Welcome to KC5GNG's Ham Radio Page


Please check out some of my pictures from SSTV.

Here are some tools that I have put together.

Vertical and Dipole Antenna Calculation Tool

Yagi Antenna Calculation Tool

Links to other pages of interest:

http://www.qsl.net/n5tim/ Awesome page for keeping up on those special events

http://www.intellicast.com/LocalWeather/World/UnitedStates/SouthCentral/Texas/Dallas/Radar/ Intellicast Radar for Dallas

http://www.k5kj.net/ Storm Spotters paradise, great information for storm spotters.

http://www.qsl.net/ Please visit my web page hosts main page. If interested please help with this great contribution to ham radio information.

http://www.qrz.com/ Find that stations address so you can get that QSL card.

http://www.arrl.org/ ARRL main web page.

http://www.dumbassdrivers.com/ Interesting idea.

http://www.qsl.net/garc/ Garland Amateur Radio Club web page.

Garland Amateur Radio Club K5QHD Repeater Information


The 146.66- repeater is a GE Mastr II mobile radio modified for repeater operations. These modifications can be found many places on the Internet. In the current configuration of the repeater we are running approximately 70watts out of the transmitter. The radio can run up to 150 watts. The receiver is running approximately a 0.1 microvolt sensitivity. This repeater has general coverage of about 45 to 50 miles with a mobile rig and about 7 to 10 with a handheld. This repeater is an open repeater with no PL at this time, there maybe one added for the purpose of eliminating some local intermod. The PL will have a bypass code using a DTMF code so that all can use the repeater.

 The 442.700+ repeater is co-located with the 146.66 and is also a GE Mastr II radio, however it is a true repeater style GE Mastr II. This repeater is running approximately 60 watts out of the transmitter and the receiver also has about a 0.1 microvolt sensitivity. The 442.700 repeater has about the same range as the 146.66 repeater.

The cavities used for the 146.66 repeater are Wacom cavities in the standard 4, Bandpass-Bandreject (BP-BR), configuration with 2 on the transmit side and 2 on the receive side. The cavities used on the 442.700 repeater are modified commercial cavities donated by Alcatel.

These repeaters are controlled with a RLC-3 controller from Link Communications. This controller is configured with the autopatch, DVR, and analog I/O cards for options. With this setup we have the capabilities of autopatches from both repeaters and linking capabilities. The I/O card is going to be used to notify club members over the air of people at the repeater site, possible high temperature problems in the cabinet, and will soon be monitoring the UPS system we will be putting on the repeater.

The type of antennas used for both repeaters are commercial DB Products antennas. These antennas were modified to the ham frequencies by replacing the phasing harnesses. These antennas are phased folded dipoles that are semi-directional based on the mounting position of the folded dipoles on the mast. In the current configuration of both our antennas we are omni-directional.



146.66 Repeater Specs.

442.70 Repeater Specs.


GE Mastr II mobile

GE Mastr II Repeater

Output Power

70Watts (at Transmitter)

60Watts (at Transmitter)



Modified commercial


DB224 (Decibel Products)

DB410 (Decibel Products)





Approximately 100ft above the ground

Approximately 80ft above the ground


Baylor Hospital in Garland

Baylor Hospital in Garland


RLC-3 (port-1)

RLC-3 (port-2)

Power Supply

GE Repeater Power Supply

GE Repeater Power Supply


1.4 to 1

1.5 to 1


Photo or plots:

Photo of DB224

Decibel Products Antenna

Photo of DB410

Decibel Products Antenna


Plot for 146.66 Cavities


Overall Block Diagram of the K5QHD repeater system.


For more information contact Mark (KC5GNG) Communications Officer GARC 1999-2000 at [email protected].