Re: [Repeater-Builder] Re: GE Master Pro

4 Aug 2004 12:13:16 -0000

I use an ARR preamp on my 6 meter repeater and optimum performance is with a 3dB pad (if I remember the value correctly) on the INPUT of the preamp.  Now, this may seem crazy to some, but it works.  I learned this from Jay who owns ARR here in Connecticut.  I had stopped by the store to request that he build a lower gain preamp for my repeater and he suggested using various value pads on the input until I obtained optimum performance.  Thinking he was one of those crazy RF engineers with weird theory based ideas, I decided to try it.   I used my Telewave watt meter that has a sample port (you can also use a modified Tee connector) to inject a signal into the repeater antenna line.  I then  played with various pad values until I maximized the Sinad reading. (You can also do this by ear if you are careful).  I gained a noticeable amount of receive sensitivity with the 3dB pad.

I still don't have it quite straight in my head how this works, all I know is that it does work.

73, Joe, K1ike


At 04:39 AM 8/3/2004, you wrote:
I have a 2 meter repeater made from a GE Mastr Pro located at a hi level RF
site with TV, FM broadcast, & land mobile VERY near by and/or on the same
tower.  I use a 6 cavity pass/reject duplexer.  I notice definate improvement
WITH an (ARR) GaAsFET pre-amp AND a extra pass-cavity on the input.  (I hear
Angle Linear is also good - possibly better, someday I will try one)

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