Next time you are at the site plug 150.66666 into a handheld and see if you hear it. That number is the result of 904 / 6 and it the transmitter is leaky enough you just might be able to t-hunt it.
Or make up a 900mhz beam and plug it into a handheld scanner that you wrap in foil that is grounded to the antenna BNC shroud. Poke some holes in the speaker grille so you can hear it and off you go... Mike WA6ILq At 06:03 PM 07/19/08, you wrote: >The only fly in the ointment is moving the >RX. We donât know WHERE this noise is coming >from... so if he moves, he may move CLOSER to >rather than further away from the source... > >I think a 904 notch on the RX may be a workable solution. > >Thanks, Ron. > >Mark - N9WYS > >-----Original Message----- >From: [email protected] On Behalf Of Ron Wright > >Mark, > >At say 140 MHz 1.4 MHz is a long way, but at 900 >it is 1/6th the distance. RF works in >percentages. So the wide TX is really very close to your receive. > >The TX being 100 kHz wide might mean it is >digital and this can be very wide with lots of >signal MHz, but down 80 db, from its center >freq. However, still this low level being so close could cause you problems. > >If a problem of overload then a cavity on your >receiver would help and might solve your >problem. It would give you protection from the >stron 904 tx power. Also a cavity with a notch >at the 904 TX freq might help doing the same. > >However, if this is from the 904 wideband noise >then this means its wide band noise is on your >receiver frequency. The solution is a notch >cavity on the 904 TX itself which you might not >have the previdledge of doing. They might not >let you touch their equipment. In this case the >solution would be distance and seperation you >from him. Also moving the rcv freq as far as you can might solve this problem. > >Too bad you could not turn off the 904 tx for >short period of time to see if this is the >problem, but since very close in freq I would >suspect it. However, they may be perfectly >legal, just physics of radio. I've known of >users at a site go around and just start >unplugging others systems to see if they caused >a problem. Some of these people are not longer allowed on the site. > >73, ron, n9ee/r > > >------------------------------------ > > > >Yahoo! Groups Links > > >
