Here's applicable LTE output power "limits" paragraphs from FCC Rules Sec 27.50:
a) Fixed and base stations: 1000 watts (60 dBm) EIRP
, reducing to 65 watts
for 4500-ft HAAT (Height of Above Average Terrain)
b) Control stations and mobile stations: 30 watts (44.8 dBm) EIRP
c) Fixed stations: 30 watts (44.8 dBm) EIRP
d) Portable stations (hand-held devices): 3 watts (34.8 dBm) EIRP
e) Fixed and base stations: 50,000 Watts (77 dBm) EIRP
, subject to sec 27.55 constraints:
Remainder of FCC Sec 27 Rules can be found here:
LTE in the 700+ MHz Band just fired up last year in a few major cities and it was
announced that more (incl. San Diego) were being fired up this year, although
where and when wasn't disclosed. So it will probably take most of this year before
a large number of users have 4G LTE devices and are actually using the new system:
I'm still looking for interference analyzes and actual test reports, other than the
WSD adjacent-channel tests conducted by the FCC OET, CRC and others:
[See DTV and WSD Test REPORTS]
Note that WSD EMI test found leakage into a NEWLY installed CATV system.
[Three CRC Reports attached to the FCC Filing]
Note that WSD analyzes still apply for LTE interference to DTV, except the Next-next-next-etc
Adjacent Channel EMI is now of primary concern (e.g. N+1, N+2...N+7...N+14, N+15, etc).
Note that in the Super-Heterodyne STB/DTVs tested by the FCC-OET (see links above),
inadequate Image Rejection resulted in most (2005-2006) units under test being MUCH
more susceptible to EMI when it was 7 or 14-15 HIGHER than the desired channel. This
is easier to see on pg71 (of 145) in the CRC Report attached to MSTV's FCC Filing
(see link above). It is important to recognize that this means that a UHF DTV channel
will be MUCH MORE susceptible to EMI when it is about 42 MHz and 87 MHz higher than
the desired UHF channel frequency----smack in the middle of the LTE TRANSMIT BAND.
[Image Rejection Explanation]
So far, Charles Rhodes articles have concentrated on interference from DTV to LTE Devices,
not just adjacent channel (solved by on-going effort to vacate Ch51) but also third-order
Intermod products falling into the LTE User Device's RF input that may or may not be
filtered enough to prevent problems operating LTE devices anywhere "near" a DTV Tower:
Impact of LTE to CATV, esp Cable Modems:
In Europe, LTE has been active in their 800+ MHz Band for quite a while, so in
the fol. reports, shift all frequencies down by about 100 MHz to see what would
happen wrt North America's 700+ MHz Band.
U.K.'s OFCOM sponsored an LTE interference to DTT test, measuring "typical" levels
that would cause interference to OTA, CATV and even SAT (coax carries TV freqs):
In addition to finding that Super-Het. type DVB-T tuners are ALSO more susceptible
when the EMI is 7 Euro-Channels higher than the desired DTV channel, the first UK report
also tested so-called "Silicon" tuners [i.e. Double Conversion, such as from Microtune],
finding that although they did NOT have the Image Rejection susceptibility (as expected),
the susceptibility on other frequencies was about 10-20 dB WORSE than Super-Het. tuners
[no doubt due to the lack of an input tuned filter]. Unfortunately, they did not recognize
the importance of this HUGE difference, which widens the susceptibility bandwidth.
Yup, TV viewers sitting around their living room and also using their 4G LTE devices
could disrupt TV viewing if they were really close (and with one DTV, further away).
This was "cured" by adding an "LTE Band Pass Filter" which provided more or less
20 dB of Loss on the subject test frequencies. Signals leaking into the cable system
via a leaky cable was also found in one particular TV device, cured with a new cable.
With the EIRP level noted above, nearby Cell Phone Towers are going to be a problem.
AND, I have yet to see an analysis for dozens to 100's of bar patrons interfering
with the big screen DTV hung on the walls.....Nor effect of 100's to 1000's of other
4G LTE signals coming into a roof-top antenna from the extended neighborhood,
esp. in crowded metropolitan situation (1000 mobile phones is a 30 dB increase in EMI).
Studies for the Netherlands:
And one for Germany & Austria (with imperfect translations):
Here is a LTE-DTT Interference Overview from Rohde+Schwarz:
Latest update re Telco responsibiity to FIX THESE PROBLEMS in Europe:
I'm surprised the FCC, et. al. have kept this dirty little secret for such a long time.....