TS-870S_review_CQ_1995.pdf

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1、CQREVIEWS: The Kenwood TS-870S Transceiver BYLEWMcCOY.WlICP Many times in my career Ihave been called upon10reviewnewequipment.Ottentheunits Iamaskedto review fit into thesamecatego- ry (such as transceivers), and in that case they have similar bells and whistles. To be very honest, most of the majo

2、rmanufacturers have excellent units, anditfrequently is difficult10 separateoutstandIngfeatures.Inthecaseof thenewKenwoodr$-870$transceiver.hOw- ever, this isnot the case, Tomyway of think- ing, digital signal processing(DSP) has final- ly arrived with thisnewtransceiver. First Impressions The Kenwo

3、odTS-87OStransceiver. The firstIS-870SIreceived was from a very early production run.andconsequently I did notgetamanual.Likeanyamateurradiooper- ator. Iwasanxious10trytheunit,soIdidwhat Im sure no other amateur has ever done: I turned it on without having read the manual. After all,how couldIgo wro

4、ng if I only listened to the receiver? I turned up the audioandfigured outhowto swucnthe unit to20meters. AI firstIdidnot hear any background band noise.Istarted to tune and wham! An S9 signalpoppedup, and he was loud and strong. Whenttcnedaway, tneband sounded extremely quiet. FinallyI started to t

5、weak a fewofthe knobs that con- trOlthedigital filtering. and that was whenIreal- ly got a surprise. The display of the receiver showed that tweaking one filter knob resulted inthebandwidth of one portion of the filler going from6000cycles down101400cycles. Ithen set the control at2100cvcies.as Icat

6、- TechnicalEditor, CO. 1500W ldahoSr.,Silver City,NM88061 culateo this wouldbeagoodbandwidth for SSB reception. AsIluned between signals, I noted the band was quiet.Obviously.the filter was reducing randomnoise appreciably. II wasapparenttorrematthedigitalfilteringpro- ducedexceptionalSkirtselectivi

7、ty. The stated rating is60dB on the skirts, and suchcertain- ly wasmecase. CWFiltering My next step was to test thecwtiltering.How- ever, before describing that. let me give you just a little history on the subject. Yearsago(backin the19605) Iworked at theARRL intheTechnicalDepartmentByron Goodman,W

8、1DX,was one ofmybosses, and he had become interested in theumnsof selectivity. He buill up a multiple IF(interme- elate frequency) strip to test selectivity. He kept making hisreceiver setup more and more selective, untilhe reached a pointwhere a sig- nal hadsomuch ringing that itwas no longer goodc

9、opy. Thatpointwas180cycles.Itwas Shortlyafter that when the commercial receiv- erpeople set2CJO-.cycle filters as the maximum standard. Such filters were never standard equipment, but always cost a bundle as an add-on. Just ask any Collins equipment users. That brings us to digital signallechniques.

10、 I switched theTS-a7OStoCWand started 10listen to CW signals. The digital filter could be adjusted to a setting of50cycles!I found twofairly strong signals thai were almoston exactly the same frequency.Ithen went10 careful luning and foundthatIcould easilysep- arate bothsignals-andIdomean easily. Th

11、ere are two tuning rates. The slowest is .The TS-870S with the bottomcover removed Rear viewoftheKenwoodTS-87OS 0_ron.IlJn.tv1QQC:; SayYouSawItIn CO - .6 . 52 at :JO 52 10. 53 38 53 52 . . ,. , a , 5 , , A OF ON OF OF 7 ON 0 ON ON , , BOOH, 011/2 0Ff,1-20 0- 1/ 2 011/21314 OFF,1-2O 011/21314 ON OFFI

12、ON OFF/ON ON 011/21314 OFF,1-20 OFFION seJtc:lI_- ., c1/ 2 OFF, 1-2O 214J6I8ms F OFF/ 120013001P _,F,5S8.-.dAAl -.LOWIDTH_ HfSHFT. -_.- Doo_.,OIl; _1.,., 40014so;50015501 60016501100/ 7501 8OOI85OI9OCV9so; 000 -6.-3.0.+3. 6tS -6.-3.O.+3. 6 dB e AFoutputlevelklrDigitaloperation(MCPITNC RX) 0minimumle

13、vel) .9(maximumlevel) Miaopl.lllAGereleaselime 0:Slow1:Mad2: Fast ONriseandtimes ,. Filter bandwidlh lor digital operation OFF:BandwidthlIeBt:tableIlia LOWIDTH8fW:lHlI$HIFTaOOlb,. 1200:For.,.;oostWI P.FIl.W1OctspIayed whileopera1ong, 300:For narrowlt (2310or2110Hz,200bps) P;PSt( irlUleY8Ilor0igitIlo

14、peration(MCPITNC TX) O;l00mV1:311mV2:10 mV AutomaticAGCreleasetimelorFSKmodo 1 Slow.20 Fast ONRXpilch!TX side!ooe lrequency AF AGe levelfor FMandAM modes 0:OFF.1:Min,2:Med.3:H-11,4:Max AutoTI.WlefactiVe lIIhie PeakHoldlormeier TXIRXI(iflerencelor s-eeiercorrection torAlPeKcludlIM S-me!ercorreclionfo

15、rFt.4modo LneEnhancel.n:lion I.ioeEnhancer.1Selime 0(fast.4(Slow) $PACtime BeatCancelresponse time 0 (Fast).4(SlcIw AutoNok:h,espoiISebloe .Q FasI.4 I!FIl.WlO I!FrLNA/f I!1LPSK AUllMAN AGCSSB AGCCW . MENU.AIB AIP.GAIN FM.SMET UNE.ENH UNE.ENH ,.oN MICAGC PITCH PKT.OUT ONRISE SP.NOTCH AF.AGC.LV RX AT

16、HOUJ dFREQ t, PflOC.HI XINH AGCFSK TRACK PKT.Fll Nollr:_ _ .sss _.N , .OJ. Owt,.t NdJ -,= e 03 23 a Fig1-Thisis apage fromthemanual showingsomeofthe MENU functions. 20 or 02 26 07 05 00 09 rc u ta 13 . MENUCONFIGURATION . ,. 00 PK-203 PK-200-B PK-205 ModelPK-205 Slr8IghtKey(RedB_) $150.00 Model PK-2

17、05-GStraightKey(GoldPlated) $330.00 AIkeysadd56.S81M!allin Calif. KEYERS JONESKEYS MEhIneclbr-.rneeNrUm. Ror.ybiIllIKebe.lgS. Solid(WMgtrt3-11210). Engraved serill number. Model PK-200Dualpaddle(RedB_1 S11O.oo ModefPK-2OO-BDl*pkIle(ANEQa) $190.00 Model PK-2OO-G DUlIl paddle (GoldPlated) $350.00 Mode

18、lPK-203SingMIlev.(Allar-) 111t5.00 Sendforfreecatalog. ingthefilterpassbandwidth in the formora rainbowarc.Thewiderthepassband.thelarg- er the arc. In the5O-cycles position mentioned earlier, the arc consists of only lhree bars. While receiving. youhave thebar-typeSmeter. This also is unusual in tha

19、t as the signal being received shiftsupanddown.as insideband reception. a singlebarsegment is leftvistble at the peak01signal strenqth. It is easy to tell the otheroperator you are workingexactly what hisrecer.edsignalpeak is. While trans- mining, themeterserves as acalibrated power meterplusanAlCme

20、ter. anSWRmeter, or a speech-processorcompressionmeter.A PEAK Hold function which holdseachreading forabout2.Ssecondscanbeactt.ated. Also while transmitting, a calibratedpowerreading andAlCreading are available. Inaddition. either SWROfspeechcompression is shown. TheBasics 1(X)()cyclesperrevelution.

21、which isadequate toseparatesignalswiththefilters inthe sharpest position.Thefastest rate is10kHz per revolution.Ialsomightadd herematwe havehadOSP for some timenow, buf most of ithasbeendoneetaudio. Thisprocessingon theT;OFf_ 1X IIndahln Settlng ;IHz) (Menu 0:311). .200LO 2. U 2.3 2., 2.2. 3.2. . .,

22、 2.,. 2 2.2 2. 2. 3 , 2. 200 ., 2. ., 2 2.2 2. 2.3 2. 2.3 2.2.2. 3.32 2. 300 ., 2. 300 ., 2. 2.32. 2.3 2. 2.3 2.2.2. 3. 3.3 2. . U2.2.U 222. 2.3 2aa 23.2. 3.32. 500 ., 2.3500 ., 2.2.2. 2.3 2. 2.3 23 2. 3. 2 Conclusion Thetransceverhas100memories,withSCAN. grouportotal, plus all the othertuoctoosyou

23、would normally expect in a first-class rig. My conclusion should be obvious at this point.Iconsider theTS870Stobea major milestooe inthedevelopmentofreceivers and transmitters.Itcertainly will revolutionizeOUf hobby.And Icanseethisbeingaveryhot item with DXersandcontesters. Theserecucuv characterist

24、icsalone make it standout-an addition to the dual VFOs and weak signal receptioncapabilifies-andthe computer aspect certainly rroves us into a different era in transceiver technology. Icould go on lorpages andpages.tam sure youhave many questions, butIm sure Kenwood will fill you in through their ad

25、vertis- ing oftheT5-8705. TheIisfprice of the r5-87OOis$3199.95.It is manufacturedbyKenwoodCorp.,P.O. Box 22745, 2201E.Dominguezst.LongBeach, CA90801-5745(customer support!brochures 310-639-5300). Menu , Derln, func:Uon No. Stletll90S - 22.-I: Med AGeRelease1; Moo Time2; Fast MitfOphoneAGC .,.b3llSf

26、TIItlWlMio.lllAGe10 pleEllciSlOftlODwe10overtyhighadioIIis disabledwhileusingONOff$K. TransmilBandsllifl TransmilbanOshitIismodifiedviaMenuNo.30 (TX.SH1FT).Theilvailable s rtiOllSilducIe: 0, 100, 200, 300. 400.and500 Hl Thedefaultis300HzCoosolllhe8aOOwidIhf BandshiflTableloraddrtOollal data. Wheothe

27、 SpeechProcessoris swrtchedON.thebandwklI1 changesasshoWni1thiStable;/loweY8f,disPi!yed valuesdonotd1anglftanl .,gadIIIhidlon-ttle-fIiactiVit)youflUSU8. HoweYer.lseasylobeca:suaIand0teIl0CIk!hislad: sinceyoudonSlen10yourOWIsignal.The loIowiIII sct-seeacnsprovidei1I01malionthatwilhelpyoutailor your l

28、ransmitledslgIaI, CIIao,ingTransmitBiilnll.lllth TransmiI:bandwitIhisrTlCJljf1ediiiMenJNo.29 (TXWIDlH).TheavaiabIesBla:liulSiIduOO: 1600, 2000,2300,2600.and3000 Hz ThedefauRIs2300 Hz, COnsuRtheBaoctwidltV Tableloradditionaldata.Whenthe seeecnPO(155PisSVICd1edON.1hBbiIlidwdl, dI3logesasshl;Mo1iltnISl

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