Ten-Tec 1215 Kurzanleitung

MODEL 1215

ANTENNA TUNER KIT

ASSEMBLY & OPERATIONAL MANUAL

Release “B” 6/28/11

1 1215 Antenna Tuner Manual Part # 74449

2 1215 Antenna Tuner Manual Part # 74449

TABLE OF CONTENTS

NOTE: This manual is divided into two sections, the “Reference Section” which covers the

meter's specifications and general information and the “Assembly Section” which covers the

actual assembly and check-out of the kit. The “Assembly Section” is last since it will seldom

be referenced after the wattmeter is built and tested for the first time. The “Reference

Section” is essentially the owner's manual for the completed unit.

•REFERENCE SECTION

◦Tuner Specifications

◦General Introduction

◦Circuit Overview

◦Schematic Drawing

◦Parts List / Bracket Drawings

◦Operating Tips

◦Troubleshooting Chart

◦Optional Balun for Balanced Feeders

•ASSEMBLY SECTION

◦Kit Assembly Suggestions

◦Required Tools & Supplies

◦Getting Started

◦Phase I: Assembly of Rotary Inductor (L2)

◦Phase 2: SWR Bridge Circuit Board Assembly

◦Phase 3: Meter Switch & SWR Set Pot Assembly & Wiring

◦Phase 4: Antenna Switch Wiring

◦Phase 5: Chassis Assembly & Wiring

◦Phase 6: Wattmeter Calibration and Checkout

3 1215 Antenna Tuner Manual Part # 74449

MODEL 1215 TUNER SPECIFICATIONS

CIRCUIT TYPE: High Pass “T” Network

RF POWER RATING: 200 Watts maximum

FREQUENCY RANGE: 1.8 – 30 MHz

WATTMETER RANGES: 20 Watts, 200 Watts

OUTPUT MATCHING RANGE: SWR up to 10:1

INPUT IMPEDANCE: 50ΩResistive when tuner properly matched

CAPACITOR RATING: 10 - 210 pf @ 1000 Volts

INDUCTOR: Toroidal rotary, 0.2 – 18 uH

DC POWER SOURCE: 12 – 16 Volts @ 150 ma (for meter illumination)

ENCLOSURE SIZE: 9.5”W x 4.2”H x 5.5”D

(with knobs & connectors, the overall depth

is approximately 7.25”)

WEIGHT: 3.5 lb (1.8 kg)

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GENERAL INTRODUCTION

The Model 1215 is a full featured antenna tuner designed for the ham operator using

transmitters or transceivers from QRP through 200 watts. A wide matching range combined

with an integral wattmeter and SWR bridge provides all the necessary capabilities to ensure

efficient operation with minimal RF losses due to impedance mismatches between the

feedline and radio. Up to four antennas can be selected via a front panel switch. One of

those antennas can be a single wire antenna and provision has been made to add an internal

balun for connecting to balanced feedlines.

Our goal is to provide the builder with the satisfaction of “doing it yourself” and, in the process,

furthering his or her understanding of the circuit operation. Understanding the circuit

operation removes much of the “mystery” often encountered in adjusting an antenna tuner.

Follow the assembly instructions carefully and you will be rewarded with an antenna tuner

with professional performance and appearance. Should you have any questions, Ten Tec

Customer Service is available to help.

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CIRCUIT OVERVIEW

1215 BLOCK DIAGRAM

SWR BRIDGE

The internal SWR bridge is physically connected between the tuner input and the radio. The

bridge performs three functions:

1. Measures transmitter output (forward) power

2. Measures the reflected power at the tuner input (“Radio”) port

3. Displays the SWR on the built-in meter

The SWR measurement setting is used when adjusting the tuner for optimum performance.

In this mode, the tuner is adjusted to produce, ideally, a 1:1 SWR as seen by the radio.

The bridge consists of an RF transformer, wound on a toroidal core, with the main

transmission line passing through it. This allows sampling both the forward and reflected

power levels present at that point. The outputs from the transformer are detected by two

Schottky diodes, D1 and D2, and the DC voltage produced is used to drive the meter to

display either the forward or reflected power. When the tuner properly matches the antenna

system to 50Ω, the reflected power reading will be zero.

In the forward power measurement mode, a potentiometer is connected in series with the

meter to display either 20 watts or 200 watts full scale. Once calibrated, the pots should need

no further adjustments.

Since SWR is a measurement of the ratio of forward to reflected power, an “SWR Set” control

is included on the front panel of the tuner. With the transmitter operating at it's desired power

level, the meter is placed in the SWR Set mode and the Set pot is adjusted for a full scale

6 1215 Antenna Tuner Manual Part # 74449

SWR

BRIDGE

“T” MATCHING

NETWORK

BYPASS

ANT #1

ANT #2

ANT #3

ANT #4

SINGLE WIRE

OPTIONAL

BALUN

BALANCE

LINE

reading. The switch can then be changed to the “SWR” setting and the value of SWR read

directly. If the output power level is changed, the “Set” pot will need to be readjusted to

maintain an accurate SWR reading.

ANTENNA SELECTION

The antenna tuner is equipped with a five position antenna selector switch. In the first

position, BYPASS, the output of the SWR bridge is connected directly to Antenna Connector

#1. This keeps the power and SWR measurement circuitry active, but bypasses the tuner

circuitry. Note that the bypass position only functions for antenna #1.

In positions 2 through 5, the tuner is connected to antenna ports #1 to #4 in sequence. To

connect a single wire antenna to the tuner, use the insulated terminal indicated on the rear

panel. The antenna switch must be set to Antenna #4 for the single wire feed. To connect the

tuner to an antenna with a balanced feed i.e., ladder line, a balun (balanced to unbalanced

transformer) is required. The 1215 does not come equipped with a balun, however there are

feed through posts on the rear panel which will allow a balun to be mounted internally and it's

connections brought out through the rear panel. A jumper (supplied) between the “Single

Wire” and “Balanced Feeder” post needs to be installed when a balun is being used. As with

the single wire feed, the tuner must be set for Antenna #4 when using the balun. The

“Balanced Feeder” jumper should be removed if Antenna #4 is being used for a coaxial or

single wire antenna feed. Ten Tec offers an internal balun as an accessory for the 1215 tuner.

The model number for that balun is 1216. As an alternative, information on building a balun

can be found in the “Optional Balun” section of this manual or any recent edition of the ARRL

Antenna Book. A web search with the keyword “4:1 balun” will provide many references for

building a balun for tuner applications.

ANTENNA TUNER CIRCUITRY

The antenna tuner is a high pass “T” network with two series variable capacitors and a shunt

variable inductor connected between them and ground. This configuration allows a wide

range of impedances to be matched to the 50Ωoutput impedance of the radio. This

configuration is fairly easy to tune if the proper procedure is followed. The tuning procedure is

outlined in the “Operating Tips” section of the manual.

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8 1215 Antenna Tuner Manual Part # 74449

1215 ANTENNA TUNER PARTS LIST

9 1215 Antenna Tuner Manual Part # 74449

PART # DESCRIPTION QTY

CHASSIS ASSEMBLY

23227 Cap, Air Variable 2

27007 Lamp Socket, Bayonet 1

30894 10k Panel Mount Pot 1

32077 Rotary Switch ; 3 Pole / 4 Position 1

32098 Rotary Switch ; 2 Pole / 5 Position 1

34011 Pilot Lamp ; Bayonet Base 1

34043 Panel Meter 1

34070 Knob - “Meter Switch” & “SWR Set” 2

34071 Knob - “Antenna Switch” & “Inductance” 2

34072 Knob - “Transmit Match” & “Load Match” 2

35007 SO239 Coax Receptacle 4

35132 DC Power Jack ; 2.1mm 1

35402 DC Power Plug ; 2.1mm x 5.5mm 1

42010 Panel Bushing - “Ant Switch” & “Inductance” 2

46010 Wire, Hookup, #24 Black Stranded 24”

46011 Wire, Hookup, #24 Brown Stranded 15”

46012 Wire, Hookup, #24 Red Stranded 15”

46013 Wire, Hookup, #24 Orange Stranded 12”

46015 Wire, Hookup, #24 Green Stranded 15”

46016 Wire, Hookup, #24 Blue Stranded 12”

46018 Wire, Hookup, #24 Grey Stranded 24”

46019 Wire, Hookup, #24 White Stranded 24”

46057 Wire, Hookup, #24 White / Yellow Stranded 12”

46059 Wire, Hookup, #24 White / Blue Stranded 6”

90681 Nylon Feed-Thru Insulator 6

91217-6 Phenolic Shaft 1

91482 Shaft Coupler – 1/4” 1

93946 Flat Jumper for Rear Panel 1

80925 INDUCTOR SUB-ASSEMBLY

38060 C Ring 1

77001 Copper Braid ; 3/16” Wide 4.8”

80924 Inductor Mount Bracket Assembly 1

21045 Toroid Core – Ferrite (large) 1

46076 #18 Solid, Silver Plated Wire 15 ft

90682 Toroid Bottom Cover 1

90683 Toroid Top Cover 1

90677 Rotor 1

90679 Hub 1

90690 Contact Stiffener 1

90691-1 Modified Contact 2

91369 Aluminum Inductor Shaft ; 1/4” Dia 1

PARTS LIST (CONTINUED)

10 1215 Antenna Tuner Manual Part # 74449

PART # DESCRIPTION QTY

82062 SWR BRIDGE SUB-ASSEMBLY

21003 Toroid Core – Ferrite (small) 1

21007 1mH Inductor 1

23261 Ceramic Capacitor – 0.1uF 2

23371 Ceramic Capacitor – 10pf / 1kv 1

23400 Ceramic Capacitor – 470 pf / 100V 1

28071 Schottky Diode – BAT41 2

30082 1

30136 1

30806 1K Variable Resistor (Pot) 2

35007 SO239 Coax Receptacle 1

46022 Wire, Solid #28 Red 18”

46070 Wire, Solid #28 Green 18”

82080 PC Board Assembly 1

MECHANICAL PARTS

41011 #10 Solder Lug 4

41039 #4 Solder Lug ; internal tooth 3

42003 Rubber Mount Foot 4

51002 #4 Lockwasher 15

51007 #10 Flat Washer ; 7/16” OD 11

51011 Fiber Shoulder Washer ; 5/8” 4

51034 #10 Lockwasher 4

51039 3/8” Flat Washer 4

54002 4-40 Hex Nut 15

54003 3/8”x32 Hex Nut 4

54005 10-32 Hex Nut 4

54016 Self-Threading Nut 1

54017 10-32 Wing Nut 4

54029 2-56 Hex Nut 4

54048 Metric M9 x 0.75mm Nut 1

60001 4-40 x ¼” Screw 2

60003 4-40 x 3/8” Screw 7

60035 10-32 x 3/4” Screw 1

60036 10-32 x 1-1/4” Screw 3

60067 2-56 x 1/4” Screw 4

60069 4-40 x 3/8” Screw w/captive lockwasher 10

60080 4-40 x 3-16” Flat Head Screw 8

60092 Screw, 6-32 x 3/16”, Black 2

65009 #4 x 1/4” Pan Head Screw 2

93954-CN2A Chassis 1

93955 Cover 1

93956 Meter Support Bracket 1

93957 Antenna Switch Bracket 1

68Ω2W Resistor (blue-gray-black)

680Ω1/4W Resistor (blue-gray-brown)

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