80m 3W Transmitter ATX-80

CLASSIC 80M TRANSMITTER FOR RADIO ORIENTEERING

atx80boxThe 80m TX described here is the well known ON7YD ATX-80 and timer, combined in a standard aluminium enclosure.
For a full description of this excellent design visit the ON7YD web site

Schematic

Schematic

The PIC timer and RF circuits have been combined and a PCB designed to fit a standard AB28 folder aluminium box.
The AB28 box is ideal because it neatly accommodates a 10xAA battery pack with the main PCB above. In operation, the unit is placed in a plastic bag and hidden under leave mould. A plastic storage box, or plastic pipe might be other weather proofing alternatives.

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Enlarging the fixing holes to slots gives a folding top.

 

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Wider Aluminium Enclosure

Using a slightly wider aluminium box Type AB23 This allows the inclusion of a simple toroid matching device, in the enclosure.

PIC SOFTWARE

You can use the original software by ON7YD or alternatively the G3ZOI software, which has been enhanced to allow an end-of-transmission callsign to be programmed into eprom.

 

MATCHING ANTENNA

For details of a suitable 80m ARDF Antenna click here

PDF DOWNLOADS

VERSION-3 PCB dated 12:09

OLDER VERSIONS

PREPARING THE BOX

 

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Removing one of the bottom flanges

One side of the bottom flange needs to be modified to allow you to removal of the battery pack.
UPDATE ! No need to cut it as shown, just fold flat to the box bottom.

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Holes for the mounting posts

Drill and countersink the fixing holes for the PCB spacers. The spacers hang from the top flange. 

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Enlarge the existing fixing holes in the box-top to allow it to hinge.

Enlarge the existing fixing holes in the box-top to allow it to hinge.

4 thoughts on “80m 3W Transmitter ATX-80

  1. Matthias, DF2OF

    Hi,

    we would like to etch some boards. Do you have the dimensions of the printed board for me?

    Thanks and vy 73, Matthias DF2OF

    Reply
  2. ming li

    Hi,
    We want to build a “ATX-80” under your article,but in this page,
    MATCHING ANTENNA

    For details of a suitable 80m ARDF Antenna click here

    PDF DOWNLOADS
    It seems that the link do not work,could you please fix it?

    Reply

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