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Date: Sun, 30 Jan 94 08:38:50 PST 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 #91 To: Info-Hams Info-Hams Digest Sun, 30 Jan 94 Volume 94 : Issue 91 Today's Topics: ARRL DX Bulletin #7 - January 27, 1994 CW filters and DSP-9 CW filters and DSP-9 - morse1.jpg Daily Summary of Solar Geophysical Activity for 27 January FCC: Whats taking so long???? Frequencies for Animal Tracking ? Got a callbook handy? ham stuff htx-202 or dj-162 ? RAMSEY FX TRANSCEIVER Sideband Technology Inc. TF3CW QSL address Your experiences on 40 meter CW QRP 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: Fri, 28 Jan 1994 15:03:43 MST From: library.ucla.edu!europa.eng.gtefsd.com!news.umbc.edu!eff!news.kei.com!yeshua.marcam.com!zip.eecs.umich.edu!destroyer!nntp.cs.ubc.ca!alberta!ve6mgs!usenet@network.ucsd.edu Subject: ARRL DX Bulletin #7 - January 27, 1994 To: info-hams@ucsd.edu ZCZC AE05 QST de W1AW DX Bulletin 7 ARLD007 >From ARRL Headquarters Newington CT January 27, 1994 To all radio amateurs SB DX ARL ARLD007 ARLD007 DX news The items in this week's bulletin are courtesy of Bob, W5KNE; QRZ DX; Karl, PS7KM; Dennis, WB0WAO; Tedd, KB8NW; the Ohio/Penn and Yankee Clipper Contest Club PacketCluster networks. Thanks. PENGUIN ISLANDS LAST STAND? Ian, ZS9A, reports that Baldur, DJ6SI, is attempting to activate ZS0 around February 24. And there are rumblings that the Republic of South Africa may turn over both Walvis Bay and Penguin Islands to Namibia at the end of February. NETHERLANDS ANT PJ2/OH1VR through February 2. Seppo is likely to be active in the CQ WW 160 Meter CW Contest. BANGLADESH. Eric, S21ZG, is on nearly every day between 3651 and 3653 kHz from 1145 to 1215z and 0000z. EGYPT. Listen for SU2MT on 3793 kHz at 0500z. CAYMAN ISLANDS. Vern, W8BLA, and Dick, K2UFT, are active on CW as ZF1CQ. They will be there until January 31 and plan to operate in the 160 Meter Contest. QSL via W8BLA. SAINT LUCIA. Scott N9JCL, hopes to sign J6/N9JCL from January 28 to February 2. Check 3795 Khz SSB or 3510 kHz CW at 0900z; 7003 kHz CW at 1000z; and 14195 kHz SSB at 1200z. OGASAWARA ISLANDS. Here's a DX-first. JA1LSY/JD1 will be operating 20 meter SST FIJI. Shinji, JI3ACL, will sign 3D2CL on 40 through 10 meter CW and SSB February 10 to 16. QSL via JI3ACL. CQ WW 160 MET W3HNK. VR2MH will be OH2BH/VR2BH and OH1NYP. FRENCH POLYNESIA. Walter, DJ0FX, will work CW and SSB as FO0PT through February 19. This will be an all-band effort. ANTIGUA. John, AA2LW, is here on business, but operates 40 through 10 meter SSB as time allows. His favorite band is 17 meters. SAINT CHRISTOPHER. Mike, W9NSZ, will sign V47NS on Nevis Island from January 28 to February 2. ANGUILLA. KK3K, WB6LYI, KC6XC, KI4ZN, W9BVD, KF7IK, AF9A and AI9Q are planning a serious effort for March 5 through 10. They hope to run all band all mode HF, and will be on OSCAR 13 Mode B and S. TURKS AND CAICOS ISLANDS. K2TD, N2VW and WB2YOF should be active through early February signing /VP5. MEXICO. Rick, NE8Z, will operate from Puerto Vallarta as XE1/NE8Z February 13 to 20 on all bands. He will be active in the ARRL CW DX Contest. QSL via K8LJG. ANTARCTICA. Brian, VP8CFM, is Base Commander at the British Antarctic Survey Base. His duty tour is for 14 months and he will be active as either VP8HAL or his own call. QSL via GM4KLO. SAINT PET approximately two weeks, starting about February 2. Plans are to operate all HF bands plus OSCARs 10, 13 and 21. Satellite operator tips are 145.890 MHz CW on OSCAR 10 and 145.925 MHz on OSCAR 13. QSL PY0SK via PS7KM. QSL PY0SP via PT7AA. NNNN -- James J. Reisert Internet: reisert@wrksys.enet.dec.com Digital Equipment Corp. UUCP: ...decwrl!wrksys.enet.dec.com!reisert 146 Main Street - MLO3-6/C9 Voice: 508-493-5747 Maynard, MA 01754 FAX: 508-493-0395 ------------------------------ Date: 27 Jan 1994 18:22:30 GMT From: nntp.ucsb.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!cs.utexas.edu!swrinde!sgiblab!sgigate.sgi.com!olivea!news.bbn.com!news!levin@network.ucsd.edu Subject: CW filters and DSP-9 To: info-hams@ucsd.edu In article <2i3fsu$7lh@news.acns.nwu.edu> rdewan@casbah.acns.nwu.edu (Rajiv Dewan) writes: If we broaden the definition of ringing to allow for noisy signals, of the kind encountered on the low HF bands such as 80m, then there might be more than one source of ringing: . . . 2. Progressive coloration of background white noise as the filter bandwidth is narrowed. . . . You've nailed the head on the hit as far as I'm concerned, especially on the low bands. As I narrow the digital filter (the built-in audio filter on the Yaesu 990) to eliminate QRM the noise acquires a pitch which obscures the tone I'm trying to distinguish. If only there were some way (maybe there is! I'm no expert with using the RF gain control, for instance) to desensitize the receiver to the noise without desensitizing it to the weak CW signal. /JBL = Nets: levin@bbn.com | "GO TO JAIL. Go directly to jail. Do not pass POTS: (617)873-3463 | Go. Do not collect $200." KD1ON (@KB4N.NH.USA) | -- Parker Brothers ------------------------------ Date: Sat, 29 Jan 1994 03:19:52 GMT From: library.ucla.edu!agate!howland.reston.ans.net!usc!elroy.jpl.nasa.gov!newncar!destroyer!nntp.cs.ubc.ca!alberta!ve6mgs!mark@network.ucsd.edu Subject: CW filters and DSP-9 - morse1.jpg To: info-hams@ucsd.edu me@next45.wsi.physik.tu-muenchen.de (Matthias Rosenberger) writes: >According to the CW fiter discussion, I want to >supply some calcualtions shown in two pictures in following postings >based on a Fourier analysis of a morse signal of 10 times 'e': >00000101010101010101010100000 Back to the drawing board, Matthias, 10 `e's is: 0001000100010001000100010001000100010001000 Enjoy, Ciao -- Mark ------------------------------ Date: Thu, 27 Jan 1994 21:27:57 MST From: agate!howland.reston.ans.net!sol.ctr.columbia.edu!destroyer!nntp.cs.ubc.ca!alberta!ve6mgs!usenet@network.ucsd.edu Subject: Daily Summary of Solar Geophysical Activity for 27 January To: info-hams@ucsd.edu /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ DAILY SUMMARY OF SOLAR GEOPHYSICAL ACT 27 JANUARY, 1994 /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ (Based In-Part On SESC Observational Data) SOLAR AND GEOPHYSICAL ACT ----------------------------------------------------------- !!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 027, 01/27/94 10.7 FLUX=120.5 90-AVG=105 SSN=063 BKI=2443 3433 BAI=018 BGND-XRAY=B3.6 FLU1=9.9E+05 FLU10=9.8E+03 PKI=2343 3433 PAI=016 BOU-DEV=000,042,061,025,034,044,021,028 DEV-AVG=031 NT SWF=01:027 XRAY-MAX= M2.7 @ 0510UT XRAY-MIN= B3.3 @ 1245UT XRAY-AVG= C1.2 NEUTN-MAX= +002% @ 1505UT NEUTN-MIN= -003% @ 1135UT NEUTN-AVG= -0.2% PCA-MAX= +0.1DB @ 2215UT PCA-MIN= -0.4DB @ 1915UT PCA-AVG= -0.0DB BOUTF-MAX=55349NT @ 1402UT BOUTF-MIN=55319NT @ 1853UT BOUTF-AVG=55335NT GOES7-MAX=P:+000NT@ 0000UT GOES7-MIN=N:+000NT@ 0000UT G7-AVG=+062,+000,+000 GOES6-MAX=P:+136NT@ 1553UT GOES6-MIN=N:-087NT@ 0706UT G6-AVG=+083,+030,-029 FLUXFCST=STD:120,115,110;SESC:120,115,110 BAI/PAI-FCST=015,010,015/018,010,015 KFCST=3333 4433 2223 3322 27DAY-AP=018,022 27DAY-KP=1355 3322 3345 4322 WARNINGS=*SWF ALERTS=**SWEEP:II=2@0401-0420UTC !!END-DATA!! NOTE: The Effective Sunspot Number for 26 JAN 94 was 56.0. The Full Kp Indices for 26 JAN 94 are: 1+ 3o 5- 3- 4- 4- 3o 2+ SYNOPSIS OF ACT -------------------- Solar activity was at moderate levels. A M2/1B flare erupted from Region 7654 (N07W78) at 0510UT. An unassociated Type II radio emission was detected at 0401UT. Solar activity forecast: solar activity is expected to be at low to moderate levels until Regions 7654 and 7658 (N11W53) depart the disk. The geomagnetic field has been at quiet to active levels for the past 24 hours. Geophysical activity forecast: the geomagnetic field is expected to be at active levels through the remainder of the 27 January. Quiet to unsettled levels are expected for the remainder of the forecast period. Event probabilities 28 jan-30 jan Class M 45/45/45 Class X 01/01/01 Proton 01/01/01 PCAF Green Geomagnetic activity probabilities 28 jan-30 jan A. Middle Latitudes Active 20/10/20 Minor Storm 10/05/10 Major-Severe Storm 01/01/01 B. High Latitudes Active 20/10/20 Minor Storm 10/05/10 Major-Severe Storm 01/01/01 HF propagation conditions were normal over the low and middle latitudes. High and polar latitudes saw occasional minor signal degradation during the local night hours due. Near-normal propagation is expected over all regions during the next 72 hours, particularly for the low and middle latitude paths. High and polar latitudes should see gradual improvements as well. Brief SWF activity is still expected at times over daylit circuits during minor solar flare activity. COPIES OF JOINT USAF/NOAA SESC SOLAR GEOPHYSICAL REPORTS ======================================================== REGIONS WIT ---------------------------------------------------------- NMBR LOCATION LO AREA Z LL NN MAG TYPE 7652 N04W93 224 0040 HSX 02 002 ALPHA 7654 N09W78 209 0490 DKI 07 006 BET 7658 N12W53 184 0130 DAO 09 009 BET 7661 N08W02 133 0070 DAO 04 006 BET 7659 S12W14 145 PLAGE 7660 S09E16 115 PLAGE REGIONS DUE TO RET NMBR LAT 7648 N07 024 7650 N05 012 7653 S05 011 LISTING OF SOLAR ENERGETIC EVENTS FOR 27 JANUARY, 1994 ------------------------------------------------------ BEGIN MAX END RGN LOC XRAY OP 245MHZ 10CM SWEEP 0341 0358 0409 7654 N08W68 C4.6 1N II 0456 0510 0531 7654 N11W65 M2.7 1B 51 POSSIBLE CORONAL MASS EJECTION EVENTS FOR 27 JANUARY, 1994 ---------------------------------------------------------- BEGIN MAX END LOCATION TYPE SIZE DUR II IV 27/ 0401 0420 N08W68 RSP C4.6 28 2 27/ 0840 0932 1003 LDE C1.3 83 INFERRED CORONAL HOLES. LOCATIONS VALID AT 27/2400Z --------------------------------------------------- ISOLATED HOLES AND POLAR EXT EAST SOUTH WEST NORTH CAR TYPE POL AREA OBSN 58 N18W35 S20W53 S12W65 N30W43 188 ISO NEG 021 10830A 59 N56W03 N30W18 N68W43 N68W43 164 EXT 60 S05E32 S10E25 S10E25 N18E29 111 ISO NEG 002 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 ------ ---- ---- ---- ---- -- ------ ------ --------- --------- --------- 26 Jan: 0019 0028 0033 C1.0 0054 0058 0103 C1.1 0107 0118 0124 C2.5 SF 7654 N07W50 0129 0136 0141 M1.5 1B 7654 N08W51 60 130 38 0150 0200 0208 C6.5 SF 7654 N07W50 0244 0247 0249 C1.0 0538 0541 0543 C1.4 SF 7654 N08W56 190 320 0611 0651 0657 C1.8 SF 7654 N07W56 0726 0733 0741 C1.3 62 25 0936 0939 0941 B7.3 1005 1011 1016 C1.0 1119 1142 1150 C4.6 1350 1359 1402 B5.9 SF 7658 N09W34 1552 1619 1624 C2.5 SF 7654 N10W61 1606 1607 1620 SF 7658 N11W35 1630 1633 1636 C1.9 1639 1642 1645 C3.7 1716 1721 1726 C1.3 SF 7654 N08W60 1849 1852 1854 C1.5 SF 7654 N09W62 2020 2025 2030 C1.0 2054 2058 2100 B7.2 SF 7654 N08W62 2117 2120 2122 B8.7 SF 7654 N09W63 2132 2137 2140 B8.6 2146 2146 2156 SF 7654 N09W64 2227 2237 2241 C1.6 SF 7654 N10W68 REGION FLARE STATISTICS FOR THE PREVIOUS UTC DAY ------------------------------------------------ C M X S 1 2 3 4 Total (%) -- -- -- -- -- -- -- -- --- ------ Region 7654: 8 1 0 11 1 0 0 0 012 (48.0) Region 7658: 0 0 0 2 0 0 0 0 002 ( 8.0) Uncorrellated: 9 0 0 0 0 0 0 0 011 (44.0) Total Events: 025 optical and x-ray. EVENTS WIT ---------------------------------------------------------------- Date Begin Max End Xray Op Region Locn Sweeps/Optical Observations ------ ---- ---- ---- ---- -- ------ ------ --------------------------- 26 Jan: 0019 0028 0033 C1.0 III 0611 0651 0657 C1.8 SF 7654 N07W56 III 1552 1619 1624 C2.5 SF 7654 N10W61 III 1716 1721 1726 C1.3 SF 7654 N08W60 V 2117 2120 2122 B8.7 SF 7654 N09W63 III 2227 2237 2241 C1.6 SF 7654 N10W68 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: Thu, 27 Jan 1994 18:28:50 GMT From: world!cravit@uunet.uu.net Subject: FCC: Whats taking so long???? To: info-hams@ucsd.edu In article <2i8ptc$27g@charm.magnus.acs.ohio-state.edu>, William VanHorne <wvhorn@magnus.acs.ohio-state.edu> wrote: >passed. Secondly, my license (Gen.) took 10 weeks and 5 days to arrive >back in December. My Technician license took 10 weeks and 3 days to arrive (I got it 2 weeks ago). >Patience. Concurred. It will come _eventually_. If it does not come within 90 days after the test date, call the ARRL VEC before you call the FCC. They can verify when the FCC received the paperwork, and may advise you to wait to call the FCC. /Matthew N9VWG -- Matthew Cravit, N9VWG | All opinions expressed here are Michigan State University | my own. I don't speak for The World, East Lansing, MI 48825 | and they don't speak for me (luckily E-Mail: cravit@world.std.com | for both of us). ------------------------------ Date: 28 Jan 94 18:45:40 GMT+12 From: ucsnews!sol.ctr.columbia.edu!howland.reston.ans.net!wupost!waikato!comp.vuw.ac.nz!gcs.co.nz!amigans!home.amigans.gen.nz!halvey@network.ucsd.edu Subject: Frequencies for Animal Tracking ? To: info-hams@ucsd.edu -- Does anyone out there happen to have a list of the bands used for tracking animals fitted with radio collars. Preferably in New Zealand, but other locations would also be of interest. Thanks in advance. -- Dave Halverson, Wanganui N.Z. halvey@home.amigans.gen.nz ------------------------------ Date: 29 Jan 94 14:49:55 GMT From: ogicse!qiclab!egreen!sitka.wednet.edu!connected.com!connected.com!jgates@network.ucsd.edu Subject: Got a callbook handy? To: info-hams@ucsd.edu searanch@netcom.com (Robert C. Diefenbach) writes: >I'm trying to locate an old pal, Barry Milburg, WD4DAA. He moved >from Atlanta to New Jersey in 1988, and may have changed his call. >But if someone would take a peek at a current call book and let >me have a mailing address (assuming he didn't change his call), >I'd appreciate it. Many thanks. >73 >Rob Diefenbach >WD4NEK 28 greenwood dr, millburn nj, 07041 -- John Gates, N7BTI, Edmonds, WA 206 774-3777 jgates@hebron.connected.com CIS 72106,367 ------------------------------ Date: 30 Jan 94 15:50:18 GMT From: news-mail-gateway@ucsd.edu Subject: ham stuff To: info-hams@ucsd.edu interested in following your email service. I am a ham of 20 years, (still under 40!!) with variable interests throughtout the mode and frequency spectrum Rick ve6gk. ------------------------------ Date: Thu, 27 Jan 1994 16:53:18 GMT From: nntp.ucsb.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!apollo.hp.com!hpwin052!hpqmoea!dstock@network.ucsd.edu Subject: htx-202 or dj-162 ? To: info-hams@ucsd.edu Jerry Sy (ah301@yfn.ysu.edu) wrote: : currently, I am leaning towards the dj-162 because of its wide : receive. : jerry Wide receive is literal for all this class of radio, they tend to be very prove to losing the ability to hear an Amateur band signal when there are strong out-of band signals about. The only cure is having tight filtering around the amateur band, and this precludes wide range reception. You'll not be far wrong if you think of them as a box containing 3 things: 1) a "scanner" with performance that places it at the cheap end of the scanner market, and less frequency coverage than usual. 2) A reasonable quality amateur band transmitter. 3) An amateur band receiver with only the performance of a cheap scanner, that is very susceptible to strong unwanted signals. There are many people who have these and are delighted with them. Possibly due to being in areas away from non-amateur transmitters, or perhaps because they don't know what they've missed because they never heard it.... The Tandy hand-held may now be the only amateur hand-held that has not seriously compromised its performance as an amateur band radio. I understand that some hand-helds now have computer game modes. Could they have been included to give the user something to do while in areas where blocking is frequent? Ok, I've got strong opinions in this area, but if scanning was your prime interest, you probably wouldn't have got a licence. If you can't hear 'em, you can't work 'em. whoever said it first is probably long dead, but it is still true. Also don't you just always lose contact just at a critical point in a talk-in etc. Cheers David ------------------------------ Date: 28 Jan 94 17:17:43 GMT From: ogicse!psgrain!research-01.mskcc.org!psinntp!psinntp!arrl.org!ehare@network.ucsd.edu Subject: RAMSEY FX TRANSCEIVER To: info-hams@ucsd.edu Greg Bullough (greg@netcom.com) wrote: : Steven has hit it on the head. As hams, we have for years said "can't : afford a commercial rig? Home-brew or build a simple kit." Then : QST and all the other magazines which bang this drum (which quite : handily fills up magazine pages with circuits that few ever : build) reap big advertising dollars from kit companies. Greg, For starters, I am not sure that few ever build projects from magazines. Some of the authors that have offered a kit have reported large sales -- to say nothing of those that either homebrew it without a kit, or at least use part of the circuit as they build something else. Go to any hamfest, note the rows upon rows of vendors offering components. Hams are buying them, putting them in bags and taking them home. They must be doing something with the parts. Even if hams don't actually build very many projects, they sure seem to enjoy reading (or thinking ) about building them! All of the ham and electronics magazines offer construction articles. I don't think I would characterize printing articles that our readers like as "banging a drum", but you may have meant something I just didn't understand. Now, as for the big adverising dollars, I took a look at the February QST issue. I counted two 1/8th-page ads, two 1/12th page ad and a 1/24th- page ad, plus 4 ham ads, for companies offering kits. This is only a small percentage of our total ad space; most of the ads are for some form of ready-made product. Our editorial policy is not influenced by our advertisers; it is determined by our perceptions of what hams want to see. If the big advertisers were able to set our policy, they would want us to run an article titled "Don't Build Your Own Stuff -- Buy from QST Advertisers!" :-) : As a hobby which has a tradition of mentoring ("elmering"), we are : doing the Right Thing(TM) when we identify something like a Ramsey : kit which is apt to blow a new ham's radio budget out the window : while discouraging him or her, and leaving him without a working : rig. Our QST Product Review did indeed point out the problems we found with the Ramsey FX-146. We also pointed out those things we like. This ensures that QST reviews are complete and unbiased. People who read these things are able to decide which things are important and buy accordingly. -- ------------------------------ Date: Thu, 27 Jan 1994 17:35:08 GMT From: nntp.ucsb.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!cs.utexas.edu!utnut!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ab376@network.ucsd.edu Subject: Sideband Technology Inc. To: info-hams@ucsd.edu Recently liberated from our corp. lab, what appears to be a VHF Transceiver. Rig was built by Sideband Technology Inc. of Scottsville N.Y. Model number is the ACSB Pioneer 1000. Appears to be a 4 Channel Xtal controlled with Xtals for 154.450 Mhz. Looks like a straight forward VHF rig from the Main board, but underneath is another board chock full of chips in what appears to be the audio section. Anybody any info on these rigs? Would love a manual or even a schematic. Regards -- ############################################################################## Mike Ligeza Snr.- VE3UIL Ottawa, Ontario Canada ------------------------------ Date: 26 Jan 94 16:28:27 GMT From: psinntp!psinntp!gdstech!gdstech!bat@rutgers.rutgers.edu Subject: TF3CW QSL address To: info-hams@ucsd.edu I have a 1991 listing that says to use the TF buro. -- *-----------------------------------------------------------* * Pat Masterson D12-25 | KE2LJ@KC2FD * * Grumman Data Systems | 516-346-6316. * * Bethpage, NY 11746 | bat@gdstech.grumman.com * ------------------------------ Date: 30 Jan 1994 00:20:57 GMT From: destroyer!news1.oakland.edu!vela.acs.oakland.edu!prvalko@uunet.uu.net Subject: Your experiences on 40 meter CW QRP To: info-hams@ucsd.edu Andrew M. Cohn (andy@clark.net) wrote: : If you work 40 meter CW, with 5 watts or less, and use less than ideal : antennas (no beams, dipoles or rhombics, etc), I would like to hear about : your experiences. No...I'm not writing a book; I just want to know what : I can expect before investing in a QRP station! Andy, Why do you want to "invest in a QRP station!" ??? Getting into QRP is something you generally do AFTER you've become bored with the typical "fivenineQSLQRZ" contacts. If you are just studying for a ham ticket, I HIGHLY recommend NOT to get involved with a QRP radio as a first choice. Others disagree with me but they are in the minority. So wazzup??? 73 =paul= wb8zjl *** VANITY CALLS COMING SOON!!! I GOT DIBS ON K8T !!!!! *** ------------------------------ Date: 27 Jan 1994 10:29:59 +0200 From: mvb.saic.com!unogate!news.service.uci.edu!usc!howland.reston.ans.net!pipex!uknet!EU.net!news.funet.fi!butler.cc.tut.fi!lehtori.cc.tut.fi!not-for-mail@network.ucsd.edu To: info-hams@ucsd.edu References <2i44fb$e2h@news.acns.nwu.edu>, <2i66ll$m9t@vixen.cso.uiuc.edu>, <2i699h$6sc@news.acns.nwu.edu>k Subject : Re: CW filters and DSP-9: A recap of mimimum bandwidth Rajiv Dewan (rdewan@casbah.acns.nwu.edu) wrote: > In the thread on minimum bandwidth required for CW signal: [Estimates between 16 and 72 Hz arrived from different approaches] This approach is based on the Modulation and Demodulation chapter in the ARRL handbook. The baud rate BR is defined as WPM / 1.2 and thus 20 WPM is about 16.7 Baud. The bandwidth BW is define as K * BR. Both CCIR and FCC recomend K = 3 for non-fading circuits and K = 5 for (selectively) fading circuits. Thus 20 WPM requires 50 Hz or 83 Hz if 5th harmonic is included. In the same chapter, there is a graph with rise and fall time vs. maximum speed and rise/fall time vs. required bandwidth. If 5 ms rise and fall times are used (recomended by the ARRL) the maximum speed for non-fading circuits is 60 WPM and 45 WPM for fading circuits. At 5 ms rise/fall times the occupied bandwidth is about 150 Hz (-23 dB). If we assume typical speeds (12-20 WPM), the transmitted spectrum is dominated by frequency components from the rise/fall transition and not from the information contents of the signal. Except for a relatively few high speed operators, the rise/fall time recomendation could be increased, which would reduce the occupied bandwidth. Using receiver filters which are narrower than 150 Hz will increase the post-detection rise/and fall times, but the impulse response of the filter becomes more critical. At below 50 Hz and the third harmonic is attenuated making aural reception very hard but machine reception of 20 WPM should be possible down to 17 Hz bandwidth. Paul OH3LWR -------------------------------------------------------------------- Phone : +358-31-213 3657 X.400 : G=Paul S=Keinanen O=Elisa-Tampere A=ELISA C=FI Internet: Paul.Keinanen@Telebox.tele.fi Telex : 58-100 1825 (ATTN: Keinanen Paul) Mail : Hameenpuisto 42 A 26 FIN-33200 TAMPERE FINLAND ------------------------------ Date: 29 Jan 1994 22:48:14 GMT From: usc!howland.reston.ans.net!europa.eng.gtefsd.com!emory!news-feed-1.peachnet.edu!concert!inxs.concert.net!rock.concert.net!mikewood@network.ucsd.edu To: info-hams@ucsd.edu References <CKAu6K.4Hy@freenet.carleton.ca>, <2i9e52INNmf7@newsstand.cit.cornell.edu>, <n1gakCKCyrq.M4K@netcom.com>rt Subject : Re: Sideband Technology Inc. In article <n1gakCKCyrq.M4K@netcom.com>, Scott Statton <n1gak@netcom.com> wrote: >In article <2i9e52INNmf7@newsstand.cit.cornell.edu> F. Kevin Feeney <fkf1@cornell.edu> writes: >>In article <CKAu6K.4Hy@freenet.carleton.ca> Mike Ligeza, >>ab376@FreeNet.Carleton.CA writes: >>>Transceiver. Rig was built by Sideband Technology Inc. of Scottsville >>>N.Y. Model number is the ACSB Pioneer 1000. Appears to be a 4 Channel >>>Xtal controlled with Xtals for 154.450 Mhz. Looks like a straight > This company was purchased by Aerotron , Inc a land mobile radio manufacturer, around 1985. Aerotron is in Raleigh, NC and continued to manufacture the units until a year or so ago. Aerotron is in Bankruptcy and recently held an auction of the remaining ACSB and land mobile stuff. The remnants of Aerotron has been moved to Orlando, Florida to share facilities with another near death company (Repco) owned by the same Greek investor. The radios have some very nice 9 Mhz xtal filters in them. Mike Wood Internet: mikewood@rock.concert.net The Signal Group P.O. Box 1979 ***Avoid company disclaimers by owning the company *** Wake Forest, NC 27588 Phone: 919-556-8477 Fax: 919-556-0115 > > ------------------------------ End of Info-Hams Digest V94 #91 ******************************