A 28 tone well tempered nonet (28WTN) is related to well temperaments of 23edo and 24edo, but with a nonet rather than the 2/1 being constant. Its patent tunings alternate division of the just perfect fifth into 14 equal parts (14EDF) with sequences of fourteen equal steps of 42.8571 to 57.1429 cents each. This will create fourteen equally-spaced intervals between an interval between 600 and 800 cents and the just perfect fifth.

Optimal Intervals

Minimum a Maximum a Minimum b Maximum b
1 50.1396
2 100.2793
3 150.4189
4 200.5586
5 250.6982
6 300.8379
7 350.9775
8 401.1171
9 451.2568
10 501.3964
11 551.536
12 601.6757
13 651.8154
14 701.955
15 755.2883 759.0979 749.955 753.3836
16 808.6117 816.2407 797.955 804.8121
17 861.955 873.3836 845.955 856.2407
18 915.2883 930.5264 893.955 907.6693
19 968.6117 987.6693 941.955 959.0979
20 1021.955 1044.8121 989.955 1010.5264
21 1075.2883 1101.955 1037.955 1061.955
22 1128.6117 1159.0979 1085.955 1113.3836
23 1181.955 1216.2407 1133.995 1164.8121
24 1235.2883 1273.3836 1181.955 1216.2407
25 1288.6117 1330.5264 1229.995 1267.6693
26 1341.955 1387.6693 1277.995 1319.0979
27 1395.2883 1444.8121 1325.995 1370.5264
28 1448.6117 1501.955 1373.995 1421.955