We are currently up and running in Phase I of the system plan.
Phase II is currently being configured and tested.
Phase III is planned for completion by late 2001 or early 2002.
The N2CKH/R 53.430 MHz (-1Mhz) repeater consists of the following components:
We are currently up and running in Phase I of the system plan.
Phase II is currently being configured and tested.
Phase III is planned for completion by late 2001 or early 2002.
In General:
This repeater system is based on a GE Master II Series "M" commercial mobile radio. The GE Master II family of transceivers is a fairly rugged radio from the early 80's that was retired from service. It has been re-crystalled, retuned, and appropriately modified for use as an amateur repeater. The system uses a set of Db Products DB4030 30-54Mhz 4 Cavity duplexers factory tuned for the frequency pair and a Micro Computer Concepts RC-1000 repeater controller.
Phase I of system integration was completed whent he system went on-the-air as N2CKH/R in late April of 2001. Coordination was granted on July 26th, 2001.
Phase II of the system integration with interface the RC-1000 dedicated controller with a rack mounted IBM PC Server 325 266Mhz Pentium Pro having 64MB RAM, two 4.5GB hard drives, CD-ROM, ethernet port with a digital/analog I/O control line interfaced and Soundblaster cards running MS-Windows and custom software written by N2CKH for additional control and signaling capabilities, DX-Cluster voice spots and NOAA EAS/S.A.M.E. severe weather alerting. Additional peripheral equipments will also be implemented.
Phase III of the system integration will swap out the RC-1000 controller for a Link Systems controller and add a 2nd PC Server 325, a 200Mhz unit one 64Mb RAM and one 4.5GB drive and CD-ROM, ethernet port, this one will be running Red Hat Linux v6.2 to act as the node controller for an Internet Repeater Linking Project (IRLP) interface.
The Details:
The repeater's input frequency is 52.430 MHz; its output is 53.430 MHz, and a PL tone of 131.8 Hz is used to activate the repeater as needed due to band conditions. A 131.8 Hz tone will usually be present on the repeater's output at all times. Those without PL who have DTMF capabilities can enter "*320" which will temporarily take the repeater out of PL until 20 seconds of inactivity has elapsed.
Receiver Specfications
| Sensitivity: | 0.35 microvolts for 12 dB sinad |
| Selectivity: | front end +/- 1 MHz, IF 12 kHz |
| Audio level and impedance: | 8 Ohm spkr & 600 Ohm 1 V P- |
| Inter modulation: | -80 dB |
| Squelch sensitivity: | 0.2 microvolt open |
Transmitter Specifications
| Output power: | 100 watts nominal. |
| Spurious & harmonic emission: | 85 dBc minimum |
| Emission type: | 16F3 |
| Duty Cycle: | continuous duty at rated output power |
| Maximum deviation: | +/- 5 kHz |
General Specfications
| Frequency stability: | +/- 5 PPM at -5 to +55C (+23 to +131F) |
| Size: | 13.5" w x 12.1" d x 4.1" h |
| Power requirements: | 13.8 VDC @ 20 amp max. |
| Panel: | Squelch & Volume, indicators for power, COS, tone & PTT, speaker out, receiver and transmitter antennas, phone line. | Console PTT/Local use | PTT Test. PTT Disable. No local mic. |
Click here for Exciter/Amplifier details
Click here for Receiver details
Click here for System Duplexer/Antenna/Power Supply details
Click here for photo's and details on the PC Servers
Click here for future enhancement details
For information on my commercial amateur radio products please click here to send e-mail or visit the main website.
Entire contents Copyright © 1999-2001 by Stephen B. Hajducek, N2CKH. All Rights Reserved Worldwide.