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ATT-20 Variable Attenuator
ATT-20 Variable Attenuator

MSRP: $59.95
Our Price: $49.95
You Save: $10.00

Stock Status: In Stock

Product Code: 24-531021


ATT-20 Variable Attenuator
useable frequency range: 0,1 - 1000 MHz
attenuation: 0 to 20dB continuously variable
control: 3 turns of the knob for the range 0 to -20dB
insertion loss at 0dB stop: less than 0,2dB
no intermodulation - passive
input connector: BNC/f
output connector: BNC/m
input/output impedance: 75 Ohms
size: 18,5 x 34 x 70 mm
weight: 35 g

This device provides a variable fine control attenuation in a very wide frequency range. It utilizes a quality Piher attenuator with the range from 0 to 20dB. Zero attenuation corresponds to the clock-wise stop and maximum attenuation to the anti-clock-wise stop of the control knob.

This attenuator can effectively reduce or eliminate intermodulation resulting from strong signals at the input of a receiver/scanner. Compared to the internal attenuators in the receivers/scanners which are fixed 10 or 20dB, this allows the user to precisely set just the minimum necessary attenuation that will eliminate the intermodulation (this can only be several dBs) while not sacrifising the receiver's sensitivity.

It is a useful accessory for all hand held and table top scanners (Yupiteru, Alinco, AOR, ICOM, YAESU, Uniden-Bearcat etc.). Its BNC coax connectors simply fit onto the antenna input connector and the antenna is connected to the BNC connector of the attenuator. The filter finds its use at places with strong broadcast signals from LW, MW and SW bands and especially from VHF FM band. These signals very often cause overloading of the receiver front end and hence significant deterioration of sensitivity.

The input and output impedance of 75 ohms remains constant over the whole frequency range and attenuation range and for reception purposes present neglieable SWR of 1,5 with 50 ohm systems. The input and output are galvanically isolated.

Average Customer Review: Average Customer Review: 4 of 5 4 of 5 Total Reviews: 1 Write a review.

  1 of 1 people found the following review helpful:
4 of 5 Does the Job - Build Quality not the best. February 16, 2017
Reviewer: HTH  
A previous review mentions it does not work, however, mine does work. It seems to do the job, so I am happy with it. One thing to note, the build quality is not very good, but adequate, hence the 4 star rating. I would not want to drop it on say a tile or hardwood floor, for fear of it breaking. It's smaller than I thought. It's not built like a PAR filter, which is built like a battleship, but PAR does not make a variable attenuator. This device is effective on my Yaesu VR-5000, which has a poor front end, and sometimes needs more attenuation than it's built in attenuator.

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