Thru Meters

FEEDS 2nd RECEIVER

Model PTt with built-in power supply, transfer relay, connecting cables, wired and tested. Amateur Net $59,95

■ A frame grid pentode provides low noise figure with ability to handle strong signals, greatly improving the sensitivity of the receiver section of a transceiver.

■ A unique built-in transfer circuit enables the PT to by-pass itself while the transceiver is transmitting. The PT also feeds the antenna input of a 2nd receiver as well as muting AMECO

DIVISION OF AEROTRON, INC. « P. 0. BOX 6527 » RALEIGH, N. C. 27608

Older vhf operators perhaps recall the five-year investigation of 50 mhz propagation effects that my wife, K7ALF, and I conducted during the declining years of sunspot Cycle 19. That carefully-controlled study was initiated late in 1958, a full year after Cycle 19 had peaked and started down, and continued until January 1964.

The most significant single finding of that 27,855 hour research effort demonstrated that sporadic-E propagation supported six meter DX opportunities increased steadily as the sunspot cycle declined. ¿Figs. 1, 2; Tables A through H),

Table A

compakativi-: summary

Sis Meier DX November 1. 195H -January J;; I ^64

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