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MCCSolutions

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OK, so I purchased MD782G Radios and I will be building a base station, a mobile repeater, a fixed repeater station, and installing them in my vehicles to work along with mobile DMR/UHF Analog Handhelds as well.

I though it may be interesting to share my experience since I haven't been able to find an example anywhere else where someone has taken two of these and made a repeater, maybe because there are cheaper options? Im not sure.

I have alot of left over UHF stuff from projects I did while overseas and have enough laying around to do something right off the bat. (Connectors, cables, duplexer, antennas, batteries etc..)

What I purchased so far:

6x MD782G (U2) Mobile Radios
1x Baofeng DM-1701
1x Baofeng DM-1801
1x Baofeng DM-V1
1x Hytera PC49 Back To Back Data Cable
1x Hytera PC37 USB Programming Cable
2x Hytera SM16A1 Handsets
4x DB26 Male Connectors
2x DB26-G2 Male Breakout Adapters
2x External Power Supply Cable Plug Connectors
2x 3m Hytera 12V DC Power Cable Cords

I plan to test them, back up their firmware and upgrade them right off the bat for testing when they arrive.

View attachment 73907
View attachment 73908
View attachment 73909
View attachment 73910

View attachment 73911

I may post more pictures of some ideas as far as the repeater goes over the weekend.

Im definitely interested in how they perform as repeaters and will be posting that, I think it will be helpful to others, especially as these come off lease and out of service from big cooperations and government and they become more available.
 
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ottosykora

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Sorry,I have just to smile, reading also your other post..mobile radios to be employed as repeater have been used together with a repeater controller, but if oyu intend to use MD78x for that and plan to use it as DMR as well, then I am kind of sorry for you..
 
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MCCSolutions

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ottosykora said:
Sorry,I have just to smile, reading also your other post..mobile radios to be employed as repeater have been used together with a repeater controller, but if oyu intend to use MD78x for that and plan to use it as DMR as well, then I am kind of sorry for you..
Click to expand...

"reading also your other post.."

Go back and read it again...

"mobile radios to be employed as repeater have been used together with a repeater controller"

Yes and without, and with a repeater, and with a PC, and in simplex, and with repeat and in VOX duck taped together lol

"but if oyu intend to use MD78x for that and plan to use it as DMR as well, then I am kind of sorry for you.."

Cool story, I said GMRS(which is analog) and its a project, you know an attempt, an trial, something to do before I get repeaters, which I have stated numerous times.... AND the MD782 is capable of repeating cross slot in SFR mode BY ITS SELF... And Hytera even has an instructional guide for using two MD mobile back to back for repeating, same interface as the repeaters, hence the engineering decision to include the interface int he first palace...

Do you have any actual constructive comments or suggestions or are you just another troll? Its getting old...
 
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MCCSolutions

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I really just wish I could delete everything I've ever posted on this forum because it has always turned out to be a complete waste of time...
 
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ottosykora

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You stated that you have number of MD78x in UHF band. So what the Hytera app note means is just transmitting on other band, thought no notes are included on how to solve radio interference. The filter will be small and lightweight in such case, but they need to be here.

There are number of use cases for the back to back cable, but the most frequently used one is where someone needs to connect 2 analog networks over internet together. As had to do while ago when my end users refused to give up their GP340 radios.

4pc RD625, on each side one in analog, other in digital mode. The digital repeaters have no antenna, connectors terminated. But they are connected via Internet to the other site where the digital signal is decoded and passed as analog to the second repeater in analog mode.
So we had 2 analog networks 160km distance.
But even this is absolute nonsense in my view, I have forced the users now to use ordinary PD78x in DMR and standard technology of 2019.
 
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MCCSolutions

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"You stated that you have number of MD78x in UHF band. So what the Hytera app note means is just transmitting on other band, thought no notes are included on how to solve radio interference. The filter will be small and lightweight in such case, but they need to be here."

Radio interference??? DMR uses a Duplexer just the same as any other FM RF. And the interface demodulates the audio containing both timeslots prior to the backplane when working with PTT/MIC pinouts, at that point its just like making an analog repeater(which again IS what im doing). They do include A/B slot pinouts which is why making an DMR repeater in FQ and out of FQ(NIX/RX-TX/NIX for FQ and RX/TX-TX/RX for out of FQ) is worth a try with these radios. And as already mentioned I have repeater controllers from other projects that can be utilized here, especially when dealing with audio issues.

"There are number of use cases for the back to back cable, but the most frequently used one is where someone needs to connect 2 analog networks over internet together. As had to do while ago when my end users refused to give up their GP340 radios."

Ok... And my last was with two CDM1550's, are we agreeing on something? :)

"4pc RD625, on each side one in analog, other in digital mode. The digital repeaters have no antenna, connectors terminated. But they are connected via Internet to the other site where the digital signal is decoded and passed as analog to the second repeater in analog mode.
So we had 2 analog networks 160km distance.
But even this is absolute nonsense in my view, I have forced the users now to use ordinary PD78x in DMR and standard technology of 2019."

Thats literally the same thing I've described here, whether the RX radio is Analog/Digital/ISM/Cellular/Zello whatever doesn't matter because the breakout is analog audio to interface with the TX radio. You can apply that principle to any repeater setup as long as you have the proper equipment to deal with the RF/RMI especially if your dealing within 10mhz without isolation, hence the use of a duplexer...

As for timeslot management and repeating linear in FQ, thats still something worth exploring up to a certain point. SFR Mode seems to be a more common sense approach though but thats intended for more of a Over-The-Hill relay not AO coverage. But again with two mobiles and equipment ranging $700-$1200 and Repeaters being $1000-$1600 its a meh for me, at some point its not worth it, but would be helpful for others I think.
 
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