Anyone using this?

[nokones]

You should loose the LMR400 and replace with something else. Even RG-214 would be a better choice.

Not really, at least according to the specs between RG-214 and LMR-400. If I was a HAM dude running HF through the cable than yes, I would probably be better off with the RG-214. Since, I'm pumping UHF freqs through the LMR-400, the LMR-400 has less attenuation with 2 meter freqs and above over the RG-214.

I think I'll stay with the LMR-400.

 

[KevinC]

Not really, at least according to the specs between RG-214 and LMR-400. If I was a HAM dude running HF through the cable than yes, I would probably be better off with the RG-214. Since, I'm pumping UHF freqs through the LMR-400, the LMR-400 has less attenuation with 2 meter freqs and above over the RG-214.

I think I'll stay with the LMR-400.

I think @prcguy is referring to possible PIM using LMR400, not the power handling capability.

 

[prcguy]

I think @prcguy is referring to possible PIM using LMR400, not the power handling capability.

Yes, LMR cables with foil/tinned braid should be avoided in full duplex systems.

 

[JamesBrox]

I've the same Laird FG4605 5 dB Omni Antenna and the Laird Y4506 on a DX 2 position switch (MFJ-1702C) for my base ops. Nice setup sir.

 

[JamesBrox]

50w into a duplexer and 30w out would be 2.2dB of loss and a little too much for even a lousy flat pack. I would have a duplexer checked or tuned in this case.

The Bridgecom has two 40w radios in it. So maybe 31.8 watts output isn't too bad after the duplexer......idk.

 

[prcguy]

The Bridgecom has two 40w radios in it. So maybe 31.8 watts output isn't too bad after the duplexer......idk.

40w in and 31.8w out is .996dB loss in the duplexer and cables, very good if true.

 

[JamesBrox]

If true? I never lie to someone I don’t know sir. Here’s the reading during CW ID.

 

[JamesBrox]

If true? I never lie to someone I don’t know sir. Here’s the reading during CW ID.

That’s with an adapter to fit the swr meter.

 

[prcguy]

If true? I never lie to someone I don’t know sir. Here’s the reading during CW ID.

How much is the repeater transmitter putting out before the duplexer? Can't know the duplexer loss without that. Typically a flat pack duplexer has about 1.5dB loss, so you would need 44.91 watts in to get 31.8w out @ 1.5dB loss. Then there is the question of the Surecom accuracy.

 

[nokones]

Here is the performance of my Repeater System.

EMR Corp. Duplexer Performance Data Sheet


Here is the EMR Corp Performance Chart


Here is a snapshot of my recent calibrated Bird 43 and a 100 Watt calibrated slug showing 40 watts into the duplexer:



Here is a snapshot of 31 watts RF power out of the duplexer:


Here is a shot of the reflected power of approx. .3 watt using a 10 watt calibrated slug:


My VSWR was converted to less than 1.07:1

I am not seeing the need to change anything at this point. Any change would not be measurable in the Farz.

 

[KF0NYL]

We are using a Bridgecom BCR-40U currently for our GMRS repeater. It's nothing fancy but it works. A Bridgecom definitely can't compare to a Quantar. We opted to buy the BCR40U without the built in duplexer since we had a good duplexer on hand. One of our club members took the duplexer to his work and made sure it was properly tuned.

I suggest going over to the mygmrs.com forum. The Baofeng repeater did not get favorable reviews. And most guys that built repeaters using two Wouxun KG-1000G mobiles have since went to using an actual repeater.

 

[prcguy]

Here is the performance of my Repeater System.

EMR Corp. Duplexer Performance Data Sheet
View attachment 171966

Here is the EMR Corp Performance Chart
View attachment 171967

Here is a snapshot of my recent calibrated Bird 43 and a 100 Watt calibrated slug showing 40 watts into the duplexer:
View attachment 171968


Here is a snapshot of 31 watts RF power out of the duplexer:
View attachment 171969

Here is a shot of the reflected power of approx. .3 watt using a 10 watt calibrated slug:
View attachment 171971

My VSWR was converted to less than 1.07:1

I am not seeing the need to change anything at this point. Any change would not be measurable in the Farz.

The Bird is showing 40w into the duplexer and 30w out which is 1.249dB loss and close to what the factory spec says. However, a Bird 43 freshly calibrated is +/- 5% accuracy so it can be off +/- 2 watts when measuring 40w. And always measure power with a good 50 ohm load right on the meter, any VSWR even small will skew the power readings.

 

[nokones]

I suggest going over to the mygmrs.com forum. The Baofeng repeater did not get favorable reviews. And most guys that built repeaters using two Wouxun KG-1000G mobiles have since went to using an actual repeater.

The Wouxun KG1000G Plus radios do not have any shielding and the transmitting radio will desense the receiving radio, big-time by being adjacent to each other. In order for this type of a repeater package be somewhat operational, you will need to separate the radios many many feet apart and put the two radios in their own box that will shield the two radios from each other.

In this repeater package configuration a portable radio signal will become desensed at about a half-mile from the repeater antenna and a 50-watt mobile radio signal will become desensed at about a 1 1/4 mile from the repeater antenna.

 

[DeoVindice]

Here is the performance of my Repeater System.

EMR Corp. Duplexer Performance Data Sheet
View attachment 171966

Here is the EMR Corp Performance Chart
View attachment 171967

Here is a snapshot of my recent calibrated Bird 43 and a 100 Watt calibrated slug showing 40 watts into the duplexer:
View attachment 171968


Here is a snapshot of 31 watts RF power out of the duplexer:
View attachment 171969

Here is a shot of the reflected power of approx. .3 watt using a 10 watt calibrated slug:
View attachment 171971

My VSWR was converted to less than 1.07:1

I am not seeing the need to change anything at this point. Any change would not be measurable in the Farz.

It's not a VSWR issue. Braid over foil shielding as used in LMR-400 can and will create noise and passive intermod.

 

[Coffeemug]

BTECH GMRS-RPT50 50W GMRS Repeater with Built-In Duplexer and Auto-ID ‣ BaoFeng Tech & BTECH Radios

BTECH GMRS-RPT50 50W GMRS Repeater, Plug-and-Play: Features smart duplexer (All 8 Repeater Pairs), intuitive user interface, versatile power options, and built-in auto ID using MCW Morse code. ‣ $1,499.89 ‣ Purchase, Software, and Support for BaoFeng and BTECH Radios

baofengtech.com

Just curious if anyone has tried this repeater, lately. I know it made a splash about six months ago for being sold as a true 50w gmrs repeater. But then I read it was getting not so favorable reviews. I'm currently using a Bridgecom BCR-40DU w/ 31.8w output and it does fine but thinking a 50w repeater may help me get more range. Maybe the baofengtech folks has addressed the potential flaws. Thanks
James
WRXU693

I understand that BTECH GMRS RPT 50 mic is just to navigate through the menus, and not for voice transmissions. Then again, that's what I heard on a YouTube channel, which I will not disclose. To me, the BTECH GMRS RPT 50 looks like a nice easy to use repeater for a group that needs coverage in a certain area, but that's my opinion.

 

[KF0NYL]

The Wouxun KG1000G Plus radios do not have any shielding and the transmitting radio will desense the receiving radio, big-time by being adjacent to each other. In order for this type of a repeater package be somewhat operational, you will need to separate the radios many many feet apart and put the two radios in their own box that will shield the two radios from each other.

In this repeater package configuration a portable radio signal will become desensed at about a half-mile from the repeater antenna and a 50-watt mobile radio signal will become desensed at about a 1 1/4 mile from the repeater antenna.

And there is also the duty cycle and heat issues that need to be accounted for.