Simplex Base and Repeater co-location

[emtunderwood]

Can a Simplex Base Station and a Repeater be co-located at the same site at the same height same(TX Freq.) without issue?

 

[AK4PY]

Think about it... if your repeater has the same TX frequency as your base station receiver, how is it supposed to receive? What is it that you are actually trying to accomplish?

 

[K4EET]

Can a Simplex Base Station and a Repeater be co-located at the same site at the same height same(TX Freq.) without issue?

Yes, what are you trying to accomplish? If the simplex base station is the same frequency as the repeater’s transmit frequency, one would think you don’t need the simplex base station. The subscribers (base stations at other locations, mobiles, and portables) would all be configured to use the repeater.

If you are thinking your configuration would support two simultaneous conversations, that is not going to work. Besides, the simplex base station’s receiver’s front end would be blown out when the repeater transmits with the two antennas at the same height on the tower.

 

[emtunderwood]

Think about it... if your repeater has the same TX frequency as your base station receiver, how is it supposed to receive? What is it that you are actually trying to accomplish?

We have a bit of coverage issue and just honestly due to terrain and availablity of tower sites and locations. I yes now that I think about the question I asked... I'm a DUMA$$ SMH LOL. But we were wanting dispatch to be on the simplex and operations off the repeater.

 

[AK4PY]

We have a bit of coverage issue and just honestly due to terrain and availablity of tower sites and locations. I yes now that I think about the question I asked... I'm a DUMA$$ SMH LOL. But we were wanting dispatch to be on the simplex and operations off the repeater.

Depending on the model of repeater, you could have dispatch transmitting and receiving via wireline or similar directly from the repeater. That would accomplish the same thing as dispatch using a base station, and the field units would still use the repeater as normal.

 

[mmckenna]

We have a bit of coverage issue and just honestly due to terrain and availablity of tower sites and locations. I yes now that I think about the question I asked... I'm a DUMA$$ SMH LOL. But we were wanting dispatch to be on the simplex and operations off the repeater.

Yeah, not sure what you are trying to accomplish here.

If coverage is the issue, then adding a simplex base (fixed based in FCC terms), you are not going to gain anything.
Coverage is only going to be addressed by getting you repeater in a better location, or adding satellite receivers around your area.

This is a place where a professional (not a hobby radio site) will be able to properly design a system using legitimate propagation modeling tools will be able to design a solution to the issue that does not rely on guesswork or input from hobbyists. A professional consultant will cost more up front, but they will give you a guaranteed solution at the end. That'll mean you'll be paying once, and not going back to the City/County asking for more money to shotgun random solutions.

 

[freddaniel]

There is a real advantage to Dispatch being wireline or directly connected to the repeater, so it acted like a duplex base station. Should a mobile or portable talk while the dispatcher is transmitting, the dispatcher would be able to hear the mobile or portable "break-in" to the conversation. Otherwise, if the dispatcher used a Control Station, the dispatcher would not hear the mobile or portable while transmitting. A Control Station would be a good "backup" to a direct connected dispatch link, in case of a circuit failure.
The installer would simply disable the transmit mute feature on the dispatch control console.

 

[emtunderwood]

Yeah, not sure what you are trying to accomplish here.

If coverage is the issue, then adding a simplex base (fixed based in FCC terms), you are not going to gain anything.
Coverage is only going to be addressed by getting you repeater in a better location, or adding satellite receivers around your area.

This is a place where a professional (not a hobby radio site) will be able to properly design a system using legitimate propagation modeling tools will be able to design a solution to the issue that does not rely on guesswork or input from hobbyists. A professional consultant will cost more up front, but they will give you a guaranteed solution at the end. That'll mean you'll be paying once, and not going back to the City/County asking for more money to shotgun random solutions.

Our city/county pays for nothing not even the radio system. But makes sure they use everyone elses radio systems and no cost to them..
It a piss-poor Sh!tty situation honestly... It's sad!!

 

[kayn1n32008]

Think about it... if your repeater has the same TX frequency as your base station receiver, how is it supposed to receive? What is it that you are actually trying to accomplish?

Using circulators and 0khz separation hybrid combiners, you absolutely can do this. It's incredibly lossy, and if your feedline or antenna issues cause high swr, you're going to cook your receiver.

 

[prcguy]

There is a real advantage to Dispatch being wireline or directly connected to the repeater, so it acted like a duplex base station. Should a mobile or portable talk while the dispatcher is transmitting, the dispatcher would be able to hear the mobile or portable "break-in" to the conversation. Otherwise, if the dispatcher used a Control Station, the dispatcher would not hear the mobile or portable while transmitting. A Control Station would be a good "backup" to a direct connected dispatch link, in case of a circuit failure.
The installer would simply disable the transmit mute feature on the dispatch control console.

In this case you could even program the repeater for half duplex. Dispatch will hear all calls from mobiles, all mobiles will hear dispatch. Scanner users will be sad because they would have to program the mobile side separate and would have spotty reception compared to all mobiles passing through the repeater.