CommScope - DB630

[wqzw301]

Hello,
Is the
CommScope Db630 a good full duplex repeater antenna?
I have an icom fr4000 repeater. At the moment I can not mount my db-404b.
I know the radiating element is brass and not copper. But it looks like a unity gain version of a stationmaster....
Thank you for any help.
D

 

[prcguy]

Hello,
Is the
CommScope Db630 a good full duplex repeater antenna?
I have an icom fr4000 repeater. At the moment I can not mount my db-404b.
I know the radiating element is brass and not copper. But it looks like a unity gain version of a stationmaster....
Thank you for any help.
D

Its got 0dBd gain, why would you want one? For the price of a DB630 you could get several Laird FG4607 7dB gain or many others that would be a much better choice.

 

[wqzw301]

Its got 0dBd gain, why would you want one? For the price of a DB630 you could get several Laird FG4607 7dB gain or many others that would be a much better choice.

Thsnks! I do have a laird fg4607. I didn't think it could handle full duplex?

 

[prcguy]

Thsnks! I do have a laird fg4607. I didn't think it could handle full duplex?

Yes, they are probably a thousand or more used on repeaters every day.

 

[wqzw301]

Yes, they are probably a thousand or more used on repeaters every day.

Thanks! You always solve my problem! I'm glad you answered.

 

[Project25_MASTR]

Its got 0dBd gain, why would you want one? For the price of a DB630 you could get several Laird FG4607 7dB gain or many others that would be a much better choice.

Until you are dealing with a FG4607 on the roof of a warehouse and begin to find a lot of coverage issues that immediately go away when you swap to the DB630 (or a single Telewave ANT450D).

 

[prcguy]

Until you are dealing with a FG4607 on the roof of a warehouse and begin to find a lot of coverage issues that immediately go away when you swap to the DB630 (or a single Telewave ANT450D).

Sounds like a very local or property restricted repeater and I've seen lots of problems with onsite repeaters with dead spots all over the 10 story building its supposed to cover or heavily shielded areas of a property that the roof mounted repeater antenna overshoots a bit, but that was on a huge all metal roof and everything underneath suffered.

I'm using high level wide area repeaters and going for full quieting from hand helds at 75mi out. That needs altitude, lots of gain and downtilt if above 1000ft average terrain. I guess we should ask the OP if he is going for wide area maximum range or if this is an onsite repeater and only needs a small coverage area. I was assuming wide area.

 

[Project25_MASTR]

Local is correct. The bigger issue is this is an issue I've had to resolve on hundreds of warehouses. Some one thought high power, high gain it'll work. Two years later, it's not working so let me come in and instead of just selling a new repeater (which is what the sales group attempted) lets actually optimize. 100% of the time backing the power down on the repeater (10-15W) and running a unity gain antenna design fixed most of the coverage issues.

 

[prcguy]

Local is correct. The bigger issue is this is an issue I've had to resolve on hundreds of warehouses. Some one thought high power, high gain it'll work. Two years later, it's not working so let me come in and instead of just selling a new repeater (which is what the sales group attempted) lets actually optimize. 100% of the time backing the power down on the repeater (10-15W) and running a unity gain antenna design fixed most of the coverage issues.

Over the years I've had to deal with upside down ground planes on hospital buildings and in one case where they needed little numb pagers to work everywhere in a 10 story building I put a 100w amp and 10dB Yagi on the roof pointing straight down. Worked great and that was before RF exposure rules were widely known, oops. But I prefer working with wide area repeaters off tall mountains.

 

[wqzw301]

Over the years I've had to deal with upside down ground planes on hospital buildings and in one case where they needed little numb pagers to work everywhere in a 10 story building I put a 100w amp and 10dB Yagi on the roof pointing straight down. Worked great and that was before RF exposure rules were widely known, oops. But I prefer working with wide area repeaters off tall mountains.

I have seen upside down ground plane antennas in the sub-basement in the hospital I work in.

 

[prcguy]

I have seen upside down ground plane antennas in the sub-basement in the hospital I work in.

I would think a basement ground plane would be right side up and one on the roof would be upside down to keep the best radiation pattern within the building.

 

[wqzw301]

I would think a basement ground plane would be right side up and one on the roof would be upside down to keep the best radiation pattern within the building.

I always figured they were put up by the carpentry department before cellphones...