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The RF SIDE - par deux The Repeater saga.

repeater Low Pass Filter

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#1 wqzw301



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Posted 10 January 2020 - 04:49 PM

So this is what I got, on the rf side of things...


Motorola Radius M1225 UHF 20-40watt

ID o Matic controller

RG-214 jumpers with N (non magnetic - nickel free) connectors

LNA from Downeast Microwave GaAs Phempt >17db gain 0.5db noise figure.

Harmonic Preselector 3 pole - 1.2 db loss - pulled from a Motorola MTR2000 brick

Vertex 6 cavity XUFIP0001 notch duplxer . 40watts in 37watts out on my meter.

50ft of DX Engineering 400max to a slim jim 3/8" copper - mounted on a 40ft fiberglass mast - away from all things metal...


My question

Should I add a Low Pass Filter? I kinda want to....

I've used them before on vhf transceiver's and have had great success in the cell tower jungle of Brooklyn....

BUT...Is there a point where more becomes less.....in line to the receiver

My neighborhood did just get new 800mhz cell towers in the area. About 1/4 mile away....

I have a LPF pulled from a GE Harrison repeater (432 - 470mhz). Can't find specs for it. Don't know the db loss...

I am looking forward to experimenting.....but due to my situation, I can not run around with an ht right now...

Plus I have learned on my own and would like to hear from people who actually know what they are doing and can add to my knowledge...



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