K2MAK Repeater System

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The current repeater system information:

  • Motorola Digital MSF5000 110 watts continuous duty repeater (output set to 90 watts)

  • Pacific Research RI-300e controller

  • (2) Motorola Spectra TAC UHF receiver

  • RFS Celwave PD1151-2 stationmaster antenna 8 dBd w/3 degree down tilt @ 1100-ft for TX

  • (2) Decibel Products DB-413 13 dBd exposed dipole array, 1 north, 1 south @ 900-ft for RX

  • 150 ft 1 5/8 inch Andrews Heliax connecting the TX antenna

  • 180 Ah battery backup

  • 1 UHF GM300 UHF link radio connected to a 3 element beam

  • 1 VHF M120 link radio for the 2m ARES net

 

Brooklyn Repeater

  • Transmit = 449.775 Receive = 444.775  CTCSS Tone is 88.5

  • Output Power is 50 watts out of duplexer.

  • Amplifier is a TPL repeater amp.

  • Antenna is a Hustler G6 440 7 db fiberglass stick.

  • Duplexer is a Celwave PD526-4 BP/BR 6 can unit.

  • Bandpass on the TX and RX by TX/RX Inc.

  • Preamp is ARR PD432G ( 16 db gain )

  • Cable is Andrews 1/2" LDF4-50B @50 ft run.

  • All this equipment is mounted on a 6-ft repeater cabinet.

The repeater

 
 

The repeater coverage area is @ 60 miles from a 35w mobile in all directions from Midtown Manhattan.

The repeater was moved from the 87th floor to the 83rd floor in 2005.  The new location is air conditioned 24/7 and is much more secure then the original location.

The new configuration also allowed us to separate the TX and RX antennas.  With this new setup, thanks to Alex KQ2H, the repeater has great receive because of the high gain on the rx antennas and a 16 dB preamp on the receiver. 

The next project now is to install a second receiver down in Brooklyn to provide better local coverage in Brooklyn. This receiver will be voted in at the main site eventually.

This is an on going project and any help would be appreciated.

Updated December 22nd, 2006

 

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