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[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?

Many thanks!


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