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<blockquote data-quote="Alan Haworth" data-source="post: 213558" data-attributes="member: 13820">It appears that problems I had were caused by the antenna arrangement of the previous installation.&nbsp; The RE3 replaced a RE2 system.&nbsp; The RE2 worked fine with two 3 dB gain mobile radio antennas (passive)&nbsp; at the operating frequency. The new receiver does not switch antennas solely on the strength of the RF signal from the antenna. (&quot;The diversity reception technology minimizes the chances of signal dropouts by providing two separate antenna locations which are electronically chosen moment-by-moment based on signal strength and stability. &quot;).&nbsp;&nbsp; My best guess is that the second condition (stability )for switching was not met.&nbsp; A friend that worked for the Union Pacific told me that the RE3 system was designed to detect and switch antennas based on &quot;mulitpath&quot; signal fade.I put a BNC &quot;tee&quot; on the &quot;A&quot; antenna port and connected both antennas to the same port.&nbsp; The &quot;B&quot; port was connected to one of the supplied antennas with a short extension cable to get it outside of the metal rack cabinet.&nbsp;&nbsp; This solved my range problems.&nbsp; Installing a new antenna system was not an option due to budget.Have you noticed that the RE3s in your installation switchs antennas often or just occasionally?</blockquote>

[QUOTE="Alan Haworth, post: 213558, member: 13820"] It appears that problems I had were caused by the antenna arrangement of the previous installation. The RE3 replaced a RE2 system. The RE2 worked fine with two 3 dB gain mobile radio antennas (passive) at the operating frequency. The new receiver does not switch antennas solely on the strength of the RF signal from the antenna. ("The diversity reception technology minimizes the chances of signal dropouts by providing two separate antenna locations which are electronically chosen moment-by-moment based on signal strength and stability. "). My best guess is that the second condition (stability )for switching was not met. A friend that worked for the Union Pacific told me that the RE3 system was designed to detect and switch antennas based on "mulitpath" signal fade. I put a BNC "tee" on the "A" antenna port and connected both antennas to the same port. The "B" port was connected to one of the supplied antennas with a short extension cable to get it outside of the metal rack cabinet. This solved my range problems. Installing a new antenna system was not an option due to budget. Have you noticed that the RE3s in your installation switchs antennas often or just occasionally? [/QUOTE]

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