AT35-PA - Attenuator ATLAS - Free user manual and instructions

Product Type	Attenuator
Brand	ATLAS
Model	AT35-PA
Attenuation Range	0 to 35 dB
Attenuation Steps	1 dB increments
Frequency Range	DC to 1 GHz
Impedance	50 ohms
Power Handling	2 Watts CW
Input Connector	Type N Female
Output Connector	Type N Female
Dimensions (L x W x H)	120 x 60 x 30 mm
Weight	250 g
Power Supply	Passive (no external power required)
Main Functions	Signal level reduction, impedance matching, signal isolation
Maintenance	Wipe with dry cloth; avoid solvents; keep connectors clean
Safety	Do not exceed maximum input power; use proper cables
Spare Parts & Repairability	No user-serviceable parts; contact ATLAS service for repairs
General Information	Designed for laboratory and test equipment use; compact metal enclosure

Frequently Asked Questions - AT35-PA ATLAS

What is the maximum input power for the AT35-PA?

The AT35-PA can handle up to 2 Watts CW (continuous wave) without damage. Exceeding this may cause permanent failure.

What connectors does the AT35-PA use?

It uses Type N Female connectors on both input and output, providing reliable RF connections up to 1 GHz.

Can I use the AT35-PA for audio signals?

It is optimized for RF signals (DC to 1 GHz) and a 50 ohm system, so it is not suitable for typical audio applications.

How do I set the attenuation value?

The AT35-PA uses rotary or slide switches (depending on version) to select attenuation in 1 dB steps from 0 to 35 dB.

Does the attenuator require external power?

No, it is a passive device and does not need any power supply. It works purely on signal attenuation.

How should I clean and maintain the AT35-PA?

Clean the exterior with a soft dry cloth. For connectors, use compressed air or a lint-free swab with isopropyl alcohol. Avoid abrasive cleaners.

What is the frequency response of the attenuator?

The specified frequency range is DC to 1 GHz with flat attenuation within ±0.5 dB across the band.

Can I repair the AT35-PA myself?

The device contains no user-serviceable parts. Please contact ATLAS support or an authorized service center for any repairs.

What is the impedance of the AT35-PA?

It is designed for 50 ohm systems. Using it in a different impedance system may cause mismatch and inaccurate attenuation.

How accurate is the attenuation setting?

The typical accuracy is ±0.2 dB from DC to 500 MHz and ±0.5 dB up to 1 GHz, depending on the step.

USER MANUAL AT35-PA ATLAS

Attenuator Installations

Wiring

Each terminal will hold up to 2-16AWG stranded wire. For larger wires or home run situations, a small length of wire and a wire nut are recommended. Attach wire according to label on terminal block as shown to the right (Non-PA Models will not have the "VDC+" and "VDC-" terminals).

*Install the unit with the terminal block on top. This will ensure that the OFF position is in the bottom.

(-PA) PRIORITY ATTENUATORS

Schematics for Priority Attenuators Power Switching Req. for -PA Attenuators

graph TD
    A["TO RELAY POWER"] --> B["BLACK"]
    A --> C["WHITE"]
    A --> D["BLUE"]
    B --> E["ATTENUATOR"]
    C --> E
    D --> E
    E --> F["GREEN"]
    G["TO AMP OUTPUT"] --> H["RED"]
    I["LEARN"] --> J["LEARN OUT"]
    K["LEARN OUT"] --> L["LEARN OUT"]

Wiring Requirements: (1) Pair for Audio, (1) Pair for Relay

Use 2nd external relay when paging switch is part of a paging microphone. This will reduce hum and noise pickup from the mic.

Relay Specifications:

Coil Voltage: 24 VDC Coil Current: 10MA

Contacts: SPDT-2Amp Rating

Relay has a protective cover.

(-RM) Rack Mount

Drill holes in panel using the template to the right. Peel off adhesive backing on escutcheon overlay. Align hole openings with holes in panel and affix to surface. Remove knob and nut from attenuator. Insert bushing through large hole in panel making sure that the small indentation on the bracket lines up with the small hole in the panel. Fasten attenuator to panel with the nut. Fit attenuator knob on shaft. Tighten screw on knob to secure.

Dimensional Specifications

-RM Models supplied without a faceplate. All other models supplied with a single faceplate. Double gang stainless steel faceplate can be ordered separately.

Model A B C
AT10 2	^1/_8" (54mm) 2	^3/_4" (70mm) 1	^3/_4" (45mm)
AT35 2	^1/_8" (54mm) 2	^3/_4" (70mm) 1	^3/_4" (45mm)
AT100 2	^1/_2" (64mm) 2	^3/_4" (70mm) 1	^3/_4" (45mm)