Hi,
I have been trying to follow this confusing discussion about "Full Duplex Radios". It seems to me that different people are using the same term to mean different things.
Everyone seems to agree on the meaning of "Full Duplex" as the term is used when talking about Ham satellites and radios. It is a radio that allows you to listen on one frequency in a particular band, while simultaneously transmitting on another frequency in different band.
However, the phrase "Cross Band Repeater Mode" seems to have two meanings as it is being used on this reflector right now.
Meaning One: a radio the can be used with a cross band repeater somewhere. That is, a radio that can be set up to receive in one band, but switches to another band when the PTT is operated and the radio transmits. When this radio transmits, the receiver is turned off.
Meaning Two: a radio that can be configured to function as a repeater in that it retransmits the received signals in a different band. Naturally, it does this simultaneously. It is a Full Duplex Radio.
Most (all?) modern HF radios can do "Meaning One" (A/B VFOs, etc), as can many dual band UHF/VHF radios, so this is perhaps not particularly unusual. It might be better to reserve the term for those radios that can function as a repeater.
Sil - ZL2CIA.
Not exactly. Full Duplex can be both receive and transmit simultaneously in the same band or on the same frequency. Doesn't have to be in different bands.
Sigil wrote:
Everyone seems to agree on the meaning of "Full Duplex" as the term is used when talking about Ham satellites and radios. It is a radio that allows you to listen on one frequency in a particular band, while simultaneously transmitting on another frequency in different band.
Nigel Gunn G8IFF/W8IFF wrote:
Not exactly. Full Duplex can be both receive and transmit simultaneously in the same band or on the same frequency. Doesn't have to be in different bands.
Nigel,
Yes, of course, that's true. A single band repeater is a full duplex radio.
I don't think their are any Ham radios that operate full duplex in a single band. Of course, I could easily be wrong. Do you know of any?
Sil
There are plenty of commercial receiver/transmitter pairs but they all need external filtering. I don't know of any amateur transceivers that fall into that category.
Sigil wrote:
Yes, of course, that's true. A single band repeater is a full duplex radio.
I don't think their are any Ham radios that operate full duplex in a single band. Of course, I could easily be wrong. Do you know of any?
participants (2)
-
Nigel Gunn G8IFF/W8IFF -
Sigil