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Technical pages

ROF 1 ARDF receiver

  
Sist endret: 15.03.07      

 

  
Description
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.
Last updates

March 2007
ROF-1 pcb received from Olimex
New documentation R4.0 released

Feb 1 2007
Complete with 3 ROF-1 R3.3
Decals received

Aug 2006
PCB ROF-1 R.3.3 prodced

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rof1 About the receiver

The mechanical construction constrains has been weight, easy operation, water proofness and adequate strength.

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 antenna).

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.

ROF-1 R4.

The current R4 version is not yet tested. Controller program is under development.

Document name Description Format
ROF4Ed12TechDescr.pdf Technical description Edition 12 pdf
ROF1-R4.pdf Schematic of all boards pdf
ROF1_bom_R4.0.xls Partlist excel
Source code AVR C Source code archive for the Tiny26 controller zip
Programming file AVR Hex format programming file txt
TopR4.jpg
Bottom		 Top and bottom sticker jpg

ROF-1 R3.

Document name Description Format
TechnicalDescriptionEd10_doc.zip Word document with the original document. Edition 10 zip
word 97
TechnicalDescriptionEd10.pdf Technical description Edition 10 pdf
SchematicR3_1.pdf Schematic of all boards pdf
2m_ARDF_RX_deliveryR3_1.zip Eagle source of the boards zip
eagle-cad
Top sticker R.3.3
Bottom		 Top and bottom sticker jpg
ROF1_bom_R3.2.xls Detailed partlist R3.1 Excel xls
ROF1- Changenote R3.1-2 Strap of PCB controller board pdf

Changelog

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.

Change Date Description
R3 to R3.1 24.Sept 2006
  1. RoHS directive requires the audio opamp TDA7050 to be changed to a SO8 (surface mount) package.
  2. Mobile telephone number prefix should be +4791179562
  3. Minor component values are changed.
R4.0 21.Oct 2006 A new frequency control is beeing designed.
R3.1-2 11.Nov 2006 Minor layout correction and component value change.

Design utilities

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