>
> > of the Long Wave Club of America: www.lcwa.org
>
> I think you ment: www.lwca.org
>
> Unless you work for Lake County for your day job. ;-)
>
> don
>
>
>
Reply by Donald H●January 14, 20112011-01-14
> of the Long Wave Club of America: www.lcwa.org
I think you ment: www.lwca.org
Unless you work for Lake County for your day job. ;-)
don
Reply by Mike Staines●January 13, 20112011-01-13
>> Appendix E, starting page 91, for "Wireless Audio
Devices?"
Thanks, Jon.
Fortunately, we do not send audio (generally). And The frequencies we use
are not part of that Report and Order.
This was the (infamous, to some) Report and Order from the FCC that removed
Wireless microphones off of frequencies that the FCC wants to use for
broadband. Many organizations (particularly church groups) were left with
suddenly illegal wireless microphones.
To relate this to my MSP430 project: I will be using the MSP430 to generate
a signal in the 160-190 KHz range. A timer will also key the signal on and
off as Morse code. The toggled output pin will connect to a Class-D
amplifier with 1 Watt of input. When coupled into a 50 foot antenna (maximum
legal size) this will generate about 1 milliwatt of effective radiated
power. Is is pure carrier.
Mike
On Thu, Jan 13, 2011 at 1:46 AM, Jon Kirwan wrote:
> On Tue, 11 Jan 2011 18:42:01 -0500, you wrote:
>
> >On Tue, Jan 11, 2011 at 12:04 PM, Hugo Brunert
> >wrote:
> >
> >> >> Depends what you expect to "SEE"
> >>
> >> The square-wave output will be used to drive a class-D RF amplifier for
> a
> >> FCC "Part 15" (i.e. License free) transmitter. Assuming I can get at
> least
> >> 160 - 190 Khz pulses from it...
>
> Appendix E, starting page 91, for "Wireless Audio Devices?"
>
> http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-10-16A1.pdf
>
> Jon
>
>
Reply by Mike Staines●January 13, 20112011-01-13
OCY:
Thanks for your input.
You are correct in that tight frequency control is required to really get
the super-far distances I have been refering to. Many folks have
transmitters that are GPS tempered.
For my second stab at an MSP430 program I will just use the uP as a signal
generator and make sure that I can interface it with the amplifier and
antenna I already have. The experimenters in New England should be able to
hear me using headphones.
The next step would be to use the MSP430 to control a Phase Locked Loop for
better stability.
Regards,
Mike
On Thu, Jan 13, 2011 at 7:02 PM, old_cow_yellow wrote:
> Mike,
>
> How stable is required for that RF frequency? The on-chip DCO of MSP430 may
> not be stable enough (+/-3%).
>
> You may use the 32768Hz crystal (included in the kit) as a reference to
> periodically adjust the DCO. I think even after that, the best you can get
> is about +/-0.25%. (And if you examine the clocks cycle by cycle, some of
> them are faster and some of them are slower -- differ by as much as 8%.)
>
> An alternative is to wire the 12 MHz clock (available on the Launchpad
> board) to the target chip. The chip can divide this clock by an integer and
> route that to one of the pins as exciter.
>
> --OCY
>
> --- In m... , Mike Staines
> wrote:
> >
> > >> The carrier is at 160-190kHz??
> >
> > In that range, yes.
> >
> > Typically, I transmit on 185.302 KHz but we can go anywhere in that range
> > with the equipment and power levels I have described.
> >
> > Mike
> >
> > On Thu, Jan 13, 2011 at 4:24 PM, Jon Kirwan wrote:
> >
> > >
> > >
> > > On Thu, 13 Jan 2011 15:01:19 -0500, Mike wrote:
> > >
> > > >>> Appendix E, starting page 91, for "Wireless Audio Devices?"
> > > >
> > > >Thanks, Jon.
> > > >
> > > >Fortunately, we do not send audio (generally). And The frequencies we
> use
> > > >are not part of that Report and Order.
> > > >
> > > >This was the (infamous, to some) Report and Order from the FCC that
> > > removed
> > > >Wireless microphones off of frequencies that the FCC wants to use for
> > > >broadband. Many organizations (particularly church groups) were left
> with
> > > >suddenly illegal wireless microphones.
> > > >
> > > >To relate this to my MSP430 project: I will be using the MSP430 to
> > > generate
> > > >a signal in the 160-190 KHz range. A timer will also key the signal on
> and
> > > >off as Morse code. The toggled output pin will connect to a Class-D
> > > >amplifier with 1 Watt of input. When coupled into a 50 foot antenna
> > > (maximum
> > > >legal size) this will generate about 1 milliwatt of effective radiated
> > > >power. Is is pure carrier.
> > > >
> > > >Mike
> > >
> > > The carrier is at 160-190kHz??
> > >
> > > Jon
> > >
> > >
> >
> >
> >
> >
>
Reply by Mike Staines●January 13, 20112011-01-13
>> So now I'm interested in hearing more, I guess.
I feel pretty ignorant.
Oh, don't. This is all experimental. Some Europeans are getting 100
Kilometers of distance sending signals at 8 KHz (in the middle of the audio
range).
If anyone else is interested you can find more information at the web page
of the Long Wave Club of America: www.lcwa.org or contact me directly at
m...@email.com
Regards,
Mike
On Thu, Jan 13, 2011 at 6:37 PM, Jon Kirwan wrote:
> On Thu, 13 Jan 2011 17:54:39 -0500, Mike wrote:
>
> >>> The carrier is at 160-190kHz??
> >
> >In that range, yes.
> >
> >Typically, I transmit on 185.302 KHz but we can go anywhere in that range
> >with the equipment and power levels I have described.
>
> So that helps explain why 1 watt input delivers 1/1000th of
> that radiated? The antenna length of 50' is no where close
> to a quarter-wave or more.
>
> (I'm imagining a simple, straight wire type and radiation
> patterns for horizontally aligned vs earth as well as
> vertically aligned vs earth here. I have zero training,
> experience in RF, just bits and pieces in my memory which I
> poorly fathom. But at this frequency, it seems to wreck all
> my recollections about far field and near field -- Fraunhofer
> far field equation doesn't make any sense relative to
> reactive near field equation as the one is supposed to be
> larger than the other and... well, isn't.)
>
> So now I'm interested in hearing more, I guess. I feel
> pretty ignorant.
>
> Jon
>
>
Reply by old_cow_yellow●January 13, 20112011-01-13
Mike,
How stable is required for that RF frequency? The on-chip DCO of MSP430 may not
be stable enough (+/-3%).
You may use the 32768Hz crystal (included in the kit) as a reference to
periodically adjust the DCO. I think even after that, the best you can get is
about +/-0.25%. (And if you examine the clocks cycle by cycle, some of them are
faster and some of them are slower -- differ by as much as 8%.)
An alternative is to wire the 12 MHz clock (available on the Launchpad board) to
the target chip. The chip can divide this clock by an integer and route that to
one of the pins as exciter.
--OCY
--- In m..., Mike Staines wrote: >
> >> The carrier is at 160-190kHz??
>
> In that range, yes.
>
> Typically, I transmit on 185.302 KHz but we can go anywhere in that range
> with the equipment and power levels I have described.
>
> Mike
>
> On Thu, Jan 13, 2011 at 4:24 PM, Jon Kirwan wrote:
>
> >
> >
> > On Thu, 13 Jan 2011 15:01:19 -0500, Mike wrote:
> >
> > >>> Appendix E, starting page 91, for "Wireless Audio Devices?"
> > >
> > >Thanks, Jon.
> > >
> > >Fortunately, we do not send audio (generally). And The frequencies we
use
> > >are not part of that Report and Order.
> > >
> > >This was the (infamous, to some) Report and Order from the FCC that
> > removed
> > >Wireless microphones off of frequencies that the FCC wants to use for
> > >broadband. Many organizations (particularly church groups) were left
with
> > >suddenly illegal wireless microphones.
> > >
> > >To relate this to my MSP430 project: I will be using the MSP430 to
> > generate
> > >a signal in the 160-190 KHz range. A timer will also key the signal on
and
> > >off as Morse code. The toggled output pin will connect to a Class-D
> > >amplifier with 1 Watt of input. When coupled into a 50 foot antenna
> > (maximum
> > >legal size) this will generate about 1 milliwatt of effective radiated
> > >power. Is is pure carrier.
> > >
> > >Mike
> >
> > The carrier is at 160-190kHz??
> >
> > Jon
> >
> >
>
>
Reply by Jon Kirwan●January 13, 20112011-01-13
On Thu, 13 Jan 2011 17:54:39 -0500, Mike wrote:
>>> The carrier is at 160-190kHz??
>
>In that range, yes.
>
>Typically, I transmit on 185.302 KHz but we can go anywhere in that range
>with the equipment and power levels I have described.
So that helps explain why 1 watt input delivers 1/1000th of
that radiated? The antenna length of 50' is no where close
to a quarter-wave or more.
(I'm imagining a simple, straight wire type and radiation
patterns for horizontally aligned vs earth as well as
vertically aligned vs earth here. I have zero training,
experience in RF, just bits and pieces in my memory which I
poorly fathom. But at this frequency, it seems to wreck all
my recollections about far field and near field -- Fraunhofer
far field equation doesn't make any sense relative to
reactive near field equation as the one is supposed to be
larger than the other and... well, isn't.)
So now I'm interested in hearing more, I guess. I feel
pretty ignorant.
Jon
Reply by Mike Staines●January 13, 20112011-01-13
>> The carrier is at 160-190kHz??
In that range, yes.
Typically, I transmit on 185.302 KHz but we can go anywhere in that range
with the equipment and power levels I have described.
Mike
On Thu, Jan 13, 2011 at 4:24 PM, Jon Kirwan wrote:
> On Thu, 13 Jan 2011 15:01:19 -0500, Mike wrote:
>
> >>> Appendix E, starting page 91, for "Wireless Audio Devices?"
> >
> >Thanks, Jon.
> >
> >Fortunately, we do not send audio (generally). And The frequencies we use
> >are not part of that Report and Order.
> >
> >This was the (infamous, to some) Report and Order from the FCC that
> removed
> >Wireless microphones off of frequencies that the FCC wants to use for
> >broadband. Many organizations (particularly church groups) were left with
> >suddenly illegal wireless microphones.
> >
> >To relate this to my MSP430 project: I will be using the MSP430 to
> generate
> >a signal in the 160-190 KHz range. A timer will also key the signal on and
> >off as Morse code. The toggled output pin will connect to a Class-D
> >amplifier with 1 Watt of input. When coupled into a 50 foot antenna
> (maximum
> >legal size) this will generate about 1 milliwatt of effective radiated
> >power. Is is pure carrier.
> >
> >Mike
>
> The carrier is at 160-190kHz??
>
> Jon
>
>
Reply by Jon Kirwan●January 13, 20112011-01-13
On Thu, 13 Jan 2011 15:01:19 -0500, Mike wrote:
>>> Appendix E, starting page 91, for "Wireless Audio
Devices?"
>
>Thanks, Jon.
>
>Fortunately, we do not send audio (generally). And The frequencies we use
>are not part of that Report and Order.
>
>This was the (infamous, to some) Report and Order from the FCC that removed
>Wireless microphones off of frequencies that the FCC wants to use for
>broadband. Many organizations (particularly church groups) were left with
>suddenly illegal wireless microphones.
>
>To relate this to my MSP430 project: I will be using the MSP430 to generate
>a signal in the 160-190 KHz range. A timer will also key the signal on and
>off as Morse code. The toggled output pin will connect to a Class-D
>amplifier with 1 Watt of input. When coupled into a 50 foot antenna (maximum
>legal size) this will generate about 1 milliwatt of effective radiated
>power. Is is pure carrier.
>
>Mike
