Dentron DTR-2000L User Manual-signed
Contents
1. cable 5 Connect the DTR 2000L ALC output to the transmitter ALC input using shielded cable Check your Transmitter Manual to make sure that it is compatible with negative going ALC 6 Position the DT R 2000L front panel switches as follows PWR OFF STDBY OPERATE STANDBY CW SSB CW 7 Insert the AC plug on the DTR 2000L power cord into the appropriate AC outlet 8 Turn the main power switch on Plate voltage should read approximately 1800 V DC on meter 9 Allow approximately 3 minutes and the ready light will come on indicating that the DTR 2000L is ready to tune FROM THIS POINT ON EXERCISE CARE AND FOLLOW THE PROCEDURES CAREFULLY FROM THIS POINT ON EXERCISE CARE AND FOLLOW THE PROCEDURES CAREFULLY 160 M through 40 M Set the load control at 1 on the scale 20 M through 15 M use 3 on the load scale Set the tune control and band switch to the band being tuned Tune exciter to your input power that is normally used Now decrease output of exciter to achieve 50 Watts Use carrier drive control Tune DTR 2000L for maximum output in CW position on a wattmeter such as the DenTron W 2 Watt meter 1 KW DC input will not be achieved at this point Increase drive level control and retune ampli fier until 1 KW DC input is achieved NOTE Check the position of the CW SSB switch to make sure it is in the CW position Recheck DTR 2000L tuning and exciter tuning using the following example Current x Vol2. 000 pf 5 KV C16 C17 200 pf 5 KV C18 250 pf Variable C21 800 pf Variable OG N 100K 2 W POT R3 R4 27K 2W m o o O gt 3 N z R6 R7 R8 1 Meg 5 W 1 R9 R10 R11 R12 R13 R14 R15 R16 R17 100 K 2 W R18 Factory Made Meter Shunt 133 Ohms C Factory Made Toroid Rfc Rfc 2 Rfc 3 Factory Made Plate Choke Rfc 4 2 5 Mh Rfc Rfc 5 8 5 uh Choke t L2 Factory Wound Tapped Loading Coils Parasitic Choke 4 T 18 Wire on R5 zu x K1 K2 12 V Cont Relays SW1 SW2 SW4 SPST Rocker Sw SW3 5 Pos Band SW 41 42 J3 JA SO239 Coax Connector RCA Connector INDICATORS 11 12 13 14 15 I6 17 12 V Lamps 382 M1 M2 0 1 ma Meters TRANSFORMER d Dual Primary 117 234VAC Triple Secondary 600V amp 900V HV 5V Fil 12V Control BLOWER B1 117 VAC 75 CFM Fan D1 D16 D17 D18 1N4007 z A 7 DIET diis o D3 1N3308 a URES T EN D4 through D15 Silicone H V Diode TOO0V PI Amp nu E Factory Made Matching Ckt Line Fuse 30 Amp at 117 VAC and 15 Amp at 234 VAC fae REA RE TE OPERATE oh c3 WWW AMPLADY COM DENTRON DTR 2000L AMP a we Mate T ohangi peim RIII Z4 OC Kemsce es Ae 7f it on et Kon San AMA mat S Thau WWWAMTLADYCOM Cee pe lt
3. WWWAMPLADY COM Scanned by TA2ST Introduction The DenTron DTR 2000L Linear Amplifier is a conservatively designed 2000 Watt PEP 160 15 meter amplifier of unique design Through years of designing linear amplifiers DenTron Radio has greatly simpli fied the circuitry of the DTR 2000L building in years of reliability based on the experience of our world famous MLA 2500 series The incorporation of a single 8877 a tube till now used almost exclusively in broadcasting applications makes the DTR 2000L a no compromise unit featuring the most powerful final tube rating allowed under current FCC regulations 1500 Watts plate dissipation The DTR 2000L has been fully tested at the maximum legal Amateur power limit on all modes SSB CW SSTV RTTY as well as under contest conditions The unit covers all the Amateur Bands from 1 8 to 21 450 MHz along with most MARS operating frequencies without modifications With factory modifica tions the DTR 2000L will operate on any frequency from 1 8 to 35 MHz strictly for commercial applica tions A single 8877 external anode ceramic metal triode is used in the DT R 2000L operating in grounded grid A built in continuous duty power supply completes the unit capable of either 117V or 234V operation although 234V line voltage is recommended Cooling of the unit is accomplished through an EIMAC speci fied pressurized chamber and chimney A vacuum impregnated power transformer hi lo power switching dua
4. es through two 01 disc ceramic capacitors C6 amp C7 to cathode of the 8877 tube Cathode bias is controlled by R1 in standby or D2 or D3 depending whether you re operating SSB or CW CW is 24 volt zener SSB is 8 9 volt zener This is done through K1 and K2 relays The grids of the 8877 tube are grounded directly through clips mounted inside the tube box Output of the 8877 tube passes through a parasitic choke to C15 B is applied to tube through a two stage plate choke circuit RFC2 RFC3 C13 and C14 Amplified signal goes to a highly efficient pi network tank circuit consisting of C18 L1 L2 and C21 There is only added capacitance on the tune and load controls for 160 meter operation ALC is obtained from the cathode of the 8877 tube through C8 and C9 The polarity of the ALC circuit is set by D1 As shown in the schematic ALC is negative going in the DTR 2000L If positive ALC is re quired reverse diode D1 Warning IF ANY PROBLEMS OCCUR THAT ARE NOT EASILY REPAIRED IN THE FIELD PLEASE CONTACT DENTRON RADIO COMPANY FOR TECHNICAL ASSISTANCE WWW AMPLADY COM Specifications Frequency Ranges 160 Meter Band 1 8 2 5 MHz 80 Meter Band 3 45 4 6 MHz 40 Meter Band 6 00 9 0 MHz 20 Meter Band 11 00 16 00 MHz 15 Meter Band 20 95 23 50 MHz The DTR 2000L will cover most MARS frequencies just outside the Amateur Bands With proper FL1 and band switch modification the unit will also cover the 10 meter amateur ba
5. ge and return it to DenTron Do not destroy the packing material since it will be usable later should you require factory service or wish to transport the amplifier for any other reason In general the location of your DTR 2000L is not critical as long as you make sure that there is adequate air flow at the back top and sides of the case Fresh cool air enters from the back through the fan and exhaust through the top and sides of the cabinet Warning MAKE NO ATTEMPT TO PUT THE AMPLIFIER IN SERVICE OUTSIDE OF THE CABINET CON TACT WITH VOLTAGES IN THIS AMPLIFIER CAN BE FATAL WWW AMPLADY COM Tube Installation Warning MAKE NO ATTEMPT TO PUT THE AMPLIFIER IN SERVICE OUTSIDE OF THE CABINET CON TACT WITH VOLTAGES IN THIS AMPLIFIER CAN BE FATAL Make sure that the AC power cord is not plugged into an AC source before going on Remove the top cover of the DTR 2000L with three screws on both upper sides Unpack the 8877 tube and inspect it mak ing sure all pins are striaght and there is no shipping damage Align the 8877 pins with the tube socket with the large pin oriented nearly straight up and carefully insert If too much resis tance is felt remove the tube and check for bent pins E SU After mounting the 8877 in its socket in a WW spect the teflon chimney and mounts to y make sure they are mounted solidly 1 Install the plate cap connector and carefully tighten the clamp screw Caution D
6. l meters for monitoring plate voltage and current and modular construction complete the DTR 2000L package Please be certain to completely read this manual before operating your new DTR 2000L U S Amateur regulations limit the use of high powered amplifiers such as the DT R 2000L to licensees of General Class or higher WWW AMPLADY COM Theory of Operation After the DTR 2000L is hooked up to an AC power source and turned on power is applied to the power transformer This applies power to the Amperite tube which keeps the unit from being keyed for 3 minutes Also power is supplied to the B and 12 volt sections of the unit The B section is a standard voltage doubler the only difference being that the transformer has a tap for SSB which is highest voltage and CW which is about 30 less These two voltages are selected from relay K2 Relay K2 also selects the appro y priate zener diode for SSB or CW operation Plate current is measured across B to ground through R18 voltage is measured through R6 R7 R8 and R9 to ground SSB is about 2700V DC and CW is about 1800V DC After the ready lamp is lit control of the unit is accomplished through the standby switch on the front panel A path to ground is required for keying the amplifier Signal is applied to J2 and passes to J1 through K1 if the unit is in standby If the unit is out of standby signal goes from J2 through FL 1 matching device to J5 on the tube box Now the signal go
7. nd Modes USB LSB CW RTTY SSTV Power Requirements 234 117 VAC 50 60 Hz RF Drive Power 125 Watts maximum and 65 Watts RMS minimum for 1 KW DC input DC Plate Voltage SSB Idle 2500V approximate CW Idle 1800V approximate Duty Cycle 100 SSB CW RTTY SSTV Input Impedance 50 Ohms nominal Input VSWR 1 5 to 1 average Output Impedance 50 Ohms nominal Antenna load VSWR 3 to 1 maximum ALC negative going adjustable from rear panel Spurious Emissions IMD greater than 30 db down Harmonics greater than 40 db down FCC Type Accepted Size H 74 x W 14 x D 14 Weight including 8877 54 pounds Warning TO TAKE FULL ADVANTAGE OF THE DTR 2000L COOLING SYSTEM IT IS HIGHLY RECOM MENDED THAT THE UNIT BE RAISED UP WITH THE PROVIDED BAIL UNDER NORMAL OPERATING CONDITIONS WWW AMPLADY COM Cautions 1 Make no attempt to put the DTR 2000L in service outside of the cabinet Contact with voltages in this Amplifier can be fata to the human body 2 Never attempt to operate the DTR 2000L with drive power of more than 125 Watts 3 Never attempt to operate the DTR 2000L without first connecting it to an antenna with an SWR of less than 3 1 or a 50 Ohm dummy load of sufficient power handling capacity or serious damage may result to the amplifier 4 Do not under any circumstances operate the DTR 2000L from a 117V lighting circuit because the cir cuit conductors are not large enough to safely carry thi
8. o not overtighten Unpack and inspect the Amperite time de lay relay Align the time delay tube pins with the socket and carefully insert Reinstall the DTR 2000L top cover and T proceed to the next set of instructions Warning NEVER ATTEMPT TO OPERATE THE DTR 2000L WITHOUT FIRST CONNECTING IT TO AN AN TENNA OR 50 OHM DUMMY LOAD OF SUFFICIENT POWER HANDLING CAPACITY OR SERIOUS DAMAGE MAY RESULT TO THE AMPLIFIER WWW AMPLADY COM Installation Instructions Tune up Procedures The DTR 2000L is factory wired to operate from 234 AC nominal at 15 amps If 117AC is used you will have to rewire the terminal block per the schematic diagram and install a 30 AMP 250 V fuse See the DT R 2000L Schematic for attaching a plug to the line cord 117 VAC operation is not recommended unless you have an independent 117 V line with at least a 30 AMP breaker or fuse in the service box For 117VAC change over see page 8 TRANSCEIVER 1 Position the DTR 2000L in such a way that the rear sides and top of the unit are clear of all obstruc tions This will assure adequate air circulation which is a must 2 Connect a known 50 Ohm load to the antenna jack using RG8 or equivalent type coax The safest load is the DenTron Big Dummy etc 3 Connect the DTR 2000L keying lead to your transmitter using shielded cables See your Transmitter Owner s Manual 4 Connect the R F input jack to the transmitter output using 50 Ohm coax
9. s load 5 Never run Amplifier from an extension cord 6 Do not attempt to change jumper connections on back of the Amplifier without first removing power plug from the DTR 2000L 7 Do not cover the top of the DTR 2000L with books papers or other pieces of equipment or overheating may result 8 Do not use different tuning procedures other than indicated in this manual 9 When cleaning the DTR 2000L never blow high pressure air directly into the fan blades Spinning the fan at higher speeds than it was designed for can cause damage and freeze the rotor assembly of the fan Use brush in cleaning fan assembly Warning DO NOT SHIP YOUR UNIT WITH THE 8877 TUBE INSTALLED BE CERTAIN TO PACK THE 8877 TUBE SEPARATELY Operating Features 1 Continuous monitoring of D C plate voltage and D C plate current via two front panel meters 2 Standby operate switch 3 CW SSB power switch to provide maximum operating efficiency at 1 KW and 2 KW PEP input to ampli fier 4 Mandatory 3 minute warmup for long tube life 5 8877 EIMAC triode rated at 1500 Watts dissipation yields a comfortable safety margin and insures maxi mum tube life Unpacking Instructions Carefully remove your DTR 2000L from its packing carton Make sure there is no damage from shipping If there is any evidence of damage notify the delivering shipper fully describing the damage Fill out the DenTron Registration Card included in the information packa
10. tage Power Ex 1500 x 666 ma 1000 Watts DC input When you have completed Step V and reached the 1 KW DC input level unkey the transmitter The DT R 2000L will be delivering approximately 600 Watts of power out For SSB operation you need only put the CW SSB switch in the SSB position and select proper side band on your exciter NOTE For best efficiency and lowest distortion you should load your transmitter as heavily as you normally would and retune the DTR 2000L to maintain 1 KW input The DTR 2000L will accept up to 125 Watts PEP of drive without distorting or generating unwanted outputs Remember 1 KW is the legal input power limit Warning NEVER OPERATE THE DTR 2000L IN SSB WITH SWITCH IN CW POSI TION FOR RTTY AND SSTV USE DTR 2000L IN SSB POSITION ONLY WITH APPROXIMATELY 600 WATTS OUTPUT NO MORE 234 Volt Operation 117 Volt Operation White AC Cord 2 Black 1 Green Pins 2 to 4 Pins 3 to 4 3to5 WN White 1 side of 234V 117V Black other side of 234V 117V Green Ground of SOPR P bs o WWW AMPLADY COM AA WWW AMTLADY COM DTR 2000L Parts List PART NO DESCRIPTION VN EIMAC 8877 Triode TD Amperite 3 Min T D Relay CAPACITORS C1 C2 C3 C5 C6 C7 C10 C12 C42 C43 C44 C45 C46 and C22 through C33 01 Disc 1 KV C8 C9 47 pf S M C4 C48 C11 001 F T Caps C34 through C41 150 uf at 450 VDC C13 C14 C20 500 pf 20 KV C47 600 Uf at 25 VDC C15 C19 1
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