# Tag Info

14

A homemade "rat-tail" ground plane costs 35 cents each to make. A crimp on eyelet to fit your antenna's connector, a string of speaker wire about 19-20 inches long and a little heat shrink tubing to dress it up and done. Soldering the the wire to the connector instead of crimping it will be a better option. Go here for some details about the "Rat-Tail" ...

13

There have been a number of good answers already, though I think there are a few additional points worth sharing. Answers would also be more relevant if we knew what situation(s) you were coming up short range wise. For portable use (out in the field): The stock Baofeng rubber duck antenna has been shown to be a poor performer. All of the stock rubber ...

10

In the United States, for the most part, all radio transmissions fall into one of three categories: The operator is allowed to transmit on that frequency (amateur, "business band", aviation, military, etc.) The radio is allowed to transmit on that frequency (CB, FRS, MURS). The transmissions are very low-power ("Part 15": WiFi, Bluetooth, lots of other ...

10

I just purchased a UV-5R to hopefully integrate into business class radios my company uses. Unfortunately, this is not likely legal. Business radio is licensed under the FCC's Part 90 rules; those rules include 47 CFR § 90.203 - Certification required: "[…] each transmitter utilized for operation under this part […] must be of a type which has been ...

9

Yes, the baofeng stock antenna is the worst antenna I have ever used. I have both. The range on my 5W BaoFeng UV-5R, with the stock antenna is about 3 KM with direct line of sight and no obstacles, and get terrible audio reports and am unable to hit a repeater accurately any more than 2 km away. With the NA-701, I get about 5 KM distance, with better audio ...

9

Many radio manufacturers are aware that people don't want to hear CTCSS tones - so they put high-pass filters on both the output (speaker) and input (microphone). That eliminates the tone before it gets to your ears, and will also prevent an errant tone near the microphone from triggering a repeater somewhere. Some of us might not agree that the tones are ...

8

The Baofeng UV-5R and any other variations in the UV-5R family of radios have an SMA male connector on the radio mating to an SMA female antenna or SMA female adapter. In the picture I'm holding the anntenna along with the radio so that you can see for yourself which sex connector is on the radio and which is on the antenna.

6

If you don't need mobility, purchase an inexpensive directional 4 element Yagi antenna for 2m and operate it in vertical polarization, that is with the prongs of the yagi pointing up and down. You can sometimes find these small Yagi antennas used for ~$20-30. But note this will only help you for 2m, and should not be used on 70cm. For 70cm you can get a ... 6 The plug used in the Baofeng base is a 5.5 mm/2.1 mm barrel connector. However, you cannot simply parallel a bunch of base charger units and power them off of a single AC or DC adapter without properly considering the total current required. The stock AC wall wart for the charger puts out 10 volts at 0.5 amps. Each charging base will require 0.5 amps. So, ... 5 No, the UV-5R will not accept a female connector. The threads on the outside are for the nut that mounts the connector to the case. 5 I use chirp (http://chirp.danplanet.com) to program it's memories. A simple USB-UART chip like this ..is all that I use to connect to the pc. With regards to pinouts, use: The above schematic shows connectivity for the UV-5R and the UV-3R. You can safely leave out the UV-3R stuff.. Courtesy of: http://www.uv3r.com/uv5r.html 5 1) listen to FM radio, while scanning 2 meters and 70cm bands at background (as in hiking)? nope (and only 1 band scanning at a time) 2) set scan hi and low limit, via keypad and/or pc software, so that scan within ham band only (instead full transceiver freq range)? nope, but you can limit the ranges using chirp 3) scan 2m and 70cm 'simultaneously'. ... 5 See This Chart at BaofengTech.com. Really the UV-5RE is just a cosmetic variant of the UV-5R. As to your firmware version you should check out this page at Baofengtech.com. Sadly it is not very helpful with your firmware version: BFB297, BFB298 Unknown Changes But it is still a great reference. 5 The exact answer is given by the Friis equation. If you double the power, your range will increase by 1.413 times whatever it was before doubling the power if you change nothing else. This assumes you do not violate line of sight rules and that there are no additional obstructions in the longer path. You could get this same effect by doubling the gain of ... 5 4W to 8W is a doubling of power, or a 3dB increase. That's 3dB you can add to your link budget. Provided of course that the limiting factor is the other station hearing you, not the other way around. Let's say with 4W you can be heard up to 10 miles away. In idealized conditions (no terrain in the way, no interference, etc) 8W increases your range to 14.1 ... 4 The main differences with these units is FIRMWARE! The firmware can be checked by powering off the unit and holding the "3" key down as you power it on. This number however does not always reflect the true firmware version and I recommend using CHIRP and a programming cable to find the firmware listed on your exact radio. For reference I recommend you ... 4 Battery University has some general information on storing batteries. Relevant points: Storing a Li-ion battery in a discharged state will permanently damage it Storing a Li-ion battery at 100% charge is less than optimal around 40% charge is optimal for storage Lower temperatures are better Freezing is bad Leaving the battery connected to the radio or the ... 4 How about the software made by Baofeng for the UV-5R? http://www.miklor.com/uv5r/UV5R-Software.php I have used it and works fine when you figure out how to put it into English mode. The instructions for that are on the link, in the middle of the page. 4 In theory, this is a question of the bandwidth - or better said of 2 bandwidths. In practice it's much more complex. But let's have a look at bandwidth theory first: the bandwidth of your transceiver the bandwidth of the signal interfering you. Let's assume you have your receiver on 151,180,000 Hz. Let's further assume your receiver has a bandwidth on FM ... 4 This is a harder question to answer than you think for a number of reasons. I'll start off with the ideal answer: The Diamond RH-771 claims that it has 2.15 dBi gain at 70cm (or 0 dBd). Most rubber ducks are significantly worse than quarter wave antennas, and often exhibit negative gain. A short antenna like the SRH-701 has no gain (or -2.15 dBd). The ... 3 No the UV-5R does have a programming cable but it does not do any more that retrieve/store information to the radio. It is possible to build a small device that will listen to the audio output of the radio, send audio to the radio and enable transmit. This however won't allow you to change the frequency on the radio, or any settings "live" to accomplish what ... 3 Use the satellite SO-50 when it passes over. You need nothing more than what you have now, although improved antennas would help tremendously. 3 I have a UV-5R, and both the 771 and the 701. Those antennas were the best decisions I ever made. I was having trouble hitting repeaters 1-2 km away when I was indoors. With the 771, I could hit 70cm repeaters from up to 6 km away on a good day. The stock antenna is good for nothing, throw it out and buy yourself a real antenna. 3 You might want to use a roll up antenna called the DBJ-2 from Ed Fong. See: http://edsantennas.weebly.com/ It's a J-pole antenna. I use one with my hand held and it works great! If you email Ed I think you can get your sma female connector installed on it when it is built. I think the antenna is about$28. I'm using one with my radio shack HTX-202 ...

3

Of your quoted testimonials, the one I'd put the least credence in is the 10 miles at 4w and 16 miles at 8W, because I'm not sure what they mean by the "elevation difference" disclaimer; at these frequencies even a small difference in location, especially in elevation, can make much more difference than doubling wattage. The rest seem pretty much spot on. ...

3

The correct answer to your question is, I believe, that you should expect an increase of between 20-40% in range, depending on the height of the repeater(s) you are trying to hit as well as your local propagation environment (e.g. urban, suburban, free space, etc.). I think it is a trickier question than it seems because it depends on how marginal you are ...

3

In theory, yes. In practice, "probably not". In my experience, the front end on Baofengs is not very good. We have a UV-82, and it just did not work when we tried to use it for amateur satellites (AO-91, AO-92, etc). When we replaced it with a Yaesu FT-60R we were finally able to receive the "birds". So while theoretically you should be able to receive LEO ...

3

The program is asking you which serial port you're using to connect to the radio. If CHIRP's list is empty, then you probably have no serial ports because the drivers for the virtual serial port chip in your cable aren't installed, or your cable or virtual serial port chip just isn't working. If CHIRP isn't picking a serial port for you automatically, but ...

3

The volume of the tones is typically low enough with respect to the voice signal that you can't hear it. Occasionally the tone generator in a radio will be poorly calibrated, and you do hear it. Usually the radio has a tone scan function, and you can use that to find out what tone is being used. You can also turn on tone squelch if you have the tone set ...

3

Same with SDR software. My SDR code runs on a iPhone that's connected to "HiFi" audio transducers. So I had to add a 270 Hz high-pass biquad IIR audio filtering subroutine to get rid of annoying hum when listening to NFM from local 2M repeaters. (I obviously switch that subroutine out when listening to broadcast wideband FM music.)

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