Sonsivri
 
*
Welcome, Guest. Please login or register.
Did you miss your activation email?
December 06, 2016, 01:02:36 13:02


Login with username, password and session length


Pages: [1]
Print
Author Topic: OOK decoding, wrong polarity with very strong antenna signal  (Read 898 times)
0 Members and 1 Guest are viewing this topic.
flyback
V.I.P
Junior Member
*****
Offline Offline

Posts: 74

Thank You
-Given: 53
-Receive: 28


« on: May 05, 2009, 12:06:58 12:06 »

I am developping a receiver uising Philips (NXP) UAA3220, wired as a OOK superheterodyne receiver.
if the receiver is far enough from the transmitter, the digital decode output is OK.
When the receiver is at about 30..40cm from the transmitter, the RF frontend get overloaded, and there are no output signal.
When the receiver is at about 20cm, the output reappears, but in REVERSE polarity !!!
I don't figure what happens.
Normally, for a RF amplifier, we must reach a compression point in overloaded condition. Is it possible that, for heavily overloaded condition, the gain decreases with the increase of input signal?


.
Logged
Manuel
Junior Member
**
Offline Offline

Posts: 94

Thank You
-Given: 80
-Receive: 62


« Reply #1 on: May 05, 2009, 01:40:04 13:40 »

Probably U mean AGC.
Yes it's possible, but a specific design have to be drawn.
I'd say you are having saturation problems now.
X
Logged

-> An Apple a Day does not Let U become a Macintosh!
Pages: [1]
Print
Jump to:  


DISCLAIMER
WE DONT HOST ANY ILLEGAL FILES ON THE SERVER
USE CONTACT US TO REPORT ILLEGAL FILES
ADMINISTRATORS CANNOT BE HELD RESPONSIBLE FOR USERS POSTS AND LINKS

... Copyright 2003-2999 Sonsivri.to ...
Powered by SMF 1.1.18 | SMF © 2006-2009, Simple Machines LLC | HarzeM Dilber MC