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Kenwood TK-790 repeater
- Thread starter BCLG316
- Start date
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mmckenna
I ♥ Ø
Yes.
Issue is that most mobiles don't like running at 100% power with high duty cycles, like a repeater does. Heat is commonly an issue when mobile radios are used as a repeater transmitter. Often it's better for the long term life to run them at reduced power.
It isn't as simple as hooking the two together and putting two antennas up. You can use two antennas, but you need considerable separation between them to keep the receiver from going into desense. You can use duplexers to run one antenna, but they need to be tuned for the frequencies you are using.
You would also want a controller to take care of ID'ing and control.
Not an impossible task, but not easy, either. If any of this is going to be used for public safety, you really should be considering a dedicated repeater that is properly set up. If this is for amateur radio use, then go for it.
Issue is that most mobiles don't like running at 100% power with high duty cycles, like a repeater does. Heat is commonly an issue when mobile radios are used as a repeater transmitter. Often it's better for the long term life to run them at reduced power.
It isn't as simple as hooking the two together and putting two antennas up. You can use two antennas, but you need considerable separation between them to keep the receiver from going into desense. You can use duplexers to run one antenna, but they need to be tuned for the frequencies you are using.
You would also want a controller to take care of ID'ing and control.
Not an impossible task, but not easy, either. If any of this is going to be used for public safety, you really should be considering a dedicated repeater that is properly set up. If this is for amateur radio use, then go for it.
12dbsinad
Member
- Joined
- Mar 15, 2010
- Messages
- 1,953
Yes it can be done. However, the problem with inband VR's is that while one radio is receiving, the other is transmitting, which causes severe degradation of the receiving radio. In order to overcome this, you need filtering. The problem with filtering is, it only works on a specific tuned pair of frequencies. Which means the radios need to be dedicated to be soley used on those frequencies and nothing else.
mmckenna
I ♥ Ø
Good point, and for a mobile repeater, there isn't a lot of reasons I can think of to run 110 watts when the portable you will be talking back on only does 5.
svfd17
Member
Depending on range needed for the mobile to handheld radio, you could run that radio with just the exciter to keep de-sense to a minimum. I tried this experiment and it covered the 1 acre I live on with antenna 5' AGL.
Tim
Tim
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