--- In [email protected], "Romy" <ve7...@...> wrote: > > Sorry if this question might have been asked before already. > I am planning to use 2 GM300 Radios (M44GMC20D3AA) to build a simple repeater > in a back to back configuration . For those who used this configuration can > you please share any tips and ideas. How is the performance and reliability > of this configuration? I am also planning to use the repeater on Echolink. >
Hello Romy, one of my repeaters is made out of two Motorola M120's (the two channel version of the GM300). And it works great. As long as you place it on a place with good ventilation and place a fan on the back of the transmitting radio you should have no problems. You should also set the power of the transmitting radio to about 25 to 30 watts. All M44's can do 40 watts, but it's better to limit the power to reduce the risk of a TX transistor burnout do to excesive use. Remember that these radios are not 100% duty cycle. I use mine to provide comm service to a private ambulance company and it's worked well until now. A 15 amp power supply will be enough, (that's what I use) but you can use more power if you have it. About the interface, I assume you will be using the simple cable being sold in ebay. I use one of those also. Although I'm planning to use a more sophisticated controller later. One thing...are your radios 8 channel or 16 channel? if they are 8 channel models, I believe that you wont have to reassign functions to the 16 pin logic. But if 16 channels...you will have to change the function of pin 8 to enable it to send the COR signal nesessary for operation. That's the good thing about the 8 channel GM300, the two channel M120 and the single channel M10, you don't have to change anything, just plug and play. Finally, if you need programming software for the radios, let me know, I've got several versions, including the v.5 Version. Aisen
