Expert Electronics SunSDR2 DX Quick Start Manual

Expert Electronics SunSDR2 DX Quick Start Manual

Hf output power check
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HF output power check

1. Check the output power with Tune mode and dummy load.
Set Tune slider to 100%, on HF bands you should have about 100W with current about 20А.
If the current is lower, then do the following:
Set Drive=0
Press MOX
Current should be about 4.7А, if it's lower, then most likely one of the transistors got burned,
it should be replaced.

2. Open the TRX

Unscrew 4 screws on the front panel, remove the metal panel and plastic panel;
Unscrew 2 top screws on the rear panel;

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Summary of Contents for Expert Electronics SunSDR2 DX

  • Page 1 HF output power check 1. Check the output power with Tune mode and dummy load. Set Tune slider to 100%, on HF bands you should have about 100W with current about 20А. If the current is lower, then do the following: Set Drive=0 Press MOX Current should be about 4.7А, if it's lower, then most likely one of the transistors got burned,...
  • Page 2 Grip the front of the heatsink and pull it for 2 cm. PCB will be extracted with the heatsink; Pull the cable down with the pincer;...
  • Page 3 Pull the heatsink till the middle of the case, making sure that cables that connect both parts are OK. Now disconnect these 3 cables from the SDR board. Disassemble the TRX, pull out the heatsink and then pull out the SDR board out of the case.
  • Page 4 3. Connect a 50Ohm – 100W dummy load and go to TX with 100% Drive level. 4. Check the HF voltage on the XS2P connector, it should be around 1V. 5. Check RD16 and RD100 transistors to make sure they are not short-circuited. 6.

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