The OS Digitron DP-3,
3-Channel Radio Control System was my first radio control system. To the right is a photo
of my system, that was first installed in a homemade air boat (Cox .049 used for power).
The transmitter and the receiver both had a dark blue, metal case.
At one point I installed the OS Digital 3-Channel radio in my
Andrews S-Ray model airplane. It had a steerable
nose gear and throttled engine, which allowed me to run it up and down the road in front
of my house for fun - yes, at 13-14 years old that counts as fun. My neighbors begged
to differ, however, since the transmitter, at 27.195 MHz spewed some pretty significant
harmonics (television interference, TVI) at the VHF television channels. The 2nd, 3rd,
6th, and 7th harmonics fell squarely into the band. When I switched the transmitter on
during the summer afternoons when soap operas and game shows were being viewed, housewives
within three or four houses of mine would stick their heads out the door and yell at
me to turn it off. VHF channel 5 seemed to be the most vulnerable to my interference.
They weren't too thrilled with the engine noise, either.
The pictures below were grabbed from an auction on eBay. It looks exactly like the
system I had. I had completely forgotten about the sewn leather case that went on the
transmitter. It came in handy once when I left the transmitter sitting on top of my car
after loading the airplane and field equipment into the car, then puling out of the driveway
and seeing the transmitter bounce off the road. Yikes. The only damage was a hole in
the side of the leather case where one corner of the metal case punched through.
OS Digitron DP-3 Transmitter - Front w/Back Cover
OS Digitron DP-3 Transmitter - Back
OS Digitron DP-3 Transmitter - Open Back
OS Digitron DP-3 Transmitter - Printed Circuit Board Component Side
OS Digitron DP-3 Transmitter - Front 3/4 View
OS Digitron DP-3 Transmitter - Right Gimbal
OS Digitron DP-3 Transmitter - Right Side
OS Digitron DP-3 Transmitter - NiCad Battery Pack
OS Digitron DP-3 Transmitter - Top w/Open Back
OS Digitron DP-3 Transmitter - Left Gimbal
OS Digitron DP-3 Radio Control System - Transmitter - Left Side
OS Digital 3-Channel R/C System Servos on eBay
OS Digital 3-Channel R/C System Servos on eBay (modelenginegarage)
See other Vintage Radio
Control Systems here.
Here is a photo of an OS 6 channel radio that went up for bids on eBay in July of
2008. I've been waiting for one of the 3 channel models.
Posted September 14, 2015