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Re: [Discuss-gnuradio] Help on GRC to transmit at a specific frequency a
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] Help on GRC to transmit at a specific frequency and width |
Date: |
Fri, 28 Aug 2009 13:35:21 -0700 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Fri, Aug 28, 2009 at 09:00:07AM -0700, Josh Blum wrote:
> The sample rate of the signal source is 1M. The sample rate of the usrp2
> is 100M/64. Your rates disagree.
>
> -Josh
>
> dennis wrote:
>> Hi @ all
>>
>> Sorry, this stuff is new for me and therfore sorry for a possible
>> stupid question ;-) . I play a little with GRC and want to transmit
>> e.g. a cosine-wave at a specific frequency e.g. at 900MHz and width,
>> say 2MHz. But my problem are as following:
>>
>> If i add only 2 blocks, i got nice constant transmission but the width
>> are too large, say more than +- 30 Mhz
>> __________ ______________
>> | signal | | | source:
>> sample_rate: 1M, waveform:cosine, Frequency: 1k, Amplitude: 100
>> | source |--------->| usrp2 sink | usrp2 sink:
>> interpolation: 64, Frequency: 900 MHz, Gain: 0
>> |__________| |______________|
The USRP2 expects its input to be be between 0 and 1.0. Try using
Amplitude = 0.1
Eric