President_HR-2510_review_1989.pdf

《President_HR-2510_review_1989.pdf》由会员分享，可在线阅读，更多相关《President_HR-2510_review_1989.pdf（4页珍藏版）》请在收音机爱好者资料库上搜索。

1、no o TheUnidenHR-2510 10MeterSSB/CW/FMTransceiver BY DAVE INGRAM, K4TWJ Unidens newHR-2570is acompact, all-mode 10meter transceiver withasensitive receiverand25waltoutput transmitter. hats this? Anew 10 meter trans- ceiver that actually fits in tcdeys com- pact cars and sports an attractive price ta

2、g toboot?Sure enough, and Unroens newHR-2510is sure10capture the hearts and interest of 10 meter devotees everywhere.Itis a genuine fun rig you canmount in acarwithits supplied brack- et. slide into an open corner at home, or slip into a small tote bag fortraveling. This 25walloutput transceiver cov

3、ers 28.0001029.700 MHzwitn5SB.CW,AM, and FM operations; built-in SWA bridge; semi-break-in CW:RIl; noise blanker; and more. The receivers sensitivity of .25 uV isQuite adequate, and when10 is openasithasbeenrecently.25wattscan workplenty of Ox. In fact.myfirstweeks worth01050swhileusingthe HR-2510 w

4、asallOX!Withsunspotsincreasing every day, alillierig likethe HR-2510 is loads of fun. Imsurethatmanyamateurswillre- cognizeUnldensnamefromtheir popu- larBearcatscanners,cellulartele- phones, andotherelectronicitems. The HR-2510 is their firstseriousentryinto theamateur radio field. I would saythey w

5、illwatchusprogressasameasureof considerationinproducingadditional amateurradiogear. GeneralOverview ThecompactHR-2510 is enclosedin a blackanddarkgraycabinetmeasuring 2i?Hx7Y.Wx110,andweighs roughly4POUnds.ThefrontLCD readout isambercolor,withselectablebrightor dimbaCklighting.Itsleft sideincludes b

6、ar-graphmetering,and the rightsidein- dicatesfrequencies,Astoutinternal speaker ismountedon thebottom,anda healthyheat sinkontherearis flankedby connectorsforantenna.power,andac- cessories. Rather than usingregular inch phonejacks,Unidens2510 hasone nine-pinMolexsocket forconnectinga key,externalspe

7、aker,andauloPA speaker.Switchingfrominternaltoexter- natspeakerand/orconnectinga keythus EestwooaVii/age No.1201So.,Rt.11, Box499,Birmingham, AL 35210 20COFebruary 1989 involvesreplacingone accessory plug withanother(supplied) plugwiredtoyour speaker and/or key. The transceiver draws lessthan 1amp o

8、fcurrent duringreceiveandonly4to5 ampsduringtransmit.Thoselow-power consumptionliguresareappealing in several respects.Youcanenjoysome fairlylongmobileoperatingstintswhile parked in ashopping-mall lot, for exam- ple,wtthouttotauydraining acarsbatte- ry. An inexpensiveandlow-currentAC supplyalsomates

9、perfectlywiththerig forhomeorportableuse. Thereceiversoverallsensitivity, se- lectivity, andaudioqualitystrikemeas surprisinglygood, especiallyconsidering itslowcost.ItsSmeteris a bitonthe stingy side,butthatsnotserious-only truthful,The AITcontrolcoversroughly a 6kHzspan,whichisperfect.butnew amate

10、ursmustremembertocenter-posi- tionthecontrolforreceivingand trans- mittingonthesamefrequency. An RIT offswitchis notincludedI suggest placinga smalldrop01redfingernailpol- Ishcnthatknobspointeras a mental re- minder. Additional HR-2510 detailsand specificationsareshown in TableI- Amateursinterestedi

11、n self-contained portableoperationscanputtogether somecleversystemsusingtheHR-2510. Visualize, forexample.home-fabricating a slip-inmetalbracketfor holdingthe transceiveranda 5amprechargeable VCA-typebattery, Add acarryinghandle andWhiporduckyantenna plus a mike clip,andyouhavea midsize handheld tha

12、twillliterallyworktheworld.Imagine usingthatsetuponamountaintopor while relaxingonawarmsouthernbeach. Now thatsliving! We alsounderstandKA8PGJ inDayton interconnectedhisHA-2510and2meter transceiverforremotebaseoperationon 10meterFM,Asimpleone-transistorin- terlacewasusedbetweeneachunits squelch-volt

13、ageterminalanda basic Say You SawItInCO Tab/e 1- Technical specificationsofthe Uniden HR-2510. CORcircuit.Bynowhehasprobably worked allcontinentsona handheld. AFrontPanelTour A convenientmeans offamiliarization with any new transceiver involves trek- king through itsfront-panelcontrolsand their oper

14、ationin a step-by-stepmanner. Using thattechnique,letsstartatthe 2510sleft topareaandproceedtothe right bOttomwhilepausing for afewde- scriptions along the way. First, several behind thepanel as- pects arenoteworthyin thetransceivers modeswitch.CWoperations, for exam- ple, include a built-in sideton

15、e thattracks with the rigsvolumecontrol. Its semi- break-inoperationisquitesmooth (no clattering relaysatall!),andthepreset delaytimereturns to receivemodeafter t secondofkey-up. If desired, the front TXbuttoncan override that function formanual T/Rswitching. Agroupof nine pushbuttons is mounted on

16、the front panelsleft side.Onebutton steps through themeters functionsfor selechng RFoutput.modulation, SWR, and calibrationmodes.Anadjacentfront control isused inconjunction with the SWRfunctionforcalibratingandmeasur- ing SWR in theusualmanner,Another pushbuttonadjuststhermcropnone gain-pressit in

17、for loworreleaseitlor high. Thatmayinitially seem a bitcom- promising,but it isactuallyquiteconveni- ent. Another interesting feature is Ihe 2510s Beepbutton. When pressed, a briefloneis addedattheendofeachSSB transmission. Youve probably noticed manyoperators using that toningmethod during contests

18、.IIsbecomingquitepop- ular, and itmaybea real boon for Novices. Frequency coverage isdividedinto four bandsegmentswhicharestep-se- lectedby the2510sbandpushbutton (see Table I forfrequencyranges). The maintuning knob is alsolightlydetented lor easyand positivemobileuse,Itthus has the feelofa 2meterF

19、M rig rather thanfree Wheeling. Three tuningrates are step-selected via a front butlon-lO kHz. 1 kHz,and100Hz. Asmallcursor appears under thatselecteddigit in the transceivers LCD readout. I found the1 kHzspeedidealforgeneralbandtuning andoperating,andswitchedto the 100 Hz speedonly for fine-tuning

20、DX stations. Isncoealsomentionthe2510s front memory channelbuttonsandmike up/downswitcheslikewiseoperateonly in 10 kHz steps-not toogoodfor SSB, butperfect for fast OSYsandoperating 10meterFM. The international calling frequencyon10FM is 29.600MHz, with otherchannelsstackingup thebandto 29.700MHzin

21、10 kHzincrements. Popu- lar repeater outputsareevery20kHz (29.620, 640, 660, etc.). Their inputsare usually- 100kHz(29.520,29.540, 29,560,etc.).Transmitoffsetsarenot in- 22COFebruary1989 Gelleral FrequencyRange Microphone Speaker OperalingModes Display DisplayItems Size Weight Transmitter Frequency

22、Stability OutputPower Spurious Harmonic Emissions Carrier Suppression Unwanted Sideband Suppression PowerConsumption (NoModulation, PIT Depressed) (MaxModulalion) MicrophoneInput CWKeyVoltagelCunent Receiver Sensiuvnyfor10dBSIN SensitiVity for20eeSIN Adlacent ChannelSelectivity MaxAudioOutput RFGain

23、Range RllRange1 SMeterSensillvify at S9 ImageRejection Raila PowerConsumption, NoSignal PowerConsumption,MaxAudro eluded in the2510,sosome fastbutton pressesfillthevoid. Itworks. I keyed sev- eralrepeatersandthenswitchedto their outputandheardmysquelch tail. Honest! Both RFandAFgaincontrolsarein- cl

24、udedonthe2510sfrontpanel.sore- ducingsensitivity whennearbystations areexceptionallystrong is a snap. The unitssquelchalsoworksonallmodes. so youcanleave the rig quietlymonitor- ing forbandopeningandbepleasantly alertedwhenDXconditionsaregood, The rigsnoise blanker is pushbutton-se- lectableandnot l

25、evel-adjustable,butit workslike achamp. Uniden reallyhas theiracttogetheronthatfeature. It even reduces power-line noises! While the2510has an impressive- looking front panel with 20controls, its useofmutedcolorsis verybeneficialfor mobile installations. Flashy rigscatch evil eyes. The2510blends wit

26、h the dash inmanymoderncars, anditssmall enough to fit into those open trayareasin manycenterconsoles. BandA-28.DOOO-284999 MHz BandB-28.5000-289999MHz BandC-29.0000-294999MHz Band0-29.5000-296999MHz 500ohmsDynamic,wlPITandChannel upanddown 8ohms,3W CWoUSB,LSB.AM,FM BacklitLCD Frequency,Channel-, Me

27、ter,MeIerMode TX,Band,VFQSpan 732-)(103S)( 2.44- 410s30z x300HZNominal, (aI2SC. Sminutes atterpoweron) CW2SWNominal USBILSB2SWPEPNominal AMIFM 10WNominal -SOdBNominal,allmodes - S5dB Nominal,USBILSBModes -45dBNominal,USBILSBModes AMIFM3 ANomina! USBILSB08ANominal CWSA Nomina!(KeyDown) AMIFMIUSBILSBI

28、3 ANominal 1mVNominal forSO%AMModulation 8VOC,10mA AMSIV Nominal CWIUSBfLSB2S,.VNomnat FM5,.VNommal 70dBNominal (10kHZSpacmg) 4WNominai SSdBNomnal :!:3kHzNominal l00.VNommal 6SdB Nominal 500 mANominal 1000mANominal CirCUitryOverview Brieflystudyinganytransceivers blockdiagramalways reveals its inner

29、 beauty,so retstake acloserlook inside the HR-251O.First, I will point out that fig. 1sdiagramis Slightlysimplified for dis- cussion. The original filledtwolarge pages. There is a substantialamountof circuitryin this little rig. Lets begin with thereceivepath. An incomingsignalfromthe antenna movest

30、hrough the $WRdetectorandthe low-pass filter,andthen tapsoffand goesupto the RF amplifier (a 2SC1647L transistor is used). Itmovesthrough the 10meterbandpass filtertothe receive mixer.whereitisoownconvertedto 10,69 MHz.Noticethe noise blankers amplifier.detector, ALC.andgating switchabove the IF fil

31、tersection-im- pressivefor alow-costrig. The signal continuesthrough the bandpass filter to the IFamplifier(noticetakeofflorthe AGC section), then continues to the AM orSSBdetector. Finally, thedetectedsig- SayYouSawIt InCO NBAle F PLl RX. F FFNF TF 0.- ToIF .,. SSBDetf.n1 AFAmpjl-l.J lPF, T-RS. F A

32、mp Coo.,., VotageAXReg Reg.8V )(Ale Fig.1-Simplifiedblockdiagramofthe Uniden/Presidenr HR- 25 10.Light lines are receivepaths, while dark lines are transmit paths.Seediscussionin text. PleaseMII(Jall,eeder ,nQutroes areI,.H eo.0, .0 Compatible $595 MODEL PCl000 st. . . . ,$000 .,.,. .,., n,oo ,S Dig

33、nalLCRMellr _LC-l800 33 Decld.8101 1610 0 .;1518.95 DC0lOOMH, Ou.1 Cfuln.1 DoloyO!s_o CRT flMOoul S _T . 0_ 0orang o TrIOI/M loci o 2mVSen. iti.,y $1.285 FutodlanGener. . 1:fII600 _ .$28.95 ., - 0 _0._ .-.,.,. . Cornorn_s.-._._ ,_ ,omo._.,-, oAts . _._,.Po FAtEIptNdlhMlu dwordpn.c.saar 3.3Scos.ndGWB

34、nlcaddS75 10MHzXT100%IBM 5Year Warflnly Soldell,Bmdboatd, 2201.,2. 12V. SV. ,3 -S01SA XP-5olIO $59.95 roo S23 M.II.1I0 - 1.010.-To. ter $55CM15OG _.voao,O/lm, Cu,gh.SCAT e-CAT mYs.nolly Buinp.,_K.10111 .118Kv .c_,Vollogo oomPOO ,.10P-I OOH , . .1ClsnlS OM.l imo .!.x.v0.;ZAx, TV SylC._, x.yOpeoDelTOl

35、lTnweng S,_ TOPquaouyIlat.l._.co_Con011_,.,oo,_ ,Twoh,10.p_.d,avamoanlmaoual.T,NIII,od CIVtOI0-. 00001,8 dlaLEDdao. 1500+WATTTRANSMATCHKIT$169.95OTHERKITS G3RUH, PSK Packet Modem,Satellite andTerrestrial . . .$111.00 G3RUH, OSCAR 13Telemetry Demodulator. . . .$144.95 ORP 20, 5w,2QmeterTransceiver (H

36、R 1/69).$124.95 WlFB 160180Pre Amp (OST8188) . ,. .$19.95 K9CW Memory Contest Kayar. . .$109.00 Yaesu FRG9600, .1 1 0 60 MHz Converter.$94.95 BASIC KIT-INDIVIDUALITEMS20m CW, 15w Transceiver (H.R. 6/67)$159.95 .28 59005OW75MSSBSCVA.$199,95 1-rotaryInductorp.Factory Wired 2 -6:1ball drives . .$9.00 e

37、a.AmpSupplylAmeritronfTenTec Products.CALL 1 .O-lCIOturnscounter$65.75Bk, etc. VISAlM.,ereerd 2DMHz DUllTraceOscilloscope $359 MO-1251 WE WILL NOT BE UNDERSOLD!CCATAIOC; DignalTllplePowerSupplyX P.765 $249 Q.2OV.1A Q.2OV. A 5V., ,:lidw , ,0,., _001_ xp.wwith1DlI.1sn5 A CCllmll-On i cutnntAd.p SH65 022 Q.OOOA.oc1lI.:J.500Ill. Wo,wh.$125., $175 mooO.0 24 CIRCLE150ONREADERSERViCECARD