[Discuss-gnuradio] Question of tx_ampl range: [0, 1) or [0, 2^15/2) ?
From:
Rachel Li
Subject:
[Discuss-gnuradio] Question of tx_ampl range: [0, 1) or [0, 2^15/2) ?
Date:
Mon, 8 Nov 2010 00:56:36 -0500
Hi All:
I am trying to set a proper pair of tx amplitude and rx gain, but found something confused.
In transmit_path.py ( ..-> packet_transmitter -> Multiply Const -> USRP Sink), I see that the range of Multiply Const is [0, 1).
However, in one of the GRC example usrp_tx_dpsk.grc (Random Source -> DPSK2 Mod -> Multiply Const -> USRP Sink), Multiply_Const = tx_ampl*p2p/2 , where p2p = 2^15.
Does anyone know why the Multiply_Const is set to tx_ampl*p2p/2 and what does p2p refer to?
Also, why the amplifier value are so different in these two examples? Which one should I use?