The answer from a theoretical purist is probably, "No," because your diagram specifies zero radiation outside of the disk. Practically speaking, there will always be some radiation above and below the disk and the shape of the disk will not be as perfect as you describe.
A well known solution that approaches your requirements comprises multiple ...
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 ...
Achieving such a sharp radiation pattern is difficult. There are many effects that can can cause the radiation pattern of an antenna to be less "sharp". Some of them can be fixed through engineering, such as by manufacturing components to tighter tolerances. Others are unavoidable physical limits. In the best case, diffraction will limit the ...
"MYCALL", "URCALL", "RPT1CALL", and "RPT2CALL" are used to program D-STAR channels in D-STAR-capable radios. Those columns should be left blank for analog FM channels.
MYCALL is your own call sign, eight characters maximum; "/" and suffixes are allowed, as long as everything fits in eight characters.
URCALL is ostensibly for the call sign of the station ...
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'. ...
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.
Some ways, roughly in order of increasing difficulty but also automatability:
Most repeaters have a "courtesy beep" they transmit when their squelch detects the end of an incoming transmission, followed by a period of silence. A direct transmission from a different, normal, transmitter will not have the courtesy beep and silence unless it was deliberately ...
The memory name display (and storage) on the FT-60 is only 6 characters. Your names will be truncated to that length no matter what.
The names use a limited (LCD-friendly) character set that doesn't include any lowercase letters. The Chirp driver for the FT-60 replaces any out-of-charset characters with spaces. Probably it would be better if it turned ...
A lot of the USB programming cables are not supported by the new Windows drivers that are installed automatically -specifically those with the Prolific PL-2303 USB chip set. You 'can' sometimes use them by downloading and installing an older driver. Better to get a proper cable though.
CHIRP Cable Guide
antenna that have disk like lobes
The pattern of an antenna is never going to be disk-shaped (because the directivity is angle-dependent, not limited to a volume).
But: an omnidirectional antenna (in azimuth) with a very high directive gain in elevation approximates what you want.
A simple vertical stack of vertical half-wavelength dipoles, driven in ...
If you insist on manually programming the radio, this 10-minute YouTube video should help. The programming description begins about 4:20 into the video, but I recommend watching the introductory material because it affects the programming steps.
Note an error in the voice over at 7:46. The author says, "Hit memory one more time," but he actually presses the ...
See Appendix B of the User Manual. BaoFeng calls these "CTCSS" tones, more recently referred to as "PL" tones. Page 67 of the manual describes Menu 13, which allows you to set the value of the sub-audible tone according to table C.2 on page 78.
Another common error is related to their quality control. I had a unit (UV-5R+) that wouldn't work, like that.
Contacted the seller and they sent me a new "body" - and it worked.
So in a case where you are really stuck, I suggest you contact the seller.
It seems on at least the FTM-400 series, there is a use for this. You can set the scan mode to "all mem" or "select mem":
in "all mem" mode, the radio will scan all of the programmed channels, unless they are set to "skip". In other words, this gets "select" channels plus "off/blank" channels.
in "select mem" mode, which seems to be the default, the radio ...
Some repeaters filter the CTCSS tone. If that's the case, then if you detect one, then it isn't going through the repeater. Some repeaters use a different tone on the output than on the input...also a way to tell.
CB or its close relatives fall into the HF frequency range (covering somewhere around 26 to 28 MHz, depending on country), so anything that accurately calls itself a VHF radio will not transmit (and most likely will not receive) CB.
In general, what you do to answer this kind of question is find the radio's specifications — either on the web site or in the ...
Just starting out here I currently don't have the rep-points to upvote his post, but I think that N3CAN is exactly correct. Regrettably the so called HotKeys on the Anytone 878 and 578 just seem to be something like "Links" or shortcuts to submenus, which then can be used as an assigment to one of the function keys, so the name is a little ...
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 ...
Why would I want an authentic FTDI chip for technical reasons?
With the FTDI-supplied silicon containing several bugs already, my wild guess is that cheap knockoffs are really bug-ridden.
The likelihood that you encounter such a bug when really just using the thing to run a relatively low-speed UART is pretty much 0.
So, as said, FTDI's products' ...
It is highly unlikely that the station transmitting on the output of the repeater will have exactly the same signal strength as the repeater transmitter. Simply monitor the signal strength of the transmission and if it is not typical for the repeater output, the station is likely transmitting on the output.
Yes, it's compatible.
According to baofengradio.us, the compatible models are
UV-5R and UV-5R V2+
BF-F8+ and BF-F9 V2+
UV-82 and UV-82 V2+
BF-888S and the ATR-22
With that information, I have connected the UV-5R and I was able to use the Chirp software with it.
An embedded message allows you to leave a user defined artifact in the memory of the radio that can be recalled by the programming software. This can be used for things such as to identify the specific radio, to identify the source file from which the radio was programmed, to identify the company or individual that programmed that radio, the time and date it ...
I found an answer for this online.
Apparently there's a bug in the firmware of the various BaoFeng handie-talkie models (UV-5R family, BF-F8HP, and others) that causes frequency offset to revert to zero when in channel mode, regardless what was saved in any channel memory.
I found this online document that gives the work around for it:
One must program in ...
There are online instructions and YouTube videos on how to program a BaoFeng radio -- it's the same for all or almost all of their HT models, so if you find instructions for a BF-F8HP, for instance, they'll work for the UV-5R.
The radio, however, doesn't really support half-kilohertz precision in frequency entry from the keypad, so you'd be ahead to spend ...
From what I remember, after you program the Hot Keys, you then need to apply them to an actual key (PF1, PF2, PF3, P1, P2) to access them. Basically they are like functions that you can define (things that are not otherwise available for key assignment).
If you look at the options that are available for, let's say the PF2 key, Hot Keys 1-6 should be ...
The green key appears to have the name "Func", even though I can't find that actually in any manual. You long press the green key, and then can trigger 0-9, and * and #.
On my brand new 878, a long-press of the Menu key acts as the 'Function' button (not sure that's in the manual anywhere, either). The Green key (PF3) is assignable as all the other ...
I have not found any of the Alinco models in CHIRP to work with the DR-635T. In an effort to add it none of the methods used by the other models returned any useful data. I tried contacting Alinco for information but was ignored.