Commercial, Professional Radio and Personal Radio, Introduction to Communications Systems - YouTube. FRS radios are designed to work with channelized frequencies spaced between 462 and 467 megahertz. GMRS vs MURS. Equal? They also don’t require any license to use as long as you’re working with approved equipment. 2nd is for 10-meter antenna heights at both ends. Brownsville Texas,On The Border By The Sea. as a general rule, all things being equal... the lower the frequency the farther it travels. A part of it covers this topic. You’re more than likely going to find that most compact UHF walkie talkies are designed to work with either General Mobile Radio Service (GMRS) or Family Radio Service (FRS) frequencies. you hear his low frequency bass because it carrys farther. Filling in these shadow regions is really all you get with more power. I think it truly depends on terrain. Since communicating on FRS frequencies doesn’t require any paperwork, you might look at it as a better option for any situation where you don’t know who you’ll have to hand a radio out to. Higher power outputs and the ability to attach a more practical antenna makes these frequencies useful for up to several miles. If you’ve ever used a CB radio or a baby monitor, then you might associate two-way communication with a substantial amount of static. Private line (PL) codes are available on most modern radios, and these help to reduce noise even further. Even though this kind of equipment costs more than standard two-way radios do, many people find that the fit and finish on it tends to be a little higher. One factor I encounted often was when users would not hold their radios upright, but hold them like a cellphone nearly horizontal to the sides of their head, or horizontally like they were looking into a compass. As far as I know, my GMRS portables were only 2W. The major problem with MURs is the interference from much more powerful licensed users that can easily wipe out your communications. More? You should expect better performance from MURS, as most of the stuff out there is commercial grade. Making sure everyone in the group actually held the radio vertically helped a lot. If you want to communicate over the maximum range possible, then you’ll want to look into using GMRS channels instead. Bad cross/random polarization. GMRS base models can usually be expected to work even if they haven’t been powered on for some time. The first 3 channels are more narrow band than what the standard Narrow band is on nearly all HT's (11.25 KHz vs the standard 12.5 KHz). I thought about this, and the explanation is that the stock antennas are just not as good at 150 Mhz as at 146. From a technician’s standpoint, GMRS frequencies are nearly identical to those used by FRS two-way radios. I once read that pine needles are typically a quarter wavelength long at UHF frequencies. You’ll only hear their transmissions after that. Yes, there are some propogation through foliage and reflected signal efficiency differences for different signal wavelengths, but once the receiver goes over the horizon (or behind a hill), it is going to lose reception.

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