Alinco_DR-150T_TNC_review_1995.pdf

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1、PACKET USERSNOTEBOOK CONNECTING YOU AND PACKET RADIO IN THE REAL WORLD BYBUCKROGERS,K4ABT ForThat QuantumLeap-TheAlincoDR-150T TNC The A/inco DR-ISOT TNC. SPECIFICATIONS OF THE ALiNCO DR-150T P acketredohaspropelledamateurradio into the era01computerswitha quantum leap, Because01thisrapidmoveintothe

2、world of digital communications, there are manynew amateurs entering thehobby lor the purpose ofusingthedigitalmodesthatmakeuseofthe computer and associated software. With the quantum leap comes the need for tasterdata rates. Thisneedin turn drives the requirement for broaderreceiverIF andfaster swi

3、tching (transmit push-to-talk to fullpower output) transceivers.Asa result of these re- quirements.manypacketeers are looking into transceiversthatwiltprovideboth voiceoper- ationandhigh-speedpacketuse. Ifyou arelookingfor atransceivertoaccess thelocalvoicerepealerandonewhichwillhan- dlethelargevari

4、etyofpacketapplications that exist-includingkeyboard-to-keyboard net- works, switches,nodes, OX spotting nets, BBSes, conference clusters-youcan find that happy balance in the AlincoDR-1SOT. With some of the packet applications Ive just mentioned the user canconnectto distant stations in other citie

5、s. states,andcountries using arrecom-oowertransceiver. There isno needforsuper-powertransceivers that run hundredsof watts. Thepowerlevel01the AlincoDR-l50Tallows the user to select the powerneededto make theconnectorcontact ranging from10to50 wattsoutput.This Alinco transceiver wasdesigned with the

6、 packeteer in mind. canexpectfrom the Alinco DR-l50T,Ive in- cludedthespecifications in TableI. Interfacing Your TNC To TheAlincoDR-150T Twelve-hundred baudmicpinconnections for the Alinco DR- 1SOTI/Oaresrownin TableII (alsoseefig.1). Interfacing the DR-1SOTtoa9600baudTNC ISsomewhat different fromth

7、eway in whiCh we connectthe DR-1SOTto a 1200baudTNC. In fig. 2 Ive Illustrated the backpanel of theDR- 150Ttoprovideadetailedlookat thetwojacks. Notice the9600bauddatajackis a 2.5 mil- limeter stereo jack, while the external speak- er jack is a 3.5 millimeter mono J ack, The 3.5 mmjacks are often ca

8、lled a1/8inch jack (or plug), The 3.5 mm plugs are easy to locate at any Radio Shack store. You maysoondiscov- er the 2,5mmstereo plug is a different story. Tocircumvent thisproblemImadeupthe interfacecableusing a 3.5mmstereoplugon theTX/Axconnection. Ipurchaseda 3.5mm to 2.5mmadaptertocompletetheco

9、nnection tothe DR-15OT9600bauddatajack. The adapter is available fromRadio Shack aspart The Best Is Yet To Come The DR-l50Tisengineeredtoprovidecon- mumaudiocharacteristics for the Markand Spacetonesol12OOand2200Hz(12OObaud). In addition. the DR-150T hasbeenengineered to transmitandreceive9600baud.

10、Thus, itcan beusedWIthbOth 1200and9600baudTNCs. Although It is not a requirement.one01the desired features in adata radio isthe time peri- odbetween when the TNC activatesPITand the level at which the transmitter reaches full outputpower, This iscalled TXDelay.Ideally, a50watt.9600baud transceiver s

11、hould have a TXDeiay of 20 or less. A TXDeiay of20 equatesto200milliseconds. or one fifth or a secondtrom thelimethePush-To-Talk (PIT) is activateduntilthetransceiver reaches the full50wattsofoutputpower_At fulloutput(or the TXOsetunq)the TNC applies thedata streamto the transmit FSK or AFSK line (t

12、rans- ceiverdata Input), As a matter of interest, Ive foundthat the DR-1S0T performs as well in9600baudpack- et operation as itdoeswith voiceapplications. Togive you a better understanding ofwhat you GENERAL Frequencycoverage AntennaImpedance Power requirements Receive current Transmit current Dimen

13、sions Weight TRANSMITTER Output Power Emission Mode Modulation Type Maximum Frequency Deviation Spurious Emission RECEIVER Receiver Type Modulation Acceptance Intermediate Frequency Sensitivity (12dBSINAD) Sensitivity(12dBSINAD) Selectivity Audio FrequencyOutput Tx=144.0c0-147,995 MHz Rx=108.0Cl0-1

14、73.995 MHz Rx=440.(X)-449995MHz SOOhmsunbalanced 138VOltsDC 0.6ampereapprcx. 10ampere(approx.) (not definedin US standard) (not defined in US standard) High=50, Medium=25.low=10 16F3 Reactance(true FM) % 5 kHz Notmore than-60oa Dual Conversion,Super Het. 16F3, F2. F3 45.1MHz and 455 kHz 2 mbandbette

15、r than 0.16 uV 70 embandbetter than 0.10 uV 12 kHz=-6 dB;= 1200BAUDMIC PIN CONNECTIONS Table11-Microphonepin connections for the Alinco oR-1S0TI/O,1200baud(also see fig, 1).Note:Ifhumornoiseisexperiencedonthe transmittedpacket signal, disconnect the shield connectionatthe TNCendofthe cable. Thegrayw

16、ire at pin8will provideground return for thePTTline; therefore no addition- algroundwires are necessary. NEW USRadiosnP1ua.-Granbouy,Tx.76048 2-Meter Mobile Transceiver )35t($289 Risk-FREETRIA 30DAY S Saveon - - ALL ftafl,eJhark Scanners;:;:.CALL1-800-433SAVEc.:. FREEs-o,_.-fri. TNC FUNCTION AFSK Ou

17、tput PTT Control RECEIVEAudio Shield/Ground PITGround PIN (micconnector) 1 2 6 7 8 thebesttransmit audio level setting for either 1200or9600baudis in the range of3,0to 3.5 kHz (SWing). Without exception, all TNCs have provisions within theircircuitrythatenable users to increaseordecreasethe level(s)

18、when necessary. It is advisable to know whichcom- ponent insideoroutside the TNC controls the TNCaudiooutput. IImaybenecessary10make an adjustmenttotheassociatedlevelcon- trohs.Remember:This is the exception.nol the rule, with1200baud. However, the level settingfOf9600baudtransmit audio is less for-

19、 giving. Until youexperiencepacketat9600 baud, youdontknowwhatyouatemissing Onceyouhave achieved thepropersettingtOf 9600baud,therest ispurepleasure. Formore informatiOn concerning the Alinco DR-l50T, contact Alinco Electronicsirc.438 AmapolaAve.,Unit 130,Torrance.CA90501 (phone310-618-8616; FAX 310

20、-618-8758). HappyPacketing deBucK4ABTWA4RTS.vAUSA number 274-373.Thedescriptiononthe Radio Shack blisterpackis HeadphoneAdapter- adapts 3.5mm(1inch) to 2.5mm(inch) Jacks. Before beginning the interfaceandsetup procedures which we willdiscussin the next portion of fhis monfhs column, I recommend fhat

21、 you read page63of the DR-15OTmanu- at.Reading the complete manual wit!allow you to familiarize yourself with the transceiverand will provide informationlorthe 9600 baud con- figuration, The DR-150T manual is a virtual storehouse ot information that applies to your new DR-150T voice and data radio,B

22、est of all, you will discover hundreds of wonderful fea- tures that are programmed into the micro- processorotthe DR-15OT. TransmittingPacket To operate a packet station you should have a current amateur radio license thatallows oper- ating privileges within the spectrumtowhich yourDR-l50Tis tuned.

23、Itthe interfacecablesare properlywired and connected, then you are ready to estab- lish contact with another packet station. It is wise to solicit help of another person who is already operating in thepacketmodes, espe- cially when operating at9600baud. Inthisway you will have someonewhocanlisten fo

24、r your signalanddirectyou to theoperatingfre- quencies thatareset aside for9600and/or 1200baudpacket. Although the DR-15OT isengineeredto make useoflimiting circuits that aredesigned topreventover-rrooutatco(deviatiOn), there aresomeTNeswhichmaydrivethe transmit audio circuitry too hard. An indicatiOn that a problemSUChas this is presentwouldbe noticed when accooectis triedtoa nearby packetstatenwith no results. Often toomuch transmit deviationcancause thesameorco- lamas not enough transmit audio. Ive found SayYouSawItInCOJuly1995CO95