active Antenna as a solution to my problem. There may be other solutions, I don't know, thats why I turned to the net. Any comments, solutions, or reccomendations would be very welcome. Mike Brand, N9TLV The Keeper of Time BBS mike.brand@cronos.mcs.com (815) 886-0177 ------------------------------ Date: Tue, 28 Dec 1993 04:42:26 GMT From: netcomsv!netcom.com!fmitch@decwrl.dec.com Subject: 5, 10, 15MHz Antenna Ideas Wanted To: ham-ant@ucsd.edu Sysop (mike.brand@cronos.mcs.com) wrote: : Hello Netters, : I have a Heathkit "Most Accurate Clock" for which I am in need of a : better antenna. The "Most Accurate Clock", for those that don't know, : receives and decodes WWV Time Information from Colorado, I am located in : a small suburb 30 miles SW of Chicago, IL. Reception has been poor as of : late, I need a better antenna than the standard whip. A long wire : antenna is out of the question, I have a small lot. : I was thinking about the MFJ-1022 300KHz-200MHz Active Antenna as a : solution to my problem. There may be other solutions, I don't know, : thats why I turned to the net. Any comments, solutions, or : reccomendations would be very welcome. : Mike Brand, N9TLV The Keeper of Time BBS : mike.brand@cronos.mcs.com (815) 886-0177 i use a 40/30/20 meter dipole made out of 300 qhm tv type twin lead in the attick for my "MAC"... works great!... just don't sit and watch for the clock to set itself after you plug it in and connect it to the antenna... hi... just come back the next day and it will be ticking away... i think the delay in the clock setting itself is a real bummer... you should be able to manually set it... all that would have been needed was a couple of push button switches and a few lines of software... anyway, i have a program that will poll the clock and set the time in your pc if anyone needs it... mitch, wa4osr -- ------------------------------------------------------------------------------- fmitch@netcom.com Felton "Mitch" Mitchell, WA4OSR in Mobile, Alabama USA 205-342-7259 home, 205-476-4100 work, 205-476-0465 FAX co-sysop for W4IAX bbs running fbb ... sysop for WA4OSR DXCluster in Mobile.. ------------------------------------------------------------------------------ ------------------------------ Date: Tue, 28 Dec 1993 05:18:33 GMT From: munnari.oz.au!metro!dmssyd.syd.dms.CSIRO.AU!somlo@network.ucsd.edu Subject: definition of "matched" To: ham-ant@ucsd.edu In article , Drew Diamond wrote: >In article kg7bk@indirect.com (Cecil Moore) writes: >>From: kg7bk@indirect.com (Cecil Moore) >For example, say the SWR on the line is measured as 2.0; a mismatch >therefore exists somewhere between the radio and antenna. Now if the >tuner is interposed between the SWR meter and line, it may be possible to >bring the SWR BETWEEN THE RADIO AND TUNER down to 1.0 with correct >adjustment of the tuner. However, the SWR, beyond the tuner, in the section >of line which runs to the antenna will still be 2.0 (assuming no significant >harmonic energy is present at the output of the radio). > >73, Drew, VK3XU Telecom Australia Research Laboratories. The above statement needs qualification. I the transmission line (which could be a multi-section mismatched set) is loss-free, then AT ONE FREQUENCY, if a tuner is inserted at the receiver and is set to a matched condition, all the available energy will get into the receiver (despite the fact that somewhere along the line there are a set of reflections). If the line(s) are lossy, this is no longer possible. (At one frequency, the complicated set of lines may be modelled as a single line with a mismatch.) -- Dr Peter I. Somlo FIEEE | CSIRO Div. Appl.Phys. | "Every coin has three Microwave Res.Sci.(ret.)| Natl. Meast. Lab. | sides - at least" TEL/FAX: 61-2-451-2478 | POB 218 Lindfield 2070| (Somlo, cca. 1985) ^^home^^ | NSW AUSTRALIA | elm:somlo@dap.csiro.au ------------------------------ Date: Mon, 27 Dec 1993 13:28:55 -0700 From: orca.es.com!cnn.sim.es.com!msanders.sim.es.com!user@uunet.uu.net Subject: Information Needed To: ham-ant@ucsd.edu In article <2fkqfe$mbf@mailer.fsu.edu>, dreid@mailer.fsu.edu (Debi Reid) wrote: > Hello all.... > > I have just recently become rather intrested in radio-packet > digital communications. Anyrate, I need some information to > help me get started... I am intrested in learning more about > AX.25 packet modem networks, how they operate and equipment > needed (What sort of modem.... 9600bps... what TNC? Software > ???? JNOS???? KA9Q??? huh?) Anyrate, i am pretty lost so > basic info would be greatly appricatied... > > BTW: And I might get screamed at, but will a codeless lice. > be enough? I know a good bit of electronics, should I go > for some sorta tech, in order to learn more..... > > Lost...... tats me Debi: No flames, no screams. I was there a few months ago myself. This hobby has so many facets, that a few questions to get you going in the right direction is usually enough to blast off with. If you can talk on 2M, you can send packet on 2M (no-code tech is great - my 12 yr old is there and consuming my packet station at a tremendous rate. Have to figure a way to get it back from him!). A good ol' XT computer, or anything newer will work fine. Also Macintosh, Commadore, COCO II, APPLE, etc. can be used, but I recommend an IBM compatible, especially if you have a working knowledge - more software, more experience, etc. are there to help you (no flames guys, I have a MAC at work, a Zenith Z-100, a COCO II, and several PC's, and still recommend the PCs). The TNC takes info from the computer program (and you type in the commands and text) and operates the radio to send, and picks up what comes back. The TNC usually has a built-in modem (nominally 1200 baud, at least for 2 meter) to take care of the information transfer. The toughest part for me right now, is figuring out and assembling the cables required to go between the computer, the TNC and the radio. These are serial type communications, and RS-232 is a nebulous standard. You should have seen my machinations with my Yeasu FT-2400 and the 8 pin flat cable telephone connector required to hook it up to the TNC! But it works. So Debi: pretty simple: computer, software, cables, TNC, and radio. I would suggest getting a couple of reference books to have around and give you the specific commands, and show you what you could expect to see coming across the screen. "Your Packet Companion" put out by the ARRL for about $8 is the one I got. There are 5-6 other ones available. And if you can find another packeteer to help, you will be in business. Have fun, Milt -- ========================================================================= Opinions, thoughts, &cetera are my own (when I can remember them). "He flies the sky KB7MSF Like an Eagle in the eye UTAH of a hurricane that's abandoned." America ------------------------------ Date: Tue, 28 DEC 93 00:05:53 EST From: library.ucla.edu!agate!howland.reston.ans.net!spool.mu.edu!bloom-beacon.mit.edu!noc.near.net!news.delphi.com!usenet@network.ucsd.edu Subject: License To: ham-ant@ucsd.edu They would be most happy to direct you the the national organization for hams in Canada. The test questions are different. Though, many Canadians are members of the ARRL in order to enjouy the ex cellent magazine QST. Come aboard, you'll really enjoy it N6WR ------------------------------ Date: Mon, 27 Dec 1993 13:18:36 GMT From: usc.edu!howland.reston.ans.net!darwin.sura.net!perot.mtsu.edu!raider!theporch!jackatak!root@network.ucsd.edu Subject: Ten-Tec 228 Tuner info ??? To: ham-ant@ucsd.edu jaevans@clark.net (John A. Evans) writes: > I am looking at a Ten-Tec Antenna Tuner model 228 at a local ham radio > shop on consignment but have found nothing in the rags (I have access to) > on the quality and usefulness of the unit for use with my Century 21 > transceiver. Perhaps part of the problem is that the unit may be mis-labeled... I have a Ten-Tec 229 tuner, and there is no marking on the front panel to indicate the model... > Any info on used price and experiences with the tuner are much > appreciated in advance. At any rate, the tuner I have, which I believe to be the same as what you are considering, is an excellent tuner of the "L-network" type. That is, the basic circuit is an "L" configuration: / in o-------uuuuu---------o out / |/ === /| | _____ ___ _ which can also be switched to allow the inductor to face the load for Lo Z systems... The construction is excellent, the rotary inductor tracks smoothly, and the tuner works very well with coax or with open-wire (ladder-line) feeds through the balun... It is rated at 2KW, but I have not used mine for more than 100 watts, because I haven't really had to... I'd say the 228/229 tuner would work quite well with your Century 21... assuming, of course, that you get the very fine manual with the tuner -- *READ* that very fine manual, and you will understand a great deal about the tuner circuit and how to use it properly. If it doesn't have one, email me and I'll make a copy and send it to you... 73, Jack, W4PPT/Mobile (1 QSL shy of 75M SSB WAS from the mobile -- and Santa didn't go through Vermont to get to Tennessee! ;-( ) +--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+ | Jack GF Hill |Voice: (615) 459-2636 - Ham Call: W4PPT | | P. O. Box 1685 |Modem: (615) 377-5980 - Bicycling and SCUBA Diving | | Brentwood, TN 37024|Fax: (615) 459-0038 - Life Member - ARRL | | root@jackatak.raider.net - "Plus ca changer, plus c'est la meme chose" | +--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--*--+ ------------------------------ Date: 27 Dec 1993 21:39:58 GMT From: yeshua.marcam.com!wrdis02.robins.af.mil!demarsee@uunet.uu.net Subject: Yagi Polarization Question To: ham-ant@ucsd.edu If you mount a yagi antenna neither vertically nor horizontally polarized, but diagonally (elements 45-degree angled from the ground), what would the gain be verses mounting it either vertically or horizontally? -3Db in both planes from it's rating in one plane? Or useless in both? The question arises since I'd like to have a directional antenna to use for both polarizations, and I only have a single yagi I can put up in a fixed direction (rotors aren't an option right now). Any suggestions on how I can put this one yagi to good use in a fixed position for both polarizations? Many Thanks & Regards, Darryl Marsee, KD4UMP demarsee@wrdis01.robins.af.mil LOGDIS Systems Administrator ------------------------------ End of Ham-Ant Digest V93 #155 ****************************** ******************************