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'[EE] Re: Boosting power of radio modules[EE]'
2000\05\26@123625 by Dan Mulally

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Mini circuits have several easy to use amplifiers that can boost the output
to up to 30dBm (1Watt) depending on if linearity is desired. Your system is
probably FM so linearity is not needed or desired since linear amps are
inefficient. You need to check the FCC rules.

Dan Mulally

{Original Message removed}

2000\05\26@135344 by Harold M Hallikainen

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On Fri, 26 May 2000 10:24:59 -0600 Dan Mulally <spam_OUTdtconTakeThisOuTspamRAPIDNET.COM>
writes:
> Mini circuits have several easy to use amplifiers that can boost the
> output
> to up to 30dBm (1Watt) depending on if linearity is desired. Your
> system is
> probably FM so linearity is not needed or desired since linear amps
> are
> inefficient. You need to check the FCC rules.
>

       Assuming you are operating this as an FCC part 15 unlicensed intentional
radiator (and not some licensed transmitter, such as amateur), the
appropriate rules are in part 15.
       FCC Rules regarding unlicensed intetional radiators start at section
15.201. The table of contents with links to rules is available at
http://hallikainen.com/cgi-bin/section.pl?section=15 .
       In particular, note that 15.201requires such devices to be
"certificated" with the Commission. Adding power amplifiers, etc. would
violate this certification (the equipment is not the same that was
certificated).
       See also 15.204 which prohibits use of an antenna other than that
supplied with the transmitter on a part 15 intentional radiator.

Harold


FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

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2000\05\26@144015 by Dan Michaels

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Harold wrote:
.....
>        Assuming you are operating this as an FCC part 15 unlicensed
intentional
{Quote hidden}

....


If I read this correctly, Harold, you are saying that even an
"unlicensed" transmitter still "must" be certified.

<SECRET STUFF>
Shoot - in for a penny, in for a pound. I guess if someone does
this the "wrong" way, they might as well go "all the way" - and
break all the rules - overpowered, illegal antenna, non-certified,
what the heck. [did all you Echelon moles pick this up?].

Maybe we should have an [ECHELON] admin category to make
Echelon's job easier!!
</SECRET STUFF>

2000\05\26@153824 by Andrew Seddon

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I don`t think most of this applies to me as I am in the UK. Believe me if I
thought there was any chance of causing disruption to others I wouldn't`t
even consider it. I know the band I am transmitting on is set aside for
short range keyfob transmitters etc. BTW it is actually 418Mhz I am
transmitting on not 433 as I previously said.

> Harold wrote:
> .....
> >        Assuming you are operating this as an FCC part 15 unlicensed
> intentional
> >radiator (and not some licensed transmitter, such as amateur), the
> >appropriate rules are in part 15.
> >        FCC Rules regarding unlicensed intetional radiators start at
section
{Quote hidden}

2000\05\26@161439 by Harold M Hallikainen

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On Fri, 26 May 2000 12:38:23 -0600 Dan Michaels <.....oricomKILLspamspam@spam@LYNX.SNI.NET>
writes:
{Quote hidden}

       Yes, 15.201 pretty much requires that. However, 15.23 allows "home built
devices" as follows...

Sec. 15.23  Home-built devices.

   (a) Equipment authorization is not required for devices that are not
marketed, are not constructed from a kit, and are built in quantities of
five or less for personal use.
   (b) It is recognized that the individual builder of home-built
equipment may not possess the means to perform the measurements for
determining compliance with the regulations. In this case, the builder
is expected to employ good engineering practices to meet the specified
technical standards to the greatest extent practicable. The provisions
of Sec. 15.5 apply to this equipment.



       I don't believe that adding an unauthorized power amplifier or antenna
to a commercial device would make the resulting system "home built." I
believe that this section continues to require that users of home built
equipment comply with all the limits of part 15, but recognizes that a
typical person does not have the means to make the required measurements.


Harold



FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

________________________________________________________________
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2000\05\26@161442 by Harold M Hallikainen

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       Actually, I'd expect NONE of the US FCC rules to apply in the UK.
However, most countries have very similar rules on unlicensed
transmitters.

Harold


On Fri, 26 May 2000 08:34:23 +0100 Andrew Seddon <seddonaspamKILLspamHOTMAIL.COM>
writes:
{Quote hidden}

FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

________________________________________________________________
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Juno now offers FREE Internet Access!
Try it today - there's no risk!  For your FREE software, visit:
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2000\05\27@072730 by mike

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On 27 May 00, at 0:01, Automatic digest processor wrote:

> Date:    Fri, 26 May 2000 10:51:04 -0700
> From:    Harold M Hallikainen <.....haroldhallikainenKILLspamspam.....JUNO.COM>
> Subject: Re: [EE] Re:      Boosting power of radio modules[EE]
>
<<snip>>
>
>         Assuming you are operating this as an FCC part 15 unlicensed
> intentional
> radiator (and not some licensed transmitter, such as amateur), the
> appropriate rules are in part 15.
<< 'nother snip>>
>         See also 15.204 which prohibits use of an antenna other than
> that
> supplied with the transmitter on a part 15 intentional radiator.
>
> Harold
>
how do you do a smiley blowing a friendly rasberry?.

2000\05\29@151113 by andy howard

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> From: "Harold M Hallikainen" <EraseMEharoldhallikainenspam_OUTspamTakeThisOuTJUNO.COM>
> Subject: Re: [EE] Re: Boosting power of radio modules[EE]


> Actually, I'd expect NONE of the US FCC rules to apply in the UK.
> However, most countries have very similar rules on unlicensed
> transmitters.


Indeed, the rules are in effect pretty much the same. All devices must
be type-approved though, there's no home hobbyist exemption AFAIK. This
system is due to be scrapped in favour of "self-certification" of
compliance by manufacturers by next April.

I suspect that if Andrew S is fitting his device at the feedpoint of a
small Yagi (probably the best solution), he would not be complying with
the spirit of the type approval - and probably the letter of it too. On
the other hand, it looks like the federales have bigger fish to fry.

The relevant UK authority is the Radiocommunications Agency
http://www.radio.gov.uk/

There's a good detailed paper on "licence exempt" devices too.
http://www.radio.gov.uk/document/ra_info/ra114/ra114.htm  includes
references to all the relevant specification documents, which can be
researched from the front page.

Andy.


----------------------------------------

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