The solder joint had broken loose from the positive post on the bnc jack....Antenna works but not on frequencies below 230 MHz....I'm still in the dark as to the compatibility of this antenna with this old low frequency unit....oicu812
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no best to replace the antenna, they are not expensive. radio shack carried replacements once not sure about now, but other companies carry better antennas than the one that came with your scanner. Diamond, Comet, Smiley, and others.
This could be happening for a variety of reasons. The potentiometers could be dirty, and need spraying with electrical contact cleaner. The antenna connection inside the unit could be compromised, or there could be a cracked solder trace or power supply, or modulation problem. You can try to take it apart and see what you can see, but it will have to be troubleshot to be fixed, if cleaning the switches and potentiometers doesn't help.
If you're talking about a digital trunked system with multiple towers or a simulcast system, then 'welcome to the club'. I have the same problem, but that only applies to digital trunked multisite P25 9600 baud systems. Everything else should be clear. What band are you trying to listen to: VHF Lo, VHF Hi, UHF, 800MHz, analog or digital? RS's more expensive antenna will give you better reception on VHF over the 'stock' rubber antenna that they give you. Let me know what you're trying to hear, and I can help more on this issue. Okay?
I fixed the same problem with my BC 175xl. Open up the scanner and look on the radio receiving board, thats the board with the antenna jack on it. Check all of the diodes (diodes are very small red things with a black band on one end and short bare sliver colored leads coming out of both ends conecting it to the board) On my BC 175xl one of the leads on a diode in the lower right hand side of the receiver board had burned off. Reconect or replace any diodes that are either no longer conected to their leads or their leads no longer conected to the board. I discovered this repair on my own, after never finding anything about this on the internet