mirror of
https://github.com/cnlohr/lolra.git
synced 2026-06-15 07:19:25 +00:00
cnlohr
93 lines
2.5 KiB
HTML
93 lines
2.5 KiB
HTML
<!DOCTYPE html>
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<HTML>
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<HEAD>
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<SCRIPT>
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function DrawSpan( colspan, freq, target, docolor )
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{
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var fdist = Math.abs( freq - target );
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fdist = Math.pow( fdist, 0.5 ) * 500;
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// if( fdist > 255 ) fdist = 255;
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let ret = "<TD COLSPAN=" + colspan + ' ';
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if( docolor ) ret += 'STYLE="background-color:rgb(' + fdist + ',' + (511-fdist) + ',0)";';
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ret += '>' + freq.toFixed(6) + "</TD>";
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return ret;
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}
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function computeTable()
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{
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const max_harmonics = 28|0;
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const min_harmonics = 1|0;
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let xtal = Number(document.getElementById("crystalmhz").value );
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let target = Number(document.getElementById("targetmhz").value );
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let contents = "<TABLE BORDER=1>";
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contents += '<TR><TH>d\\h</div></TH>';
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for( let h = 0|min_harmonics; h <= max_harmonics; h++ )
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{
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contents += "<TH COLSPAN=2>" + h + "</TH>";
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}
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contents += "</TR>";
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for( let n = 0|28; n <= 66; n++ )
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{
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for( let mode = 0; mode < 4; mode++ )
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{
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contents += "<TR>";
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if( mode == 0 )
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contents += "<TD ROWSPAN=4>" + n + "</TD>";
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for( let h = 0|min_harmonics; h <= max_harmonics; h++ )
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{
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let freq = ( xtal / n );
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if( mode == 0 )
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contents += DrawSpan( 2, freq * h, target, false );
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else if( mode == 1 )
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contents += DrawSpan( 2, freq * (h-.25), target, true );
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else if( mode == 2 )
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contents += DrawSpan( 2, freq * (h+.25), target, true );
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else if( mode == 3 )
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contents += DrawSpan( 2, freq * (h+0.5), target, true );
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}
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contents += "</TD>";
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}
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}
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contents += "</TABLE>";
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document.getElementById( "TABLE" ).innerHTML = contents;
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}
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</SCRIPT>
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</HEAD>
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<BODY>
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<p>Tool for computing tuning to specific frequencies by use of direct ADC reading at specific timer-controlled rate to "tune" to specific frequencies either by quadrature or differential.</p>
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<TABLE>
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<TR><TD>Crystal MHz</TD><TD><INPUT ID=crystalmhz VALUE=48></TD></TR>
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<TR><TD>Target MHz</TD><TD><INPUT ID=targetmhz VALUE=27.1></TD></TR>
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<TR><TD COLSPAN=2><INPUT TYPE=SUBMIT ONCLICK="computeTable()"></TD></TR>
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</TABLE>
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<TABLE>
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<TR><TD>Quadrature:</TD></TR>
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<TR><TD>I = + + - -</TD></TR>
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<TR><TD>Q = + - - +</TD></TR>
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<TR><TD>Differntial:</TD></TR>
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<TR><TD>V = + - + -</TD></TR>
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<TR><TD>You choose the mode you operate in, either Quadrature or differential</TD></TR>
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</TABLE>
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<p> Table shows: </P>
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<TABLE BORDER=1>
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<TR><TD>Sample Frequency Harmonic</TD></TR>
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<TR><TD>Lower Quadrature Frequency</TD></TR>
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<TR><TD>Upper Quadrature Frequency</TD></TR>
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<TR><TD>Differential Frequency</TD></TR>
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</TABLE>
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<DIV ID=TABLE></DIV>
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</BODY>
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</HTML>
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