Liam Ness <working@the.factory> wrote in article
<7flpnvs0lgoinsb1qua09ob5b6ip643n1s@4ax.com>:
> On Fri, 03 Oct 2003 01:17:32 GMT, James Knott <bit_bucket@rogers.com>
> wrote:
>
> >Liam Ness wrote:
> >
> >> I'd be very interested in what you are basing your statement that it
> >> would be illegal to use a 3 watt range rf amp. There definately are
> >> regulations on how much power you can transmit on at the cellular
> >> frequencies, but I believe 3 watts is alright as it has been done in
> >> the past by the cell phone manufacters.
> >>
> >
> >Except for low power (part 15 of FCC regs in U.S.) or amateurs building
> >their own equipment, you cannot legally use any home made transmitting
> >equipment or amplifiers. Such equipment must be certified by the relevant
> >government agency in your country. You can certainly buy a certified amp
> >and use it, but you'd have a big job to get your own device certified.
> >
> >Check with the FCC in U.S., Industry Canada in Canada etc., for regulations.
>
> Well, that is exactly it isn't it? I am an amateur building my own
> equipment. Everything I've done so far, and that I intend to do
> should be covered under section 15.23. Since it will be a home built
> device, I'm not subject to certification, a declaration of conformity,
> or verification. I guess that wasn't clear?
>
>
> There are a very few frequencies that are totally off limits under
> part 15, but not the cellular frequencies. There are some absolute
> limits to power output which vary by frequency, which is what I
> thought that you were basing your statement that 3 watts would be
> illegal, but there are certain protections to even those limits for
> home built devices. The FCC doesn't expect me to have access to the
> type of equipement necessary to measure my output (whether for power,
> harmonics, distortion, etc.). And, from my reading of section 15.23
> and 15.5 [particularly 15.5(c)], even if I totally screw up and home
> build a really noisy amp, I have not done anything unlawful.
>
> If you think otherwise and can point me to the specific law and/or
> regulation that leads you to your conclusion, I'd appreciate it. If
> you know the specific absolute part 15 power limits for the 800 and
> 1900 cellular frequencies in watts (I have no way to determine field
> strenght in microvolts/meter), I'd appreciate that, too.
>
> If not, I'd appreciate it even more if you or anyone else can
>
> "point me to a source for circuit/schematic information on a
> cellular rf amplifier? Preferrably something in the 3 watt range and
> broad enough to handle 800Mhz & 1900Mhz."
>

Hams have authority to operate in 900 MHz as you probably know. Why
don't you experiment there and not take the chance of interfering with
the cellular/PCS band. Hams do not have privileges in the 800 & 1.9GHz
spectrum, why do you want to put your license in jeopardy?

Mark

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