|The ROF 1 receiver is designed for the radio orienteering
sport with a adjustable gain setting and audio signal strength indication for easy to
determine the direction to the transmitter.
||Frequency coverage is 144MHz to 145MHz (option to tune from
135MHz to 150MHz). It's designed for AM reception, but is also be able to detect the
direction to a FM transmitter.
ROF-1 pcb received from Olimex
New documentation R4.0 released
Feb 1 2007
Complete with 3 ROF-1 R3.3
PCB ROF-1 R.3.3 prodced
||About the receiver
construction constrains has been weight, easy operation, water proofness and adequate
The total weight of the receiver is about 500g (ex headset).
Sensitivity is about -110dBm.
Close range saturation limit aproximately 3m from transmitter (2W power into halo
Status of the new receiver:
The design has been tested and verified in competition. The list below contains some of
the construction details of the different versions.
The current R4 version is not yet tested. Controller program is under development.
||Technical description Edition 12
||Schematic of all boards
|Source code AVR
||C Source code archive for the Tiny26 controller
|Programming file AVR
||Hex format programming file
|Top and bottom sticker
A changelog will be provided here. Only the latest documentation will be archived on
the web pager. Old documentation can be sent as email from the designer.
|R3 to R3.1
- RoHS directive requires the audio opamp TDA7050 to be changed to a SO8 (surface mount)
- Mobile telephone number prefix should be +4791179562
- Minor component values are changed.
||A new frequency control is beeing designed.
||Minor layout correction and component value change.
The schematic source can be altered using the freeware version of the Eagle CAD and is only intended for
non-profit use. The print layout can be used for own PCB manufacturing. It's not as good
as a real double sided board with through plating, but will work for making a test board.
Print without any scaling to get an exact layout. The board outline is 160x100mm.
Any questions and comments are welcome and can be sent to la9nga /at/ online.no