RX1 Noise Bridge - VK1OD build
The following pics document my build of a VK3AQZ RX1 Noisebridge.
Fig 1:
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Fig 2:
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Above, constructed with N jacks for the receiver and unknown port, and
jack for external DC supply.
Fig 3:
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Above, a view of the interior from the front. The jack for external DC
can be seen at the rear of the original battery compartment.
Fig 4:
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Above, a view of the interior from the rear. A 100mA Polyswitch was
added to the switch board to provide overcurrent protection, mainly for
the external supply / battery.
Fig 5:
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Above, the waveform at the collector of a multivibrator transistor, and
the modulated noise into the bridge (loaded). The modulated noise is
quite different to that shown in the manual, partly due to the fact
this is a single trace captured on a DSO.
Changes
| Version |
Date |
Description |
| 1.01 |
08/04/2011 |
Initial. |
| 1.02 |
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| 1.03 |
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