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 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 is my OS Digital 3-Channel that I bought off of an eBay auction.
It looks exactly like the system I had. It did not come with the sewn leather case
that went on the transmitter, so I am still looking for one if you know where it
can be gotten. The case 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.
I would like to one day install the electronics from my Futaba Skysport T4YF
transmitter (72.750 MHz FM) into it for use with my Spirit glider.
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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
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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
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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
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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
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