 |
||||||||||||
|
Radio
Broadcast Technical Consulting and Sales |
|||||||||||
|
Diversity
Antenna Switch |
||||||||||||
|
Built by M. W. Persons and Associates, Inc. |
||||||||||||
 This is a rack-mounted relay-panel
which switches between two
antennas. It is typically used when a radio broadcast transmitter site has
two STL (Studio-Transmitter-Link) receive antennas. The switch will select
between the two antennas to get the best receive signal. In the photo
above, the top red light indicates that the receiver is getting its signal from
the highest antenna on the tower. The center green light indicates the
switch has selected the lower antenna. A pushbutton switch at the bottom
allows the user to manually select either antenna. One button push changes
to the other antenna. Another button push selects the first antenna again. |
 The system, as shown here, relies on a contact closure from a remote control system to tell it to do the switching. The best way to make this happen is to have the remote control system monitor the signal strength indicator on the STL receiver. The remote control should be programmed to give a momentary contact closure whenever the signal level drops below a preset threshold. The relay is a Tohtsu CZX3500 with N connectors. It is rated at 1000 watts @ 50 MHz, 600 watts @ 1 GHz, and 10 watts @ 4 GHz. Loss is 0.2 dB @ I GHz. This Diversity Antenna Switch is built-to-order to the customer's exact requirements. The example above sells for $525.00 plus shipping and tax. |
Back to
the Tech Tips page
Back to M. W. Persons page
|
Questions?
|
page last edited 05/11/2008
