Questions tagged [repeater]

A device that receives a signal and re transmits it either in the same band or by re-modulating it in a different band.

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38 views

Repeater transmit voice message/warning on input frequency?

I'm in the process of planning a UHF CB radio repeater. And I've heard there are ones around that transmit a voice message/warning on their input frequency (as well as standard output channel ident) ...
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88 views

How does a Baofeng radio know an incoming transmission is from a repeater?

Baofeng radio's have two menu options for squelch tail elimination (STE). Item 35 is for general simplex STE, and item 36 is for repeater STE. My question is how would the radio know if a transmission ...
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102 views

Ham radio repeater

I am wondering if using a VHF/UHF ham radio for emergency (I get injured, become ill, run out of water/food, etc.) communication while hiking the Continental Divide Trail would be possible. I see that ...
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2answers
51 views

Why do repeater duplexers have notch cavities between transmitter and antenna?

Why are notch filters used on the transmit side of a repeater duplexer? The primary purpose of a duplexer is to keep the transmitter output out of the receiver input, since they both operate at the ...
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1answer
38 views

Hypothetical question: Repeater with power amplifier

This is my first time ever asking a question on stack exchange or any stack site, so please be gentle if I missed something here. I am currently working on building a UHF (GMRS) repeater, and while ...
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1answer
45 views

Repeater carrier as access

I'm just getting into ham radio. I'm trying to connect to a repeater here in Ireland: Channel: RU260(RB10) Output: 433.250 Input: 434.850 Call sign:EI7SHR Access: Carrier What does the "...
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1answer
71 views

Help with Repeating 439 MHz signal

I have a remote wireless water tank level sensor. It transmits at 439 MHz with an apparent max range of 100 metres. Unfortunately I need about 200 metres. How can I extend that range?
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1answer
86 views

Talk Around vs Reverse

I thought that "Talk Around" and "Reverse" were two ways of referring to the same thing: swapping a channel's transmit and receive frequencies so that one could e.g. listen for ...
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2answers
838 views

Beginner listening to a repeater - only hearing one station

This morning I tuned in to a repeater about 12km from me (in the UK). I could hear activity, but from only one station. I could tell that there were other stations using that repeater from the ...
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1answer
105 views

When are licenses required for 900 MHz operation in the US? When are they not required?

Forgive me if this is not the proper forum, but I am an electrical engineer and a total radio novice. I am designing a product that may contain off-the-shelf industrial radios that act as repeater ...
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2answers
123 views

Why is a separate repeater required for digital modes? Why can't an analog repeater be used for digital modes?

Regardless of the mode: digital or analog, the radios always transmit sinusoidal EM waves. So wouldn't a regular analog repeater be able to rebroadcast that EM signal regardless of its encoding?
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3answers
153 views

Can one repeater be used to hit another repeater?

Here's why I wonder about this: I would love to be able to reach an Echolink-enabled repeater or similar, but I live on the other side of a ridge that would probably block a transmission to the ...
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1answer
163 views

Repeater Features: What is e-power and link?

I am so new to ham radio that I don't even have a transceiver or a certification study unit yet. Just learning all I can right now. So, I'm looking at a repeater that I might be able to reach with a 5-...
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2answers
1k views

What are the regulation requirements for running a repeater?

When I try to find information on the requirements to run a repeater, I just see a lot of results related to building one. But I'm wondering about USA regulations. Does one need a particular license?...
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1answer
65 views

Baofang uv-5rA/ repeater trouble

I programmed my Baofang UV-5RA radio to my local repeater about less than a 1/4 mile away. When I cue the mic and release, I get a signal from the repeater. However, I can only hear people if I have ...
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1answer
286 views

Are there any “parrot” repeater software projects out there?

I happened across a discussion on building repeaters for Amateur radio, which lead to looking at GMRS repeaters (because apparently this is a potential source for inexpensive 70 cm Amateur repeaters), ...
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4answers
243 views

Is there a freely accessible repeater database?

The well-known repeater listings/apps don't provide a database that you can download and use freely for any use in building your own app. Is there a such a freely accessible repeater listing database ...
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5answers
273 views

Malicious interference to repeater

Our local repeater is severely sabotaged by unknown parties. For example, broadcast radio transmissions are repeated. Other times someone will send a transmission, when a qso is in progress. Local ...
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1answer
50 views

Audio too high, how to troubleshoot

I am using a TYT TH-9800 with a 10 m half dipole antenna on low power (5 W) to connect to a WIN linked repeater (+5.0 MHz offset and 123.0 tone). I made contact with two other stations and was told ...
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1answer
124 views

What is meant by CC 7?

I am seeing a repeater on RepeaterBook 444.8375 +5 MHz CC 7 Portland, Providence Portland Medical Center Multnomah WA7HAA OPEN ON-AIR I'd like to programme ...
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2answers
57 views

Local Relay with static

On our local Relay there are from time to time transmissions, where only static can be heard. Most transmissions via relay can be heard clearly. What could be the cause of this?
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1answer
77 views

New quad-band mobile receives while transmitting?

I've got a week-old TYT TH-9800, a quad-band (10/6/2/70cm) mobile, Chinese knock-off of a Yaesu HT-8900. So far, I love it -- several times the power of my HT, and a better antenna actually outside ...
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125 views

How to plot transmitter coverage area?

As an Extra class licensee, I should probably know this... I am working on a web application for repeater owners. I would like to include an estimated coverage area, provided they have entered all of ...
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1answer
214 views

How come wifi repeaters aren't just amplifiers?

Not sure if in scope for ham SE. I'm very new to this. Most wifi repeaters contain an actual router and two radios set up to receive and transmit at different frequencies. Why can't we have a wifi ...
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3answers
785 views

Call sign ID for a “homebrew” or improvised repeater?

I saw a couple YouTube videos last night about setting up a repeater using a pair of cheap hand-held radios and, at its simplest, an audio patch cable to connect the speaker output of one radio to the ...
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3answers
1k views

How can I be sure I'm actually hitting the repeater?

I'm just starting to use 2m and 70cm bands, which normally use repeaters to extend range beyond a mile or two (limited mostly by line of sight, as I understand it). When I'm at home, however, I'm not ...
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1answer
661 views

How do I set the “tone” in my new BaoFeng BF-F8HP?

I just got this new 2m/70cm hand-held, my first ham rig. I neglected to order the computer connection cable with the radio (it's on the way, and I've already installed the Chirp software on my Linux ...
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3answers
539 views

In-house repeater?

At one time I was active in the local SKYWARN program, but then we moved and I find myself 10 miles from the local repeater. Given the various obstructions between it and me, I can't really hit it ...
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2answers
282 views

From where do repeaters get their power supply?

I imagine that a repeater atop a building for which the repeater owner has sought permission would be sharing the same power source as that of the building occupants, but: What if the repeater is ...
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1answer
235 views

Should I add call signs with /R suffix to the logbook?

Sometimes in FT-8 mode I receive calls like this one: It happens 2-3 times a week. The problems are: 1) I never could look up such call signs 2) I tried to reply, but never got answer 3) I don't ...
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1answer
85 views

Who has the ability to physically manipulate a repeater's controls?

I know that repeaters on VHF and UHF are primarily automatic, but there will be times when they will fail, or something is not working. The repeater may not respond to the remote control. In these ...
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1answer
244 views

How to clean up profanity on airwaves

We have a repeater here in Southern California (Sylmar K6GE 147.435), and no matter what time of day or night there are a great many operators spewing tremendous profanity, disrespect and meanness ...
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507 views

How can I tell if someone is mistakenly transmitting on a repeater output frequency, instead of the (offset) input frequency?

I sometimes run a VHF radio net for our club, on a 145.170 MHz channel served by a repeater with a -600 KHz offset. People who program their transceiver with the proper repeater offset mode use it ...
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199 views

What should I put on a QSL card for a repeater contact?

From time to time I'm a new ham's first contact - usually on a repeater. If I want to send the new ham a QSL card, how should I distinguish a repeater contact from a non-repeater contact? Is there a ...
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1answer
94 views

Repeater for 1/4 square mile campus

I am a noob to a lot of amateur radio and I am investigating and planning a repeater setup to be installed in my workplace. We are on a hospital campus in Chicago, IL and have many tall buildings ...
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2answers
111 views

Repeating UHF Handheld via UHF vehicle transceiver

I have recently taken on programming radios for my workplace in Chicago, IL. We have an old base station (Kenwood TK863G-1) that I wanted to know if it would be possible to use as a repeater similar ...
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1answer
289 views

Using a Duplexer and Diplexer in Series

I have 3 Motorola CDM750s that I’m using to build a multi-purpose, portable, temporary repeater. There are 1 VHF and 2 UHF radios. I want to be able to use it as either an in-band UHF repeater or as ...
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3answers
2k views

Why can't I hear myself from a second radio when bouncing off a repeater?

I am a relatively new ham, and haven't joined any club yet or participated in any nets. I have, however, hit a repeater just to know I can do it. I was told my sound was scratchy (no surprise there) ...
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1answer
222 views

building a relay for 5.8Ghz?

I'm interested in building a relay for analog video sent from an R/C aircaft. The idea is to get around obstacles like hills and increase distance a bit. Rather than just applying more power, I ...
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2answers
383 views

How do 0 offset repeaters differ from offset repeaters?

I found a listing for a repeater with 0MHz offset and I don't know what to expect from a repeater like this that is different from a traditionally offset repeater. repeaterbook.com/repeaters/details....
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235 views

Trouble figuring out what is meant by this repeater callout?

On a repeater I frequently listen to there are a handful of expected automated messages. Namely, at the top of the hour it tells the time and the callsign, and every 10 minutes it sends out it's ...
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1answer
60 views

Maximum size of a command on an RLC Club Deluxe 2

With reference to an RLC Club Deluxe 2 repeater controller: What is the maximum size of a command? What is the maximum size of a macro? The manual does mention "Limits on Macros" but all it says is: ...
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1answer
154 views

Empty Repeater Slots and Percent FM when downloading D-STAR repeater list

When downloading a repeater list from dstarinfo.com as shown in this video: https://www.youtube.com/watch?v=BJCvLsK1cKc, there are two numeric fields: Empty Repeater Slots Percent FM What are they? ...
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85 views

Tune step not being small enough?

I recently got an Icom ID-51E PLUS2 and its smallest tuning step is 5kHz. I looked at the list of repeaters in the UK and many are between 5kHz stops, such as 145.6125MHz. Is this expected? Do you ...
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1answer
213 views

Two devices + one antenna

What I have: GSM 900 repeater 900 - 2400 MHz MIMO antenna 2xSMA MIMO 4G Router works with 1800 MHz LTE Is it a good idea to connect GSM repeater via SMA splitter to one of the antenna cables? Will ...
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1answer
551 views

440 MHz repeater, how would I set one up?

I’m currently attempting to set up my first 440 MHz machine. From all the research I’ve done I need two radios, a controller and a duplexer. I was going to go with a DR-1x. Is this correct? Would I ...
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1answer
233 views

How to program Kenwood TM-742A 6-meter repeater offsets for 500kHz

All the 6-meter repeaters in my area use a 500kHz offset, but the Kenwood TM-742A defaults to 1MHz offsets. Is there any way to make it easier to program the local repeaters into this radio?
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149 views

How to find repeaters in Pakistan? [closed]

How would I find a repeater in my area (Pakistan)? Are there any web resources? Can I use repeaters to listen only (using an SDR)?
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153 views

Why is repeater post-xmit “burst” stronger than repeated signal? [duplicate]

I have no problem triggering GB3LW, and after I release PTT I get the strong burst from the repeater confirming that it "heard me". But if I use two radios, the receive-only one will only hear that ...
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1answer
910 views

Blocking a specfic DMR ID

Is it possible to block a specific DMR ID Rx, sort of "ignore"? If so, is it repeater-based, or it has to be set locally, on radio? Speaking of popular md380/390 radios, there is a "Call Alert" ...