frs/murs cross band link? legal?

WQFM513 · May 11, 2011

what would be the legality of cross band repeating frs to murs and murs to frs, which would allow frs users to communicate with murs users and murs users to communicate with frs users. it would require one radio for each band, type accepted, patch cable for mic/audio to link both radios, and vox function on both radios.
both services are license free, and say no repeaters. what if i called it a cross band link, not a repeater?
any thoughts? no plans to build such a thing, just curious.

JASII · May 11, 2011

FRS/MURS Cross Band Link? Legal?

No, it is not legal.

WQFM513 · May 11, 2011

why not? both bands are license free, and you wouldn't be transmitting over the legal wattage for the band your radio is in.

n5ims · May 11, 2011

WQFM513 said:
both services are license free, and say no repeaters. what if i called it a cross band link, not a repeater?
any thoughts? no plans to build such a thing, just curious.

It really doesn't matter what you call it, a repeater is illegal on those bands. Trying to argue legality by simply changing the name would be like telling the judge and jury that "I didn't really rob that bank, it was just got an intrest free loan that the bank said I didn't have to pay back. After all, your honor, banks all of the time make loans with different terms and at times let folks declare bankrupcy and not pay them back. I just did that process in a single transaction and the bank appeared glad to have me walk out with the money!"

gewecke · May 11, 2011

WQFM513 said:
why not? both bands are license free, and you wouldn't be transmitting over the legal wattage for the band your radio is in.

NEITHER band allows cross band privledges! Is this simple enough for you.
There is no gray area here.

n9zas

n5ims · May 11, 2011

WQFM513 said:
why not? both bands are license free, and you wouldn't be transmitting over the legal wattage for the band your radio is in.

Well, for one, the FCC specifically prohibits repeaters on MURS.

Sec. 95.1311 Repeater operations and signal boosters prohibited.

MURS stations are prohibited from operating as a repeater station or
as a signal booster. This prohibition includes store-and-forward packet
operation.

For another, you are prohibited from attaching anything to an FRS radio that is not FCC Certified as part of that FRS radio so this would make it hard to attach a MURS radio to it to allow this repeat function (err. "cross-band link") to work.

Sec. 95.194 (FRS Rule 4) FRS units.

(a) You may only use an FCC certified FRS unit. (You can identify an
FCC certified FRS unit by the label placed on it by the manufacturer.)
(b) You must not make, or have made, any internal modification to an
FRS unit. Any internal modification cancels the FCC certification and
voids your authority to operate the unit in the FRS.
(c) You may not attach any antenna, power amplifier, or other
apparatus to an FRS unit that has not been FCC certified as part of that
FRS unit. There are no exceptions to this rule and attaching any such
apparatus to a FRS unit cancels the FCC certification and voids
everyone's authority to operate the unit in the FRS.
(d) FRS units are prohibited from transmitting data in store-and-
forward packet operation mode.

WQFM513 · May 12, 2011

(Sec. 95.1311)(Sec. 95.194 (FRS Rule 4) FRS units.) this is what im looking for, just saying no no doesnt do s***, my kids proved that one to me. Reason for or why. now that i have an official fcc rule to see, now i know why i cant do it. thanks n5ims for the secs.

DaveNF2G · May 12, 2011

As a rule of thumb, the FCC does not permit crosspatching between different radio services.

Hams can crossband because the frequencies are all in the amateur service. MURS and FRS/GMRS are different services entirely.

roadranger · Jun 21, 2011

I am not so sure...

...why you would wan to do that. There wold be little range gain, say to the MURS users, which I am sre that was designed to be a short range, unlicensed service. Imagine not having to cover much distance, for instance in a box store. Main user unnamed, for topic's sake, uses and has used it to cover each store since before being grandfathered in. Anyway, the service is great in most buildings, even up or down a few floors. The service was really meant for short range comms, no matter how many of us do the distance records. Neat Idea, yet many has covered the "why not?" GMRS repeaters seem to be enough. I might get a license yet.

Murstech · Jul 25, 2011

No its not legal but.. Guess what Im building?
Its a 25 watt uniden marine radio I have modified to use on MURS. I am using a small FRS walkie talkie to connect to it and making a control board that will act just like the mobile extenders the California Police use.

So.. Right now I get about 8-12 miles on MURS between base and mobile both running 25 watts. What Im going to be able to do is flip a switch in my car to activate the extender. Then when Im in the grocery store I can use a small FRS walkie talkie to talk back to home base!

Since all of this is basically illegal I might as well add a connector to the FRS radio in the car to extend the range. In fact this is all going to be mounted inside a project box and Im going to use a homemade remote control box mounted to my dash.

ThomasMcKean · Jun 12, 2012

Murstech said:
No its not legal but.. Guess what Im building?
Its a 25 watt uniden marine radio I have modified to use on MURS. I am using a small FRS walkie talkie to connect to it and making a control board that will act just like the mobile extenders the California Police use.

So.. Right now I get about 8-12 miles on MURS between base and mobile both running 25 watts. What Im going to be able to do is flip a switch in my car to activate the extender. Then when Im in the grocery store I can use a small FRS walkie talkie to talk back to home base!

Since all of this is basically illegal I might as well add a connector to the FRS radio in the car to extend the range. In fact this is all going to be mounted inside a project box and Im going to use a homemade remote control box mounted to my dash.

We'll be checking the papers to see how many thousands of dollars you will owe in fines.

krokus · Jun 13, 2012

ThomasMcKean said:
We'll be checking the papers to see how many thousands of dollars you will owe in fines.

Plus confiscation of the car...

jhooten · Jun 13, 2012

I've said it before and I'll say it again. Doing it is one thing. Knowing it is illegal and going on an public website and bragging about it is foolish.

How about you post a vid on youtube so the feds have even more evidence? It worked for the toilet bomber.

KC4RAF · Jun 13, 2012

You guys are right Jerry.

But you gotta remember that the end results are a form of intertainment for us to read about some body doing something illegal, posting on facebook, youtube or whatever and getting busted. There's lots of times I said to myself, "what a dumba#@"! lol (Not referring to any person on this thread, so please don't take offense.)

BJ_NORTON · Jun 14, 2012

Murstech said:
No its not legal but.. Guess what Im building?
Its a 25 watt uniden marine radio I have modified to use on MURS. I am using a small FRS walkie talkie to connect to it and making a control board that will act just like the mobile extenders the California Police use.

So.. Right now I get about 8-12 miles on MURS between base and mobile both running 25 watts. What Im going to be able to do is flip a switch in my car to activate the extender. Then when Im in the grocery store I can use a small FRS walkie talkie to talk back to home base!

Since all of this is basically illegal I might as well add a connector to the FRS radio in the car to extend the range. In fact this is all going to be mounted inside a project box and Im going to use a homemade remote control box mounted to my dash.

If you're going the illegal route, may as well just buy a couple 40 watt maxtracs and program them up on FRS... sure would be a lot simpler way to increase the range :roll:

70cutlass442 · Jun 20, 2012

let be real people. No one will ever notice the cross band is there, and if someone does, he will get a letter.

SCPD · Jun 20, 2012

70cutlass442 said:
let be real people. No one will ever notice the cross band is there, and if someone does, he will get a letter.

Keep thinking that..............

gewecke · Jun 21, 2012

70cutlass442 said:
let be real people. No one will ever notice the cross band is there, and if someone does, he will get a letter.

Oh yes we would,lol! Do you think we would not notice the delay after each transmission? Or the person listening on the alternate band noticing your delay?
You can't b.s. a b.s'er! :wink:

73,
n9zas

SCPD · Jun 21, 2012

gewecke said:
Oh yes we would,lol! Do you think we would not notice the delay after each transmission? Or the person listening on the alternate band noticing your delay?
You can't b.s. a b.s'er! :wink:

73,
n9zas

Very true and some folks make it a point to make it their business....

KB7MIB · Jun 21, 2012

Wirelessly posted (Mozilla/5.0 (X11; Linux i686; U; en-US) Gecko/20081217 Vision-Browser/8.1 301x200 LG VN530)

Not to mention hobbyists who monitor both bands, and would hear the obvious link if they're within range of it.

frs/murs cross band link? legal?

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