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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17
votes
2answers
2k views

Why do repeaters use cavity filters?

Repeaters apparently often use large, expensive cavity filters to connect the receiver and transmitter to the same antenna. Why aren't typical electrical circuits, such as inductors and capacitors ...
15
votes
2answers
22k views

How do I make a RF propagation map for a repeater?

Let's say I have a repeater. Knowing all of the information about antenna height and gain in each direction, as well as power, how can I create a map similar to this map I saw of a repeater in ...
13
votes
4answers
3k views

OK to use any repeater?

There are a number of repeaters in my area, each belonging to a particular amateur radio club. These guys are all friendly and willing to chat but I was wondering if it was bad form to make use of a ...
12
votes
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) ...
10
votes
4answers
8k views

Operating proceedures: testing an HT against a repeater?

Assuming proper licensing for the frequency, what is the proper operating procedure to test whether an HT works and is within range of a (documented as open, 2M or 440) club repeater? Should one wait ...
10
votes
1answer
1k views

Fastest Speed allowed for CW FM repeater ID in USA

What is the fastest legal WPM I can use for my repeater's Morse code identification? I am in the USA.
9
votes
5answers
5k views

Is it illegal to key up and not identify?

So, I key up on a repeater to see if it works, or to see what cool courtesy tone they are using. I don't do anything else. Is it illegal or bad ham radio etiquette to just key up for a second, key ...
9
votes
3answers
803 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 ...
9
votes
1answer
352 views

Advantage of 6 meter repeaters

6 meters seems to be a place where when the conditions are right, repeaters may interfere with each other from far distances, but when the conditions are normal, repeaters are similar to 2 meters. ...
9
votes
4answers
11k views

Building a portable event repeater

How does one go about building a portable repeater for use at events? Preferably at low cost, and with a minimum of bulky parts (so it's travel friendly). Obviously you'd need a pair of radios to ...
8
votes
1answer
334 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 ...
8
votes
3answers
284 views

How do club codes stay secret?

To use auto patch, IRLP or other special repeaters, you need the club code from the local club I am part of, which is a DTMF code. But I was thinking, DTMF can't be very hard to decode, and if ...
8
votes
1answer
184 views

Identifying regulations for interfering stations

I'm working on tracking down some 2m repeater interference, and I have identified that the offending signal is a spur transmission on a commercial pager service (that lands right on our repeater input ...
7
votes
3answers
416 views

Why don't I hear the CTCSS tones when listening on the repeater input frequency?

I am newly licensed (Technician) and bought a UV-5RA as a cheap way to check out what's going on in my area and see if I'm finding it interesting enough to get a better UHF/VHF HT. The other day I was ...
7
votes
3answers
225 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 ...
6
votes
8answers
6k views

VHF/UHF digital single-frequency repeater without duplexers?

Some digital voice protocols are time slotted (TDMA), i.e. the transmitter of a station is not on all the time, and multiple stations may transmit digital voice on the same frequency at the same time ...
6
votes
3answers
374 views

What is the reason/origin of conventional US repeater offsets?

In the US, the common (though not universal) repeater offsets are ±600 kHz in the 2m band and ±5 MHz in the 70cm band. How and why did these offsets come to be standard for amateur repeaters? The ...
6
votes
5answers
11k views

Wifi passive repeater (antenna to antenna connection)

I have two buildings. Building A has wifi (2.4GHz) infrastructure, Building B doesn't. One side of building B can pick up the wifi signal from building A. I want to passively extend the signal through ...
6
votes
2answers
5k views

“Repeater” vs. “reflector”

In various topics on repeaters, IRLP, D-Star and EchoLink, I see people refer to these 'nodes' (for lack of a better word) as reflectors. A quick Internet search for these terms comes up with all ...
6
votes
1answer
697 views

Is it legal to use an R identifier for my repeater in the USA?

I have been told by someone that my repeater is not allowed to have a slash r on the end of transmission because that is an identifier for the Russian Federation. Almost every repeater locally uses ...
6
votes
3answers
4k views

Is it possible to have 2 FM transmitters on the same frequency?

Has there been any success in transmitting two simultaneous FM signals? I am assuming if the phase is correct, and the signals are identical, it would be possible. That would be really nice if newer ...
6
votes
2answers
3k views

What are the default repeater offsets on 70cm in different countries? [closed]

I am looking for a reference list of the default repeater offsets by frequency and country on the 70cm band, to supply it into a radio control software. Most radios come with a list built-in, but the ...
5
votes
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?...
5
votes
3answers
1k 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 ...
5
votes
1answer
148 views

How would I go about setting up my own repeater in the UK?

How would I go about setting up my own repeater in the UK? For instance, what license category would I need, what equipment would should be looking to purchase, and do I have to register it anywhere?
5
votes
1answer
4k views

How to access a P25 repeater?

Are there any special instructions for accessing a P25 repeater? What makes it different from a CTCSS/PL-tone-encoded repeater? What special features does a radio need to access it?
4
votes
2answers
209 views

If repeaters share the same call sign are they “Connected”

Newbe here, I was looking through repeaters in my area and I noticed that there were a few repeaters that shared the same call sign(even though they run on different frequencies). Does this mean that ...
4
votes
2answers
922 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 ...
4
votes
3answers
223 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 ...
4
votes
3answers
675 views

Bridging LAN over ~1-2km distance

A friend of mine and I live across a lake from each other, and recently we thought it'd be fun to try and connect our computers together somehow across that distance. Running cable from either side ...
4
votes
3answers
3k 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 ...
4
votes
1answer
255 views

How do repeaters work? (The technical side)

I'm curious how AM and FM repeaters work. Is the received signal demodulated and then remodulated at the new frequency or do they use some other technique?
4
votes
3answers
679 views

Is it legal to use animal noise courtesy beep?

For Thanksgiving, I changed the courtesy beep to a turkey noise on my repeater/node. Some other people did it so I thought it was fine. Someone however told me that it did not follow part 97 FCC. Is ...
4
votes
1answer
211 views

How can we determine what repeaters to use?

My wife and I are studying for our Technician class licenses. We are thinking about how we could communicate with each other while both of us are at work, she being in Oakland, CA and myself in ...
4
votes
1answer
415 views

What am I responsible for on my link?

I have set up an AllStar link system to a repeater depicted in the picture below: The repeater is under NØMHU's call, and my node is under me, KDØWHB. With permission, I service EchoLink and AllStar ...
4
votes
1answer
744 views

Repeater autopatch (“phone patch”): which countries use this?

The section Operating Your Ham Radio in an Emergency from Ham Radio For Dummies recommends using an "emergency autopatch" to reach the emergency services when reporting an emergency from an amateur ...
3
votes
5answers
365 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 ...
3
votes
6answers
2k views

Would it be feasible to set up a SSB or AM 2 meter repeater?

Would it be feasible to set up a SSB or AM 2 meter repeater? I want to set up an AllStar full duplex node and like the idea of AM because stations can double without issues. SSB works for weaker ...
3
votes
5answers
2k views

Does the ICOM ID-51A's repeater search work with non-D-STAR repeaters?

Has anyone tested the new ICOM ID-51A Plus with regular repeaters (i.e. analog)? I'm looking to quickly find the nearest repeater (and sign on with a PL code!) with like 1 or 2 clicks. Is that ...
3
votes
4answers
286 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 ...
3
votes
4answers
464 views

Are directional couplers ever used in duplex repeater systems?

I understand that most single-band repeaters will use a tuned cavity duplexer to isolate the received signal from the transmitted signal, since the frequencies are very close and extremely sharp ...
3
votes
1answer
230 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 ...
3
votes
1answer
333 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 ...
3
votes
1answer
165 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 ...
3
votes
1answer
159 views

After I call out “Monitering” how long should I wait until I switch frequency?

Sometimes, when I am trying to make contacts, I call out on a bunch of repeaters due to low activity on individual repeaters. I usually call out, wait 10 seconds, then change repeater. Is there a ...
3
votes
3answers
1k views

SSTV on repeaters?

Just a simple question and the answer is probably no, but am I allowed to transmit a picture using SSTV on an FM 2 meter or 70 centimeter repeater? I am in the United States.
3
votes
3answers
286 views

Am I allowed to transmit on one repeater and receive on another?

Lets say 2 people can receive on 2 repeaters equally, but one hits a repeater transmitting better and the other person hits the other repeater better. Am I allowed to transmit on one repeater, and ...
3
votes
2answers
579 views

70cm antenna for an apartment

I have a blind friend who can't put anything outside, and is restricted to antennas near the window in his apartment. Luckily he lives closer to the top, which helps with range a little bit. He has a ...
3
votes
2answers
419 views

Is it possible to radio between America and India?

My friend and I want to see if we can Ham radio between San Jose, CA and Bangalore, India. We're beginners and are going to be using handheld radios. Are there any networks of repeaters, that could ...
3
votes
5answers
1k views

How do I get a coordinated frequency assigned for my repeater?

I am thinking about putting up a 70cm repeater up on my High School, where they have a very tall roof. By the time It is ready to put it up, I want to make sure a frequency is reserved for the ...