[South Florida DX Association] Repeater Report - October 17,
2006 1330 Hrs
Bill Marx
bmarx at bellsouth.net
Wed Oct 18 19:18:30 EDT 2006
This News from Elliot - KB2TZ
Repeater Report: October 17, 2006 1330 Hrs
I Installed a Receiver preamp today. This preamp is made by Motorola and is
specifically designed for our receiver. It mechanically plugs directly into
the receiver's front end helical resonator chain between stages 3 & 4. We
now have a 6dB improvement in sensitivity over what we had up until now.
This is not magic, it's 6 dB. It will "fill" in some of the holes that we
had and in effect increase coverage somewhat. If you still try to access
the repeater with 6 nanowatts at a distance of 60 miles, you will still not
"get in."
The repeater went through an entire PM check.
Model: Motorola MSR2000
Transmit power @ amplifier output: 110 Watts
Transmit power @ Duplexer output: 85 watts
Reflected power @ Duplexer output: ½ watt
Receiver sensitivity: .21 for 20 dB quieting
System desense: 0 dB
Repeater Squelch Gate set at: 12 dB quieting
Transmit and receive frequencies set to spec
Transfer audio ratio: 1.2:1
IDC: +/- 4.9KHz. @ 400 Hz.
Transmission line loss @ 147 MHz: .85 dB
Antenna Gain: 5.25 dB Omni
Center of radiation: 155 feet AGL
KB2TZ
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