QST, Feb 1968, p. 1.
QST, Feb 1968, p. 1.
QST, Nov 1969, inside front cover.
QST, Jan 1970, inside front cover.
QST, Feb 1971, p. 1.
The HA-20 was the remote VFO for Hallicrafters’ SR-400 transceiver and could also be used with the SR-750 and SR-2000. It had a built-in SWR bridge and meter.
Review: QST. Oct 1968, p. 49.
