Ten-Tec_Corsair_560_review_1984.pdf

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1、oo o BY JOHN J. SCHULTZ, W4FA TheCorsairsports some brand-newTen-Tecequipment styling Have the boys at Tennessee Technology come up with another winner in their new ear- satr transceiver?Well, only time will tell. How- ever. they certainly have come up with a very inleresting transceiver. To start w

2、ith, the Corsair has a bright, new styling as compared to some formerten-tee products It is not that the basic color scheme used has changed much, but the dark-out plexiglass panel over the meter anddigital fre- quency display, the placement and grouping of the contrors and switches. the changed tri

3、m scheme,etc.,all indicate that Ten-Tee took a hard look at the packaging of their new top-ot- the-linetransceiver,Theresult is a very smartly designedunit that really can only be appreciated by seeing it.Itis also an amazing- ly Iiqht-weiqht and compact unit (14 Ibs. in a 15 x14x5package) GeneralCh

4、aracteristics The Corsair is a 100watt output class trans- ceiver designed forC.W.,s.s.b.,Any, and SSTVoperation on all existing and proposed amateur bands. Detailed specifications for the unit are shown in Table I. As one glances through the specifications, one will note quite a few interesting fea

5、tures, some of which will be covered in more detail later, For instance. onreceivethert.preamplifiercanbe switched in or out, there is 2.4 kHz 12-pole crystal-ladder s.s.b. filtering. various optional s.s.b. andcw.filters. passband luning,select- ablea.q.c.6-digil frequency readout, notch filter, no

6、ise blanker with adjustable threshold. RIT, and a good dynamic-range specification. On transmit.85-100 watts of output power are available, full break-in operation is provid- ed oncsv.with stoetone. the metering in- -. eludes forward PEP power and s.vcr.,and the power output can be varied over a wid

7、e range. Speech processing is not mentioned, butitis included. The 100% duty-cycle specification isquiteinteresting in thatitis achieved without the use of any cooling fan! The controls,indio caters. and connections available cover jus! about any imaginable operating requirement. Circuit The basic b

8、lock diagram of the Corsair is shown infig.1.Basicallyitis a single conver- sion circuit using a9MHzi.f.but with anaocr- uonerdown/up frequency conversion to 6.3 MHz to provide a passband tuning feature, ThePTOfeeds a variable 5.0 to 5,5 MHz signal into the Osc./Mixer board where that signal is mixe

9、d with the output01a crystal oscillator so the signal going into the AF Mix- erboard is correcttowork with a 9 MHz U. For instance, for operation on 40 meters, 7.0-75MHz. the PTa output frequency is translated to 16.0-16,5MHz in the Osc./Mix- erblock. In this manner, full 500 kHz cov- erage is obtai

10、ned on the 1.8.35.7.0, 10.0, 14.0,180,21.0. 24.5, and 28,0 to 30,0 MHz bands (the latter in lour 500 kHz ranges). Crystals are included for the 10.0. 18.0, and 24.5 MHz bands. and the Corsair is ready to go on those bands. A few bonus features are that the PTa range actually has about a 30-40kHz ove

11、rrun on band edges so many MAAS fre- c/oCOMagazine 22COJanuary1984 Although the Corsairhas new styling.it fits in nicely withotherTen-Tecequipment in this station setup, (The Hercules solid-state linearisbelow it and the Model229tuneristo the right.) Say YouSaw It In CO SayYouSawItInCO .- Frequency

12、Coverage1.8-2,3.35-4,0, 7,0-7.5, 10.0-10.5. 14 0-14 5. 18.0-18 5. 21 0-21 5. 24 0-24 5. 28,0-300MHztrereeeoe(VFOprovidesapproximately40 kHz overrun00eachbandedge) V F.O. StabilIty Less thant5Hz change perFaveraged overa 0 change Irom70to110Fettee30 mmutes01warnuc. Less than 10 HZchangeIrom105 to 125

13、v.a.c.line vollagewhenUSInga Ten-recpower -TUnIflg Rate: Vernier. 18 kHz perrevoluhon,lyplcaL Readout6 d91t. 0,3LEDnumerals, Accuracy:!:100Hz. Seml-GonductorS 1 LSI,2Oics.94neosrstces.107 diodes.6LEDreadouls. PCBoards.22PCassemblies WIthp1ug.Incables ccosuoctco:Rigid aluminum chaSSIS,Dark paintedalu

14、minumfront and rearpanels,teture!IOPandecucn Soap-up.steel ball. Po!Ner Required 12_14vdc. 850rnAreceive, 18,5 A maxtrensmrt. DimensionsHWD5Yox15x14 (13x38x36cm), bail relraelad Net Weight14100,(6,4 kg), ReceiVer Sensitivityo25,.V lor 10 dB5+N/N, all bands 0.8,.Vtypical withr.I.ampnne-oil. Selectivi

15、ty: t2polecostauecoerliIlering 2.4 kHz bandWidth. 1.7101shape factorat6/60dB.Three-position switchseiecrsstandarde.s.e.lilter,optional-8 kHzs.sb.utter,500Hzc.w.filter, or 250 Hz c w hiler. Notch Filler: Greater than 50 dBoctcntunable between200Hz and 3,5 kHz, CWsootWith 750 Hz reference tone. f.F. F

16、requencies: 9MHzand 6.3MHz, Antenna Input: Low Impedance,unbelaoced AudioOutput1watt8ohms With less than 2% distortion. Built-in speaker. Spurious Responses:All below equivalent 10 dB 5 + NINsignal except 1.838MHz(less than 15dBS+NIN), 21.300 MHz (less than20dB5 -NIN).and28,980 MHz (which canbe elim

17、inated by usinglowend of29.0-29.5 MHz band segment). Noise Blanker:Built-in.adjustable blanking threshold I.F. Rejection:Greaterthan60ca. s.veter:Automatically switched on when receiving, Calibrated to50IV at 59.:l:3 dB, Dynamic Range:90dB, typical. OttsetTuning: Dual range, max,:l:4 kHz: min,:l:500

18、 Hz, typical, Tr.nsmitl D.C Power InputMaximum200waue14v.d.c.c.w.ands.sb 100% dUly cycle for up to20minutes, RF. Power Output. 85-100watts.typical, Outouf Impedance:50ohms, unbalanced Microphone InputHighImpedance. Accepts highorlowimpedance microphoneswilh5 mV output, Polariz ing voltage available

19、for electrets. TIRSWitching VOX or PITons.s.o.Inslant breakin orserrn-breae-monc.w. C.Wscercre:Internally generate!AdJ uslabletone and volumeindependent01e.t.gain control.ocetaiesoo- Iyincwomode. S.S,B.ceeeraice: 9 MHz, 4-poIecrystalladdeftutet.Balancedrrocuietor. Camer Suppression60dB IYPlcal Unwan

20、ted Sideband Suppression: 45 dB typical at 1.5 kHzlone, socrsocsOutpul:BellerIhan - 45dBrerauve to lull output MeIer: Forwardpower,eosecrcrcuerent. s w.r. processing level.seecree-f)OSltlOllSWllch c w.ousee750 Hz,eutoenauc. A.L.Gcontrol: F,onlpanel adjUSlal)le. 30 to 100wallsoutool,LEDlIl(flcator. F

21、ront-PllIII C,llKtioMIndConIflll PST: OFFSET; AFRFAMP; RFPQWER, NOTCH; DRIVE;aeroswucn Main Tuning Knob; MODE: METER switch; VOXGAIN, VOX DELAY; PROCESSlevel;N.B.LEVEl;Alethreshold: OSKNQXSWitch;A.GGSWitch: XTALSWitch: OFFSET SELECTSWitches(2):SPOT push-button: PHONES: MIC. kIPI.C,netliDns, ndCrlll

22、EXT. TIRjilck: AUDIO INjilCk. AUDIO OUT jack; AUX. 12 VDC jacks(2); KEY jack:PITjilck. VFO INjilCk, VFO OUT jack: ACCESSOflIESsockel,llNEARecceer.GNDlermlnal: EXT.SPKRjack: POWERsocket.50OHM ANTENNAconnectOf (50-2391 , RX ANTENNA jack. RXTRXswilch. Table1 -Corsair specifications. 23 CIRClE 84 ON REA

23、DER SERVICECARD one for gating and one tor noise detection, De- tection oftast-nsespike-type noise pulses causes the gating circuitry essentially toIn- stantaneously interrupt thei.l.signaluow.The initial selectivity is provided by astanoard a-pore2.4 kHz s.s.b. filter. If desired, this filler canbe

24、replaced by anocnonera-porecrystal filter. The signal isnedrouted to a passbandron. ing board as shown in fig,3.The feature Is neatly executed,0 3 is the localoscillator, and its nominal 15.3 MHz crystal-controlledtre- ouencvcanbeshilled plus orrmnu-alewkHz bycontrolling017.an MV209 varector diode.

25、The incoming9MHz signalis translated to6.3 MHz. goes through one of thecrystalfilter blocks (fabeled 2.4, 1.8, ,5. and ,25).andthen is retranslated to9MHz in the output stage 02.By varying thefrequencyollhe 15.3 MHz oscutator,the passband01the crystal lilteron the board ismovedacross that01the prece

26、d- ing 2,4 kHz lilter. The standard2.4kHzs.s.e. quencies are covered, the1.8MHz band ex- tends to 2.3 MHz to cover part ot the Marine band, and the10MHz band includes, of course,WWV. In the receive mode. incoming signals are routed through the J owpass filter assembly re- curreofor the PA stage (auv

27、e-corefilter on each band), via a PIN diode circuit for input signal switching to Ihe bandpass filter board and then toa2N3866r.t.amplifier stage. This stageissnownin more detailin fig 2.II isinter- esting inmet uiscompletely broadband with no tuning required. Inteet.the only tuning assocratecwith t

28、he Corsair is the main tuning. After amplification, the Signal is routed10a oocme-beiencecdiodeQuadmixer on the sameboard fortranslation10the9MHzt.t. Theboard also contains atow.noseLI.pream- plifier. The followingoorse-btareerstage is in serted in theU.path ahead ot any highselec tivity crystal lrt

29、ter stages. Therorse-blanker stage splits the incoming signalintotwopetns, TUBES,SEMICONOUCTORS,ICS 0I00ESATSUPERLOWPRICES INOEPTHINVENTORY ElMAC,SYLVANIA,GE,CETRON SWRLPF Final BPF LLDR , I I I I I I I I I I _.J P.T.Q. - - -, DSC/MIX - - - - Notch Counter r I I I I I I L - - TIR TIR I I I I I I I I

30、 I r I _TJ r I L_ -, - - - r I I I r I L r- I I I I I I I I I I I L_ r r I I I 1 1 4poleI S56 II L.J r-, rI IN.B. I ;g .Control R BFOVOX . R, board f-T i rrn xer AF PRQC-Mic - S; K,y Fig , Corsair block diagram OA2_. . .$2.75 1-400Z. . . 115.00 :J.5OOl90.00 4CX2SOBl720353.00 4CX100llAl8168.430.00 4P

31、R6OCJ8252W,.,295.00 4X1SOAl1034 ,.58.00 SAR4 . . ._. . 4.13 SC22 . . ,., .185.00 SR4GB . . . ,.3.85 8,1(,5, . . , U 6 BALS,2.93 6A05. . ,_2.85 BCAT. .5.81 SDJa_,2.75 8JGBA . . ,8.53 6J56C ,8.05 6KD6 , . . .6.90 8l6GC. . , _5.25 6KV8A.,8.02 6lF6. 1.111 BLOB6.83 8MJ6. ., . 7.28 12ATT _2.93 12AU7 ._2.6

32、3 12AX1A . 2.64 572etTl60L .,.49.50 105A. 10.00 811A ., . . . 13.50 813 , . .1.0.00 829B.40.00 832A, . . 33.00 833145.00 866A. 9.50 812,_, . 24.00 M2057 . ,15,00 5670,4.40 SS), $ oe t: 1 1 cs . c 00 4:n!-,. . wQIU 0033 0- ,n0 U . .,. J;O , r b C J,-?, kc-(l , . . r , :;); m , r+, ,to , ,. , ., T 1-

33、- co, I I I I .- I I I I I I I I I I I L Fig.2-Thefirstactivedevice in thetront.eraofthe Corsair is thet.t.amplifierstage Q2, whichisabroadbandamplifier.Afterthis stage the receivedsignal goes throughadouble-balanced mixerandexits via03.anotherJow-noiseamplifier. Diode switchingprovidesfor usingcir-

34、 cuitryon ther.f.mixerboardfor the receiveandtransmit signal pathS. . pretty bland description01any conventional, soqre-converslon9MHz transceiver. How- ever, it wasmeant just to set the groundwork so one can visualize thebastemakeup of the Corsair. So, what makes the Corsair different? In one sente

35、nce it could be expressed asin- novative and honest execution of a basically proven transceiver design concept using ex- ,. , c-2J3lI66 02-3N2Q1 Q.17.PS 2AKH.-fERSTN4WOI -0flCRSAALCJPn:;IioI$.I 100I ea,RHI D LJ Fig,3-The passband tuning systemisneatly containedon onecircurfboard, except,ofcourse, fo

36、r the front-panel potentiometerwhichcontrols varactordiode017and (he switches used to selectdifferent filters. Construction The foregoing, frankly, may sound like a transistor switches for controll ing voltages that switch the transistor between the receive and transmit modes. Among other things, it

37、 provides for a slowlfast break-in feature on c,w, ,-;-1 I I Fig. 5 also shows the VOXcircuitry. which has front-panel controls for gain and delay, After the circuitry of fig. 5, the a.t. signal is fedtoa balancedmodulator and ac.s.b.signal is generated. Thed.s.bsignal goes through the standard 2.4

38、kHzs.s.o.filter and on to the RFMixer block, where It is translated to the final output frequency, The signal is then am- plified in various stages until it reaches a pair of MRF458 transistors which operate in a push-puf arrangement at 200 wattso.c.input on all bands. The PA stage is completely bro

39、adband and touowec by a lowpass filter as- sembly and an s.w.r. detection block. The Ircnt.panet meter automatically switches be- tween being an5 meter on receive and a multi-function meter on transmit. The s.w.r. reading lunction is unique in that there is none 01theusuallorwardsetadjustment neces-

40、 sary. Also, the forward power meter reading is of the peak-reading type, so it indicatesPEP. The S.W.r. bridge circuitryalso supplies an a.l.c.feedback voltage and a control voltage which is used to drive an ALC LED which in- dicates relative output power. Circuitry that is common to both the recei

41、ve and transmit functions includes the frequency readout and control circuitry. The frequency readout circuitry basically revolves around an LSI IC, the MOSTEK type MK50398N,Itac- complishes all of the counting, latching, mul- tiplexing, output decoding, and driving func- tions on a single chip. The

42、 counter basically reads theOsc./Mixboard output frequency, but it is fed preset information to convert its output to the actual transmittedorreceived frequency.Italso follows and indicates any frequency offset set by theOffset (RID con- trol in the receive mode. The actual readout is on largeO.3 in

43、ch LEDdisplayswiththe sixdigit display having five red readouts and one green readout for hundreds of Hertz. The con- trol circuitry basically encompasses various 26COJanuary1984 SayYouSawItInCO , . . o. . . . . I OO!:.e.?O .-.-L_ .- - - - - - - - - - - - - - - - - - - -. I I I I I I I I I I I J ceu

44、ent Q uality, ccoservauveiy ratedcoree- nents.There are not alOt of bellsarcwtu s- lies asfound on some transceivers(although every needed feature iscresenn.Overall, one receives the impression that the Corsair was designedbydedicated radio amateurs who actually use the equipment themselves. Two pho

45、tographs show the Corsair with its top and bottom covers removed, As one can see,ten-teehas taken the design approach of splitting the circuitry among a fairly large number ofPCboards. In fact, there are some 22PCboards. This type of approach requires agoodamount of interconnection wiring,but it kee

46、ps various signalcircuitsisolated, andcoe coesnot have the problem01spikes and spurious signals running around a very large PCboard.Itis probably one reason why the Corsair has such acieeo-soundingsignalboth in the receive andtranarmt modes. One can see from Ihe photographs that the PCboards are ver

47、y neatly arranged, and a lot of care has been given to shielding of individ ual sections,For instance, the receiverI.am- plifier assembly is shown in the center of the photograph with the bottom cover removed, the shielded PTO assembly isbelow it. the out, puttow-passfilters are1 0meleft back in the

48、ir enclosure, the LI,powerstagesare in a corn- pletelyshielded enclosure with heal sink mounted on the rear panel of the transceiver, etc.One can also see Iromthe photograph of the top the space which is providedonthe top- rightPCboard tor the installation of theccton- all.8kHzs.s.nfilter and the500

49、Hzor250 Hz c.w.filters. Thebandswitching assembly(pho- tograph of theboltom) looks rather imposing with all its sections,but it works Quitesmooth- Iy. In fact. it feels like a single wafer switch Say YouSawItInCO when oneacwauvusesitEverythingIS switched directly by the bandswitcn. There areno diode switChingschemesusedasfar as the mainr.tcircuits are concerned. The only significant dioder