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Elecraft • www.elecraft.com • 831-662-8345

ELECRAFT AT1 Step Attenuator

Assembly and Operating Manual

E740101: Revision A, September 7, 2006

Introduction

The Elecraft AT1 is a versatile and accurate HF/VHF step attenuator that permits selecting any level of attenuation between 0

and 41 dB in 1 dB steps. The AT1 features an unusually high upper power limit of 2 watts, making it ideal for many

applications where attenuators with a lower power rating cannot be used such as at the output of a QRP transmitter for QRPp

experimentation.

The AT1 step attenuator is designed to be used as a stand-alone unit. Optionally, it may be built into existing equipment or an

enclosure of your choice. See Assembly Options on page 2 for more information.

The AT1 uses no surface-mount technology, so it’s an ideal project for first-time builders.

Specifications

Size: 5-3/8” x 2-11/16” (13.7 cm x 6.8 cm)

Range: 0 to 41 dB in 1 dB steps

Accuracy: Below 50 MHz: ± 0.25+0.01(A) dB

54 to 200 MHz: ± 0.50+0.01(A) dB

Where A is the attenuation selected in dB

Tools Required

You will need the following tools to build this kit:

• Fine-tip soldering iron. Recommend a temperature-controlled soldering station with 700 to 800°F tip (370-430°C).

• IC-grade solder (Kester #44 or equivalent). Small diameter solder (e.g. .031”) is easiest to work with on small

printed circuit boards. DO NOT use acid-core solder, water-soluble flux solder, additional flux or solvents.

• Diagonal cutters.

• Needle-nose pliers.

Parts List

We recommend that you do a complete inventory before beginning assembly. The inventory helps you correctly identify all

the parts to avoid mistakes during assembly.

Identifying Parts

The resistors in this kit all have value stamped on their bodies. For example, a 39-ohm resistor may be stamped “39Ω”.

Others, like the 910 ohm resistors may be marked with numbers similar to color codes. For example, a 910-ohm resistor may

be marked “911” indicating 91 x 10 or 910 ohms. In those cases the numbers you should find on the part are shown in

parenthesis after the value. There will be other numbers and letters stamped on them as well. You can ignore them. As long

as you find the numbers given, you have the right part.

Reference. Designator Description Qty

Part

Number

Misc. AT1 Step Attenuator printed circuit board 1 E100309

J1, J2 BNC Connector, PC Mount 2 E620020

R1, R3, R4, R6 910Ω (911) 1W Resistor 4 E500256

R2, R5 5.6Ω (5R6) 1W Resistor 2 E500257

R7, R9 300Ω (301) 1W Resistor 2 E500258

1 2 3 4 5 6

Sommario

Pagina 1 - AT1 Step Attenuator

Elecraft • www.elecraft.com • 831-662-8345 ELECRAFT AT1 Step Attenuator Assembly and Operating Manual E740101: Revision A, Septe

Pagina 2 - Assembly Procedure

2 Reference. Designator Description Qty Part Number R8 18Ω (180) 1W Resistor 1 E500259 R10, R12 150Ω 2W Resistor 2 E500260 R11 39Ω (390) 2W Res

Pagina 3

3 Solder joints should be clean and shiny. If a joint appears dull or has fine cracks, it is probably cold. Cold solder joints should be cleaned and r

Pagina 4 - Operation and Applications

4 Table 1. Decibel Conversion. Ratio dB W E/I 1 1.3 1.12 2 1.6 1.26 3 2.0 1.41 4 2.5 1.58 5 3.2 1.78 6 4.0 2.00 7 5.0 2.24 8 6.3 2.51 9 7.9 2.82 10 1

Pagina 5 - Troubleshooting

5 example, if your transmitter is producing 1 watt and you select 6 dB of attenuation, the power you are feeding to the antenna is 1 watt divided by 4

Pagina 6 - Circuit Description

6 Circuit Description Refer to the schematic diagram below. There are six independent resistive attenuator networks. A pi-section circuit is used so t

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