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Date: Thu, 30 Jun 94 21:04:51 PDT From: Info-Hams Mailing List and Newsgroup <info-hams@ucsd.edu> Errors-To: Info-Hams-Errors@UCSD.Edu Reply-To: Info-Hams@UCSD.Edu Precedence: Bulk Subject: Info-Hams Digest V94 #726 To: Info-Hams Info-Hams Digest Thu, 30 Jun 94 Volume 94 : Issue 726 Today's Topics: Address for Wyle Electronics AEA IsoLoop - Opinion Automatic HF channel allocation Daily Summary of Solar Geophysical Activity for 29 June FIELD DAY 1994 REPORT help w/ yaesu pa-6 IPS Daily Report - 30 June 94 R/C model antenna orientation? Temp. Conversion Chart: F & C? Ten Tec PTO rebuild Unsubscribe Send Replies or notes for publication to: <Info-Hams@UCSD.Edu> Send subscription requests to: <Info-Hams-REQUEST@UCSD.Edu> Problems you can't solve otherwise to brian@ucsd.edu. Archives of past issues of the Info-Hams Digest are available (by FTP only) from UCSD.Edu in directory "mailarchives/info-hams". 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: 30 Jun 1994 21:46:34 GMT From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!gatech!swrinde!cs.utexas.edu!geraldo.cc.utexas.edu!ziggy.ph.utexas.edu!bsn@network.ucsd.edu Subject: Address for Wyle Electronics To: info-hams@ucsd.edu I would like the address and tel/fax no for Wyle Electronics. Thanks, Barry W5KH ------------------------------ Date: Thu, 30 Jun 1994 09:34:48 GMT From: swrinde!gatech!usenet.ins.cwru.edu!lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!lf.hp.com!apollo.hp.com!hpwin055.uksr!@@ihnp4.ucsd.edu Subject: AEA IsoLoop - Opinion To: info-hams@ucsd.edu Alan Bloom (alanb@hpnmarb.sr.hp.com) wrote: : The laws of physics show no such thing. It is theoretically possible : for a small loop to be 100% efficient. It's true that it's hard to : approach that ideal in practice, but the Isoloop comes impressively : close. A number of bad loops with lots of joints and sliding-contact capacitors have created a folklore that all capacitor-loaded small loops must be bad, very bad. It's famously difficult to overcome bad press. Given the differences between horizontal and vertical mounting, I think AEA shot themselves in the foot (or more vital area?) by filling the world with photos of their thing deployed horizontally. Quite a lot of people don't read but just look at the pictures :-) 100% efficiency can be approached, and the result on transmit is easily understood; all the watts you stuff up the cable get radiated. On receive, it is possible to get different levels of output from different 100% efficient, perfect, lossless antennae. The difference is in the effective capture area of different designs. The idea of antenna reciprocity is founded on a pathetic algebraic fudge by comparing to a half-wave dipole, and then sticking a frequency term into the standard equations for path attenuation. Path attenuation is not directly freq dependant, the term is a fix for the fact that at higher frequencies, half wave dipoles are smaller and have a smaller capture area, so collect less power from a given power flux density. I'd much rather see antenna effects assigned to the antenna, not the path. It makes a simple subject very confusing for beginners. Hobby horse done with. On RX smaller loops, still lossless, would yield smaller outputs, think of a range of 100% efficient solar cells, all of different sizes, operated side by side in the same lighting conditions. On the low bands, the fight is not to get enough signal, but to try to get less noise. Loops make rotatable low band antennae possible, to allow nulls to be oriented onto QRM sources to help reception. On high bands in small signal conditions, then a small antenna becomes a problem, given limits on Rx sensitivity. Someone with little space has little choice, and a loop is a prime candidate. Even so, it is worth their while to find out about how to pick an efficient one and how to orient it. Someone with plenty of space and big antennae can still benefit from some loop characteristics, it is an antenna worth having for RX when conditions get difficult with QRM, especially on LF. It takes an open mind and a willingness to risk being seen using something that looks embarassingly unimpressive. : As I said before, however, I am not a big Isoloop fan. I still think : $300 is a lot to pay for an antenna that performs almost as well as a : dipole. But for some situations, it might make sense. A crazy price to pay for something that can be built from junk, and it sugically removes the fun and educational dimensions. : That criticism might be valid for some antennas on the market (the : similarly-named "Isotron" is one that comes to mind), but the Isoloop : works as claimed and is a perfectly reasonable antenna to use. : AL N1AL I noticed that the chap who criticised the isoloop had no idea what the tuning box did. Would he accept the criticism of his favourite antenna by someone else who bought one, put it up (possibly oriented the least effective way) and had no idea of the tuning of element lengths ? I'd rather have a quad or beam than a high band loop, loops are not perfect, and not up to a good dipole, but are not as bad as some people suggest. They also have a couple of useful properties. I met that Maxcom dummy load resistor +whip thing at G3RJV's famous QRP vicarage Christmas party, with a room full of QRPers helpless with laughter. Some folk Do fool enough of the people enough of the time, I suppose. Cheers David GM4ZNX ------------------------------ Date: 1 Jul 1994 03:05:56 GMT From: ihnp4.ucsd.edu!munnari.oz.au!yarrina.connect.com.au!harbinger.cc.monash.edu.au!mdw074.cc.monash.edu.au!saisk1@network.ucsd.edu Subject: Automatic HF channel allocation To: info-hams@ucsd.edu Re: Automatic Allocation of HF radio channels ---------------------------------------------- As part of my final year Electrical Engineering thesis project at Monash University in Melbourne, Austrlia, I have undertaken to research into 'Self Tracking Automatic HF Optimisation of Voice and Data'. The project work is on behalf of Melbourne based company, BHP Petroleum that make great use of telecommunication equipment in remote locations both locally and overseas. The latest equipment I came across that handles automatic allocation of HF channels is the Automatic Link Establishment (ALE) 1045 controller. I managed to get a copy of a brochure on ALE 1045 detailing its possible arrangement in conjunction with a PC, high speed data modem and an HF radio. Having also read through the US Federal Standards 1045 on ALE titled 'Telecommunications: Radio Automatic Link Establishment', I would greatly appreciate further information on ALE or relevant equipment and about the possibility of transmitting voice as well as data using this system. Could someone please clarify the following points: AA) Is it viable to digitize and compress voice before transmitting it as data blocks but switching off the 'retransmission' mode to prevent echoes? What type of Codec might be suitable for voice digitisation? BB) Can an ALE system be used to allocate the optimum HF channel at regular intervals and switch over to normal analog voice communication? Any references to literature or technical articles would also be much appreciated. Thanking in advance, Shiraz Iskenderian, Monash University. saisk1@ccds.cc.monash.edu.au ------------------------------ Date: Wed, 29 Jun 1994 22:08:13 MDT From: ihnp4.ucsd.edu!library.ucla.edu!news.mic.ucla.edu!unixg.ubc.ca!quartz.ucs.ualberta.ca!alberta!ve6mgs!usenet@network.ucsd.edu Subject: Daily Summary of Solar Geophysical Activity for 29 June To: info-hams@ucsd.edu /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY 29 JUNE, 1994 /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ (Based In-Part On SESC Observational Data) SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 29 JUNE, 1994 -------------------------------------------------------- !!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 180, 06/29/94 10.7 FLUX=079 90-AVG=079 SSN=032 BKI=3543 2333 BAI=019 BGND-XRAY=A4.4 FLU1=1.1E+06 FLU10=1.4E+04 PKI=4543 3344 PAI=021 BOU-DEV=036,107,047,027,018,026,028,032 DEV-AVG=040 NT SWF=00:000 XRAY-MAX= C1.2 @ 2148UT XRAY-MIN= A4.0 @ 1140UT XRAY-AVG= B1.1 NEUTN-MAX= +002% @ 2135UT NEUTN-MIN= -002% @ 0120UT NEUTN-AVG= +0.2% PCA-MAX= +0.1DB @ 2150UT PCA-MIN= -0.1DB @ 2125UT PCA-AVG= +0.0DB BOUTF-MAX=55322NT @ 0330UT BOUTF-MIN=55297NT @ 2150UT BOUTF-AVG=55312NT GOES7-MAX=P:+000NT@ 0000UT GOES7-MIN=N:+000NT@ 0000UT G7-AVG=+066,+000,+000 GOES6-MAX=P:+136NT@ 2103UT GOES6-MIN=N:-072NT@ 0324UT G6-AVG=+093,+037,-031 FLUXFCST=STD:080,080,080;SESC:080,080,080 BAI/PAI-FCST=020,020,020/020,020,020 KFCST=4454 3323 4454 3223 27DAY-AP=019,019 27DAY-KP=4444 3333 4433 3334 WARNINGS= ALERTS= !!END-DATA!! NOTE: The Effective Sunspot Number for 28 JUN 94 was 30.1. The Full Kp Indices for 28 JUN 94 are: 4- 2- 2- 3- 3- 3o 3o 5- The 3-Hr Ap Indices for 28 JUN 94 are: 21 7 6 14 11 15 15 37 Greater than 2 MeV Electron Fluence for 29 JUN is: 4.3E+07 SYNOPSIS OF ACTIVITY -------------------- Solar activity was very low. However, flare frequency increased over the last 24 hours. Region 7742 (S09E42) produced occasional small subflares, the largest a B9/0F at 1445Z. A weak delta remains in the leader spots. The other spotted region visible, Region 7743 (S10E54), was quiet. Other activity of interest included an eruptive prominence from N10E90 at approximately 1335Z. Solar activity forecast: solar activity is expected to be very low. Region 7742 may generate an isolated C-class event should further development occur. The geomagnetic field varied from quiet to minor storm levels. Local nighttimes had the most disturbed periods. The greater than 2 MeV electron flux was at moderate to high levels. Geophysical activity forecast: the geomagnetic field is expected to be generally active, with nighttime substorms persisting through the interval. Event probabilities 30 jun-02 jul Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green Geomagnetic activity probabilities 30 jun-02 jul A. Middle Latitudes Active 40/40/40 Minor Storm 30/30/30 Major-Severe Storm 10/10/10 B. High Latitudes Active 30/30/30 Minor Storm 40/40/40 Major-Severe Storm 20/20/20 HF propagation conditions were normal over the low and middle latitudes. High and polar latitudes were also mostly near-normal, although night-sector substorming produced occassional minor signal degradation during the local night time. Similar conditions are expected for the next 72 hours. COPIES OF JOINT USAF/NOAA SESC SOLAR GEOPHYSICAL REPORTS ======================================================== REGIONS WITH SUNSPOTS. LOCATIONS VALID AT 29/2400Z JUNE ------------------------------------------------------- NMBR LOCATION LO AREA Z LL NN MAG TYPE 7742 S09E42 229 0180 DAO 05 011 BETA-DELTA 7743 S10E54 217 0030 HRX 01 001 ALPHA 7737 S11W87 358 PLAGE 7741 N05W63 334 PLAGE REGIONS DUE TO RETURN 30 JUNE TO 02 JULY NMBR LAT LO 7733 N05 170 7734 N11 151 LISTING OF SOLAR ENERGETIC EVENTS FOR 29 JUNE, 1994 --------------------------------------------------- A. ENERGETIC EVENTS: BEGIN MAX END RGN LOC XRAY OP 245MHZ 10CM SWEEP NONE POSSIBLE CORONAL MASS EJECTION EVENTS FOR 29 JUNE, 1994 ------------------------------------------------------- BEGIN MAX END LOCATION TYPE SIZE DUR II IV 29/B1335 1427 N10E90 EPL 29/ 2000 B2032 S17W04 DSF INFERRED CORONAL HOLES. LOCATIONS VALID AT 29/2400Z --------------------------------------------------- ISOLATED HOLES AND POLAR EXTENSIONS EAST SOUTH WEST NORTH CAR TYPE POL AREA OBSN 89 S19E46 S27E39 S08E16 N08E44 238 ISO POS 009 10830A SUMMARY OF FLARE EVENTS FOR THE PREVIOUS UTC DAY ------------------------------------------------ Date Begin Max End Xray Op Region Locn 2695 MHz 8800 MHz 15.4 GHz ------ ---- ---- ---- ---- -- ------ ------ --------- --------- --------- 28 Jun: 1127 1134 1141 B1.6 1335 1343 1351 B1.6 2017 2020 2022 B1.1 REGION FLARE STATISTICS FOR THE PREVIOUS UTC DAY ------------------------------------------------ C M X S 1 2 3 4 Total (%) -- -- -- -- -- -- -- -- --- ------ Uncorrellated: 0 0 0 0 0 0 0 0 003 (100.0) Total Events: 003 optical and x-ray. EVENTS WITH SWEEPS AND/OR OPTICAL PHENOMENA FOR THE LAST UTC DAY ---------------------------------------------------------------- Date Begin Max End Xray Op Region Locn Sweeps/Optical Observations ------ ---- ---- ---- ---- -- ------ ------ --------------------------- 28 Jun: 1335 1343 1351 B1.6 III NOTES: All times are in Universal Time (UT). Characters preceding begin, max, and end times are defined as: B = Before, U = Uncertain, A = After. All times associated with x-ray flares (ex. flares which produce associated x-ray bursts) refer to the begin, max, and end times of the x-rays. Flares which are not associated with x-ray signatures use the optical observations to determine the begin, max, and end times. Acronyms used to identify sweeps and optical phenomena include: II = Type II Sweep Frequency Event III = Type III Sweep IV = Type IV Sweep V = Type V Sweep Continuum = Continuum Radio Event Loop = Loop Prominence System, Spray = Limb Spray, Surge = Bright Limb Surge, EPL = Eruptive Prominence on the Limb. ** End of Daily Report ** ------------------------------ Date: 30 Jun 1994 22:08:01 GMT From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!gatech!news-feed-1.peachnet.edu!news.duke.edu!godot.cc.duq.edu!newsfeed.pitt.edu!dsinc!netnews.upenn.edu!netnews.upenn.edu!yee@network.ucsd.edu Subject: FIELD DAY 1994 REPORT To: info-hams@ucsd.edu I went with a local club which ran a 9A station. Had a ball but learned a big lesson. DO NOT bring your girlfriend with you. I had to leave early since she got bored. C'est la vie. -- Medical Image Processing Group | 73 de Conway Yee, N2JWQ 411 Blockley Hall | EMAIL : yee@mipg.upenn.edu 423 Guardian Drive | TELEPHONE : 1 (215) 662-6780 Philadelphia, PA 19104-6021 (USA) | FAX : 1 (215) 898-9145 ------------------------------ Date: 1 Jul 1994 01:05:45 GMT From: ihnp4.ucsd.edu!dog.ee.lbl.gov!agate!spool.mu.edu!nigel.msen.com!heifetz.msen.com!koechig@network.ucsd.edu Subject: help w/ yaesu pa-6 To: info-hams@ucsd.edu I have the Yaesu PA-6 dc car adapter which worked fine when new but has recently developed a problem. When plugged into the source and not under load it has the required voltage present but under load it dies. I suspect it to be the voltage regulator inside but I'm not positive. How do I check the regulator and if it is the regulator, can I use any comparable regulator with no problem? Thanks, Bill Koechig, N8PKA Pontiac, MI ------------------------------ Date: Thu, 30 Jun 1994 23:34:55 GMT From: swrinde!gatech!newsxfer.itd.umich.edu!zip.eecs.umich.edu!umn.edu!zib-berlin.de!zrz.TU-Berlin.DE!netmbx.de!Germany.EU.net!EU.net!sunic!trane.uninett.no!ifi.uio.no!wabbit.@ihnp4.ucsd.edu Subject: IPS Daily Report - 30 June 94 To: info-hams@ucsd.edu SUBJ: IPS DAILY SOLAR AND GEOPHYSICAL REPORT ISSUED AT 30/2330Z JUNE 1994 BY IPS RADIO AND SPACE SERVICES FROM THE REGIONAL WARNING CENTRE (RWC), SYDNEY. SUMMARY FOR 30 JUNE AND FORECAST UP TO 3 JULY IPS Disturbance Warning 17 was issued on 22 June and is current for interval 24 June to 4 July ----------------------------------------------------------- 1A. SOLAR SUMMARY Activity: low Flares Max Fadeout Begin End Freq. Sectors M2/-- 2124UT possible lower East Pacific/ North American Observed 10.7 cm flux/Equivalent Sunspot Number : 083/024 GOES satellite data for 29 June Daily Proton Fluence >1 MeV: 1.1E+06 Daily Proton Fluence >10 MeV: 1.4E+04 Daily Electron Fluence >2 MeV: 4.3E+07 X-ray background: A4.4 Fluence (flux accumulation over 24hrs)/ cm2-ster-day. 1B. SOLAR FORECAST 01 July 02 July 03 July Activity Low Low Low Fadeouts None expected None expected None expected Forecast 10.7 cm flux/Equivalent Sunspot Number : 085/027 1C. SOLAR COMMENT Rgn 7742 produced the M2 flare. It has exhibited moderate growth in recent days, but is not currently expected to produce further significant activity. ----------------------------------------------------------- 2A. MAGNETIC SUMMARY Geomagnetic field at Learmonth: unsettled to active Estimated Indices : A K Observed A Index 29 June Learmonth 19 4434 3333 Fredericksburg 16 22 Planetary 18 21 Observed Kp for 29 June: 4543 3344 2B. MAGNETIC FORECAST DATE Ap CONDITIONS 01 Jul 20 Unsettled to active. 02 Jul 20 Unsettled to active. 03 Jul 20 Unsettled to active. 2C. MAGNETIC COMMENT None. ----------------------------------------------------------- 3A. GLOBAL HF PROPAGATION SUMMARY LATITUDE BAND DATE LOW MIDDLE HIGH 30 Jun normal fair-normal poor-fair PCA Event : None. 3B. GLOBAL HF PROPAGATION FORECAST LATITUDE BAND DATE LOW MIDDLE HIGH 01 Jul normal fair-normal poor-fair 02 Jul normal fair-normal poor-fair 03 Jul normal fair-normal poor-fair 3C. GLOBAL HF PROPAGATION COMMENT Continuing geomagnetic activity may degrade propagation conditions at mid and high lats. ----------------------------------------------------------- 4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY MUFs at Sydney were near predicted monthly values Observed T index for 30 June: 28 Predicted Monthly T Index for June is 30. 4B. AUSTRALIAN REGION IONOSPHERIC FORECAST DATE T-index MUFs 01 Jul 25 Near predicted monthly values. 02 Jul 20 Near predicted monthly values. 03 Jul 25 Near predicted monthly values. 4C. AUSTRALIAN REGION COMMENT Regular Sporadic E layer and occasional Spread F may have degraded local propagations conditions yesterday. Similar conditions are expected for today. -- IPS Regional Warning Centre, Sydney |IPS Radio and Space Services email: rwc@ips.oz.au fax: +61 2 4148331 |PO Box 5606 RWC Duty Forecaster tel: +61 2 4148329 |West Chatswood NSW 2057 Recorded Message tel: +61 2 4148330 |AUSTRALIA ------------------------------ Date: 1 Jul 1994 00:29:53 GMT From: ihnp4.ucsd.edu!agate!dls@network.ucsd.edu Subject: R/C model antenna orientation? To: info-hams@ucsd.edu I wonder if any interested ham operators can help me with an antenna question. I am not a ham myself, but sing the praises of you guys all the time, and find myself now with a question that I need help with. I fly radio controlled model gliders, using one of the assigned channels in the 72 MHz band. The typical receiver for these model aircraft has an antenna consisting of about a 40" length of slender flexible wire extending out the rear of the receiver case, which itself is usually mounted near the front of the glider fuselage. It has been my habit to extend this antenna rearward through the aircraft fuselage and out the back, such that when the model is airborne, the airstream tends to extend the hanging portion of the antenna and it appears to the environment like a horizontally oriented item. For cosmetic reasons, i.e., so as not to have unsightly wire hanging out the rear of the model, I am tempted to loop the antenna back on itself inside the fuselage. If I extend the antenna through the fuselage, and then loop it 180 degrees back towards the front, am I creating a situation whereby the received signals on the two antenna halves are effectively cancelled out (exactly out of phase), leading to zero received signal? Please see the crude diagram below. The spacing between the looped antenna halves would be about 1", which is such a small fraction of the ~ 164" wavelength, that it makes me think that doubling the antenna back on itself this way might lead to total cancellation of signal. But, knowing very little about RF, I would like to learn from others here. /------ / | | / | | / | | / | | / | | Glider fuselage / | | / | | / | | / | | /---------------------------------------------------------------| / .__. Antenna | / R | |-------------------------------------------------- | / X | | | | / |__| ---------------------------------------------- | / | /_______________________________________________________________| ^ | | | | | Transmitted signal | | | o | | | | .------. | TX | |______| Thanks to any and all who can help me see the wisdom of doing this (or not). I really can't afford to experiment with the craft in the air, and I would like to be more firmly grounded in the theory of what might be occurring. In other words, I wanted to be the only "grounded" item here, and I want my glider soaring gracefully above me. ------------------------------ Date: 30 Jun 1994 22:05:38 GMT From: ihnp4.ucsd.edu!swrinde!gatech!newsxfer.itd.umich.edu!jobone!lynx.unm.edu!cybele.unm.edu!chariya@network.ucsd.edu Subject: Temp. Conversion Chart: F & C? To: info-hams@ucsd.edu In article <199406301318.GAA23064@ucsd.edu> William=E.=Newkirk%Pubs%GenAv.Mlb@ns14.cca.CR.rockwell.COM writes: >geez, people make this so complicated. > >C = 1.8 (F-32). > Oops ! A missprint. It should read C = (F - 32)/1.8. ------------------------------ Date: 1 Jul 94 03:31:33 GMT From: ihnp4.ucsd.edu!usc!nic-nac.CSU.net!csulb.edu!paris.ics.uci.edu!ucivax!gateway@network.ucsd.edu Subject: Ten Tec PTO rebuild To: info-hams@ucsd.edu Anyone out there know how to nicely adjust and "loosen" the action on the Ten Tec PTO (from Corsair, etc....). I just rebuilt mine, and the old problem is gone, but I continue to have awful backlash and would like a looser action. Any suggestions? I have added one extra washer (total 3 on each side) to the cup screws in the back. Clark WA3JPG ------------------------------ Date: 29 Jun 94 19:21:36 GMT From: news-mail-gateway@ucsd.edu Subject: Unsubscribe To: info-hams@ucsd.edu Please unsubscribe me from the amateur news service but please continue to send the orbital elenments. The ANS bullitins were being duplicated on our mail server and I didn't want to hog a lot of time. Thanks. Don, N2CZL. ------------------------------ Date: 30 Jun 1994 22:15:06 GMT From: ihnp4.ucsd.edu!swrinde!gatech!usenet.ins.cwru.edu!lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!col.hp.com!fc.hp.com!paulc@network.ucsd.edu To: info-hams@ucsd.edu References <1994Jun28.112050.7455@powertech.no>, <1994Jun29.201232.12156@auc.trw.com>, <Cs7B2n.58L@isltd.insignia.com>u Subject : Re: simnplex on two meter I think "CQ from KG0CZ" is a GREAT idea, much more to the point than the backhanded, too-subtle, "KG0CZ monitoring" call *if you are wanting to strike up a conversation*. Unfortunately, that's not the prevailing style here in CO. So, we need a leader to lead us into new and better operating habits. Who'll be the first to risk embarassment and shame and call CQ on the repeater (not the long-winded form, just the above form)?? I still agree (maybe it's inconsistent) with keeping Q signal use to a minimum on VHF. -Paul C. KG0CZ ------------------------------ End of Info-Hams Digest V94 #726 ******************************