amy@lecce status
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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
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