What is a good Base station antenna for GMRS
2020年3月3日 · In that case, a high gain antenna won't do you a whole lot of good. Gain is achieved by directing power out towards the horizon. With the hills/mountains around us, you want something with a bit more of a round pattern. I ran a low gain UHF antenna in Watsonville on GMRS for many years. Was just fine for reaching everything I could see.
EIRP and antenna gain - Cisco Learning Network
An antenna gain of 3dBi means that it gives a gain of 3dB compared to an isotropic radiator. No such radiator exists, but the sun is the closest you can think of. (Physics geeks be aware that I know the sun actually radiates from it's surface, where an isotropic radiator radiates from a point in space time, but I am trying to help here, so lets ...
What NMO antenna has the best SWR for GMRS on a mobile …
2023年9月3日 · A higher gain antenna will give you higher ERP. But, higher gain antennas come with a trade off. High gain is achieved by focusing the RF energy in a specific pattern. That pattern is important and it needs to be a pattern that does what you want. Higher gain is not always better. Don't fall for the rookie mistake of focusing too much on RF ...
Antenna gain and cable loss | RadioReference.com Forums
2022年1月16日 · Well, as stated above, the discone antenna has zero dBd of gain, which is equivalent to a dipole. You are loosing some of the received signal in the coax, and that's normal. LMR-400 is pretty good for this sort of application. If you want better 700/800MHz reception, you might want to consider a dedicated 700/800MHz antenna, which will have ...
Transmit Power vs Antenna gain - Cisco Learning Network
This is beyond the scope of a CCNA Wireless exam, but I'm curious, anyway, as part of my EHCEP. Neglecting cable loss for the sake of this discussion, total power out is a function of transmit power and antenna gain. The FCC's rule for P2P transmissions allows the nominal max EIRP of 36dBm (in the 2.4 GHz regime, anyway) to be exceeded through the mec
1/4 wave, 1/2 wave, 5/8 wave, full wave? - RadioReference.com …
2007年1月14日 · On HF where hams string up horizontal antennas, the lobes on full wavelength and larger antennas (and OCFDs) can be put to good use with gain in some directions depending on antenna height. Keep in mind that antennas are reciprocal from transmit to receive and whatever is bad for transmit is the same and/or bad for receive.
What is the best 2 meter antenna? | RadioReference.com Forums
2016年5月11日 · You can't just have dB any more Antenna gain measured against a dipole is shown as dBd (the d being for dipole). This was the 'normal' way of doing it in the 'old days' so the d was usually left off. Measuring the isotropic gain of antennas has become popular. This is shown as dBi (The i being for isotropic).
Antenna Gain Question - RadioReference.com Forums
2019年10月22日 · Problem is there is dB gain compared to a dipole (dBd), gain compared to an isotropic source which is a theoretical modeled thing that has 2.14dB less gain than a dipole. Then there are pure fantasy gain numbers made up by some antenna companies simply to sell antennas. In other words, their gain numbers are lies.
RX antenna Gain - RadioReference.com Forums
2014年4月21日 · Antenna makers like giving you gain in 'dbi' because it makes their antenna's sound better than they really are in the real world. Like stated earlier, subtract 2.15 from gain given in dbi to get a 'real world' gain factor over a dipole, dbd.
Antenna Gain Vs. Distance???? - RadioReference.com Forums
2007年12月4日 · Maybe a stupid question (no such thing as stupid questions just stupid people) is it possible to equate antenna gain with distance a signal can be received. For instance I want to build a 4 element J-Beam antenna and I should get about 6 dBd gain. I have a signal (wireless mike) that I can pick up about 1/2 mile away.