The guy who runs Import Communications has good customer service. I was one of the early adopters of the Anytone -E radio, and the original antenna from the factory was dual-band, not tri-band. I received a replacement tri-band antenna without even having to contact the seller--it just showed up in the mail. You can't hardly beat that.
Looking for handheld with full duplex capabity/decent front end and display
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The more I look into this, the more it seems that perhaps only the Kenwood TH-D72a can REALLY do full duplex reliably. I know the AnyTone has been demonstrated to work, but I want something that really works well.
Anyone ever tried setting up 2 of these radios for a full-duplex conversation?
Anyone ever tried setting up 2 of these radios for a full-duplex conversation?
Sort of. The radio allows it, but results vary depending on the TX/RX frequency separation. If you only have a few MHz of freq separation, it works OK, but not awesome. If the input signal is weak, the repeater will cycle TX on and off as the TX desenses the RX. But the farther apart the TX and RX freqs are, the better it works. Once you go cross-band, it works great.
Yes, it can full duplex on separate bands. Talk on 2m and listen on 70cm or vice versa.
That would technically be half-duplex. A cellphone or wired landline are full-duplex since one can talk and listen simultaneously.
In crossband mode though, one can talk or hear, but not simultaneously...
In crossband mode though, one can talk or hear, but not simultaneously...
That would technically be half-duplex. A cellphone or wired landline are full-duplex since one can talk and listen simultaneously.
In crossband mode though, one can talk or hear, but not simultaneously...
I'm talking about full duplex audio. Talking and listening simultaneously, which is what the radios we are discussing can do, with varying success.
I'm not sure what you are talking about.
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My comment was directed in response to the post immediately proceeding mine (W9BU's reply).
prcguy
Member
I also know Ed at Import Communications and he will treat you right. His company started as KMA Antennas and I've purchased a lot of those but when the Chinese radios came along his business focused mostly on radios.
I was also an early adopter of the Anytone AT-3318UV-E and D versions and can say they are the best Chinese radios I've used so far. They work fine in heavy RFI areas where Wouxns and Baofengs fall apart.
On the duplex thing, I've used my Anytone hand helds as cross band repeaters and they work great for that, but you will not find any radio that is designed to run full duplex within the same amateur band without an external duplexer. If someone can get one to work with some odd offset its a fluke and the receiver will be crippled at best.
prcguy
I was also an early adopter of the Anytone AT-3318UV-E and D versions and can say they are the best Chinese radios I've used so far. They work fine in heavy RFI areas where Wouxns and Baofengs fall apart.
On the duplex thing, I've used my Anytone hand helds as cross band repeaters and they work great for that, but you will not find any radio that is designed to run full duplex within the same amateur band without an external duplexer. If someone can get one to work with some odd offset its a fluke and the receiver will be crippled at best.
prcguy
So what about full duplex with the send/receive frequencies NOT in the same band?
Have you tried the Kenwood? If so, how did it perform against the AnyTone in full duplex operation?
prcguy
Member
I've only tried the Anytone a couple of times in full duplex cross band with earphones and it works fine, otherwise I have no reason to run in that mode. I've never tried the Kenwood.
prcguy
prcguy
If you haven't tried the Kenwood, then how can you say that it won't work?
Right, well, he's also saying speak and listen simultaneously. That's full duplex audio. I'm still not sure what you're talking about.
prcguy
Member
It takes thousands of $$ of duplexer with a very clean transmitter and robust receiver to full duplex within the 2m amateur band. Why do you think a cheap hand held could possibly do that with any usable results? Maybe you found two frequencies at the opposite ends of the band where another radio in the same room could be heard while you are transmitting 3ft away but otherwise its impossible for a handheld to do full duplex within the same amateur band with any useful results.
I've been building and servicing amateur and commercial repeaters for a very long time and have a little experience on what it takes to run full duplex within the same band and its not a trivial thing to do. If Kenwood had a radio that could pull off such magic as full duplex within the same band and without an external duplexer it would be all over the news.
prcguy
I've been building and servicing amateur and commercial repeaters for a very long time and have a little experience on what it takes to run full duplex within the same band and its not a trivial thing to do. If Kenwood had a radio that could pull off such magic as full duplex within the same band and without an external duplexer it would be all over the news.
prcguy
Gotcha, so again, you're simply stating IN-BAND full duplex isn't going to happen with any of these HTs. No issue for me, I'm happy to receive on one band and transmit on another. I always assumed it would need to work that way.
I mistakenly thought that you were saying that none of these radios could do full duplex AT ALL. What it seems like is that all can do it, some better than others.
Keep in mind, that the duplex is not designed as such. It is a secondary, from full independent usage of the two bands.
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