What is Simplex versus Repeater (Duplex) mode in Ham and GMRS radio. Updated Apr 5, 2022.
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- Опубликовано: 4 апр 2022
- This is a slightly updated video of a previous video I posted. I created a dedicated channel for just Ham Radio and GMRS here.
A short and simple explanation of what the words SIMPLEX and REPEATER (DUPLEX) modes mean in 2-way radio communications. DUPLEX is another term used to describe a repeater frequency pair because the transmit and receive frequency is not the same frequency. Another meaning of DUPLEX is when some commercial grade mobile radios (ex: Motorola) can both talk and listen to a repeater at the same time, and hear themselves as they are transmitting. For this reason, the term REPEATER is more commonly used than DUPLEX. SIMPLEX & REPEATER is used in ham radio and GMRS when operating on the VHF & UHF bands. Simplex is point-to-point, line-of-sight, direct radio transmission between two or more radios all operating on the same transmit and receive frequency to talk and receive. Repeaters are typically high elevation relay stations that repeat the transmission of one radio on a frequency, and re-transmitted on a different frequency where the listening radio will be receiving and listening. This happens automatically. I will explain how the repeater frequency set up in the radio is done in more detail in another video. #ham #simplex #duplex #repeater
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thanks for the effort in explaining simplex and duplex
Thanks. Simple and informative. 👍
thank you.
Thx. Great explanation
Excellent explanation! Great video!
Thank you.
Fantastic explanation
This is a well made video! Simple and to the point. The only change I would make is the color of the arrows denoting duplex transmissions, so that the color denotes the shift in transmission frequencies. For beginners this is an excellent video. And the graphics are nice too! Here are your thumbs up… 👍👍👍👍👍
Thank you. Excellent idea. I will do have to do that in another video explaining repeaters.
Thank you for the suggestion.
Easy for even a newbie like me to understand. Thanks👍
Thank you. That great to hear!
thank you for good information .
Glad it helped you.
Good Job ❤
Excellent
Thank you!! Glad it helped.
Nice
This concept all applies to GMRS radio
can you have radio to radio duplex?
Excellent job
I love this! What happens if I'm in Los Angeles and I want to transmit to riverside. Would I need to find a repeater that is linked to that mountain?
Hi Damian. Yes, a repeater would have to be used to reach that distance. (Unless you happen to be physically located atop a mountain.) I was on a hike up on a 1,000 foot hill in San Diego yesterday and was able to reach the Catalina Island repeater (75 miles away) on a hand held. Elevation is key. In the real world though, yes, a repeater will retransmit your signal great distance. Also, some repeater systems, like the PAPA system in Southern California, have a network of linked repeaters that covers half the state. There are some open repeaters on both 2 meters and 440 that should cover that area you are asking about.
@raysiposs9822 I and the receiver would only need to connect to the same repeater or each other on a linked repeater to hear one another? It's not like I need to program two repeaters to chain the connection?
@@damian3182 Correct. You are only communicating with a repeater on a mountain. The repeater does the retransmission or relay for you. The person you are talking to on the other end is doing the same thing-talking to the repeater. You hear each other by going through that repeater relay. So just on repeater will do that. Networked or linked repeaters will interconnect, but that is done mountain top to mountain top. I just posted another video on my other channel that talks a little further about the frequencies used. ruclips.net/video/hPQnWTZIGBo/видео.html
@@raysiposs9822 awesome! I'll check it out.
Santiago Peak is a great repeater.
KK6KTZ
does repeater duplex we can hear the feedback on our voice? or just pass through like direct
It just relays, or passes-through the voice in real time. If you want a playback of your voice, the repeater would have to have a voice-recorder capability in the repeater's controller hardware itself (which some can do), but it is not commonly offered on most analog repeaters. DMR Digital Mobile Radio repeaters offer that option via the Brandmeister server, but that's another topic for digital radios.
@@raymazonhamradio thanks
sir how to send a call to a radio without repeater to 2 kilometers far
It will depend on how many objects are in the path, in the way. If you were on a building rooftop, and able to see over other buildings, you could perhaps reach that distance. If you can see it, you can talk to it. Gaining elevation almost always helps greatly. This is why you will often see radio communication antennas located high on a rooftop.
How does it transmit in different frequencies if both radios are on the same frequency
See if this video explains it for you.
ruclips.net/video/hPQnWTZIGBo/видео.htmlsi=-l8GV_U2hqHo0iXH
@@raymazonhamradio thank you
@@davidsteckley8846 You are welcome!
@@raymazonhamradio I’m studying for an exam on Monday and I’m learning that this stuff is far more complicated than I thought. I’ve been given things to study, and those are the things I’m trying to learn. This puts it in a little more perspective. Technically I should probably go to school, but for me this would be a promotion under a training and development (TND) for a training position. That’s why I applied for it
@@davidsteckley8846 That's good to hear. It will be worth it for you in the end. It's a very useful thing to learn, and you will have fun with it too. Preparedness is getting popular, and radio communications is an important tool. Even for people that go hiking or camping, it can easily save your life. We forget the simple challenges we all went through while learning radio communications back in our own beginning. I've considered the idea of putting a course together, so the feedback is appreciated. Good luck on Monday.
Well made video but you got it wrong. Sadly theres a lot of comments that says tanks for the explanation. en.m.wikipedia.org/wiki/Duplex_(telecommunications)
Thank you for the feedback. In order to correct my error, can you please elaborate? Duplex has several meanings and I want to make it better understood.
A repeater is usually a duplex repeater, meaning they can hear and talk at the same time, though there can be “store and forward” repeaters which are very rare and almost none existent.
Many commercial radios have a setting on the control head labeled as “duplex” as the mode for the “repeater” mode of transmission, vs simplex operation for talk-around. They just use the nomenclature of “duplex” rather than “repeater”.
Then there are radios such as Motorola mobile radios that have the internal circuitry to allow it to operate in full duplex mode in the car where they can transmit and receive at the same time, which allows the radio operator to receive themselves as they transmit coming back from the repeater, or the network of repeaters.
Commercial grade Motorola mobile radios are heavily used in repeaters because of this highly sought after ability of being able to easily duplex, and their ability to withstand continuous transmit duty cycles.
In a mobile environment, on a fully duplexed radio, if the volume is turned up too loud, you get into an echo or feedback condition when hearing yourself returning from the repeater. The advantage of running mobile duplex while on a network is that if another station on a full-duplex linked repeater keys up elsewhere on the system, then the first operator will hear the interrupting station comment in real time.
Most linked repeater networks are full-duplexed networks, but not all are. Full duplex has some advantages for the control operator of the network while admin level controlling the system.
So it depends on which definition of duplex is used; the one that some radio manufacturers use on their radio product control function labels, or the transmission mode.
Again, if I misstated, let’s get it corrected. I was referring to the control function label found on many radios when using the term.
Thank you for the input.