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“When transmitting between 2 laptops, I can see a continuous amber light on the CD LED- why?”
We re-created the scenario of two laptops plus two 3AS radio modems these are our findings:-
When an inactive modem is held within contact of either switched on laptop (with no programs running) a continuous amber CD light is seen, as the radio modem is moved away from the laptop this becomes a flashing amber with the frequency of flash decreasing with increasing separation between the laptop and the modem. At the distance of approximately 1m the flashing light becomes infrequent reducing to no detectable intensity at a range of approximately 2m. Saterm was used transmitting a continuous counter; in all cases 100% accurate data was received.
On the Transmit modem (at a variety of distances from the laptop) CD and TD light flashed red in a synchronized manner. CTS light was a steady red. All other lights are off.
On the receiving modem, at a distance greater than 2m, whilst data is being received CD is green and RD is red, all other LEDs are off. Whilst data is not being received CTS is red and all other lights are off. This pattern flashes in time with the data. If the modem is within one metre of the laptop, a continuously flashing amber CD is superimposed on top of the previous pattern, this is more visible if a significant data packet is used in testing (i.e 1Kb)if a short data packet is used it gives the appearance of being constantly amber, in reality the 3AS will typically blast over the top over the interference hence you are detecting a perfectly working system with the only anomaly being a flashing amber CD light.
Please look at section 10.3.4 in the user guide "General antenna installation instructions"
Therefore, my findings are as before, insofar as the amber light displayed on the CD LED is caused by spurious interference from a local source.
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Also.... many customer have had problems with their laptops going onto standby mode and thus interrupting transmission, and beware of adaptors, there are many com port adaptors that don’t quite do the job, it is best to avoid them. |
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