Hi Jim, I am using a Wavetek 3001. I also have a MVP here with the same helical filter and it doesn't exhibit this. Hence fairly convinced that something is going on with the Exec's filter. It seems like the signal is getting better because were loosing the loss of the filter stage. Update now is that I have resoldered the base of the first coil and ant connections and it has got a lot better. I don't see the change near as much, but moving the cable around still does impact the signal.. The RX freq is 448.625 and sensitivity seems to be .72uV for 20db of quieting versus spec of .5uV. So still fighting it.
Randy --- In [email protected], Jim Brown <w5...@...> wrote: > > What are you using for a signal generator? Some generators leak a lot of > signal and might have more than .35 uV of signal radiated on the outside of > the coax. When you break the shield path, this higher signal level might get > to the radio. > > Another post mentioned that the RCA connector uses a short pin. I use a BNC > to RCA connector with the center pin cut back to match the radio internal > connectors to avoid problems in this area. > > 734 - Jim W5ZIT > > --- On Thu, 5/28/09, wb8art <wb8...@...> wrote: > > From: wb8art <wb8...@...> > Subject: [Repeater-Builder] Exec II input problem > To: [email protected] > Date: Thursday, May 28, 2009, 4:02 PM > > > > > > > > > > > > > > > > > > Wonder if anyone has had this problem and know what the problem > is. I am working on a GE Exec II repeater (converted mobile) which has no > Comb no. I any case the issue is that if I move around the cable feeding it > with a generator I was seeing a change in the recieve. > > I went directly to the RCA jack, and then found that just making > connection with the center pin, I have about 10 to 20db stronger recieved > signal than when I push it all the way in making the ground connection. > > This is a mobile and the RF deck is no. is 19D417075G14 rev A covered by > LBI30032E. This shows a option of either non floating ground or floating > ground input. This one is a non floating ground one. Might have been > changed but I have know knowledge of its history. > > The RCA jack center pin connects directly with a wire thru a hole to the > first helical and I have looked and can see no connection issues and measures > a short with an ohm meter. I even reheated the solder joints and no change. > Anythoughts would be appreciated. > > > > Randy >
