Just take the one off the MTR, it will work without issue. Have it checked on a service monitor.
I did and had it checked something seems weird though. 2 service monitors showed the same thing. 3-5db attenuation on the receive and 47-51 on the transmit freq. However, if you tap the preselector or it sitting there with the TG on it'll occasionally do some funky stuff where the receive attenuation will randomly jump to -15 to -17 and tx to -20 to -27. I should have mentioned this in the original post. But that's why i'm uncertain if it's really needed since we are using Q2330E duplexer with -90 to -100 on both tx and receive isolation and less than 1 db on the receive pass. And if so just buy one from fleabay and have it tuned from a MTR?
Okay, I'm confused, are you using a TPRD-1546C or a Q2330E? Your OP you say your using a TPRD-1546C, yet in this post you say your using a Q2330E
What do you mean on transmit? The preselector should be between the duplexer receive port and the receive input of the repeater. And your -15 to -17 what? Need units and need to know what and where you are making these measurements.
The MTR had the TPRD-1546C connected into the Q2330E. The GTR did not come with a pre-selector. Hence the question do I need the pre-selector or can I run the Q2330E alone and if not then what is the recommendation?
185W is that the system was setup with years ago by a radio shop which is no more. Switching to a P25 repeater now with everyone else in our area. Running 7/8 AVA5-50 the feed line to the tower to cabinet is around 360ft into a polyphaser at the cabinet and at the antenna its 8ft off the tower with jumper. the feedline doesn't do and bend till the icebridge on the ground and sweeps clean from polyphaser to antenna. 5w portables and mobiles at 50w you are correct. The biggest problem we are trying to overcome is the 99sq mi area in wv mountains with only one site and the tower is 15mi away from our busiest area. The tower can receive 14 to 15mi away on portable. But cannot tx that far to a portable, but mobiles hear it fine and about 20mi away it starts to degrade completely. A few years back we had some interference and a friend of mine which is now a retired Motorola ST came out and was able to determine there was a problem with the new LED tower lighting that was installed causing interference. But that since has been resolved. We were using the MTR then and put in a used Quantar for P25 testing and decided to switch with everyone else and purchased the GTR. But we have always had the problem of the tower hearing farther than it can transmit.
-15 to -17db to the receive frequency and the transmitter which is blocking would jump from -47-51db clear up to -27db just sitting there. But that came from 2 service monitors different manufacturers all calibrated and normalized.. I'm thinking there is something up with the pre-selector. But the best that could be achieved was -3 to -5db on the pass and around -47 to -51 on the tx freq the reject. and yes the antenna is in a omni pattern. There is lightning protection and the polyphaser and I believe ground straps at every 50 or 75ft, I'd have to go count them, I know there are plenty there. That tower is prone to strikes.
Oh yeah.. That's an entire sinclair kit. When we moved there we had sinclair do some engineering and prop studies and the antenna is made to cover the maximum amount of area with consideration to terrain. I know what model it is as mentioned above. But I know some RF things have been changed. I cannot remember what, but I remember talking to the engineer and this was his recommendation for our site and area. I know there has been some changes from stock or what is seen on their page. And our board bought 2, 1 as a spare just in case.
