Hello fellow feeders and listeners,
Attached is an audio file which shows the effectiveness of using a filter such as the HPN-30118 to reduce interference from FM broadcasters which can cause a loss of sensitivity in most scanners.http://www.scannermaster.com/HPN_30118_Combined_Notch_Filter_p/24-531024.htm
I will leave the squelch open on my Uniden BC785D for this demonstration.
We hear Qantas 73 "heavy" checking in with San Francisco tower (120.500 MHz) for a landing clearance.
The white noise you hear immediately following is where the tower is giving the landing clearance. You can hear the Qantas acknowledging the landing clearance for 28 Right. Notice we didn't even hear the tower at all? Just noise.
I inserted a sequence of DTMF tones to mark the audio recording for "without filter" and "with filter".
It's like night and day. You can now hear the tower transmissions including aircraft on the ground with the filter in place.
Hope this audio example can be useful?
Thanks for putting up the audio comparison on the HPN-30118 notch filter. I live in Las Vegas about 6 miles from McCarran, 10 miles from North Las Vegas and 10 miles from Henderson Executive airport. I'm using a Uniden Bct15x and when trying to listen to the air band I noticed a number of radio stations mixing in with the transmissions from the Tower at KLAS at times making it almost unreadable. With KVGT and KHND I was unable to hear any traffic from the tower or ground.
That is until I purchased the HPN-30118 from ScannerMaster! Unbelievable is all I can say. I am now able to hear tower, and ground traffic from KLAS and KHND at almost full quieting. KVGT has improved significantly as well.
Also, the service from ScannerMaster was excellent. I placed the order late in the day on a Sunday and received the unit via priority mail on Wednesday morning.
Thanks again for the recommendation!