Balanced Part Ternary Designs: Some New Results

A balanced part ternary design (BPTD) is a balanced ternary design (BTD) with a specified number of blocks, say \(b_2\), each having repeated elements. We prove some necessary conditions on \(b_2\) and show the existence of some particular BPTDs. We also give constructions of infinite families of BPTDs with \(b_1 = 0\), including families of ternary \(t\)-designs with \(t \geq 3\).