Rafael Vidal Aroca wrote:
>     Hi guys, i'm working in a tracker project and strange things are
> happening. I tested it on a pair of Motorola's Talkabout and i get
> 100% of reception. All the packages i send i can receive.

Ok, it works with low power.

>    But when i try it on a pair of Motorola's PRO5100 that are bigger
> radios, most of the signal did not arrive. I lost about 50% of the
> transmited packets.

Several things come to mind.  One is the audio filtering on the second
radio.  Perhaps the bandwidth is too narrow for the baud rate you are
attempting to send.  Maybe the levels of the signals need to be
adjusted?  I highly suspect that RF is entering your transmitter thru
your MIC/hookup cable or even the power leads and garbling the data
during transmission.  Check the SWR, relocate the transmitting antenna,
shield the audio connection cable better.  I would start by viewing the
received data on a scope to see if it's distorted or too low/high in
amplitude.

michael brown

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