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GMRS / FRS Discussions related to GMRS (General Mobile Radio Service) and FRS (Family Radio Service) communications

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Old 06-23-2013, 11:12 PM
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Default FRS/GMRS and repeaters

Kind of new to FRS and GMRS so this may be a stupid question, but here goes anyway.....

Is there any way of knowing if what I'm hearing on the FRS and GMRS freqs is simplex or coming over a repeater?

There is an Enterprise Commercial Vehicle Sales business about 1/2 mile from me, and they use GMRS for communications between the office and their (huge) lot. Sometimes they come in with a booming signal and other times it's nothing but static. I guess I'm wondering if they are on a repeater and how I would know if they are.

Thanks in advance for any information provided.

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Old 06-23-2013, 11:23 PM
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If it is simplex, there is no "hang time" where the signal stays up after they have finished talking. If it is repeater, you should be able to hear them from a further distance, and most likely there will be hang time and possibly a squelch tail or courtesy tone after the transmission.
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Old 06-23-2013, 11:25 PM
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Usually if you're hearing a repeater there will be a delay before the signal drops on both ends, but not always. Is the signal clear from both parties? Do you hear a "chirp" at the end of their transmissions? What sort of range do they have?
If they are not giving a call sign, they are probably just another business using bubble pack radios illegally.

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Old 06-24-2013, 12:20 AM
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Wirelessly posted (Mozilla/5.0 (X11; Linux i686; U; en-US) Gecko/20081217 Vision-Browser/8.1 301x200 LG VN530)

We can't say if they're legal or not, without knowing what channel and make & model of radio they're using. An unmodified FRS-only radio on 1-14 is completely legal. An FRS/GMRS hybrid may be legal or not, depending on the channel they choose.
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Old 06-24-2013, 1:27 AM
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Quote:
Originally Posted by KB7MIB View Post
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We can't say if they're legal or not, without knowing what channel and make & model of radio they're using. An unmodified FRS-only radio on 1-14 is completely legal. An FRS/GMRS hybrid may be legal or not, depending on the channel they choose.
Exactly, since the op didn't specifically state the traffic was on GMRS or if a call was given. But I would not be surprised if they were illegal since I hear the same occur every day from the airport here.

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Old 06-24-2013, 7:27 AM
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Quote:
Originally Posted by SouthSideScannerGuy View Post
Kind of new to FRS and GMRS so this may be a stupid question, but here goes anyway.....

Is there any way of knowing if what I'm hearing on the FRS and GMRS freqs is simplex or coming over a repeater?

There is an Enterprise Commercial Vehicle Sales business about 1/2 mile from me, and they use GMRS for communications between the office and their (huge) lot. Sometimes they come in with a booming signal and other times it's nothing but static. I guess I'm wondering if they are on a repeater and how I would know if they are.

Thanks in advance for any information provided.

There are NO repeaters on FRS - it is not only not allowed but none of the normally sold FRS portable
radios has repeater capability.
....and has been said normally a GMRS repeater with a hang time is noticeable enough to make it
abundantly clear that it is a repeater.
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Old 06-24-2013, 8:44 AM
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Thanks for the replies. I really appreciate the information.

I really haven't heard a delay at the end of their transmissions nor any kind of chirp. I'll take note as to what frequency they're on when I hear them later on today. They're usually pretty quiet in the mornings; things don't pick up to mid-afternoon usually.

Once again, thanks for the info provided.

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Old 06-24-2013, 9:57 AM
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You could always program in both frequencies of each GMRS pair and give that a listen. You'll know right quick if it's a simplex conversation or a repeater.
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Old 06-24-2013, 10:53 AM
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Quote:
Originally Posted by SteveC0625 View Post
You could always program in both frequencies of each GMRS pair and give that a listen. You'll know right quick if it's a simplex conversation or a repeater.
Sometimes it's the simplest solutions you don't think of.

I just might do this. It'll only take a matter of minutes.

Thanks.

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Old 06-24-2013, 12:40 PM
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Well, after doing more listening, here's what I've discovered....

When I hear the business I referenced above, it's been while doing a "system search" of the FRS/GMRS/MURS bands on my scanner. Paid better attention when thy keyed up a little while ago, and saw that they were on 467.8500, not one of the normal FRS/GMRS frequencies. Turns out that that frequency is the Silver Star frequency. They're using a DPL tone, but reception is so spotty right now, my scanner isn't staying locked on long enough for me to notice what tone is being used.

I know someone replied that they may be on the air illegally, but maybe they are legit since they're using a business band frequency.

Anyway, just wanted to pass along this additional information just in case anyone else wants to comment. I certainly appreciate all the information provided; I have definitely learned a thing or two from this thread.

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Old 06-24-2013, 12:52 PM
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Good detective work. I would add that let's remember that some repeaters do not have any hang time, so that's not always the case.

Also, a little ear training goes a long way. If you are in a static position, and the signal of different "units" of theirs vary...odds are it's not a repeater. If the portables signals vary in quality, but the RF is solid on your end then that could be a repeater.

And, with the (real world) quality of some GMRS/FRS radios, and the wide nature of many scanners, you can often hear something on 462.700 that is really on 462.7125. I use 2 BC780 scanners, but one time had to program the GMRS and neighboring FRS freq in one of my Motorola radios to be able to tell for sure which they were on.

There is a rental place near where I work (but 20 mi from where I live) on 650 simplex. Not their fault, some Kenwood dealer sold them radios and put them on the freq....but I don't bother with them, as they are in a "hole" and work 8-5 so really they aren't bothering me, as I use other GMRS freqs. And....they are a "family" business...and could actually be ok to use GMRS...

Anyway...good ID!
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Old 06-24-2013, 4:03 PM
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Default My guess

Based on the info I can gather ( your location)
my best guess is that you are hearing a company
called FLEET MAINTENACE (sic)

By doing a search at
License Search - Advanced License Search
with the frequency and a better location, you should be able to
narrow it down ( if you really care)

There were 290 "hits" in Illinois.
most with 2 watt radios on 467.850

Good luck

Don
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Old 06-24-2013, 4:21 PM
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Fleet Maintenance aka Sears n Roebuck
Typically used 464.5250 Simplex 131.8 Hz

Many Groups use the Business Bubble packs and never license (Worse then GMRS Violators)

Many Department Stores as malls will use those frequencies and they actual license can be tricky to track down as it comes back to Corp HQ vs the actual Mall Locations.

To the OP what DPL ?? as many stores use the same tone/freq from store-to-store

Quote:
Originally Posted by k8zgw View Post
Based on the info I can gather ( your location)
my best guess is that you are hearing a company
called FLEET MAINTENACE (sic)

By doing a search at
License Search - Advanced License Search
with the frequency and a better location, you should be able to
narrow it down ( if you really care)

There were 290 "hits" in Illinois.
most with 2 watt radios on 467.850

Good luck

Don
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Last edited by ecps92; 06-24-2013 at 4:23 PM..
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Old 06-24-2013, 5:02 PM
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Default OK

Bill,
All I can tell you, is that you do a search 467.85
at the FCC site
License Search - Advanced License Search
License Search - Advanced License Search
and put in Illinois, you will get over 290 hits, about a dozen
of them are FLEET MAINTENACE ( that's the way it's spelled on the license)
they are also licensed on 464.525, but most of them seem to be expired.
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