MTR2000 Duplexer

[Ronster]

I would appreciate any insight concerning the MTR2000 duplexer. After considering the EMR 653160 MC, it seems there is confusion as to the frequencies it can handle. At any rate, I know so very little about duplexers and this unit appears to be a 250 wattage rating, which is an overkill but the price is $525. This is in my price range I projected for this repeater build. As I have stated in an earlier post, I will be using CDM750’s at 25 watts. I am more concerned with trying to get good duplexer rather than a cheap duplexer without breaking the bank.

Comments appreciated!

Ron, WRPJ594, K0AAJ 

[Radioguy7268]

Motorola repackaged a nice Celwave bandpass/band reject duplexer with most MTR2000's, although that was not the only possible "MTR2000 duplexer" that might have existed.

If you have a link or more detailed description, it might help to figure out which one you're looking at.

EMR makes some decent equipment, but the model you have listed is a basic "flatpack" compact mobile duplexer which is a Notch style - not the greatest duplexer for use in a high quality repeater install.

Any duplexer requires tuning to operate on your exact frequency pairs. The Celwave MTR2000 duplexers sold by Sunny Communications (Used-Radios.com) for $525 include tuning. That duplexer is the real deal.

[Ronster]

Celwave RFS Motorola UHF Duplexer 0185417U05 440-470 Mhz Quantar MTR2000
from Used-Radios.Com

[WROZ250]

4 hours ago, Ronster said:

 I am more concerned with trying to get good duplexer rather than a cheap duplexer without breaking the bank.

A quality duplexer is, or can be expensive, but it's what you want.  Stay away from the 'flat pack' mobile devices.  They do work, but these days you can never be sure of where and how they are built.  You are looking for low insertion loss and at least 80dB (or more) isolation.

The aforementioned (used) Cellwave duplexer mentioned by a previous poster looks like a good deal.  Most new duplexers of that grade cost twice if not three times the price.

[PACNWComms]

1 hour ago, Ronster said:

Celwave RFS Motorola UHF Duplexer 0185417U05 440-470 Mhz Quantar MTR2000
from Used-Radios.Com

+1 on this. Sunny Communications a.k.a. Used-Radios.com is a great company to deal with, and will get you what you need. Have dealt with them for years and spent more of my and corporate money than I probably should have with them. In many cases they are the only ones still sitting on product, even if slightly older gear from Motorola and other manufacturers.

I also recently used them to prove a point to my current employer: pay full price direct to Motorola and wait six months to receive the item, buy from a local Motorola reseller for a little less and wait a few months, or go to Sunny Comm and buy current stock at one third the price as "new old stock" in their current stock, receiving the item a week later.

[wayoverthere]

2 hours ago, PACNWComms said:

+1 on this. Sunny Communications a.k.a. Used-Radios.com is a great company to deal with, and will get you what you need. Have dealt with them for years and spent more of my and corporate money than I probably should have with them. In many cases they are the only ones still sitting on product, even if slightly older gear from Motorola and other manufacturers.

 

Had nothing but good experiences with them as well. I think 3 of my collection are from them...2 handhelds and a mobile.

[AlexisGMRS]

I always recommend Haloid Solutions in NY for top quality Motorola equipment and beyond excellent service and integrity.

[WRXL702]

On 2/26/2022 at 8:44 AM, Ronster said:

I would appreciate any insight concerning the MTR2000 duplexer. After considering the EMR 653160 MC, it seems there is confusion as to the frequencies it can handle. At any rate, I know so very little about duplexers and this unit appears to be a 250 wattage rating, which is an overkill but the price is $525. This is in my price range I projected for this repeater build. As I have stated in an earlier post, I will be using CDM750’s at 25 watts. I am more concerned with trying to get good duplexer rather than a cheap duplexer without breaking the bank.

Comments appreciated!

Ron, WRPJ594, K0AAJ 

 

The Celewave 0185417U05 Is A Good Quality Duplexer, & The Price Is Reasonable. They Can Go For As High As $1150 To $1250, But I Would Pay $500 To $600 For A Good 4 Cavity Used Duplexer With Similar Specs. 

The 250 Watt Rating Is Less Relevant For GMRS Use, But More Important Is The Isolation & Insertion Loss Specs Of The Duplexer. If You Want A Commercial Grade, Good Quality Duplexer, This Is A Great Choice.

It Will Need To Be Tuned By Someone With A Service Monitor, As It Or Any Duplexer Is Specifically Tuned For A Single Pair Of Repeater Frequencies.

A Duplexer Is One Of The Main Components Of Your Station - Don't Skimp Just For $$ If You Can Afford It.

[nokones]

There is nothing wrong with any quality mobile 6-pack duplexer, such as the Celwave and EMR Corp. unit, if you are not using a cheap POS Pandaland duplexer. It all depends on how much power you are inserting into it and what type of RF environment the Duplexer has to live in for a mobile 6-pack to perform well. If the RF environment is a quiet environment, you will be very surprised on its performance and if it is in a RF Hell environment, such as a remote radio mountain top site, then that will be a problem and most likely will not work very well. 

If you're using a cheap POS Pandaland duplexer you have to replace the plastic inserts that are in the cavity ports practically every time you key the transmitter because they get burned out from the RF power.