Assuming you're in the U.S., you need a copy of Part 15 of the FCC
rules, which deals with unlicensed transmitters among other things. I
imagine it's on the web these days -- if not, it's available from the
government printing office for a nominal charge.

Roy Lewallen, W7EL

stan wrote:
hello folks , hope someone can help me

i have built some 433MHz CW transmitters and used them for tracking
model airplanes and stuff so I can find them if they get lost , the
only ones i have built so far are only a couple of mW output , the
company make they low power modules say no license is required for
their use

ok , so now i want to build a higher power one for greater distance ,
thinking of using the linx modules which can either have 10mW or 50mW
output at 433MHz CW

my questions

1) as power increases at some point i will need to get a technician
class license , no problem as i will do that , but my question is at
what power level is this required ? can you point me to where this
is defined ?

2) i know building little transmitters for sale as a product requires
an FCC registration number ... but building only a couple for your own
use does not .. correct ? ( if so hams couldn't ever build their own
transmitters )

thanks for any assistance ... stan

And the US government will refer to it as "Part 15 of CFR 47" -- CFR 47
being volume 47 of the code of federal regulations. If you get if from the
gov'ment as a book it will come bound with other parts -- my 1992 set of CFR
47 has three volumes.

"Roy Lewallen" wrote in message
...
Assuming you're in the U.S., you need a copy of Part 15 of the FCC
rules, which deals with unlicensed transmitters among other things. I
imagine it's on the web these days -- if not, it's available from the
government printing office for a nominal charge.

Roy Lewallen, W7EL

stan wrote:
hello folks , hope someone can help me

i have built some 433MHz CW transmitters and used them for tracking
model airplanes and stuff so I can find them if they get lost , the
only ones i have built so far are only a couple of mW output , the
company make they low power modules say no license is required for
their use

ok , so now i want to build a higher power one for greater distance ,
thinking of using the linx modules which can either have 10mW or 50mW
output at 433MHz CW

my questions

1) as power increases at some point i will need to get a technician
class license , no problem as i will do that , but my question is at
what power level is this required ? can you point me to where this
is defined ?

2) i know building little transmitters for sale as a product requires
an FCC registration number ... but building only a couple for your own
use does not .. correct ? ( if so hams couldn't ever build their own
transmitters )

thanks for any assistance ... stan

In article , "Tim Wescott"
writes:

And the US government will refer to it as "Part 15 of CFR 47" -- CFR 47
being volume 47 of the code of federal regulations. If you get if from the
gov'ment as a book it will come bound with other parts -- my 1992 set of CFR
47 has three volumes.

Suggestion: Go to the FCC website and click the Office of Engineering
and Technology button (to the right). OET page will let you access
Part 15 rules directly instead of going to the Government Printing Office
site and doing small (free) downloads of any portion of Parts of the
Code of Federal Regulations.

My 1995 set of 47 C.F.R. was five volumes and cost $120. GPO has
branch offices in most of the larger cities of the USA. No shipping
charges. Individual volumes are available. Part 15 is still available
free over the Internet.

Len Anderson
retired (from regular hours) electronic engineer person

Roy,

It has been a while since I read it, but isn't the bulk of the requirement a
field strength number? I run a validation department and we measure field
strength for our products. If there is a section of part 15 which gets
specific (like I think the old 136 KHz part or the AM band where a power and
antenna IS specified, then he's ok. Otherwise he'll have to measure field
strength.

--
Steve N, K,9;d, c. i My email has no u's.

"Roy Lewallen" wrote in message
...
Assuming you're in the U.S., you need a copy of Part 15 of the FCC
rules, which deals with unlicensed transmitters among other things. I
imagine it's on the web these days -- if not, it's available from the
government printing office for a nominal charge.

Roy Lewallen, W7EL

stan wrote:
hello folks , hope someone can help me

i have built some 433MHz CW transmitters and used them for tracking
model airplanes and stuff so I can find them if they get lost , the
only ones i have built so far are only a couple of mW output , the
company make they low power modules say no license is required for
their use

ok , so now i want to build a higher power one for greater distance ,
thinking of using the linx modules which can either have 10mW or 50mW
output at 433MHz CW

my questions

1) as power increases at some point i will need to get a technician
class license , no problem as i will do that , but my question is at
what power level is this required ? can you point me to where this
is defined ?

2) i know building little transmitters for sale as a product requires
an FCC registration number ... but building only a couple for your own
use does not .. correct ? ( if so hams couldn't ever build their own
transmitters )

thanks for any assistance ... stan

Steve Nosko wrote:
Roy,

It has been a while since I read it, but isn't the bulk of the requirement a
field strength number? I run a validation department and we measure field
strength for our products. If there is a section of part 15 which gets
specific (like I think the old 136 KHz part or the AM band where a power and
antenna IS specified, then he's ok. Otherwise he'll have to measure field
strength.

Yes, virtually all the part 15 specifications are field strength.
However, if the power is known, the field strength can often be
approximated by modeling or by making some assumptions about antenna
gain and efficiency. Accurate measurement of field strength isn't trivial.

Roy Lewallen, W7EL

Steve Nosko wrote:
Roy,

It has been a while since I read it, but isn't the bulk of the requirement a
field strength number? I run a validation department and we measure field
strength for our products. If there is a section of part 15 which gets
specific (like I think the old 136 KHz part or the AM band where a power and
antenna IS specified, then he's ok. Otherwise he'll have to measure field
strength.

Yes, virtually all the part 15 specifications are field strength.
However, if the power is known, the field strength can often be
approximated by modeling or by making some assumptions about antenna
gain and efficiency. Accurate measurement of field strength isn't trivial.

Roy Lewallen, W7EL

Roy Lewallen wrote:
Assuming you're in the U.S., you need a copy of Part 15 of the FCC
rules, which deals with unlicensed transmitters among other things. I
imagine it's on the web these days -- if not, it's available from the
government printing office for a nominal charge.

http://wireless.fcc.gov/rules.html (which has links to all Parts of the
FCC rules.)
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

Roy Lewallen wrote:
Assuming you're in the U.S., you need a copy of Part 15 of the FCC
rules, which deals with unlicensed transmitters among other things. I
imagine it's on the web these days -- if not, it's available from the
government printing office for a nominal charge.

http://wireless.fcc.gov/rules.html (which has links to all Parts of the
FCC rules.)
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com