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Copyright: 1996 - 2024
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    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Digital Spread Spetrum Phone Mod? - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. If the folks at phpBB would release a version with integrated sign-in from the major social media platforms, I would resurrect the RF Cafe Forums, but until then it is probably not worth the effort. Regardless, there are still lots of great posts in the archive that ware worth looking at.

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Platonic
Post subject: Digital Spread Spetrum Phone Mod?
Unread postPosted: Mon Mar 28, 2005 7:20 pm
Offline
Lieutenant

Joined: Mon Mar 28, 2005 7:12 pm
Posts: 4
I've got two 900 MHz DSS (Freq. Hopping) cordless phones that I want to turn into short range radios. What I'd like to do is mod each one to put out at least 5 watts. The base of each phone would function as the transmitter while the paired handset would be the receiver.


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Platonic
Post subject:
Unread postPosted: Wed Mar 30, 2005 12:11 am
Offline
Lieutenant

Joined: Mon Mar 28, 2005 7:12 pm
Posts: 4
I think I need to ask a more specific question: Whar parts need to be replaced on the board to up the power to 5W? Where can I get a schematic for it or to modify it?


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Reality
Post subject:
Unread postPosted: Wed Mar 30, 2005 8:47 am

I hate to throw cold water on your idea here, but you do realize that the modification you are proposing is illegal per FCC rules, right? The cordless phone operate under FCC Part 15 unlicensed radiator regulations.


:(


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Guest
Post subject:
Unread postPosted: Wed Mar 30, 2005 4:25 pm

Reality wrote:
I hate to throw cold water on your idea here, but you do realize that the modification you are proposing is illegal per FCC rules, right? The cordless phone operate under FCC Part 15 unlicensed radiator regulations.


:(


Even if I'm a licensed amateur radio operator and the phone is going to be used in the 902-928 MHz range only?


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kpainter
Post subject:
Unread postPosted: Wed Mar 30, 2005 6:03 pm
Offline
Colonel
User avatar

Joined: Wed Aug 20, 2003 11:47 am
Posts: 47
Location: Santa Barbara, CA
Anonymous wrote:
Reality wrote:
I hate to throw cold water on your idea here, but you do realize that the modification you are proposing is illegal per FCC rules, right? The cordless phone operate under FCC Part 15 unlicensed radiator regulations.


:(


Even if I'm a licensed amateur radio operator and the phone is going to be used in the 902-928 MHz range only?


Yep, even if...


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Guest
Post subject:
Unread postPosted: Wed Mar 30, 2005 9:49 pm

Hummm, well I can build and operate experimental ham equipment of any kind as long as it doesn't interfere with other services so I don't understand how Part 15 devices are different. Just because they're certified by the FCC it makes them unmodifiable under any circumstances?


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Platonic
Post subject:
Unread postPosted: Wed Mar 30, 2005 9:52 pm
Offline
Lieutenant

Joined: Mon Mar 28, 2005 7:12 pm
Posts: 4
That was me I forgot to sign on!


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Guest
Post subject:
Unread postPosted: Wed Mar 30, 2005 10:47 pm

I take back what I said earlier. I shouldn't have originally phrased my response in a form of a question. Because as an amateur radio operator I should know that it's perfectly legal to do so. I was trying to be polite, but you took that to thinking that I'm bluffing. You forgot to take into consideration that I might be a new ham and I'm not aware of all these little laws and what not. The last thing we all need is another guy operating an RF transmitter illegally, I agree. But they're other ways to help people out than to lie to them about the legality of modding something just to brush them off because you think they were born yesterday.


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kpainter
Post subject:
Unread postPosted: Thu Mar 31, 2005 12:51 pm
Offline
Colonel
User avatar

Joined: Wed Aug 20, 2003 11:47 am
Posts: 47
Location: Santa Barbara, CA
Anonymous wrote:
I take back what I said earlier. I shouldn't have originally phrased my response in a form of a question. Because as an amateur radio operator I should know that it's perfectly legal to do so. I was trying to be polite, but you took that to thinking that I'm bluffing. You forgot to take into consideration that I might be a new ham and I'm not aware of all these little laws and what not. The last thing we all need is another guy operating an RF transmitter illegally, I agree. But they're other ways to help people out than to lie to them about the legality of modding something just to brush them off because you think they were born yesterday.


You make absolutely no sense. If you mod a phone to pound out 5 Watts in a band THAT IS REGULATED by Part 15, HOW are you going to know if you are or are not interferring with some one else? You are moving the burden of proof to the person you would be interferring with. The laws are in place specifically to cover people like you. But see, hams are not covered by FCC regulations, right?


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Guest
Post subject:
Unread postPosted: Thu Mar 31, 2005 3:49 pm

According to the HAM radio operators they can transmitt in any band. Let them try and transmit in the commercial FM and AM radio band and see how long it would take before someone comes knocking on their door. The existing cordless phones have low power for reason, NOT TO INTERFERE WITH YOUR NEIGHBOR.


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Guest
Post subject:
Unread postPosted: Thu Mar 31, 2005 3:53 pm

The last two posts make absolutely no sense.


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Guest
Post subject:
Unread postPosted: Thu Mar 31, 2005 3:55 pm

kpainter wrote:
Anonymous wrote:
I take back what I said earlier. I shouldn't have originally phrased my response in a form of a question. Because as an amateur radio operator I should know that it's perfectly legal to do so. I was trying to be polite, but you took that to thinking that I'm bluffing. You forgot to take into consideration that I might be a new ham and I'm not aware of all these little laws and what not. The last thing we all need is another guy operating an RF transmitter illegally, I agree. But they're other ways to help people out than to lie to them about the legality of modding something just to brush them off because you think they were born yesterday.


You make absolutely no sense. If you mod a phone to pound out 5 Watts in a band THAT IS REGULATED by Part 15, HOW are you going to know if you are or are not interferring with some one else? You are moving the burden of proof to the person you would be interferring with. The laws are in place specifically to cover people like you. But see, hams are not covered by FCC regulations, right?



It's regulated by part 15, but it's also regulated by part 97. In a ham's case it supercedes part 15. It's a shared band, remember?


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Guest
Post subject:
Unread postPosted: Thu Mar 31, 2005 3:57 pm

Anonymous wrote:
kpainter wrote:
Anonymous wrote:
I take back what I said earlier. I shouldn't have originally phrased my response in a form of a question. Because as an amateur radio operator I should know that it's perfectly legal to do so. I was trying to be polite, but you took that to thinking that I'm bluffing. You forgot to take into consideration that I might be a new ham and I'm not aware of all these little laws and what not. The last thing we all need is another guy operating an RF transmitter illegally, I agree. But they're other ways to help people out than to lie to them about the legality of modding something just to brush them off because you think they were born yesterday.


You make absolutely no sense. If you mod a phone to pound out 5 Watts in a band THAT IS REGULATED by Part 15, HOW are you going to know if you are or are not interferring with some one else? You are moving the burden of proof to the person you would be interferring with. The laws are in place specifically to cover people like you. But see, hams are not covered by FCC regulations, right?



It's regulated by part 15, but it's also regulated by part 97. In a ham's case it supercedes part 15. It's a shared band, remember?


Someone can buy you clue if you can't afford one!


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Guest
Post subject:
Unread postPosted: Thu Mar 31, 2005 3:58 pm

Anonymous wrote:
Anonymous wrote:
kpainter wrote:
Anonymous wrote:
I take back what I said earlier. I shouldn't have originally phrased my response in a form of a question. Because as an amateur radio operator I should know that it's perfectly legal to do so. I was trying to be polite, but you took that to thinking that I'm bluffing. You forgot to take into consideration that I might be a new ham and I'm not aware of all these little laws and what not. The last thing we all need is another guy operating an RF transmitter illegally, I agree. But they're other ways to help people out than to lie to them about the legality of modding something just to brush them off because you think they were born yesterday.


You make absolutely no sense. If you mod a phone to pound out 5 Watts in a band THAT IS REGULATED by Part 15, HOW are you going to know if you are or are not interferring with some one else? You are moving the burden of proof to the person you would be interferring with. The laws are in place specifically to cover people like you. But see, hams are not covered by FCC regulations, right?



It's regulated by part 15, but it's also regulated by part 97. In a ham's case it supercedes part 15. It's a shared band, remember?


Someone can buy you clue if you can't afford one!


Double posts are nasty. I quoted myself in the last post.


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Kirt Blattenberger
Post subject:
Unread postPosted: Thu Mar 31, 2005 4:55 pm
Offline
Site Admin
User avatar

Joined: Sun Aug 03, 2003 2:02 pm
Posts: 308
Location: Erie, PA
I am no expert on the FCC, but I do believe the original poster is correct that HAM operators operating under Part 97 rules do trumph Part 15 unlicensed operators. Although malicious intentional interference could probably be prosecuted, there are multitudes of articles on the ARRL website and all over the Internet that discuss this issue. Here is a useful one to consider:

http://www.qrpis.org/~k3ng/ham_wisp.html

The tone of the thread could have gone in a more amicable direction if the original poster had stated up front that he is a HAM.


- Kirt Blattenberger :smt024


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kpainter
Post subject:
Unread postPosted: Thu Mar 31, 2005 8:44 pm
Offline
Colonel
User avatar

Joined: Wed Aug 20, 2003 11:47 am
Posts: 47
Location: Santa Barbara, CA
It would appear that the Ham operator's use of the spectrum does indeed superceed the public's use of part 15 devices. I particularly enjoyed the suggestion of what to do if you run into an amatuer radio operator who is jamming your cordless phone:

"Q: How can I avoid problems with Amateurs in my area ?
...

Hams love free Internet service and surplus gear, working or not. Use these tools when dealing with interference issues with hams.

"

Nice. :roll: I didn't know that bridery was an ARRL accepted method of conflict resolution - I guess so.


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Platonic
Post subject:
Unread postPosted: Fri Apr 01, 2005 10:52 pm
Offline
Lieutenant

Joined: Mon Mar 28, 2005 7:12 pm
Posts: 4
Kirt Blattenberger wrote:
I am no expert on the FCC, but I do believe the original poster is correct that HAM operators operating under Part 97 rules do trumph Part 15 unlicensed operators. Although malicious intentional interference could probably be prosecuted, there are multitudes of articles on the ARRL website and all over the Internet that discuss this issue. Here is a useful one to consider:

http://www.qrpis.org/~k3ng/ham_wisp.html

The tone of the thread could have gone in a more amicable direction if the original poster had stated up front that he is a HAM.


- Kirt Blattenberger :smt024



You're right about the tone of the thread. But, I was under the impression that people on these forums were here to trade technical information only. I'll be sure to state the fact I'm licensed when it warrants doing so.



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