Steve, It's on 2M, single Station Master antenna with about 400 feet of 7/8" feedline. The duplexer is a BP/BR followed by a band pass can, then the pre, then the radio side. All cables are RG-400.
The radio is GE Exec II. The sensitivity without the pre is about 0.35 uV. The noise floor is pretty low, but the ARR pre was picking up a bunch of garbage without the attenuator. Dwayne Kincaid WD8OYG > > I have added a preamp (ARR GasFet) in front of older GE Pro receivers on UHF > and really made an improvement. I am guessing you are using a single > antenna and a duplexer and the preamp is between the duplexer and receiver? > > Are you using a band pass / band reject duplexer? Some notch duplexers on > 440 let signals either side of the notch pass through freely. You might > change the coupling on the loops in the receive side of the duplexer to > increase loss (attenuation) and get steeper skirts. Tell me a little about > the system, antenna, feedline, duplexer, jumpers, the repeater itself? > > Thanks, Steve NU5D > > On 3/21/07, ldgelectronics <[EMAIL PROTECTED]> wrote: > > > > Hi all, > > > > We've added a preamp to our local repeater and found that it had too > > much gain. It started picking up lots of garbage. Reducing the gain > > by about 6db seems to put it in a good operating place. > > > > Ham Radio Spoken Here.....NU5D > Visit the Temple Ham Club Website > http://www.tarc.org > www.yahoogroups.com/group/Temple_arc > www.yahoogroups.com/group/60meter >
