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FA-AS
Automatic Antenna Selector
Construction and User Manual
*
Antenna selector for Icom Transceivers with one antenna
socket. For use with up to 4 separate antennas, each operating
frequency may be automatically or manually selected, also
with an optional transverter. Possibility of using separate
transmitting and receiving antennas.
*) Recent version downloadable from www.box73.de.
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Summary of Contents for Funk Amateur BX-7300
- Page 1 FA-AS Automatic Antenna Selector Construction and User Manual Antenna selector for Icom Transceivers with one antenna socket. For use with up to 4 separate antennas, each operating frequency may be automatically or manually selected, also with an optional transverter. Possibility of using separate transmitting and receiving antennas.
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Page 2: Table Of Contents
Mounting plan ........19 © www.funkamateur.de © www.funkamateur.de BX-7300 • 180403... -
Page 3: Introduction
FA-AS kit. It was conceived for the Icom IC-7300 (hence Dimensions (W × H × D) 238 × 33 × 240 mm the order number BX-7300) and also works well with other Weight ≈ 1.8kg Icom transceivers. The control for the antenna selection * Automatic mode 1.8 …... - Page 4 Antenna 1 Socket 3 Antenna 2 Socket 4 Antenna 3 Socket 5 Antenna 4 Socket 6 Socket 7 Socket 8 Line voltage Socket 9 Hex code switch Picture 2. Circuit diagram of the FA-AS antenna selector © www.funkamateur.de BX-7300 • 180403...
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Page 5: Circuit
Operation of the FA-AS is carried out with the aid of five push button switches S1 to S5. They lie di- rectly on the microprocessor port pins and through internal pull up resistance achieve a 5V potential. © www.funkamateur.de BX-7300 • 180403... -
Page 6: Mounting The Main Board
Subsequently the fuse holder for the cut out fuse F1, the two row connector strip J2 and the Quartz xtal Q1 should be sol- dered in place. The last one should be mounted with an ap- © www.funkamateur.de BX-7300 • 180403... - Page 7 3.6mm hole in the cooling vane. After a short time the cas- ing will be hot enough so that any solder remaining in the crack under the IC runs away. Picture 7. Earthing wire on Quartz housing. Picture 8. Soldered 5V voltage regulator © www.funkamateur.de BX-7300 • 180403...
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Page 8: Dc Supply Test
Picture 9. Site of test point M and +5V. of the board. Picture 10. Correct build positioning of IC 2; the site of the in- Picture 13. Position of IC 6 after mounting. dentation (arrowed) is to be paid attention to. © www.funkamateur.de BX-7300 • 180403... -
Page 9: Ic Mounting
The legs are quite wide with a limited tolerance, make sure to check the alignment. Picture 17. Shown here a section of soldered main board and sockets in a row. © www.funkamateur.de BX-7300 • 180403... -
Page 10: Relay And Led Assembly
(picture 21). Now the LED’s can be soldered and the front panel unscrewed again. Picture 20. Position of the two metal blocks for attaching the front panel. Picture 21. Fully aligned LED’s, with help from the front panel. © www.funkamateur.de BX-7300 • 180403... - Page 11 Picture 23. Closed solder bridges J3 and J4 to join the CAT data circuit with the CI V connection socket. Picture 24. The microprocessor must be fitted to the mounting in this position; the indentation on the casing serves for the orienta- tion. © www.funkamateur.de BX-7300 • 180403...
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Page 12: Case Housing
Picture 25. Rear view of the fully built FA-AS; the earth symbol Picture 28. The four rubber feet on the underside of the base marks the housing screw which serves as the earthing point. plate are useful later for a steadier stand. © www.funkamateur.de BX-7300 • 180403... -
Page 13: Assembly Of The Control Cables
[2]. switched externally. Transverter TRX-ACC TRV CI-V Antenna Selector FA-AS Line voltage, Data (H)SEND, +13,8V Antenna Remote IC-7300 Picture 30. Connection of the FA-AS to an Icom transceiver. © www.funkamateur.de BX-7300 • 180403... -
Page 14: Function Test
Ubsp in table 2. Of note is that plugged transverter test routine on open CAT (S/E) the WARC bands and the neighbouring classic bands are plugged CAT (E) © www.funkamateur.de BX-7300 • 180403... -
Page 15: Cat Interface Test
Operating the TRV button will start up the checking and installation routine and, if the result is fault free, resolve the switching. When, for example, another © www.funkamateur.de BX-7300 • 180403... -
Page 16: Control Power For Transverter Mode
Table 6. Significance of flashing LED’s after running the interface tests. LED’s after switch on Significance ANT 1 ANT 2 ANT 3 ANT 4 Line voltage Automatic Manual present mode mode green green green green × green green × green green × × © www.funkamateur.de BX-7300 • 180403... -
Page 17: Automatic Mode
The FA-AS can also be ‘reversed’ in that it may serve one antenna yet several transceivers or receivers. Then the an- tenna is connected to the TRX socket and the sets to the an- tenna sockets. Selection is possible in manual mode by but- ton press. © www.funkamateur.de BX-7300 • 180403... -
Page 18: Attachments
Hollow round 2.1mm plug 1 Fuse holder Fuse 250mA Made up cable Plug: mini DIN6 DIN plug 13 pole Main board Socket board Silvered copper wire CuAg, 1mm 10cm Insulation 25cm Housing lid Housing base plate © www.funkamateur.de BX-7300 • 180403... -
Page 19: Mounting Plan
Attachments Automatic Antenna Selector Picture A1. Mounting plan of the Automatic Antenna Selector FA-AS © www.funkamateur.de BX-7300 • 180403...
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