Date: Tue, 25 Jan 94 12:43:11 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 #74 To: Info-Hams Info-Hams Digest Tue, 25 Jan 94 Volume 94 : Issue 74 Today's Topics: Anyone know of a callsign server? CW filters and DSP-9 Famous hams Ham Radio and More talkshow how can I find Kiss definition Low Power VCO MFJ's 20m SSB Travel Radio: No RIT?! NEWS ARCHIVE Ohio/Penn DX Bulletin #144 OPDX/NODXA 1993 DX Survey RFD: talk.politics.rush-limbaugh ThickLAN Ethernet Where is FAQ on EMF? Yeasu FT416 mods wanted 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: Thu, 20 Jan 1994 17:12:56 GMT From: utcsri!newsflash.concordia.ca!sifon!clouso.crim.ca!hobbit.ireq.hydro.qc.ca!barde!vaillan@uunet.uu.net Subject: Anyone know of a callsign server? To: info-hams@ucsd.edu In article 1824@newshost.pictel.com, wpns@newshost.pictel.com (Willie Smith) writes: >apollyon@crash.cts.com (Shannon O. Sullivan) writes: >> telnet callsign.cs.buffalo.edu port 2000 > >Someone also mentioned port 3000, and 'callsign' used to be 'marvin', >but none of the above work any more. Did the internet callbook go >away, move somewhere else, or is our net connection broken? All I get >is 'unknown host' errors. > >-- >Willie Smith wpns@pictel.com N1JBJ@amsat.org >Some people you don't have to satirize, you just quote em - Tom Paxton I did: telnet callsign.cs.buffalo.edu 2000 yesterday without any problem. The machine: callsign.cs.buffalo.edu real name is: electra.cs.buffalo.edu (128.205.32.2) Clem. 73 --- Clement Vaillancourt, | Institut de Recherche d'Hydro-Quebec Analyste, | Varennes, P. Quebec, Canada, J3X 1S1 Informatique scientifique | Tel:+1 514 652 8238 Fax:+1 514 652 8309 vaillan@ireq.hydro.qc.ca | Radio-amateur: VE2HQJ@VE2CRL.PQ.CAN.NA ------------------------------ Date: 24 Jan 94 20:36:44 GMT From: sdd.hp.com!col.hp.com!srgenprp!alanb@hplabs.hp.com Subject: CW filters and DSP-9 To: info-hams@ucsd.edu Clark Savage Turner (turner@safety.ics.uci.edu) wrote: : Reference number 2, some filters don't do so well at this, and some narrow : filters have a "ring", or hollow sound to them. Many don't like this at : all. Most IF filters don't have much ring, though some, many audio filters : (except DSP I understand) can ring pretty badly. Even analog filters can be designed for low ringing. The problem is that most crystal IF filters, and some audio analog filters, are designed for a "flat-top" response, which tends to aggravate the ringing problem. DSP/digital bandpass filters have ringing as well, although it is easier to control than with analog filters. You should be able to do 100 Hz or so bandwidth using either analog or digital techniques with negligible audible ringing. Any narrower than that, and you will be limited by the stability and tuning rate of the HF transceiver anyway. AL N1AL ------------------------------ Date: Tue, 25 Jan 1994 12:43:39 GMT From: agate!howland.reston.ans.net!usc!elroy.jpl.nasa.gov!newncar!uchinews!att-out!cbnewsj!k2ph@network.ucsd.edu Subject: Famous hams To: info-hams@ucsd.edu ------------------------------ Date: 25 Jan 94 18:33:49 GMT From: news-mail-gateway@ucsd.edu Subject: Ham Radio and More talkshow To: info-hams@ucsd.edu My local Talk America Radio Network affiliate (1510 in the Boston area) didn't run "Ham Radio and More" this past Sunday evening. Did anyone in a different part of the country hear the show, or was it QRT nationally? -- Scott Ginsburg Voice: 508-436-3836 | too much DX, Wellfleet Communications Internet: ginsburg@wellfleet.com | too little 2 Federal St. Amateur Radio: WA2CJT | time... Billerica, MA 01821 ------------------------------ Date: Tue, 25 Jan 1994 18:01:28 GMT From: agate!howland.reston.ans.net!pipex!zaphod.crihan.fr!jussieu.fr!univ-lyon1.fr!ghost.dsi.unimi.it!dm.unibo.it!beppe@network.ucsd.edu Subject: how can I find Kiss definition To: info-hams@ucsd.edu I'm intrested to know kiss protocol definition If you can help me Please mail beppe@csr.unibo.it ------------------------------ Date: Sat, 22 Jan 1994 05:25:53 GMT From: ftpbox!mothost!pts-nntp!davebmac.pts.mot.com!user@uunet.uu.net Subject: Low Power VCO To: info-hams@ucsd.edu In article <2hp6ct$3h6@hpscit.sc.hp.com>, rkarlqu@scd.hp.com (Richard Karlquist) wrote: > > In article <2hk0r2$kht@dartvax.dartmouth.edu>, > Johan D. H. Goedkoop <daan220@draco.dartmouth.edu> wrote: > > > > > > Frequency Range: 138-153 MHz > > Power Supply: 3 Vdc @ 3 mAmp or > > 5 Vdc @ 1-2 mAmp > > Output (Power): +8 - +10 dBM (50 Ohm Load Resistance) > > Control Voltage: 1 - 3 Volts > > Op. Temp. Range: -45 to +70 degrees Celcius > > > > > > You'll have to build your own using an MRF931 transistor and an MV1404 tuning > diode. I'd pick the 5 volt supply over the 3 volt supply. Allow a day or two > of design time. > > > Rick Karlquist N6RK > rkarlqu@scd.hp.com Any Particular reason you picked the MRF-931? We've been using MRF941's in even lower power applications, and getting what we consider good results. Sorry, no spec's off the top of my head. David Bengtson All Standard Disclaimers apply Motorola Paging and Wireless Data Group Sorry, no witty quote. MS 98 1500 NW 22nd Ave Boynton Beach, FL 33467 ------------------------------ Date: 25 Jan 1994 16:06:07 GMT From: pacbell.com!well!nigel.msen.com!spool.mu.edu!howland.reston.ans.net!sol.ctr.columbia.edu!news.cs.columbia.edu!mix-cs!popovich@network.ucsd.edu Subject: MFJ's 20m SSB Travel Radio: No RIT?! To: info-hams@ucsd.edu greg@netcom.com (Greg Bullough) writes: > In article <2i0ra6$2na@clarknet.clark.net> andy@clark.net (Andrew M. Cohn) writes: > > > >But, where's the RIT?? How can you work SSB/CW without an RIT? > > Learn how to tune? Yeah, why do you need RIT anyway? I'm serious, when I work HF it's just another useless knob on the rig. Maybe I'm dense, but I've never managed to figure out what it's for. I hardly ever touch it. If the station you want to contact is operating normally, you just zero-beat him and that's it. The only time I can think it might be useful is if you want to contact a DX station who is operating on split transmit/receive frequencies, but then they're usually too far apart (anywhere from 3 KHz to a couple of hundred KHz) for the average +/- 2 1/2 KHz RIT control to do any d--n good. Maybe it would be good for switching in and out to tune in the one oddball in every net who can't be bothered to get any closer than somewhere in the general ballpark of the net frequency, but that's about all I can imagine. What do you use this knob for? -Steve, WB3I ------------------------------ Date: 20 Jan 1994 17:41:33 GMT From: mvb.saic.com!unogate!news.service.uci.edu!usc!cs.utexas.edu!howland.reston.ans.net!usenet.ins.cwru.edu!eff!news.umbc.edu!haven.umd.edu!umd5.umd.edu!w3eax.umd.edu!dwarkin@network.UCSD Subject: NEWS ARCHIVE To: info-hams@ucsd.edu Hello. Where can I find the archive of postings made to this news group? Thanks. dwarkin@w3eax.umd.edu ------------------------------ Date: Sun, 23 Jan 1994 14:50:20 -0700 From: ucsnews!sol.ctr.columbia.edu!destroyer!nntp.cs.ubc.ca!alberta!adec23!ve6mgs!usenet@network.ucsd.edu Subject: Ohio/Penn DX Bulletin #144 To: info-hams@ucsd.edu SB DX @ ALLBBS $OPDX.144 Ohio/Penn DX Bulletin No. 144 The Ohio/Penn Dx PacketCluster DX Bulletin No. 144 BID: $OPDX.144 January 24, 1994 Editor Tedd Mirgliotta, KB8NW Provided by BARF-80 BBS Cleveland, Ohio Online at 216-237-8208 14400/9600/2400/1200/300 8/N/1 Thanks to the Northern Ohio Amateur Radio Society, Northern Ohio DX Association, Ohio/Penn PacketCluster Network, DL7VEE & DXNL, DF4RD, CT1XX, IW2IYN, AD1C, KC1AG, NA2M, WA2ABN, N2PNG, K4CEF & Southeastern Cluster Group, ON6TT, N4VZ, N8BQJ, K8YSE and NE8Z for the following DX information. 3Y0PI, PETER I ISLAND DXPEDITION. As the countdown continues for the start of this DXpedition, here is some important information: KA6V and AA6BB, are the QSL Managers and they ask that you put "ALL" your cards into the same envelope or put all your QSO labels into one card. "DO NOT" (repeat DO NOT) mix VP8BZL and VP8BZL/MM cards with the 3Y0PI cards (send them separately). Mixing operations in the same envelope will cause a delay in processing your QSL cards. Include a SASE or SAE and enough to cover at least the return postage. The 3Y QSLs will be printed in Belgium and have the same layout as the AH1A and VP8SS I cards (folding type with colored pictures). There is room for 5 QSO's per 3Y-card. If you have more than 5 QSOs, more cards will be needed, and the cost of postage will increase (So, remember send enough to cover this!). Next week we will have more on operating frequencies and practices. EU/EV/EW, BELARUS (NOT YET!). Bob, N4VZ, had a chat with Yuri, RC2AR, and Yuri states that Belarus will not be using its EU, EV, or EW assigned prefixes until June 1, 1994. This is surprising since most other countries have made the changeover to their new prefixes and this will add more confusion since Russia uses the "R" prefix. FO, FRENCH POLYNESIA. Walter, DJ0FX, will be active on CW/SSB through February 19 as FO0PT. He will be using 100 watts into a vertical antenna. Activity should be on all bands including the WARC bands. GD, ISLE OF MAN. Several stations have been active on the WARC bands and the lower bands. GD4WBY has been heard on 12 and 17 meters between 1400 and 1630z. GD4PTV has been heard on 80 meters at 0800z and GD4BEG on 160 meters between 0630 and 0730z. Steve, G4UOL, will be active until the 6th of February as GD4UOL. His activity will be mainly on CW (11 kHz up or on 3507, 10102, 18070 and 24900). QSL via the bureau or CBA. HK0/I2RAO INFORMATION. Marco, IW2IYN, reports that the "Italian DX Bulletin" states, "operations by I2RAO from Gorgola Island is considered as Colombia for DXCC, and the previous from Malpelo should really count as Malpelo". PJ2, NETHERLANDS ANTILLES. Seppo, OH1VR, will be active from Curacao as PJ2/OH1VR from January 26 through February 2nd. Seppo is a contester and it is likely that he will be active in the CQ WW 160 Meter CW Contest next weekend. S2, BANGLADESH. Eric, S21ZG, has been active almost daily on 80 meters (3651-3653 kHz) at 1145-1215z and again around 0000z. V2, ANTIGUA. John, AA2LW, will be traveling to V2-land the last week of Jaunary. He will be there through the first part of February (around 10 days). John is actually there on business, but in his spare time he plans to be active on 40-10 meters SSB (his favorite band is 17 meters). QSL to CBA. V4, ST. CHRISTOPHER/NEVIS. Mike, W9NSZ, will be active as V47NS from January 28th thru February 2nd. QSL to CBA. VP2, ANGUILLA. Jim/KK3K, Don/WB6LYI, Mark/KC6XC, Tom/KI4ZN, Howard/W9BVD, Norm/KF7IK, James/AF9A and Wayne/AI9Q (members of the Lambda Amateur Radio Club, LARC) will be active from March 5-10. They plan to be active on multi-band and multi-mode HF, and OSCAR-13 Mode B and Mode S. They claim this may be the first OSCAR-13 Mode S DXpedition. QSL for all operators is direct to their CBA. VP5, TURKS & CAICOS ISLANDS. Tom/K2TD, John/N2VW and Mike/WB2YOF will be active now through part of February. The group will be using /VP5 and their own callsigns. No details of their activities were reported, but listen for instructions on where to QSL. VP8, ANTARCTICA. Brian, VP8CFM, has been assigned as Base Commander at the British Antarctic Survey Base. He will be there for 14 months and will be active as either VP8HAL or his own call VP8CFM. QSL via GM4KLO. VR6BB/VR6JJ DXPEDITION SUMMARY. Here is information about this operation's QSO totals. They made 35025 QSOs (VR6BB - 23311 / VR6JJ - 11714). Here is just a few of their totals by bands: 683 QSOs on 160 meters, 1291 QSOs on 80 meters, 23 QSOs on 75 meters, 2698 QSOs on 40 meters and 538 QSOs on 6 meters. XE/XF1, MEXICO. Rick, NE8Z, will be operating from Puerto Vallarta, Mexico, as XE1/NI8Z from February 13-20. Activities will be on 160-10 meters (including the WARC bands) and the ARRL CW DX Contest. Frequencies: CW - 5 and 25 kHz up from band edge / SSB - Various. SPECIAL IOTA NOTE: Rick is planning to be active from Islas Marietas (NA-189) and Islas Los Arcos Mismaloya (IOTA unknown). Specific dates are unknown at this time, but activity will be on CW (21005 and 14005 kHz) and SSB (21260 and 14260 kHz). Rick also mentions that he is required to take along a local Mexican amateur to these islands. His goal is to spend time on the WARC bands and 80/40 meters. QSL via K8LJG. ZS0, PENGUIN ISLANDS. This may possibly be the last ZS0 operation. Ian, ZS9A, reports that Baldur, DJ6SI, is attempting to mount a trip to the Penguin Islands sometime around Feb 24th. The RSA will turn over both Walvis Bay and the Penguin Islands to Namibia at the end of February. No other further details are available at this time. DAYTON DX DINNER ANNOUNCEMENT. The Southwest Ohio DX Association is pleased to announce the Ninth Annual DX Dinner which will be held on Friday, April 29th, 1994, at the Stouffer Center Plaza Hotel. There will be a cash bar at 6:30 with dinner at 7:15. Tickets must be purchased in advance, and are available from Scott Lehman, N9AG, PO Box 803, Greenville OH 45331. Tickets will be $27.00. Please make your check payable to SWODXA, and send an SASE for ticket return. Seating will be limited, so please order early. If you wish to sit as a group, it would be appreciated if you order as a group. All seats will be reserved. For further information, contact Scott Lehman, N9AG, at (513) 548-6230 or Steve Bolia, N8BJQ, at (513) 429-9954 voice/fax. KEEP THOSE BALLOTS COMING! (Only a 1 weeks to go!) Ballots for the Third Annual OPDX/NODXA DX Survey can be found in OPDX.137. Ballots can be sent to the following packet and online addresses listed below. FAX YOUR DX INFORMATION NOW! Faxing is available Monday/Wednesday/Friday from 0430 to 2330z only. The number is 216-237-8208 and the FAX card is sharing the same phone line as BARF-80 BBS using a data/fax/phone switch. Excerpts and distribution of The OPDX Bulletin are granted as long as OPDX/BARF80 receive credit. To contribute DX info, call BARF-80 BBS online at 216-237-8208 14400/9600/2400/1200/300 and leave a message with the Sysop or send InterNet Mail to: aq474@cleveland.freenet.edu or send BitNet Mail to: aq474%cleveland.freenet@cunyvm or send PRODIGY Mail to: DFJH48A or send a message via packet to KB8NW @ WA8BXN.OH.USA.NA /EX ------------------------------ Date: Sun, 23 Jan 1994 15:21:52 -0700 From: ucsnews!sol.ctr.columbia.edu!howland.reston.ans.net!cs.utexas.edu!math.ohio-state.edu!cyber2.cyberstore.ca!nntp.cs.ubc.ca!alberta!adec23!ve6mgs!usenet@network.ucsd.edu Subject: OPDX/NODXA 1993 DX Survey To: info-hams@ucsd.edu SB ALL @ ALLBBS $OPDXNODXA.5 OPDX/NODXA 1993 DX Survey THE THIRD ANNUAL OPDX/NODXA DX SURVEY. Here is your chance to be counted. Deadline will be January 31, 1994, with results in February. The questions of the survey will deal with: 1) The DXer of the year. This is a DXer who you thought was outstanding in operating and handling the pile-ups from their DXpedition. 2) DXpedition of the Year (Group and Indivdual). Choose the best and most well organized DXpedition that met the needs of the DX community. 3) The 30 Most Wanted Countries. Choose your 30 most wanted countries. 4) OPTION: Your personal comments about DXing in 1993. Please use the ballot below. Votes will only be accepted in the following format below. ____________________________________________________________________ Your | DXer of the Year| DXpedition of the| DXpedition of the Callsign | (Person) | Year by a person | Year by a group and QTH | | | ____________________________________________________________________ CHOOSE YOUR MOST WANTED COUNTRIES. (Please list only 30 of your most wanted countries. List CW and SSB modes separately. CW - AB,CD,EF SSB - GH,IJ --------------------------------------------------------------------- Comments on DXing in 1993: (Text Any Length) _____________________________________________________________________ * Just Fill-in The Blanks And Send It To One Of The Three Address: "Packet Radio" - KB8NW @ WA8BXN.OH.USA.NA "InterNet" - aq474@cleveland.freenet.edu "PRODIGY" - DFJH48A OPDX/NODXA DX Survey Example Ballot: ____________________________________________________________________ | | | | | | ____________________________________________________________________ CHOOSE YOUR MOST WANTED COUNTRIES. (Please list only 30 of your most wanted countries. List CW and SSB modes separately. CW - SSB - --------------------------------------------------------------------- Comments: (Text Any Length) I think DXing in 1993 was.......... _____________________________________________________________________ /EX ------------------------------ Date: 25 Jan 1994 06:06:17 GMT From: agate!howland.reston.ans.net!usenet.ins.cwru.edu!nigel.msen.com!yale.edu!noc.near.net!das-news.harvard.edu!husc-news.harvard.edu!husc.harvard.edu!husc8.harvard.edu!cstone@network.ucsd.edu Subject: RFD: talk.politics.rush-limbaugh To: info-hams@ucsd.edu ================================ RFD: talk.politics.rush-limbaugh ================================ This is a formal request of discussion for the creation of a Rush Limbaugh-related newsgroup. Please direct all followups to news.groups. PRPOSED CHARTER: The unmoderated group talk.politics.rush-limbaugh will serve as a forum for the discussion of issues raised by Rush Limbaugh's radio show, TV show, books, newsletters, and other media. It will also act as a place for Rush listeners to talk about Rush fandom such as the opening of new Rush Rooms in various cities, methods of obtaining tickets to Rush's TV show, Rush's appearances in public and on other TV shows, and so on. This function, however, is likely to be secondary to the group's primary mission of hashing out the issues of the day, and hence the group shall be part of the talk.politics.* hierarchy. It is *essential* to note that posters of *all* ideological stripes will be welcome on talk.politics.rush-limbaugh. Articles critical of Rush are to be afforded the same respect as articles in support of Rush. It is hoped that the creation of the new group will inspire intelligent political discussion by using Rush's thoughts as a springboard. BACKGROUND AND RATIONALE: On the newsgroup alt.fan.rush-limbaugh, we have been discussing the possibility of formally incorporating the group into the talk.politics.* or rec.arts.* hierarchy for some time now. The former was chosen largely because political, as opposed to fandom, discussions dominate the group now. Several people, myself among them, have argued that a rec.arts.* placement would be better because Rush usually insists he is an entertainer first and a pundit second. However, support for a talk.politics.rush-limbaugh appears more widespread. With a recent onslaught of insulting posts and namecalling by radical conservatives and Rush-haters alike, the creation of a moderated newsgroup has some intuitive appeal. However, in my opinion, the spirit of free inquiry demands that the group be unmoderated. In an highly charged ideological forum such as talk.politics.rush-limbaugh, the potential censorship costs of moderation will prove too high. Alt.fan.rush-limbaugh is one of the largest alt.* newsgroups, and I fully admit that I think the high rate of traffic on alt.fan.rush-limbaugh indicates that Rush-related subjects deserve a formal place on the usenet hierarchy. Moreover, Rush's radio show has become increasingly accepted by the mainstream, non-ideological media as of late. Rush has also exhibited far more staying power than comparable talk show hosts. It is also essential to note that many sites to not offer access to alt.* groups, and given that -- for good or ill -- Rush's popularity has soared in recent years, people from those sites deserve the opportunity to discuss Rush just as much their counterparts elsewhere. On the liberal side of the aisle, the net also offers the perfect place for Rush's thought to be subject to rigid scrutiny. VOTES If the proposal comes to a vote, I shall contact Ron Dippold within twenty-one days of today's date. -- ////// // // ////// // ////// Christopher Stone // // // // // // // cstone@husc.harvard.edu // ////// ///// // ////// (617) 493-7523 // // // // // // // 366 Lowell Mail Center ////// // // // // // ////// Cambridge, Massachusetts 02138 ------------------------------ Date: 20 Jan 1994 16:54:38 GMT From: mvb.saic.com!unogate!news.service.uci.edu!usc!sdd.hp.com!hpscit.sc.hp.com!icon.rose.hp.com!hpchase.rose.hp.com!cmoore@network.ucsd.edu Subject: ThickLAN Ethernet To: info-hams@ucsd.edu SMITHSON@ACM.ORG wrote: : I think I've seen the answer to this question posted a few moons ago, so : please forgive me. I've run across some Thick-LAN Ethernet coax. I think : it is 50-ohm, but I wonder if anyone has any other details on impedance, : loss, etc. It is the orange jacketed cable and is a little less than 1/2 : inch dia. Brian, Are there any numbers on the cable? Without the numbers I can't be sure, but here is a guess, from the Belden catalog: 89880 Ethernet Cable Description: Plenum version of 9880 trunk cable; Orange tint FEB Teflon jacket, cellular FEP insulation, ring-band stripes marked every 2.5 meters to aid users in tap placement. Construction: Aluminum Polyester + 95% tinned copper braid + Duofoil + 95% tinned copper braid Diameter: .375 inches Impedance: 50 ohms Velocity factor: 78% Capacitance: 26 pF/ft Loss: .19 db/100ft at 1 MHz .37 db/100ft at 5 MHz .52 db/100ft at 10 MHz 1.20 db/100ft at 50 MHz Chris Moore N6IYS cmoore@mothra.rose.hp.com ------------------------------ Date: 25 Jan 94 19:35:32 GMT From: news-mail-gateway@ucsd.edu Subject: Where is FAQ on EMF? To: info-hams@ucsd.edu A friend in Seattle is looking for info on electro-magnetic fields (EMF). Gary Coffman mentioned a FAQ dealing with the subject. Could Gary or someone please advice where I might ftp a copy? If anyone knows of other relevant materials, bibliographies, etc., could you please send them to me? (Please send direct -- avoid clogging the bandwidth.) Thanks. Paul Marsh N0ZAU pmarsh@metro.mccneb.edu ------------------------------ Date: 25 Jan 1994 09:42:35 GMT From: qualcomm.com!vixen.cso.uiuc.edu!howland.reston.ans.net!xlink.net!zib-berlin.de!netmbx.de!Germany.EU.net!EU.net!chsun!elna.ethz.ch!elektra!mpeter@network.ucsd.edu Subject: Yeasu FT416 mods wanted To: info-hams@ucsd.edu hello, are there any mods for the yeasu FT416 available ? I'm looking for: - extendet TX (got 140MHz .. 150MHz) - extendet RX (got 136MHz .. 176MHz) - repeater switch on beep, 1750 Herz like the euro version has (got the american version without that tone) - hidden, undocumented features Thanks for any hints Martin -- Martin Peter, ETH Zuerich e-mail: mpeter@ee.ethz.ch Computing Support Group tel: 41 1 623 5286 ISG Gloriastrasse 35 fax: 41 1 252 0954 8092 Zurich/ Switzerland ------------------------------ Date: (null) From: (null) Let's not forget 5R4GY as well. Famous in Collins circles. 73, Bob K2PH -- ---------------------------------------------------- Bob Schreibmaier K2PH | UUCP: ...!att!mtdcr!bob AT&T Bell Laboratories | Internet: bob@mtdcr.att.com Middletown, N.J. 07748 | ICBM: 40o21'N, 74o8'W ------------------------------ Date: 20 Jan 1994 17:22:52 GMT From: news.cstar.andersen.com!news.acns.nwu.edu!casbah.acns.nwu.edu!rdewan@uunet.uu.net To: info-hams@ucsd.edu References <hamilton.758953096@BIX.com>, <cowart.759075998@neptune>, <milewski-200194082137@fp2-st-affairs-11.uoregon.edu>w Subject : Re: DSP Audio Filters In article <milewski-200194082137@fp2-st-affairs-11.uoregon.edu>, Steve Milewski <milewski@oregon.uoregon.edu> wrote: >In article <cowart.759075998@neptune>, cowart@convex.com (Michael Cowart) >wrote: > >> >> I have an FT-990. I also have the Timewave DSP-59. If you liked what the >> SCAF filters in the 990 did, the DSP-59 will knock your socks off. On CW >> it can can go down to 50Hz bandpass, all you hear is the tone with virtually >> no ringing!! But it really shines on SSB with its 2 noise reduction and >> heterodyne elimination algorithms. Try one some time, you'll be amazed!! >> I have had the DSP-59 for about 8 months, and now I can't do without it! >> >> 73, >> Mike > >Sounds interesting. I just bought a Ten Tec Omni VI and within a week will >have all the optional filters (inluding 1.8khz SSB filter, 500, 250 hz CW >filters and the 500 hz narrow filter for the second IF). > >Will the DSP help in this situation or would it be overkill? For CW only, my guess is that the DSP is not worth it. I have a Kenwood 850 with cascaded 500Hz filters or combination of 500Hz and 270Hz. The W9GR DSP unit (I expect the DSP-59 to be similar) offers no particular advantage. * Disclaimer: I do not operate SSB, so get the salt shaker ready.* About SSB - the Omni Vi comes with the multi-heterodyne notcher and so the only value will be from the white noise reducer. All of the DSP units that I have heard distort the audio when in this mode. Further they only work well when the SNR is high. In that case, you may as well use the rf gain pot - cheap and effective. I discovered this in attempting to get a clear broadcast station reception. The only mode for which I have found the DSP filter to be of value is RTTY. This, I suspect, is because the filtering in Kam-All-mode is a bit too all-mode --- compromised, that is. :) Sorry for raining on the DSP parade. I think the next generation of products with - the kind of processing described in QEX for CW (nice artice Jon) - may be, harmonic alignment and interface with rig for automatic tuning/lock on SSB (see the disclaimer above) - smarter rtty demodulators that exploit the mark/space partial redundancy better might really begin to exploit the promise of DSP for ham radio communication. Rajiv aa9ch r-dewan@nwu.edu ------------------------------ End of Info-Hams Digest V94 #74 ****************************** ******************************