Software to generate two tone visual signalling is written and just needs
final testing, then I should be able to put out some test transmissions
within a day or so for evaluation of the technique. Are there any
preferred freqencies for these tests ? If not I'll go for the top end of the
band, centred on 137790.00Hz Since this mode has close to a 100% duty
cycle, transmitters will have to be wound back a bit so tests will be either
at 5 Watts from a small test PA (approx. 300uW ERP) or 400 Watts from the
biggie, (24mW ERP)
Initially, parameters will be something like 1 minute per tone with a tone
spacing of 0.5Hz, giving a bandwidth of 3Hz, 1.5Hz above and below the
nominated frequency.
Coding will be as per Rik's posting, viz :
(1 = lowest tone .. 7 = highest tone) :
A = 11 H = 21 O = 31 V = 41 0 = 51 7 = 61 space = 71
B = 12 I = 22 P = 32 W = 42 1 = 52 8 = 62 report 'O' = 72
C = 13 J = 23 Q = 33 X = 43 2 = 53 9 = 63 report 'M' = 73
D = 14 K = 24 R = 34 Y = 44 3 = 54 report 'T' = 74
E = 15 L = 25 S = 35 Z = 45 4 = 55 'CQ' = 75
F = 16 M = 26 T = 36 5 = 56 / = 66 final 'K' = 76
G = 17 N = 27 U = 37 6 = 57 ? = 67 final 'SK' = 77
Any ideas for a name for this mode ?. And lets stay away from Q codes :-(
Andy G4JNT
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