My base station installation of Uniden handheld scanners has an ongoing issue and I can't figure it out.
Here is the CURRENT situation: I have a Diamond V2000A antenna mounted on a eight-foot mast on the roof a two story office building. The scanner is fed with about 100' of LMR 400. Consistently, and within about 30 days of attaching either a 396T or 396XT (it's happened with different units of both models) the scanner will lose almost all usable RX.
When sent into Uniden for repair, they'll replace some diodes/resisters and return the scanner with a note advising to keep the scanner away from transmitters.
The problem is that there are are no known VHF/UHF transmitters close by except for a 50-75" railroad comm tower about 12 blocks away. Currently, there are no transmitters the building other than the usual personal communications devices (cell phones and tablets).
In a PAST RF configuration in my building, a yagi antenna fed by a 900 MHz Max Trac base station was moved to be co-located below the V2000A. The two coax feeds (to the scanner and to the Max Trac) were partially co-located.
Thinking that RF from the Max Trac was getting into to the scanners, I purchased a custom Stridsberg notch filter centered at the base station's TX frequency and installed that between the scanner and coax.
The filter made no difference and the attached scanner went deaf..
The company I work has since ended use of the Max Trac and I removed the base station and its antenna, resulting in the current configuration.
I made the assumption that decommissioning the Max Trac would solve my problems. Nope.
The only other possibility I can come up with is that my antenna is across the street form a series of auto dealerships have occasional radio station "live remote" broadcasts. Could it be the FM stations' remote link equipment?
At this point, I'm tired of sending scanners out for repair and would welcome any assistance.
Here is the CURRENT situation: I have a Diamond V2000A antenna mounted on a eight-foot mast on the roof a two story office building. The scanner is fed with about 100' of LMR 400. Consistently, and within about 30 days of attaching either a 396T or 396XT (it's happened with different units of both models) the scanner will lose almost all usable RX.
When sent into Uniden for repair, they'll replace some diodes/resisters and return the scanner with a note advising to keep the scanner away from transmitters.
The problem is that there are are no known VHF/UHF transmitters close by except for a 50-75" railroad comm tower about 12 blocks away. Currently, there are no transmitters the building other than the usual personal communications devices (cell phones and tablets).
In a PAST RF configuration in my building, a yagi antenna fed by a 900 MHz Max Trac base station was moved to be co-located below the V2000A. The two coax feeds (to the scanner and to the Max Trac) were partially co-located.
Thinking that RF from the Max Trac was getting into to the scanners, I purchased a custom Stridsberg notch filter centered at the base station's TX frequency and installed that between the scanner and coax.
The filter made no difference and the attached scanner went deaf..
The company I work has since ended use of the Max Trac and I removed the base station and its antenna, resulting in the current configuration.
I made the assumption that decommissioning the Max Trac would solve my problems. Nope.
The only other possibility I can come up with is that my antenna is across the street form a series of auto dealerships have occasional radio station "live remote" broadcasts. Could it be the FM stations' remote link equipment?
At this point, I'm tired of sending scanners out for repair and would welcome any assistance.