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digtal repeater using only 1 narrowband frequency

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radioguy32

Member
Joined
Dec 14, 2010
Messages
30
We only have 1 narrowband frequency and need to move to a repeated signal. Unfortunately frequencies in our area are very hard to impossible to come by. The last 2 petitions filed by our neighbors were denied. Is it possible to move to a digital repeater using the 1 frequency we have? What I mean is wideband is 25Hz, narrow band is 12.5Hz and digital is 6.25Hz so the 1 narrowband frequency we have should be able to support 2 digital frequencies right?

Thanks,
 

trlrdrdave

Member
Joined
Dec 17, 2010
Messages
105
Location
decatur, al
Nope doesn't work that way. You still need 2 frequencies that are 6.25 khz each. There "are" simplex repeaters, but they are worthless in my opinion. Have you tried to get frequncies? Talked to a coordinator?
 

n5ims

Member
Joined
Jul 25, 2004
Messages
3,863
So you need a second frequency for your repeater and your neighboring agency also needs an additional frequency for their repeater and neither one can do so since there are no available frequencies. Setting up a repeater with the input on an adjacent channel to the output frequency will be very difficult and expensive to accomplish, if it can be done at all. You'll need extremely sharp filters to keep the transmit signal out of the receiver and vice versa and these will cost giga-bucks.

How about a novel idea, since repeaters need both an input frequency and an output frequency, why not use your frequency for an one and your neighbor's frequency for the other and you should have both an input frequency and an output frequency. With technology like MotoTRBO, two channels can be supported (not using the 6.25 kHz width, but time-slicing the 12.5 kHz width for an 'effective bandwidth of 6.25 kHz'). Your agency will get one timeslice and the other agency will get the other (both can be used at the 'same time' so it'll look like two seperate channels) and both should be happy.
 

radioguy32

Member
Joined
Dec 14, 2010
Messages
30
Thank you both for the information. I figured I would still need a second frequency. I have a radio company coming by on Thursday afternoon to review the options we have. They already examined the equipment and ran a few tests. I should get the results tomorrow at the meeting.

Thanks,
 
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