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Possible to modify radio freq. channels ?

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suriname

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Here's a hardcore electronics question...
Is it possible to modift gmrs radios to work on different frequencies then the ones they are programmed for ? e.g. the Unidens and such ?
Can these be re-programmed or flashed in any way, to have at least a few channels different ?

(p.s. before you all jump in my neck, this would not be used anywhere near USA)
 

KB7MIB

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Bubble-pack radios? I doubt it, at least not without expensive test equipment and a knowledgable tech to do it. And the laws in many other countries are harsher than the penalties for violating FCC regulations here. Just FYI.
 

suriname

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Bubble-pack radios? I doubt it, at least not without expensive test equipment and a knowledgable tech to do it. And the laws in many other countries are harsher than the penalties for violating FCC regulations here. Just FYI.
a good quality marine-radio

don't worry about laws, no dense population within a 100km from where I am. (no mobile/GSM either)
 

gewecke

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a good quality marine-radio

don't worry about laws, no dense population within a 100km from where I am. (no mobile/GSM either)
?? There's a big difference between GMRS and marine radios,they are on two totally different bands so which are you asking about?

73,
n9zas
 

suriname

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You are correct about the different bands. I had it mixed up when posting, your comment cleared my mixup.

As for the mod, let me rephrase the question: Can a Marine VHF radio be *re-tuned* to to TX/RX on non-Marine frequencies in the 2M (144-148) band ? Those are a bit more close by...

(I can find measure equipment and parts to have this done)

Tnx !
 

gewecke

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You are correct about the different bands. I had it mixed up when posting, your comment cleared my mixup.

As for the mod, let me rephrase the question: Can a Marine VHF radio be *re-tuned* to to TX/RX on non-Marine frequencies in the 2M (144-148) band ? Those are a bit more close by...

(I can find measure equipment and parts to have this done)

Tnx !
Uh....NO because a amateur radio license is required to transmit on the 2m band, and marine radios are not intended to tune that low in the first place.

73,
n9zas
 

suriname

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You did say no, but your because-statement was not valid for the question asked (license a non-issue where I am, far away from the USA).

As for the 2nd part of your *answer* where you say "not intended to tune that low in the first place":
IF it was intended, I would NOT be asking for a mod (aka modification, for something NOT intended in the first place). Duh.
 

RKG

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Your question cannot be answered generically. One has to know the details of the synthesizer design, how and where the synthesizer control is implemented, and whether the resonant components are broad enough to shift in the desired direction and amount.
 

suriname

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Your question cannot be answered generically. One has to know the details of the synthesizer design, how and where the synthesizer control is implemented, and whether the resonant components are broad enough to shift in the desired direction and amount.
There's a great answer ! I now know what to look for and find out if what you have said is possible to accomplish. Merci !
 

gewecke

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You did say no, but your because-statement was not valid for the question asked (license a non-issue where I am, far away from the USA).

As for the 2nd part of your *answer* where you say "not intended to tune that low in the first place":
IF it was intended, I would NOT be asking for a mod (aka modification, for something NOT intended in the first place). Duh.
D-uh, marine radios are manufactured by a whole list of companies that design them to be used specifically in the marine band ONLY, meaning they are not chop job friendly so again the answer is No. No matter where you are in the galaxy.

73,
n9zas
 

suriname

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Maybe.
But there would not be a "Pimp my car" if everyone would drive their car the way it was intended to, the way it came from the factory.
Mods make everything more interesting. Maybe not for you, but it does for others. Radio-Shack and Mouser are great sources for many of us, for the exact same reason there are aftermarket parts for cars (to do things they were NOT intended to do).
So unless you intend to contribute to the post, I kindly ask to please move along..
"Pimp my Marine-Radio" coming up after the break.
 
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gewecke

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Maybe.
But there would not be a "Pimp my car" if everyone would drive their car the way it was intended to, the way it came from the factory.
Mods make everything more interesting. Maybe not for you, but it does for others. Radio-Shack and Mouser are great sources for many of us, for the exact same reason there are aftermarket parts for cars (to do things they were NOT intended to do).
So unless you intend to contribute to the post, I kindly ask to please move along..
"Pimp my Marine-Radio" coming up after the break.
This isn't tv.
I'm guessing you're not a real quick study,otherwise you wouldn't be debating this with me so please let me know if you find any easily modifiable marine radios? I'm betting NO. They are designed NOT to be tinkered with in the first place but go ahead and trash one, obviously some just have to try regardless of the facts.

73,
n9zas
 

suriname

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This isn't tv.
I'm guessing you're not a real quick study,otherwise you wouldn't be debating this with me so please let me know if you find any easily modifiable marine radios? I'm betting NO. They are designed NOT to be tinkered with in the first place but go ahead and trash one, obviously some just have to try regardless of the facts.

73,
n9zas
They come quite inexpensive, and being a marine-radio, are also water/weather-proof.
Nothing is designed to be tinkered with. That must not slow you down.
I've seen many devices be modified to do things they were not designed to do.
Rules are not meant to be broken, but I do bend them quite a lot.
I will be trying it 4 sure, that you don't have to tell me.
 

RKG

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There's a great answer ! I now know what to look for and find out if what you have said is possible to accomplish. Merci !
True, in theory. In the real world, I wouldn't spend a lot of time on this. I'm reasonably certain that most marine radios have their synthesizer control logic hard coded (and therefore not possible to change). It would be much easier just to find a radio that was designed to operate on the channels of interest.
 

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It's hard coded into the processor. If you could intercept the pll lines with another controller then yes.
 

gewecke

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Now that would be some serious bench time...if you rewrote the pll or maybe find a sub from a design using the same series radio.

73,
n9zas
 
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