In 1961 when this
Citizen−Ship LT−3 Relayless Receiver promotion appeared in American Modeler magazine,
transistorized circuits were a relatively new thing. Many people were dubious of
the newfangled technology and were leery of the dependability of them. It didn't
take long for the convenience of low weight, small size, higher functionality, and
no need for bulky and heavy high voltage batteries to sway even the most hard cord
tubeist (a word I just made up) toward adopting the format. Even so, the state of
the art had a long way to go to get anywhere close to today's micro- and nano-sized
receivers and servos, with capabilities and reliability levels only dreamed of in
1961. The escapement mechanism featured was powered by a twisted rubber band. A
pulse of current from the receiver caused the control arms to rotate a quarter turn
when a small solenoid released the escapement tab. So, although the receiver itself
was "relayless," the escapement still had one (a relay is a solenoid with make/break
Citizen-Ship LT-3 Relayless Receiver
Very light relayless receiver from Citizen-Ship,
LT-3 weighs 1 ounce, works off 3 volts, drives SE-2 non-sequence escapement shown
direct without use of relays. See "Commercial News" for additional details of equipment.
Tiny and very Light relayless receiver is offered by Citizen-Ship Radio Corp.
(Indianapolis 20). This is the model LT "3," which measures 2-1/8 x 1-1/4 x 7/8"
and weighs just one ounce. It is an all-transistor tone set, for use with C-S CTX
(or similar) transmitters. Set works on 3 volts, and to go with it, company has
two matching escapements; the PSN-2 is a 2 position self-neutralizing unit, while
SE-2 is a non-sequence escapement. Price of the new receiver with the PSN-2 is $27.95,
with the SE-2 it is $29.95. Either style is ideal for use in the tiniest R/C planes,
including those with 1/4A power. This concern, too, is working on relayless multi
control servos, and will have relayless receivers to go with them.
Posted October 14, 2023