- Aug 18, 2007
- Hope Valley, RI
I have three BCD996P2 scanners, one at home and two in vehicles. The one at home recently replaced an older BCD785D and BC780 for my online audio feed through Broadcastify. I noticed that the UHF reception on the new 996P2 is much worse than the older scanners using the same Diamond Discone antenna. All UHF channels I'm trying to receive are analog conventional. Keep in mind that I am a two way radio tech with 34 years experience and have access to test equipment. So I did some testing today using the signal generator in my communications service monitor and an iso-tee. I comparedthe two 996P2's, the BCD785D, and the BC780. When the signal generator is directly connected to the BNC jack on each scanner the UHF receive sensitivity is approximately the same, around -120 dBm (0.2 microvolts) which is perfectly normal. Then I inserted the iso-tee between the scanner BNC and the antenna cable, and generated the signal into the decoupled port of the iso-tee. This is basically an Effective Receive Sensitivity measurement (ERS) which takes into account not only the receiver sensitivity but it also introduces the outside influences of all RF energy in the air around my location and tests the receiver filtering. The difference was astounding ! The BC785D provided the best performance with -76 dBm required to open the squelch, the BC780 provided good performance at -70 dBm, but both of my 996P2's were very disappointing, requiring a massive -50dBm signal to open the squelch. That's 26 dB worse than the BC785D !. THAT IS A HUGE DIFFERENCE ! Its no wonder THE 996P2 can barely receiving a UHF fire depart repeater about 15 miles away which comes in good on the old scanners. I then tested all of them on a 154 MHz VHF frequency. The 996P2 and the 785D were both good at around -70dBm. The old BC780 was very poor at -50dBm. Has anyone else noticed poor UHF receive on the 996P2 ? Keep in mind that I live in a rural environment. The nearest cell tower is about 0.6 miles away, and theres a 500 foot tower about 3.3 miles away with a UHF TV transmitter on it. The 996P2 may be overloaded by the TV signal while the older scanners didnt. I may have to try this test at another location. I'd love to get some feedback from others , especially from Uniden tech support engineers.