AMY Meeting. 25 Feb 2011

AMY@Lecce Status.

AMY Meeting. 25 Feb 2011

AMY- First tests in Lecce AstroParticle Lab

Signal Generator R&S SMB100A 9kHz to 3.2GHz

The Signal Generator is optioned with Pulse Modulator and Generator, that allows to pulse inside a gate signal (Δt min = 10 ns)

Power Detector ZX47-60-S+ containing AD8318

From Data Sheet

Rise Time 400nsec / Fall Time 10 nsec

(from -60 dBm to +5 dBm)

A simple setup just to start…

AMY Meeting. 25 Feb 2011

Power Detector(ZX47-60-S+) Time response

• Signal Pulse Width from 10 nsec to 200 nsec• 2 different frequencies (1.7 GHz and 2.6 GHz) • 2 different signal amplitude (-40 dBm and -60 dBm)

INPUT Signal

OUTPUT Signal ( V measure on the scope)

The power detector seems fully efficient only for signals having a pulse > 100 nsecA similar temporal behaviour on rise/fall.

• Time is much longer then specifications

OPEN Questions

AMY Meeting. 25 Feb 2011

INPUT Signal• Signal Pulse Width 100 nsec• scan in frequencies: from 0.3 GHz to 3 GHz• scan in signal amplitudes: from -90 dBm to -30 dBm

noise level

The power detector is sensitivefor signal levels > -65 dBm.

In agreement with datasheet (from -60 dBm to +5 dBm)

The signal output varies with RF frequency:Power Detector-Sensible range: 1MHz-8GHz

AMY Meeting. 25 Feb 2011

LNB S-Band

AMY Meeting. 25 Feb 2011

LNB- Sensitivity to signal levelsaround -80 dBm

AMY Meeting. 25 Feb 2011

Trying to improve the signal/noise ratio

AMY Meeting. 25 Feb 2011

Amplifier+PowerDetector

Introducing an amplifier.

AMY Meeting. 25 Feb 2011

First tests on transmission-reception.

≈500 MHz dipole.

AMY Meeting. 25 Feb 2011

• Carlo has realized a small antenna for feeding the LNB.

• Small acquisition set-up (eventually for acquiring directly

the LNB (around 1 - 3 GHz). • Investigating other Power Detectors and/or different

evaluation boards. • 2 more from AD as the one we have in order to

modify the board• Power Detector from Maxim with larger dynamic

range (home made evaluation board) • Trying to understand the time response• FADC-> requested funding (answer 11 March)• More LNBF on different bands (C, Ku). No way to test

on this bands apart noise