[Lowfer] Oh, CRAP!

[KD7JYK DM09]

Check THIS out:

New Radio Frequency Found

This is pretty cool for those of you who might like a higher frequency
sideband channel to talk on, maybe use sometimes as a AM broadcast
channel.

Section (§) 15.225 Operation within the band 13.110 - 14.010 MHz.

"(a) The field strength of any emissions within the band 13.553-13.567
MHz shall not exceed 15,848 microvolts/meter at 30 meters."

(b) Within the bands 13.410-13.553 MHz and 13.567-13.710 MHz, the
field strength of any emissions shall not exceed 334 microvolts/meter
at 30 meters.

(c) Within the bands 13.110-13.410 MHz and 13.710-14.010 MHz the field
strength of any emissions shall not exceed 106 microvolts/meter at 30
meters.

(d) The field strength of any emissions appearing outside of the
13.110-14.010 MHz band shall not exceed the general radiated emission
limits in § 15.209.

Ok, this is how it breaks down:

13.553-13.567 MHz could be a nice place to go and talk on SSB?  Using
a vertical or dipole antenna.  Maybe someone would do a broadcast
there.  It is not a bad frequency in the daytime.

  I think a CB radio is rated at 10,000 uV/3 m.  So, 15,848 uV/30 m is
a way higher power level than the CB I think.  Got to re check Part 15
to be sure?  That power level at a measurement of 30 meters is high.

Compare to the CB band:  in Part 15;

Section (§) 15.227 Operation within the band 26.96 - 27.28 MHz.

(a) The field strength of any emission within this band shall not
exceed 10,000 microvolts/meter at 3 meters. The emission limit in this
paragraph is based on measurement instrumentation employing an average
detector. The provisions in Section 15.35 for limiting peak emissions
apply.

Ok now see?  I got the stuff to backwards engineer the input power to
the antenna based upon the above 15,848 uV/30 m.  But I would have to
do a PC search here to locate my notes and equations.  Field strength
equations.

(Little off topic note: if any of you know someone who makes printed
circuit boards.  I am interested in making kits.  But we do not have
to hurry and rush it up.  I still have some files to run and tweak on
the designs.  But will be looking for a partner to collaborate with.
I write help text also for the builders and so, this can help the
partner to understand the kit and it's use.  If you know someone, just
drop me a line at my message box.  I use LTspice software as my design
software and all of my circuits have LTspice analysis files with them.)


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