Date: Sat, 2 Apr 94 04:30:24 PST From: Ham-Equip Mailing List and Newsgroup Errors-To: Ham-Equip-Errors@UCSD.Edu Reply-To: Ham-Equip@UCSD.Edu Precedence: Bulk Subject: Ham-Equip Digest V94 #91 To: Ham-Equip Ham-Equip Digest Sat, 2 Apr 94 Volume 94 : Issue 91 Today's Topics: Hamfest List - Mid Atlantic States Q: FT890 mod RF and AF speech processors. Was: FT-990 vs TS-850 Which HF rigs have Transverter Jacks? 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-Equip Digest are available (by FTP only) from UCSD.Edu in directory "mailarchives/ham-equip". 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: 31 Mar 1994 19:43:38 -0500 From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!news.intercon.com!news1.digex.net!access.digex.net!not-for-mail@network.ucsd.edu Subject: Hamfest List - Mid Atlantic States To: ham-equip@ucsd.edu MID-ATLANTIC HAMFEST LISTING March 31, 1994 The following is a listing of known hamfests in the MD/NJ/PA/VA area. I will update this list as necessary. Please send any additions or corrections to me at cps@access.digex.net so that others may benefit. Thanks, Chris Smolinski, N3JLY April 10, 1994: HAMCOMP '94 8AM-1PM, $5 adm, $12 tailgating, $20 table. Trenton State College, Rt 31, Ewing Township. Talk-In 146.67-, 146.52 simplex. Contact Don Write AA2F (609) 737-1723. May 15, 1994: HAMFEST '94, 7AM-2PM, $5 adm, $8 tailgating, $12 tables. Middletown Grange Fairgrounds, Penns Park Rd, Wrightstown, PA Talk-In 147.09/R, 146.52 simplex Contact: George Brechman N3HBT (215) 443-5656 May 21, 1994: Cherryville Hamfest, 8AM-2PM, $6 admission, $10 tailgating, $15 tables Warren County Farmers Fairgrounds, Rt 518 North, Harmony, NJ I78-exit 3. Contact Keith Burt, KF5FK, (908) 788-4080 before 10PM VE Test Session Contact Marty Grozinski, NS2K, (908) 806-6944 before 9PM Talk-In 147.375+ & 146.820- May 22, 1994: Great Hagerstown Hamfest, 8AM-3:30PM, $5 adm, $5 tailgating, $20 tables Hagerstown Jr COllege Rec Center, Exit 32B from I-70, right at Edgewood Rd Contact Page Pyne or Fred Bailey (301) 714-0688 VE Exams 9AM contact Pat KQ8E at (304) 289-3576 Talk-In 146.34+ June 5, 1994: Ole Virgina Hamfest, 8AM-3PM Prince William County Fairgrounds, Manassas, VA June 19, 1994: Father's Day Hamfest, 8AM-3PM, $5 adm, $5 tailgating Walkersville Fire Co, Walkersville, MD, rt 15 to rt 26 to rt 194 Frederick Amateur Radio Club, PO Box 1260, Frederick, MD 21702 Talk-In 146.52, 147.06+, 448.425- July 10, 1994: Maryland Hamfest, 8AM-?, tailgating opens at 6AM Timonium Fairgrounds, York Rd, I-695 to I-83 to Timonium Rd BRATS, PO BOx 5915, Baltimore, MD 21208 VE Exams 10AM, Pre-registration required Talk-In 147.03+, 224.96- July 16, 1994: Red Rose Repeater Assn, 9AM-3PM $5 adm, $5 tailgating, $20 tables McCaskey High School, Reservoir & N Franklin Streets, Lancaster, PA Red Rose Repeater Assn, PO Box 8316, Lancaster, PA 17604 Talk-In 147.015+ August 7, 1994: Southern Patuxent Hamfest, 7AM-2PM, $5 adm, $5 tailgating, $25 tables Prince George County Equestrian Center, Upper Marlboro, MD Rt 301/ Rt 4, exit 11-A (Rt 4 Pennsylvania Ave) from DC Beltway I-495 Contact: Southern Patuxent ARC, PO Box 399, St Leonard, MD 20685 (410) 586-2177 Talk-In 147.15 Hamfest 94, 8AM-?, $5 adm, $3 tailgating Bucks County Drive In Theater, rt 611, 6mi N of Pa Turnpike exit 27 Mid Atlantic Radio Club, PO Box 352, Villanova, PA 19085 Talk-In 147.06, 145.13 August 14, 1994: SARA Carroll County Hamfest, 8AM-?, $5 adm, $5 tailgating, $8 tables Carroll County Ag Center, Smith Ave, Westminster, MD Contact: Alan Parker, KS3L, (410) 859-1475 SARA Hamfest, 607 Brentwood Rd, Linthicum, MD 21090 Talk-In 146.52, 224.68, 224.64 Hamfest & Computerfest, 8AM-?, $4 adm, $7 tailgating, $25 tables Career Institute of Technology, Easton, PA Delaware-Lehigh ARC, RR 4 Greystone Bldg, Nazareth, PA 18064-9211 (610) 820-9110 Talk-In 146.70 September 9 & 10, 1994: Queen Wilhelmina State Park, Mena, Arkansas. $2 park entrance fee, $5 adm. Contact Gerald Wallis, N5KKD, (501) 524-3094 September 17&18, 1994: Virginia Beach Hamfest $6 adm, $15 tailgating, $30 tables, $125 booths Virginia BEach Pavillion Manny Steiner, K4DOR, 3512 Olympia Lane, Virginia Beach, VA 23452 (804) HAM-FEST September 18,1994 South Jersey Radio Assn, 8AM-3PM, $5 admission, $5 tailgating Pennsauken High School Parking Lot, near US rt 130 / NJ rt 73 Contact Diane Nafis, N2LCQ, (609) 227-6281, (609) 228-8088 VEC Test Session registration at 9:30 AM Talk-In 145.290- October 30, 1994: Mason Dixon Hamfest 8AM-?, $5 adm, $5 tailgating, $15 tables Carroll County Ag Center, Westminster, MD Mason Dixon Hamfest, PO Box 763, Hanover, PA 17331 VE exams $5.60, 9AM, reg 8AM, Page Evans NE3P, (717) 359-7610 Talk-In 145.410- ------------------------------ Date: 1 Apr 1994 14:21:06 GMT From: usc!howland.reston.ans.net!pipex!sunic!trane.uninett.no!eunet.no!EU.net!Germany.EU.net!netmbx.de!zrz.TU-Berlin.DE!zib-berlin.de!news.belwue.de!news.uni-stuttgart.de!news@@ihnp4.ucsd.edu Subject: Q: FT890 mod To: ham-equip@ucsd.edu Hi there ! I read about the modification of a FT890 for TX 1,5 to 30 MHz. During the procedure a selection of "mode" "02 on" is mentioned. Does anybody know what the other possible settings do ? Thanks ! Wolfgang DH9SBR ------------------------------ Date: Fri, 1 Apr 1994 08:22:10 GMT From: lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!col.hp.com!news.dtc.hp.com!hplextra!hplb!hpwin052!hpqmoea!dstock@purdue.edu Subject: RF and AF speech processors. Was: FT-990 vs TS-850 To: ham-equip@ucsd.edu Alan Bloom (alanb@sr.hp.com) wrote: : Crystal filters designed for receive filtering are not optimum : for a transmitter SSB generator. : AL N1AL Yippeee ! Thanks, Alan. That one little fact is always a shock to everyone I explain it to. Think of two expensive-grade Japanese rigs in QSO. The transmitting rig will have an SSB generator with crystal IF filter, an RF clipper (Tx IF would be a better adjective) and another SSB crystal filter. For economy, the radio will use SSB filters designed for Rx selectivity as the same filters are switched into the receive path. Serious Dxers will, of course, have changed them for especially narrow ones. At the receiving end, the posh radio on receive will have two SSB crystal filters in use, one in its 9-ish MHz IF, and one in its 455 kHz IF. The sound that reaches the listener's ears can have passed through FOUR receiving-spec crystal filters, some or all of which could be special extra-narrow ones. We are talking of up to 32 poles of crystal filtering, as four sets of 8-pole 2.4kHz wide sections. Just look in Zverev to see the group delay and ringing characteristics. Those filters are important in the receiver, but quite inappropriate in the transmitter, we could halve the damage done to the sound quality. My thoughts for a home-brew ultimate rig are running towards phasing SSB generation, IF speech processing and then a >3kHz wide crystal filter as a post-clipper clean-up. Carrier and opposite sideband suppression will be the sum of the performance of the phasing system and the crystal filter, so neither need produce spectacular performance. Experiments have shown a good, clean, controlled output spectrum, limited by power amp intermod products, and the audio quality was outstanding. Here in the 1990s I'm daydreaming about DSP'ing a similar scheme, Hilbert-transform based SSB generation, arithmetic clipping, and a digital SSB filter feeding a DAC producing a low IF to make a cheap and excellent SSB generator/speech processor. Multiband audio processing looks attractive, but it is the peak of the sum of all the bands that is what has to be controlled, so I think this may not be the best technique. There is, of course no technique that is RIGHT, but some are better than others.... Amusingly, some of the fancy DSP based speech processor techniques turn out to be "RF processors" in digital form. Cheers, David (It's refreshing to have a decent technical debate going in place of the code wars and hand-held questions...) ------------------------------ Date: Fri, 1 Apr 1994 15:01:14 GMT From: ihnp4.ucsd.edu!usc!cs.utexas.edu!swrinde!emory!wa4mei!ke4zv!gary@network.ucsd.edu Subject: Which HF rigs have Transverter Jacks? To: ham-equip@ucsd.edu In article <1994Apr1.002144.141549@yuma> galen@picea.CFNR.ColoState.EDU (Galen Watts) writes: >Subject line says most of it. I know the Kenwood TS-820 has 'em and I've >heard the TS-430 has 'em, but I'm not sure. I'm mostly interested in >synthesized rigs, but any info is greatly appreciated!!! >Galen, KF0YJ Icom IC-735 has them, IC-725 doesn't. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | uunet!rsiatl!ke4zv!gary 534 Shannon Way | Guaranteed! | emory!kd4nc!ke4zv!gary Lawrenceville, GA 30244 | | ------------------------------ Date: 1 Apr 1994 12:46:17 GMT From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!darwin.sura.net!news.larc.nasa.gov!grissom.larc.nasa.gov!kludge@network.ucsd.edu To: ham-equip@ucsd.edu References <1994Mar30.150833.7038@arrl.org>, <1994Mar31.004345.251@ke4zv.atl.ga.us>, <1994Mar31.143525.7073@arrl.org>larc.n Subject : Re: RF and AF speech processors. Was: FT-990 vs TS-850 In article <1994Mar31.143525.7073@arrl.org> zlau@arrl.org (Zack Lau (KH6CP)) writes: >The point is, does the audio phase shift networks used in the 2010 >cause a noticeable degradation in audio quality as perceived by >the users of the radio? And, since we are primarily talking >about SSB, as opposed to AM, there is *no* benefit to having >a detector that can correlate the upper and lower sidebands--we >only have one sideband to work with on receive. Yes, indeed, it does cause a noticeable degradation in audio quality. In the case of units like the 2010 which are primarily going to be used to listen to commercial broadcasters, there is a good bit of benefit in having a detector that can correlate both sidebands, though admittedly for ham work, it's much less of a requirement. But it basically comes down to how much audio degradation you mind. If I am listening to a commercial shortwave broadcaster, I expect much higher fidelity than I do from amateur SSB transmission. With SSB, I just want to be able to make out the words. (On the other hand, I expect a lot more from wideband FM broadcast, although I don't always get it...) --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." ------------------------------ End of Ham-Equip Digest V94 #91 ****************************** ******************************