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uhf to 800 repeater
- Thread starter ssd
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clanusb
Member
what are you planning to do with the set up first of all...that would help us with the list..
b7spectra
EMS Dispatcher
You are also going conventional not TRS on the 800, right?
n5ims
Member
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- Jul 25, 2004
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Please let me know if I understand correctly what you're trying to accomplish. Basically, you're trying to link your UHF frequency to your 800 MHz frequency. What's heard on one is also heard on the other.
A transmission on your UHF frequency (e.g. 456.780) is received and you want it repeated to your 800 MHz frequency (e.g. 867.000).
A transmission on your 800 MHz frequency (e.g. 867.000) is received and you want it repeated to your UHF frequency (e.g. 456.780).
Or is it more complex than this (for example, either or both of your frequencies use repeaters and are not strictly simplex)?
A transmission on your UHF frequency (e.g. 456.780) is received and you want it repeated to your 800 MHz frequency (e.g. 867.000).
A transmission on your 800 MHz frequency (e.g. 867.000) is received and you want it repeated to your UHF frequency (e.g. 456.780).
Or is it more complex than this (for example, either or both of your frequencies use repeaters and are not strictly simplex)?
n5ims
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The problem I see is when you get a signal on one of the frequencies, it will retransmit on the other band. This retransmission will then capture the receiver of the original receiver and lock up both channels. For example, your setup gets a signal on the UHF frequency. It then retransmits that onto your 800 MHz frequency. This will cause the other repeater, the one with the 800 MHz input, to retransmit the repeated transmission back to the UHF channel. At that point, you'll have both repeaters on and repeating the same signal back and forth, causing neither frequency to be of any use (since the repeated signal on both will be the strongest signal to the both repeaters).
This situation can be handled, but you must be aware of it and program the controllers for both repeaters accordingly. The easiest solution may be to simply lock one out one repeater while the other is transmitting.
You may want to try something like this SVR-250 Vehicular Repeater from PYRAMID COMMUNICATIONS which is designed to do what you're looiking for, but in a mobile environment. It should be quite easy to convert this to your base environment.
This situation can be handled, but you must be aware of it and program the controllers for both repeaters accordingly. The easiest solution may be to simply lock one out one repeater while the other is transmitting.
You may want to try something like this SVR-250 Vehicular Repeater from PYRAMID COMMUNICATIONS which is designed to do what you're looiking for, but in a mobile environment. It should be quite easy to convert this to your base environment.
From what I'm reading, if he's running the cross band repeaters at different sites, with a significant distance between them, and it's simplex on both UHF and 800, he shouldn't have to worry about the repeaters capturing each other. On the other hand, if the frequencies are repeated, he would only need one repeater to link the two.
n5ims
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I agree that if the two sites were seperated by a significant distance, there would be less chance of them capturing each other, but I understand that they're trying to accomplish this link at a single location. This is why I recommended the mobile repeater solution, since it is designed to relay a mobile radio on one band to a portable radio on another.
n5ims
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While that may solve the lockup issue, this won't do what you're intending (allow simplex users on 800 to communicate with simplex users on UHF) since folks would need to switch frequencies, depending on who they're talking to. Since these appear to be repeater input/output pairs for the frequencies (although 800 MHz normally uses 45 MHz splits), this may compound the issue (or simplify it, depending on the situation).
If the UHF and 800 MHz frequencies are repeaters and not simplex as you indicated earlier, doing what you ask in the quoted post would simply lock both repeaters and not fix the issue. However, this may make the solution easier. You may be able to modify the existing repeaters to add make it so that if a signal appears on either the UHF or 800 MHz input frequency, that signal will be repeated on both of the repeater's output frequencies (true linking of the repeater pairs). This linking may be full time or switchable, depending on how you program it into the controllers.
jim202
Member
I agree. This thread was starting to turn into monster. Cross band two simplex freqs-piece of cake.
Two mobile radios with proper acc connector and a RICK set as bi-directional repeater. I have done this many times. Don't blow this up to something that shouldn't be.
code3cowboy
Member
What are you trying to link?
Why not link Gold 4 to Gold 20? That is what CLEMARS is there for. The infrastructure already exists in your area.
http://www.calema.ca.gov/WebPage/oeswebsite.nsf/PDF/CLEMARS%20Plan/$file/CLEMARS_03_Plan.pdf
Why not link Gold 4 to Gold 20? That is what CLEMARS is there for. The infrastructure already exists in your area.
http://www.calema.ca.gov/WebPage/oeswebsite.nsf/PDF/CLEMARS%20Plan/$file/CLEMARS_03_Plan.pdf
I believe it is because he's trying to achieve interoperability between radios at two specific sites. Sounds like he's running UHF simplex at one distinct site and 800 simplex at the other. This is why my statement about distance alleviating the fear of the repeaters capturing each other is there.
I don't think it's public safety. Sounds more like private security to me.
clanusb
Member
he's probably a community services officer. they go around and do the paper work at minor traffic accidents, and all the other less important calls that don't require a sworn officer. the program is ran by the police/sheriff department.
no gun.
no offical department badge.
no vest.
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