I did say dBm .....
On 9/02/2015 12:20 PM, Bruce Perens wrote:
On 02/08/2015 05:05 PM, glen english wrote:
A TX low pass filter is not shown- I assume that is in there - all
harmonics need to be below -30dBm , (preferably -36dBm if it is going
to connect to a vehicle antenna and run more than 5W)
You'll likely need TWO separate low pass filters for 2m/70cm operation.
We have more stringent requirements in the U.S.
(d) For transmitters installed after January 1, 2003, the mean
power of any spurious emission from a station transmitter or
external RF power amplifier transmitting on a frequency below 30
MHz must be at least 43 dB below the mean power of the fundamental
emission. For transmitters installed on or before January 1, 2003,
the mean power of any spurious emission from a station transmitter
or external RF power amplifier transmitting on a frequency below
30 MHz must not exceed 50 mW and must be at least 40 dB below the
mean power of the fundamental emission. For a transmitter of mean
power less than 5 W installed on or before January 1, 2003, the
attenuation must be at least 30 dB. A transmitter built before
April 15, 1977, or first marketed before January 1, 1978, is
exempt from this requirement.
(e) The mean power of any spurious emission from a station
transmitter or external RF power amplifier transmitting on a
frequency between 30–225 MHz must be at least 60 dB below the mean
power of the fundamental. For a transmitter having a mean power of
25 W or less, the mean power of any spurious emission supplied to
the antenna transmission line must not exceed 25 µW and must be at
least 40 dB below the mean power of the fundamental emission, but
need not be reduced below the power of 10 µW. A transmitter built
before April 15, 1977, or first marketed before January 1, 1978,
is exempt from this requirement.
Most national spurious specifications are derived from this, I think:
http://life.itu.int/radioclub/rr/ap03.htm
Thanks
Bruce
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Glen English
RF Communications and Electronics Engineer
CORTEX RF
&
Pacific Media Technologies Pty Ltd
ABN 40 075 532 008
PO Box 5231 Lyneham ACT 2602, Australia.
au mobile : +61 (0)418 975077
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