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Re: [Discuss-gnuradio] Multiplexing modulators

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Multiplexing modulators
Date: Tue, 21 Jun 2011 19:54:28 -0400
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110428 Fedora/3.1.10-1.fc14 Thunderbird/3.1.10

On 06/21/2011 04:40 PM, John Ackermann N8UR wrote:

Thanks, Nick.  I missed the sample rate factor because I was thinking of USRP1. 
 I'll fix that and the fallacy of adding rates, and try again.



I have an example, in GRC, attached.

It uses an audio source, which is common to all three modulators, this goes to a fractional interpolator to interpolate up to the basic
  sample rate of 200Ksps, which is an integral divisor of 100Msps.

I don't actually send it to a USRP2, but you can see the basic structure, with complex multipliers acting as mixers, and a pair of 30Khz signal sources, sampled at the 200Ksps sample rate, one set for 30KHz, the other set for -30KHz. An FFT display shows
  you the composite spectrum.

The bandwidth of the modulators is set by changing the "sensitivity" parameter.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

Attachment: three_fm_modulators.grc
Description: application/gnuradio-grc

Attachment: three_fm_modulators.py
Description: Text Data

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