noise

I need some advice on selecting a ferrite to filter out noise spikes from a switching power supply that is being fed into a radio. I am an electronics hobbyist with spotty knowledge, mostly from the late 70’s to early 80’s (TTL, CMOS, op-amps), but unfortunately minimal RF. If this is not the...

Hi all, I have a problem with my FT5DE when I use it in Digital Mode, while transmitting there is a fastidious background noise under my voice. The problem is not present on my old FT1XDE radio. I attached an audio recording of the comparison of FT5DE vs FT1XDE. In our Radio Club we have got 5...

Hello, I'm new to radio maintenance. I have a Motorola XPR 7550e that when it turns out, it flashes "out of range" and has a none stop steady almost like two radios stepping on each other. I also can't change the channels, zones, etc. I tried swapping out the antennas with no luck. I wanted to...

I was wondering if someone could explain the specific differences betwen ANL and NB? I've read several places that NB will block the sharp spikes of noise, but i've also seen the same said about ANL. So what specifically does each do? and what side to they operate on: the power or antenna or...

I recently put a 29 LX in my truck as well as a mag mount Wilson 1000. With the truck not running, there is hardly any static even with the RF gain cranked up. But with the truck running, the only thing I hear is a popping or cracking sound that's relative to engine rpm. I disconnected the...

Being new, I am not sure what I am hearing on this conventional system. I attached a zip with mp3. Alternately I added the file to dropbox Dropbox - Gila-NAT7-Payson.mp3 - Simplify your life I never used to hear this until I moved my antenna to a higher location. The audio type is set to "all"...

I have attached 3 images of my RFI problem Image 1: Shows the RFI morphing into the alternating signal. This happens every 2.5 min and starts from a constant signal to a stronger signal for 5 sec then into the alternating signal for 5 sec. Image 2: shows spacing of RFI Image 3: What my...

Wondering if anyone has seen the new RTL-SDR Blog Wideband LNA product yet? Seems to have been announced on sept 4th. https://www.rtl-sdr.com/tag/low-noise-amplifier/ Specs show: Frequency range of 50 MHz to 4000 MHz Noise figure = 0.6dB @ 900 MHz OIP3 = 39.5 dBm @ 900 MHz P1...

Hey Friends...I hope you can help. I'm just curious more than anything, and learning a lot about my new scanner. It's a Uniden Bearcat BCD996P2, and every now and then I get several paging tones....usually displaying IDPS Paging. I've been locking them out when then happen, but should I be...

I understand the APX7000XE has rather good background noise suppression technology. I recently bought an APX7000XE and would like to enable the noise suppression on my digital channels. I watched this video (https://www.youtube.com/watch?v=bUxAw55O1rg) on youtube and was fairly impressed. I...

Hi all you good guys, I have 5 MTS2000 VHF radios. Before I tried to program them, they worked fine. The problem was that I did not have the license to operate them on those channels. So now I have programmed one frequency in. I have cloned all of them. Now when I turn them on I only hear...

I built a single wire 40Meter Beverage pointed towards the N.E., 1.3 wavelengths long and 10 feet high (above "antler height"), and it is far noisier than my full length 40M dipole that is up 50 feet. I just can't figure out why; I am using a DX Engineering matching transformer that is...

So I recently installed a new yaesu 2900 and larsen nmo150 antenna in my truck to monitor two meters and some utility frequencies. It seems to work good except on certain frequencies it picks up a lot of noise and on others it doesn't. This radio has a squelch knob which helps eliminate the...

I just programmed my PRO-652 and my PRO-96 scanners using the Butel Software with local frequencies. Almost immediately I began hearing what I will call control channel data noise (buzzing sound) and the scanning stops until I scan again - and then it occurs again within a few seconds. I am...

I'm a new scanner owner (BCD996XT) and have a question regarding issues I'm facing trying to pick up my local police signal. I've configured the scanner using FreeScan and RR import functions for my city/county. I'm able to successfully receive channels for the county sheriff and fire...

I have an Icom Scanner with an SJ-118 antenna. It is tuned to 119.75MHz (Monterrey Approach and Departure). If the squelch is open it receives the signal of a local FM radio station (107.7MHz). How do I go about filtering that so I can open the squelch a little more to get what I really what I...

I loaded up my BCD536 HP using zip code, and it is correctly scanning both the local trunked and conventional systems. There is an annoying squelch tail (1 sec long and LOUD) after analog trunked transmissions. I did not have this problem on the HP-1 or my BCD996/396 series. Is there a menu...

I am trying to setup a feed but cannot get the audio output on the BCD536HP to work properly. I have tested both audio outputs and have a very annoying whine that comes through the audio. I have posted two sound files that demonstrate the problem. Is there anyone that can post a schematic on...

So, I'm trying to calibrate my NooElec RTL-SDR RTL2832U & R820T for SDSharp, using the stock antenna, which actually gets pretty darned good reception. Problem is, upon calibrating my signal, so it sits center of the peak, I get this high pitch noise. If I readjust the signal so it sits a bit...

I was just wondering what methods people use to eliminate the ground loop/hum issue when your scanner is plugged into your PC? I am interested in becoming a stream provider, but cant get past this issue... Ive tried a ground loop isolator, but am now out of ideas... any helpful hints/tips???