Ok, this is going to sound crazy, but I'm trying to build something and hitting a roadblock. I'm trying to bridge VHF and UHF with a CDM1550 VHF and a CDM1250 UHF. Eventually this gateway will be used either to allow repeater like input from a VHF handheld into the gateway and bridge it over to our existing UHF repeater system.... then back again when the UHF system is activated as normal, or as a fire ground bridge on simplex, but would still need to run both ways. Yes..... I bought the Amazon repeater cable, which did nothing. My GUESS is it is the program of the accessory port on the radios..... but I have never messed with Motorola programming. Any and all advice would be appreciated.
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Crossband repeater cdm
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RFI-EMI-GUY
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I find the Pyramid SVR200 application notes to be helpful in finding the necessary TX, RX, PTT and COR connections and SW configurations of various radios. You might check there.
prcguy
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I don’t have the answer your looking for but will mention if this is for commercial service you might want to check the legality. All my commercial repeaters including mobile had to be listed on my license as repeaters.
Its public safety, not commercial.
RFI-EMI-GUY
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crossband to/from a repeater channel creates a problem where the (in your case) UHF repeater hang time (tail) prevents the mobile from receiving the VHF portable from responding. The SVR200 has a priority interrupt timer to facilitate the prompt reply from a portable. You may be better off with an SVR200V instead of the VHF CDM.
prcguy
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For Amateur no license needed beyond the hams license. Commercial and public service probably need this cross band repeater specifically listed on the departments license.
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Plus this is not a do it yourself project.
You have to have Frequency Coordinators, then get a FCC License then you need to have a Professional Radio Shop set this up and fine tune it.
The other question you have to ask yourself Your Words not ours This is public Safety that means you would be held ACCOUNTABLE for any and all failures. As an EMT would you recommend an EMT giving Fentanyl in the field, how about Morphine, you get the idea.
You have to have Frequency Coordinators, then get a FCC License then you need to have a Professional Radio Shop set this up and fine tune it.
The other question you have to ask yourself Your Words not ours This is public Safety that means you would be held ACCOUNTABLE for any and all failures. As an EMT would you recommend an EMT giving Fentanyl in the field, how about Morphine, you get the idea.
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MTS2000des
5B2_BEE00 Czar
What he said. Public safety LMR is no place for "do it yourself and save". Remember these words: it's all good, until it's not.
TampaTyron
Beep Boop, Beep Boop
There were drop downs in the Waris software in the accessory connection for I20R? or similiat controller. I think you needed to specify TX or RX radio or maybe bidirectional? It has been almost 20 years since I have messed with one of those.
TT
TT
I've used this guys product in the past (LONG time ago) and it worked as intended. Same application, VHF to UHF with two CDM's. He included programming instructions with the order.
+1 on this. Used these to make portable repeaters to respond to hurricanes, floods, and oil spills using these devices and CDM series Motorola radios. CDM1250 and CDM1550 mostly, but some were in-band repeaters while others were VHF/UHF cross-band repeaters. Actually saw some of those going for ~$3000 online recently, could tell they were the same kits as we had some unique construction using what we had on hand at the time.
They worked very well for extending radio comms miles down the Yellowstone River, and Gulf State oil spill responses along the beach. You can get version with CDM series accessory connectors as well as XPR Motorola Trbo 26 pin connectors, but they only work in analog mode. These boxes then require programming the accessory pins appropriately to work. Great seller and engineering company. Metzler Engineering or something like that.
Project25_MASTR
TX-COMU
For the application,
I would honestly go with something like a JPS ACU-T, ACU-M, or RSP-Z2. Little more on the pricey side but it is a product specifically built for doing what the OP is wanting to do.
I would honestly go with something like a JPS ACU-T, ACU-M, or RSP-Z2. Little more on the pricey side but it is a product specifically built for doing what the OP is wanting to do.
Project25_MASTR
TX-COMU
Eh. We've had a lot of audio level issues with the Collcoms that have been ID'd for over a decade now and still haven't been resolved. Fine if you are using the same radio with the same audio settings but all bets go out the window the second you start messing with mixing radios from different vendors. Unfortunately, I've run into multiple situations where Kenwood's high impedance audio, mixing with a patch between Motorola and Viking radios just causes all sorts of audio issues that you can't adjust for with the Collcomm. There is a reason JPS is the standard for most Communications Units.
Whatever, we didnt sell the ncs250' s but one of good Customers got them and are going from XTL2500 800 to KENWOOD VM5XXX work perfet out of the box.
but - they did have one more of them that was an older version and it did have audio issues as you mentioned, so I have to say they fixed the problem on the new versions
but - they did have one more of them that was an older version and it did have audio issues as you mentioned, so I have to say they fixed the problem on the new versions
the NCS250 and the JPS are both overkill for this use case. Simple $90 interface will handle it.
