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From: | Ed Criscuolo |
Subject: | Re: [Discuss-gnuradio] How to hold a values from file source |
Date: | Thu, 28 Oct 2010 10:08:05 -0400 |
User-agent: | Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.11) Gecko/20101013 Thunderbird/3.1.5 |
On 10/27/10 1:23 PM, Marcus D. Leech wrote:
Looking at the flow-graph, it seems like the modulation "bits" are running at the same rate as the carrier frequency, which won't work--not even slightly. Generally in AM/ASK, the modulation frequency is *much* lower than the carrier frequency, my gut is that you'd need at least several cycles of carrier between each bit.
In addition, the two sample rates flowing into the multiplier are different. The 47 kHz "carrier" has a sample rate of 3Meg, while the digital data has a sample rate of 47K. You will need to upsample your data stream to the same sample rate as the carrier. Since there isn't an integer ratio between the two rates, you'll have to use the rational_resampler block. @(^.^)@ Ed
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