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Remember when the FCC OET actually gave a damn about incidental radiators? In its most common form, radio is used for the transmission of sounds (voice and music) and pictures (television). Coaxial cable represents one way to do this. Unfortunately, AM stations on adjacent channels and using 9.5 kHz NRSC-1 produce more mutual interference than when using no pre-emphasis, even in narrow-band AM receivers: http://postimg.org/image/4kfe5lmg9/, There are many areas of the US where stations on adjacent frequencies have overlapping useful groundwave contours, where this added interference would be present. AM/FM Radio Receiver • Example: Incoming carrier frequency 1000 kHz, • Local oscillator = 1000+455=1455 kHz • Consider another carrier at 1910 kHz • If this is passed through the same oscillator, will have a 1910-1455=455 kHz component • Therefore, both carriers will be passed Either no HF response – sounds like the receiver has a 2.5kHz LPF in the audio or else I get really horrid HF distortion (screachyness) sound on music with lots of natural density: ie. This is is coupled back to the output of the amplifier. I get the gist of what you’re describing, but I’m a visual learner so I’d love to see the circuit, component value ranges, etc… described in such a way that they could be sketched out on paper. This likely didn’t help the surviving AMs sticking with a music-based format. Bad reception. Until that’s fixed, anything else on the AM band is just shoveling sand against the tide. Even if they clamped down hard on it today, it would take at least a decade to see the results. After putting in a wider ceramic filter in the AM side (it is WIDE, like 50 khz), I have been surprised to hear how good AM can sound. We tried several other vehicles on the lot with AM/FM receivers-same effect. questioned. In addition, it can receive AM, SW, LW and SSB radio waves. Have a poineer vsx-2014i amp the volume control does not work and we have no remote any ideas on how to fix this. If it can’t maintain a stable lock, it’ll produce very unstable shifting audio, often with the occasional heterodyne sound popping in as well. This site is filled with rec. I’ve got a few old AM sets I’d love to add such a circuit to (you know, before analog AM gets two to the head). AM audio (it has both Medium Wave and Long Wave) was so muffled as to make it very unpleasant to listen to, especially in the presence of other sounds such as when working in a kitchen. The transmitter is flat from 20 Hz to 10kHz and the antenna system is designed and adjusted for DRM so phase rotation is perfect with perfect AM symmetry. Square waves are Square. If the signal strength of stations are too weak, use direct tuning instead of automatic tuning. "Why Your Dad’s 30-Year-Old Stereo System Sounds Better than Your new One" Yea I don't think so. The solution was simple; narrow the bandwidth until the “monkey chatter” disappeared. Since the audio out of the discriminator is fixed for signals that saturate the limiters, the audio gain in an FM receiver has very little effect on receiver sensitivity. low and behold, audio quality went from 10kHz to 3kHz. (C33 is a 0.022uF Ceramic cylindrical capacitor with colour codes that looks like a resistor) I had found the service manual available to download at http://elektrotanya.com/sony_pmc-205l.pdf/download.html Basically, the diversity system has two receivers listening to the same signal from different vantage points. http://www.bobsamerica.com/swl.html. Both transmit the information in the form of electromagnetic waves. Make sure that your device has an antenna connected to it. The BW changes because the AGC changes the gain of the IF strip while the amount of feedback is constant. Most AM radio stations are required by the FCC's rules to reduce their power or cease operating at night in order to avoid interference to other AM stations. Overall the audio experience is great, given a relatively small tabletop radio size. AM works by modulating (varying) the amplitude of the signal or carrier transmitted according to the information being sent, while the frequency remains constant. Manuals are posted on your model support page. I have changed the program feed now. If you have my luck with radio reception, the signal probably breaks up again right as Neil Young tears into the solo on “Like a Hurricane” or Ira Glass gets to the point. Stretch the radio power cord as straight as possible to try finding better radio signals. If approved, a temporary shopping pass that could be up to $1500 in available credit may be issued and sent to your smartphone, allowing you to shop online right away. And sometimes TV, Private Microwave, Wireless Internet, or whatever pays the bills. The CC Radio 2-E does not. ANTENNA. Sound waves are mechanical vibrations of air particles (which is why sound travels so much slower than light, at a speed of 767 mph), but radio waves are electromagnetic energyand a part of the same spectrum as light. Note that on fading signals such as on MW and HF bands, the BW of the receiver seamlessly and continuously changes with the signal strength. Coax has two key properties: 1. You may have even noticed your car radio sometimes switch to mono. As usual Paul you are right on. In essence it was digital broadcasting but on the receiver side. A quick scan with a quality AM receiver shows that many stations are transmitting high quality audio, which, with a properly adjusted IF bandwidth can sound remarkably good: This is a screen shot from a SDR (Software Defined Radio) showing WEOK, Poughkeepsie, NY broadcasting the True Oldies Channel. The audio processors do a good job limiting to that bandwidth, but when the IBOC exciter also does it, you’ve got an even worse-sounding signal. I live in an area where there are only a few AM stations, spaced far apart. Check the radio reception after you complete each procedure. It had become a vicious circle with manufacturers narrowing receiver bandwidth, then stations boosting HF to compensate. ... pulsing sound. Ihave boosted the LF by 9dB at 90Hz. AM transmissions are much more susceptible than FM or digital signals are to interference, and often have lower audio fidelity. Care to specify what your circuit is? But there is enough room to give AM stations clarity equivalent to … That's an industry designation for the higher quality AM radios. In addition to the good comments regarding receivers above I would make the following comments regarding the design of radios with digital tuning: (1) that digitally-tuned radios have an option to allow manual fine tuning in 1kHz steps on AM. At any given time, electronics chooses the audio from the receiver producing the strongest signal. It has a 12 watt Class D amplifier, a 3″ woofer, and a basic 1″ tweeter that delivers a clear sound. Founder and Principle Engineer Learning how to improve AM radio reception in your car is one of the best ways to ensure a smooth ride in the vehicle. I bought an Infiniti sedan. Truth be told, there are many available on eBay and other places. The owner of our station was “thrifty” in that he would buy sapphire styli for the GE VRII turntable cartridges. This planned destruction ofthe AM band is a long time in coming. –But I doubt receiver makers are listening. No complaints about its FM performance on the other hand, good sensitivity and not prone to overload from nearby FM transmitter(s) either. Todays mostly talk radio AM band has much quieter monkeys! low and behold, audio quality went from 10kHz to 3kHz. At the time, GM still made car radios in a nearby city and they had two schools of thought for AM stereo — the “high-fidelity” crowd and the “narrow bandwidth/low cost” bunch. I remember when we were forced to put in the NRSC filters there were immediate complaints from the on air staff. AM reception guide. What a coincidence!” A newer version of your browser may be available. But every time you add a station, something somewhere has … Sony STRDH190 has a built-in AM/FM tuner. AM Reception Tips – Part 1 – Radio Noise Problems and Static Troubleshooting AM reception is a very common theme here at C. Crane. Your SDR is very interesting. In these cases, use an optional antenna that provides a larger reception range. Audio inputs on an A/V receiver let you connect the audio outputs of DVD players, CD players, game consoles, HDTV tuners, Media Center PCs, digital audio players for MP3 and other computer audio, and many newer digital cable set-top boxes or DSS satellite receivers. modes and home brew radio stuff Radio antenna is the only element that actually receives radio waves. What a coincidence! Even once we’d gone to Motoral AM stereo, on a good radio (there were a very few — I believe sSony had a nice one), it held up well against FM. When everything is connected properly on my pioneer elite receiver their is no sound from the speakers. All your radio stations have to fit inside that 1Mbps budget. AM radio that sounds as good as FM Stereo AM radio uses smaller sections of bandwidth than FM. Surround sound receivers can also be used to play back stereo audio, but audiophiles find fault with the sound quality of the music using surround sound receivers. I took it back to the dealer twice because the AM section just didn’t sound right. This means the signal is actually worse in stereo. The problem is that the majority of AM receivers in use today make use of the superheterodyne circuit principle (conversion to an intermediate frequency (IF) prior to detection), something that unfortunately results in very severe sideband cutting, with the result being audio bandwidth and quality comparable to an ordinary telephone channel. A local 5 kW AM station could sound almost as good at as a local 50 kW FM. Poineer vsx-2014i amp the volume control does not take a rocket scientist to see that 3 KHz audio is listenable! 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