Hot answers tagged

29

None of them. You say you are in the United States. In general, 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, ...


19

It'll be easier just to buy a programming cable and use the free Chirp software to turn off transmit permanently. I did this, and used my Baofeng as a receiver only before getting my licence. EDIT - When I mean permanently, I mean the radio will not respond to the transmit key being pressed. If you get your license in future, you can reenable this feature ...


18

Every time I purchase a cheap HT such as the Baofeng you mention I also spend another $10 or so on an antenna, as the stock antenna is noticeably worse than even an inexpensive antenna like the Nagoya NA-771. There are still better antennas than this, but there are always tradeoffs. The stock antenna is one third to half the length of the NA-771, which is ...


14

The basic PTT (push to talk) button on the HT is a simple switch that is normally open and when it is pressed, the switch is closed (conducting). Internally to the radio, this applies power to the PA (power amplifier) stage of the transmitter, it idles the receiver, it switches the frequency synthesizer to generate the correct transmit frequency and a number ...


11

Requirements: Less than $100 Commercially available Better reception than stock antenna Excellent portability Recommendations: Nagoya NA-771 Nagoya NA-701 Tram 1185 (Vehicle) Nagoya NA-771 Cost: $11 on Amazon.com as of March 2014 Length: 396mm Weight: 37g Nagoya NA-701 Cost: $10 on Amazon.com as of March 2014 Length: 211mm Weight: 40g Tram 1185 Cost:...


10

I did a bit more reading, and it seems that the new version of the firmware meant I needed to use a different chirp profile. The solution that worked for me was to find a factory image from a radio with the firmware version I have (which Chirp reported), then import my channels via csv, and clone that resulting image onto the radio.


9

According to the detailed menu descriptions on the Miklor site: 35 - STE Transceiver - Squelch Tail Elimination This function is used eliminate squelch tail noise between UV-5Rs that are communicating directly (no repeater). Reception of a 55 Hz or 134.4 Hz tone burst mutes the audio long enough to prevent hearing any squelch tail noise. ...


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

If you haven't seen them, the RTL-SDR dongles are really hard to beat for scanning. They let you see a waterfall display so that you can see visually which frequencies are active. It's wonderful!


8

Almost nobody programs Baofeng and similar radios by hand: too difficult, as you discovered. The thing to do is to get your hands on a programming cable and programming software. If you go to a meeting of a ham radio club, there's a good chance that someone will have the cable and the software right there, and will be able to program your radio for you in ...


7

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.


7

Yes, kind of. You can program the A and B settings separately. Set channel A to display name, and set B to display frequency. Also, set the receiver to only listen to the monitored channel to ensure you won't run into problems. Then, in channel mode, use your programmed station (ex station 12) on both A and B simultaneously. A will show your channel name ...


7

I would first measure the current draw of your ESP32 to rule out a fault there. The +V pin on the Baofeng microphone connection is probably intended to bias an electret microphone. These are essentially a capacitor, with sound pressure changing the spacing between the plates and thus the voltage. They contain a FET buffer since the capacitor could not drive ...


7

With no load, I measure 3.17V With 100kΩ load, 2.91V With 10kΩ load, 1.59V With 1kΩ load, 0.29V The math works out to a 10kΩ series resistance between +V and ground. As such the maximum power that can be drawn is at 1.59V/10kΩ load, or 0.25mW max power. Short circuit current would be about 0.3mA.


6

Chirp can only disable Transmitting on pre-programmed memory frequencies, if you select the vfo it will still transmit. Searching Google for 'uv5r transmit inhibit' yielded this on the fifth hit http://www.bytebang.at/Blog/Locking+down+a+Baofeng+UV5R%2B+to+disable+unintentional+TX "Within the Uv5R there is a thin rubber pad that pushes against the TX ...


6

Unfortunately not in the eyes of Ofcom. While you can restrict the power usage down to 0.5 Watts, the antenna is removable. You'll notice that most of the stuff sold on the high-street will have solid antennas. For the PMR frequency use, as part of the "license-free agreement", apparatus in use must meet the high-street requirements. Worth noting though, ...


6

Don't bother. CTCSS tones are not an effective privacy mechanism. Anyone at all with a FM two-way radio or scanner can receive your transmissions; attempting to prevent this by locking down your radios gives you only the illusion of privacy. (P.S. This site is for Amateur Radio, and I'm guessing you're actually a commercial radio user. I'm answering your ...


6

As far as I've read, all Baofeng radios do FM only. The majority of aircraft communications uses AM, so whether or not it can be tuned there, you would not hear the audio, just approximate silence (quieter the stronger the signal). This is because to a FM receiver's perspective, an AM signal is unmodulated (the frequency stays constant), and vice versa (in ...


6

No, you cannot display "Name & Frequency" if the unit is in "Channel Mode". what you could do is program (part of) the frequency in the "Name field" of the channel. This way it helps you, like a hint, of what frequency the channel is set to. Obviously it will get more complicated if you have different RX and TX frequencies programmed in the Channel, ...


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

The antenna included with the BaoFeng is notably bad, even for a rubber duck. To answer your question of what would be better: anything would be better. You'd have to switch to a dummy load to do worse. Whatever antenna you do select, it need not be anything specific to your radio. Any antenna suitable for whatever bands you wish to operate will be fine. ...


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

You want your switch to short the shield of each of the connectors to each other, strange as that sounds. These plugs are commonly known as TRS, or tip-ring-shield, so the shield is the part closest to the body of the plug. The ones you want are both marked PTT in this image (don't let the other stuff confuse you, these pins do multiple things when connected ...


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

I have a Baofeng handheld with similar specifications, and the short answer is no, it does not function as a repeater in any way - cross band or otherwise. I would imagine that would be a feature they would be quite specific about. The long answer is that you can operate between both bands to use a cross-band repeater or satellite. Using software like Chirp,...


5

One other setting for each channel that may be giving you problems is Duplex/Simplex. Make certain it is set to Simplex or equivalently "no offset". This feature, when turned on, causes that channel to transmit and receive on different frequencies - typically for using the radio with a repeater. Viel Glück!


4

The BF-888S radios have a 16-channel knob on the top and no LCD display nor a number keypad. The BF-888S is marketed all over the world for use mostly in licensed commercial operation or licensed Amateur Radio. The BF-888S can be programmed to use frequencies in the range of 400 to 470MHz which nicely permits programming the radios for the 70cm Amateur ...


4

The usability of the Baofeng (or any radio with > 1Hz frequency step) will depend on the frequency and mode that you are using. If you use a 12.5kHz frequency step size you will never be able to tune to 435.345 MHz (FM mode) frequency, for example. You have to change your frequency step size to 5 kHz or 2.5 kHz to tune it. Notice though that the Baofeng has ...


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.


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