ARDF equipment

The following ARDF equipment has been owned and used by Hans Sundgren.

Receiver 145 MHz: Compact 145E
ARDF 144 MHz receiver

Technical data

  • Single conversion superheterodyne
  • Frequency: 145 to 146 MHz
  • Antenna: Optimized symmetrical HB9CV
  • Damping: 120 dB continously
  • Built-in electronic compass
  • Battery: NiMH accumulator 7.2 V, 320 mAh
  • 1040 x 290 x 50 mm, 490 g

Documents

August 2010

ARDF 144 MHz receiver, close upThe current 144 MHz receiver failed occasionally by refusing to receive anything. But it worked most of the times. This was not acceptable when travelling abroad for larger ARDF competitions, so Hans ordered the improved version now called 145E. The option "electronic compass" was also fitted.

ARDF 144 MHz receiver, in parts

Good

  • Very good sensitivity and forward/back characteristics
  • Rigid and overall well designed.

Bad

  • Non-standard DIN socket for headphones (which actually is a nice design also).
  • No schematics, but that is really no problem, since supplier fixes any guarantee problems.

2013 August: Two new sets of antenna elements

When running in the forest Hans occassionally stumbles and falls to the ground. When this happens, the antenna elements are sometimes bent. Hans bought extra spares already in 2010, but they have now been destroyed. Hans orders 2 new sets of spare antenna elements. Price: 16 Euro per set of 4 elements.

Battery tester T810
Battery tester

Technical data

  • Green light: Good.
    Receiver is ready for competition. Charging is not necessary.
  • Yellow light: Enough for one race only. Receiver is ready for one training or race. Charging is recommended.
  • Red light: Bad.
    Charge the accumulator immediately. If this does not help, replace the accumulator.
  • 45 x 17 mm, 10 g

Documents

August 2010

Battery tester fitted in receiverThe T810 tester is a microprocessor controlled device designed for accumulator status check of ARDF receivers of type COMPACT and SUPERFOX. It tests the accumulator in the receiver under load.

Just plug it in to the DIN-socket. Actually, this is one benefit with the DIN-socket; it gives access to both audio and battery poles, as well as it is used for the on/off switch.

Good

  • Very easy to use
  • Clear indication.

Bad

  • None.
  • None.
Receiver 145 MHz: Compact 145

Technical data

  • Single conversion superheterodyne
  • Frequency range: 145 to 146 MHz
  • Antenna type: Optimized symmetrical HB9CV
  • Damping: 120 dB continously
  • Battery: NiMH accumulator 7.2 V, 320 mAh
  • 1040 x 290 x 50 mm, 490 g

Documents

Xxxx 20xx

Xxxxxxxxxxxxxx

Good

  • Very good sensitivity and forward/back characteristics
  • Rigid and overall well designed.

Bad

  • Non-standard DIN socket for headphones (which actually is a nice design also).
  • No schematics, but that is really no problem, since supplier fixes any guarantee problems.

Receiver 3.5 MHz: Superfox 3.5GX
Superfox 3.5GX

Technical data

  • Double conversion superheterodyne
  • Frequency: 3.48 to 3.71 MHz
  • Antenna: Ferrite
  • Damping: 120 dB in 8 steps
  • Battery: NiMH accumulator 7.2 V, 320 mAh
  • 100 x 180 x 30 mm, 350 g

July 20xx and August 2010

Hans has been running with the Saltsjö Data receiver since 1989. This direct conversion receiver has a low sensitivity resulting in that transmitters are not heard during international championships. Something has to be done and a group of Swedish runners decides to buy the Superfox, a superhetrodyne, before going to the world championships in China (?).

Superfox 3.5GX, in partsXxxxxxxxxxxxxx

Gain dial

Good

  • Very good sensitivity and forward/back characteristics
  • Rigid and overall well designed.

Bad

  • Non-standard DIN socket for headphones (which actually is a nice design also).
  • No schematics, but that is really no problem, since supplier fixes any guarantee problems.

2010 August: Additional receiver

The receiver gets a little unstable after 10 years so Hans buys a second one, to be on the safe side.

Gain dial

2010 August: Repair of old receiver

The old receiver is not working and is sent to Xxx for repair.

2013 August: Overhaul

After a decade the first reciever still works except for that the side determining function (whip antenna) does not work at all. There is no difference in directions. The receiver is sent to the supplier during the European Championships in Poland for investigation. One week later Hans receivs a nice functioning receiver. "It needed a complete "overhaul" according to the repair engineer. The receiver now has a new DIN-connector and is water sealed besides functioning perfectly. A manual addendum is also included in the package. Cost: 0 SEK.

Documents

Receiver 145 MHz: Russian 145

Technical data

  • Single conversion superheterodyne
  • xxxx

Documents

  • None

Xxxx 20xx

Xxxxxxxxxxxxxx

Good

  • Inexpensive
  • Rigid.

Bad

  • Heavy.
  • Non-standard accumulators with simple charger without transformer.

20xx xxx: End-of-life

The receiver is not working and Hans sells it to an ARDF runner in Göteborg who is also an electronics engineer. He manages to get it in operation without problem.

Receiver 145 MHz: Nadja

Technical data

  • Frequency range: 145.xx to 145.xx MHz
  • Antenna type: Yagi
  • Damping: Continously
  • Battery: 9 V
  • XXX x XxX x Xx mm, XXX g

Documents

  • None

Xxxx 199x

Xxxxxxxxxxxxxx

Good

  • xxx
  • xxx.

Bad

  • xx.
  • xxxx.
Receiver 145 MHz: SM5CJW

Technical data

  • Frequency range: 145.xx to 145.xx MHz
  • Antenna type: Yagi
  • Damping: Continously
  • Battery: 9 V
  • XXX x XxX x Xx mm, XXX g

Documents

  • None

Xxxx 199x

Xxxxxxxxxxxxxx

Good

  • xxx
  • xxx.

Bad

  • xx.
  • xxxx.
Receiver 3.5 MHz: Saltsjö Data RX80

Technical data

  • Frequency range: 3.xx to 3.xx MHz
  • Antenna type: Ferrite
  • Damping: 3 steps
  • Battery: 3 V, 2xAA
  • XXX x XxX x Xx mm, XXX g

Documents

  • None

Xxxx 1988

Hans starts to practice radio-orienteering (ARDF) in 1988. First he borrows a receiver but after some time he decides to build his own and buys a kit from Saltsjö Data. After running with the original design of the receiver, he wants to change the physical design to be flush, without protruding knobs.

Good

  • xxx
  • xxx.

Bad

  • xx.
  • xxxx.