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Unless you set the carrier 2.5 kHz above/below center frequency you will have excess carrier on sideband transmit. The edges of the filter's "window" serve to suppress the carrier. The balanced modulator removes most of the carrier, but the filter does the rest of the job. But only if the carrier is set far enough above/below the filter's center frequency. The wider filter won't knock down the carrier if it's only 1.5 kHz away from center.

The 148 won't care how you set it up. And you'll have learned something by the time you're done with the project.

Makes the effort worth it, most likely.

73

[QUOTE="nomadradio, post: 828044, member: 22"] Unless you set the carrier 2.5 kHz above/below center frequency you will have excess carrier on sideband transmit. The edges of the filter's "window" serve to suppress the carrier. The balanced modulator removes most of the carrier, but the filter does the rest of the job. But only if the carrier is set far enough above/below the filter's center frequency. The wider filter won't knock down the carrier if it's only 1.5 kHz away from center. The 148 won't care how you set it up. And you'll have learned something by the time you're done with the project. Makes the effort worth it, most likely. 73 [/QUOTE]

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