Ok. Looks like a nice radio.
Can you elaborate?
I'm in the entertainment business and am very familiar with wireless comms. Full-duplex is widely used for event communication.
What requirement specifically?
Looking for handheld with full duplex capabity/decent front end and display
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LMR is made for simplex, or half-duplex, not full duplex. Meaning, it is for paging, or one at a time two-way transmissions. At no time are two users transmitting at the same time, and producing two useful signals. (Either one transmission wins, or both are garbled to the point of being unintelligible.)
If you want something that is full-duplex, like a telephone, then you need to look somewhere other than the LMR world.
There might be some WiFi options, or having to use cellular technology.
When I mentioned the needs for full-duplex, simultaneous transmissions need to be isolated from the receive. This requires significant filtering, for signals in nearby frequencies, or significant frequency separation, typically on different bands.
This page has some related info.
http://www.amateur-radio-wiki.net/index.php?title=What_is_a_cavity_filter?
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If you use an earphone instead of a speaker, the Anytone will simultaneously RX and TX without audio bleedover. They are nice cross-band repeaters as well.
There seems to be conflicting opinions here as to whether or not an HT can do full-duplex. Maybe there's something I'm not understanding?
I do get that the transmit and receive frequencies would need to be VHF and UHF to keep them far apart from each other, but other than that, do these radios that list full-duplex operation actually work?
I searched for "demos" of full-duplex operation, and I can't find anything in English, but I did find this video:
https://www.youtube.com/watch?v=lom6EauIpl0
It seems to show full-duplex operation, albiet with some interference.
Comments?
I do get that the transmit and receive frequencies would need to be VHF and UHF to keep them far apart from each other, but other than that, do these radios that list full-duplex operation actually work?
I searched for "demos" of full-duplex operation, and I can't find anything in English, but I did find this video:
https://www.youtube.com/watch?v=lom6EauIpl0
It seems to show full-duplex operation, albiet with some interference.
Comments?
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Project25_MASTR
Millennial Graying OBT Guy
Check out the Simoco SD* series of mobiles and portables. They are capable of full duplex calling (by receiving on TS1 and transmitting on TS2) though it's not a common option that is used. Since the Xd repeaters have an included SIP gateway it was really designed for integration to a PBX but it will work without.
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I have the Anytone AT-3318UV-E, and if you connect an earphone, you can listen to one frequency while talking on another without TXing the audio your listening to. It works best when you're using separate bands, but works reasonably well in-band if the freqs are a few MHz apart and the RX freq is reasonably strong.
My Kenwood TH-78, TM-741, and TM-V71, all do that. I believe I can make my TH-F6 and TH--D72 do that, too. None of them are rated for 100% duty cycle, but you might be able to get away with it on the lowest power setting, for a short time.
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Ok, so it looks like a new list of currently-available full-duplex radios is emerging...
The Simoco and Kenwoods are more money than I'd like to spend. The Anytone and Wouxun are quite inexpensive in comparison. The jump is pretty huge. From a $99 radio to a $500+ radio. I don't mind $200 or even $300 if needed, but 5 times the price?
Anyway, I'm torn between the Wouxun KG-UV8D or 9D (which are reported to allow full-duplex audio operation, but I haven't found anyone who can demonstrate or has tried full-duplex with) and the AnyTone product, which I haven't seen a demo of the full-duplex operation of, but I understand has been tested by jonwienke. (care to post a YouTube?) ;-)
The AnyTone doesn't have some of the features (no channel announce, for example) that I'm looking for that Wouxuns have, so if the Wouxun can't do it, I might be SOL.
Argh.
https://1drv.ms/v/s!ApJIS-l4xqPtguAytyuuEt1XDCTogg
Ask and you shall receive. TX on UHF while RX on VHF.
Wow! Thank you so much!
The audio we're hearing is coming from the AnyTone, correct?
Is it my imagination, or does the audio tone (i.e. frequency response) change a little when you press the PTT? It sounds like it gets a little thinner.
If you actually speak into the AnyTone after pushing the PTT, does it affect the audio being received?
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Yes, no, and no, at least when RX and TX freqs are in different bands. If you plug in an external mic with an earphone jack, the RX audio has no effect on TX audio, and vice versa.
The radio will actually do simultaneous TX/RX in the same band, but if the RX signal is weak, it will cut out or get staticy when you TX. But if the RX and TX freqs are a few MHz apart, it works reasonably well.
Very cool. The demo and your endorsement speaks volumes.
So, next test is 2 full-duplex radios speaking to each other with both PTTs pressed simultaneously and a full-duplex conversation happening. Do they feed back? If so, then how about when using an earphone?
So if the radios are far enough away from each other that the mic on Radio A cannot hear the speaker on Radio B, then they do not feed back, even without earphones?
If so, that's very impressive indeed!
Correct. Note that there was no feedback in the video, because the scanner volume was turned down low.
I don't own any other model of Anytone radio, so I won't comment on their performance. But this particular model (AT-3318UV-E) is quite impressive, especially for a CCR.
Great info. The information you've given as well as the video is the best information I've gotten on this subject so far. So much out there is just opinion or misunderstanding of the feature.
You should add a demo of actual speech between 2 radios and post your videos to YouTube!
Thank you again!
The thing that concerns me about the AnyTone is that there seems to be just the one dealer in the USA and not much of a support network of users (compared to Baofeng and TYT for example). Companies come and go all the time and it would suck to be stuck with a product that has no support, parts, etc.
Also, the strange thing is that the USA dealer sells products that aren't listed on the AnyTone page, and the products listed on the AnyTone page aren't sold in the USA.
Also, the strange thing is that the USA dealer sells products that aren't listed on the AnyTone page, and the products listed on the AnyTone page aren't sold in the USA.
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