Citizen-Ship Model SPX Single-Channel Radio Control System

My very first radio control system was a single-channel Citizen-Ship Model SPX like this one I bought on eBay. I stupidly sold my original, which was in mint condition and still in the box many years ago, this example is in used condition, but still looks pretty good. A little isopropyl alcohol and 409 cleaner did a nice job of cleaning the 'used-ness' off of it. This was one of the first transistorized production radio systems which, along with other such systems, prompted a lot of people to get into radio control since cost, size, weight, and complexity were greatly reduced. Much greater immunity to vibration and electrical noise effects made reliability much better as well.

Citizen-Ship Model SPX Transmitter & Receiver  - Airplanes and Rockets

Four transistors are used in the transmitter: a Texas Instruments (TI) 2N696 and a TI 2N1305, and two 2N2188s. The 2N696 is a silicon NPN type, the 2V1305 is a germanium PNP type, and the 2N2188 is a germanium PNP type. The receiver uses a Philco 2N260 silicon PNP transistor and a Philco 2N261 silicon PNP transistor.

Transmitter inside left (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Transmitter inside left (Citizen-Ship SPX R/C System)

Transmitter inside center (Citizen-Ship SPX R/C System) - Airplanes and Rockets 

Transmitter inside center (Citizen-Ship SPX R/C System)

Transmitter circuit board bottom (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Transmitter circuit board bottom (Citizen-Ship SPX R/C System)

Transmitter inside right (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Transmitter inside right (Citizen-Ship SPX R/C System)

Transmitter circuit board top (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Transmitter circuit board top (Citizen-Ship SPX R/C System)

TI 2N696 transistor on transmitter board (Citizen-Ship SPX R/C System) - Airplanes and Rockets

TI 2N696 transistor on transmitter board (Citizen-Ship SPX R/C System)

TI 2N1305 transistor on transmitter board (Citizen-Ship SPX R/C System) - Airplanes and Rockets

TI 2N1305 transistor on transmitter board (Citizen-Ship SPX R/C System)

 

2N696    2N1305

Receiver PCB transformer side (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Receiver PCB transformer side (Citizen-Ship SPX R/C System)

Receiver PCB ctransistor side (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Receiver PCB transistor side (Citizen-Ship SPX R/C System)

Receiver PCB bottom side (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Receiver PCB bottom side (Citizen-Ship SPX R/C System)

Receiver PCB top side (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Receiver PCB top side (Citizen-Ship SPX R/C System)

Receiver PCB crystal side (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Receiver PCB crystal side (Citizen-Ship SPX R/C System)

Receiver PCB antenna side (Citizen-Ship SPX R/C System) - Airplanes and Rockets

Receiver PCB antenna side (Citizen-Ship SPX R/C System)

 

 

Posted May 6, 2015