hi,
we have been using surplus GM300 Radios as repeater about one year and have
no problem with it.. very good radios. Either using back to back interface
from ebay or HLNB controller both work great.
We are planning to link our repeaters and need help for interfacing it. I
appreciate if anybody can help us.
What we have in the workshop left are one more HLMB and 2 unit back to
back interface cable that we bought from ebay.
regards
azam
On Fri, Mar 20, 2009 at 8:14 PM, aisendwight aisendwi...@yahoo.com wrote:
--- In Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com,
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
