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1. Re: LF: DSP app to multiply tone by 4 ? (score: 1): Author: Tobias DG3LV <[email protected]>; Date: Mon, 25 Feb 2013 14:21:05 +0100; Hi Graham ! An alternative would be to use hardware like two cascaded active rectifiers using OP-amps to get the frequency x 4. As those digital modes do not need linear sine waves on transmit, it is; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-02/msg00332.html (10,174 bytes)
2. Re: LF: DSP app to multiply tone by 4 ? (score: 1): Author: "Graham" <[email protected]>; Date: Mon, 25 Feb 2013 14:54:14 +0100; Tobias Yes that's the other way I suppose , harmonic generator and some filter .the ssb tx will do the rest ( we hope)...may be a email to Patric , multi psk , he did make a test version some time ag; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-02/msg00351.html (11,917 bytes)
3. LF: DSP app to multiply tone by 4 ? (score: 1): Author: "Graham" <[email protected]>; Date: Mon, 25 Feb 2013 13:25:56 +0100; DSP app to multiply tone by 4 ? One thing that one of the PA (Dutch PA) stations spotted , is the 477 band is a handy divide by 4 from 1.9MHz .. and if you use two flip-flops , you can divide from 1.; /rsgb_lf_group-archives/html/rsgb_lf_group/2013-02/msg00559.html (9,274 bytes)

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