Thanks. I have a printed version of that chart hanging on the wall of
my palatial office. It's really a nice looking poster. However, both
the above URL and my wall chart are dated Oct 2003, which makes them
rather out of date. There have also been quite a bit of spectrum
juggling going on with various spectrum auctions, spectrum re-farming,
WiMax deployments, new allocations (e.g. 3650-3700 for WISP, 1710-1755
relocation), etc. If I want the latest, I go directly to the
bureaucracy at:
<http://www.fcc.gov/oet/spectrum/table/fcctable.pdf> (638KBytes)
which is dated Mar 17, 2008. The 2.2-2.4GHz stuff is on pages 34 thru
36.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
>Hi Jeff,
>
>"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
>news:p7mtv3pbtch1qnj28vanl0cvs9oamtul9c@4ax.com...
>> Linear or Class C?
>
>Linear.
>It's a spread-spectrum digital modulation method we cooked up ourselves that's
>meant to be highly interference resistant while still being high-speed.
The biggest source of interference is your own transmitter reflected
off some object and arriving late to the party, but just in time to
clobber the next packet, or fatally trash the incident signal. Also,
some nasty nulls due to frequency selective fading.
Pleeeeeze, no Xmax (xG) style claims:
<http://en.wikipedia.org/wiki/Xmax>
<http://www.xgtechnology.com/technology.asp>
>It's
>actually not as complicated as most of those commercial standards -- we're
>just doing "proof of concept" testing and collecting over-the-air bit-error
>rate statistics.
You don't need 10 watts of RF for that. 802.11a/g has a rather high
+7dB peak to average power ratio[1]. Hopefully, your scheme will be
better. Also, 10 watt power amps are not all that linear. If you
scheme requires minimal envelope distortion and good linearity, you
may need to buy a 10 watt amp, just to get 1 watt of linear output. On
a good day, figure on about 15% efficiency at 10 watts output, so you
need to supply about 67 watts of DC.
If you're testing this outdoors, you're going to trash a large number
of existing systems and users. Let me guess... your system belches RF
even when there's no data moving on the link? The FCC "licence" is
not an open invitation to operate a jammer.
>I can't say that much more about it, but that's due to
>customer confidentiality and all that -- the techniques used are generally
>well-known, and we're packaging up a bunch of them together to make something
>that is a bit innovative.
Hmmm... well known with lots of bits per baud? I'll guess
Wavelet/Fractal modulation?
Good luck...
[1] OFDM can tolerate about 2dB of compression so the real
peak-to-average power ratio is more like +5dB.
--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 jeffl@comix.santa-cruz.ca.us
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS
Reply by Rich Grise●April 11, 20082008-04-11
On Fri, 11 Apr 2008 09:31:20 -0700, Jeff Liebermann wrote:
> On Thu, 10 Apr 2008 23:50:08 -0400, RFI-EMI-GUY
>>There is an amateur radio band at 2300 MHz
>
> Sure, but it's normally not described as 2.2-2.4 GHz. See the subject
> line. There are plenty of other services in this frequency area:
> <http://www.jneuhaus.com/fccindex/960_mhz.html>
> <http://www.jneuhaus.com/fccindex/2_3_ghz.html>
>
> Incidentally, note that XM radio at 2332.50-2345.00 MHz and Sirius is
> at 2320.00-2332.50 MHz Lots of other users crammed in that band
> including my microwave oven.
"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:c53vv3t0umvosudvllslomrdk8na0gkk3i@4ax.com...
> Incidentally, note that XM radio at 2332.50-2345.00 MHz and Sirius is
> at 2320.00-2332.50 MHz Lots of other users crammed in that band
> including my microwave oven.
Interestingly the only area we're specifically not allowed to emit any signal
at all on is 2290-2310MHz -- NASA's deep space network and hams.
Given the type of signals we'll be transmitting (and the margin not being
allowed in 2290-2310 implies anyway) I don't expect it'll degrade Sirius or
XM, but it will be interesting to see.
---Joel
Reply by RFI-EMI-GUY●April 11, 20082008-04-11
Jeff Liebermann wrote:
(snip)
> at 2320.00-2332.50 MHz. Lots of other users crammed in that band
> including my microwave oven.
I think your microwave is misbehaving if it is operating that low!
>
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"�
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
Reply by Joel Koltner●April 11, 20082008-04-11
Hi Jeff,
"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:p7mtv3pbtch1qnj28vanl0cvs9oamtul9c@4ax.com...
It's a spread-spectrum digital modulation method we cooked up ourselves that's
meant to be highly interference resistant while still being high-speed. It's
actually not as complicated as most of those commercial standards -- we're
just doing "proof of concept" testing and collecting over-the-air bit-error
rate statistics. I can't say that much more about it, but that's due to
customer confidentiality and all that -- the techniques used are generally
well-known, and we're packaging up a bunch of them together to make something
that is a bit innovative.
---Joel
Reply by Jeff Liebermann●April 11, 20082008-04-11
On Thu, 10 Apr 2008 23:50:08 -0400, RFI-EMI-GUY
<Rhyolite@NETTALLY.COM> wrote:
>Jeff Liebermann wrote:
>> On Thu, 10 Apr 2008 14:07:31 -0700, "Joel Koltner"
>> <zapwireDASHgroups@yahoo.com> wrote:
>>
>>> Anyone have an off-the-shelf 2.2-2.4GHz amplifier they like? ~10W is what I'm
>>> after.
>>
>> Linear or Class C?
>>
>>> Mini-Circuits has their ZHL-30W-252+ which would be fine, although at
>>> $3k I'm continuing to do a bit of searching...
>>
>> See:
>> <http://www.ssbusa.com/kunamp1.html>
>> <http://www.kuhne-electronic.de/en/shop/142_Power_Amplifier>
>>
>>> (And before anyone asks, no, I'm not building a high-power WiFi amplifier and,
>>> yes, I do have the appropriate FCC license to put this thing on the air --
>>> with various restrictions on the exact frequencies and geographic locations,
>>> of course.)
>>
>> Can I guess? MMDS, ITFS, or WiMax?
> On Thu, 10 Apr 2008 14:07:31 -0700, "Joel Koltner"
> <zapwireDASHgroups@yahoo.com> wrote:
>
>> Anyone have an off-the-shelf 2.2-2.4GHz amplifier they like? ~10W is what I'm
>> after.
>
> Linear or Class C?
>
>> Mini-Circuits has their ZHL-30W-252+ which would be fine, although at
>> $3k I'm continuing to do a bit of searching...
>
> See:
> <http://www.ssbusa.com/kunamp1.html>
> <http://www.kuhne-electronic.de/en/shop/142_Power_Amplifier>
>
>> (And before anyone asks, no, I'm not building a high-power WiFi amplifier and,
>> yes, I do have the appropriate FCC license to put this thing on the air --
>> with various restrictions on the exact frequencies and geographic locations,
>> of course.)
>
> Can I guess? MMDS, ITFS, or WiMax?
>
There is an amateur radio band at 2300 MHz
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"�
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
>(And before anyone asks, no, I'm not building a high-power WiFi amplifier and,
>yes, I do have the appropriate FCC license to put this thing on the air --
>with various restrictions on the exact frequencies and geographic locations,
>of course.)
Can I guess? MMDS, ITFS, or WiMax?
--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558 jeffl@comix.santa-cruz.ca.us
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS
Reply by RFI-EMI-GUY●April 10, 20082008-04-10
Joel Koltner wrote:
> Anyone have an off-the-shelf 2.2-2.4GHz amplifier they like? ~10W is what I'm
> after. Mini-Circuits has their ZHL-30W-252+ which would be fine, although at
> $3k I'm continuing to do a bit of searching...
>
> (And before anyone asks, no, I'm not building a high-power WiFi amplifier and,
> yes, I do have the appropriate FCC license to put this thing on the air --
> with various restrictions on the exact frequencies and geographic locations,
> of course.)
>
> ---Joel
>
>
I found a pretty nice REMEC/Q-Bit model QBS-275 2400-2450MHz (+46dBm @
P1dB) amp made by QBit on e-bay. Similar amplifiers made by Toshiba in
the 2.2 to 2.4 GHz range are available from an e-bay seller Pyrojoseph.
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"�
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P