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OTA Reception Files (3 Feb 2009)Downloadable Files re On-The-Air Reception - by holl_ands
Includes DTV Antenna Specs (and measured Performance), measured Balun Loss, measured RF Splitter Loss & RG-6 Cable Loss Specs.
Also includes ATSC/NTSC Tuner Specs and Preamp Specs, plus a DTV Signal Overload Calculator and a Third Order Intermod Calculator.
UPDATE (24Mar2009): Updated DTV Interference Calculator Rev C.
UPDATE (26Mar2010): Added CECB Features List - mod 26Mar2010.
UPDATE (14Aut2011): Updated DTV Interference Calculator - Rev F.
UPDATE (12Sep2011): Updated DTV Preamp Signal Overload Calculator - Rev L to add VHF specific calculations.
UPDATE (25Sep2011): Updated "Preamp Comparison Chart - Rev A", due to W-G change to HDP-269 Max Input Spec.
UPDATE (13Mar2012): Updated "DTV Preamp Signal Level Overload Calculation - Rev M".
Fixed typo in W-G specs for 19 dB Gain Preamps - 99.4 dBuV vice 89.5 dBuV. Calculations not affected.
UPDATE (21Nov2012): Added five Spread Sheets (*.xls or *.xlsx) with Raw Data from various 4nec2 runs
that were used to prepare the Antenna Performance Charts used throughout this website.
If marked with one or more X's, the data has either been superseded by an alternative run and/or it
might have an unspecified PROBLEM...so ignore it.
UPDATE (1May2013): In my Modification to solidsignal's Preamp Comparison Chart, corrected AP-2870 Max Input to reflect (29Jan2010) update to Winegard Preamp specs.
UPDATE (10May2013): Added Interior Photos of Winegard AP-8700 and HDP-269 Preamps.
UPDATE (25Jul2013): Updated "DTV Preamp Signal Level Overload Calculation - Rev N" to reflect new W-G LNA200's ASSUMED 20 dB improvement in UHF Max Input compared to AP8700.
UPDATE (20Nov2013): Added Chart showing RS 15-00396 4G_LTE Low Pass Filter Loss.
UPDATE (19Apr2018): Added Charts showing Measured Insertion Loss for various Ferrite and PCB Baluns.
UPDATE (7Feb2019): Added Charts showing Measured Insertion Loss for various FM Band Reject Filters. |
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DTV, TV and FM Tower Locations (12 Sep 2009)DTV (green), TV (red) and FM (teal) Tower Locations for a few select cities.
Based on transmitter icon files downloaded from www.tvfool.com and www.fmfool.com
UPDATE (4 Nov 2011): Added FM Towers in vicinity of Ottawa, Canada.
UPDATE (16 Sep 2014): Added GoogleEarth view of Mt Wilson and Mt Harvard DTV Stations. Transmitter Icons downloaded from www.tvfool.com prior to Dec2009. |
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Interference (EMI) to DTV & DTT (24 Feb 2012)Interference (EMI) to Digital Television (DTV), aka Digital Terrestrial Television (DTT) in the U.K.
Various Test Results found in publicly available documents:
https://www.dc414.org/download/confs/defcon15/Speakers/Mohney/Extras/dc-15-mohney-maxtv_comments_1-31-07.pdf
[DTV EMI: Apdx B in MSTV & NAB Comments to FCC 31Jan2007, ET Docket Nos. 02-380 and 04-186.]
and
http://stakeholders.ofcom.org.uk/binaries/consultations/800mhz/statement/2010-0026.pdf
[UK - Bal Randhawa + Ian Parker, Cobham Tech Svcs - LTE EMI into Domestic DTT Systems, 2010-0026, Jan2010.] |
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4nec2 & Python Optimization Benchmarks (8 Oct 2013)4nec2 and Python Optimization Benchmark Files are posted here.
For 4nec2, they are ready to CALCULATE/NEC-Output-Data via "Use original file".
Additional Benchmark Test Files and Comparison Results are found here:
http://www.w8io.com/nec-benchmarks.htm
1. AMD PHENOM II Tri-Core, 3.5 GHZ Overclock with NEC2/MP Multiprocessor Enabled
NEC2 Engines versus [Original 4nec2 Single Processor Engines]:
Ran 4nec2:
a. BenchMark_hov4-8: 74.2 sec [281 sec with Original NEC2 Engines]
b. BenchMark_CM4251: 320 sec
c. BenchMark_M4+DAR: 146 sec
2. Intel i7-5820K Hex-Core (12-threads), with NEC2/MP Multiprocessor
Enabled NEC2 Engines versus [Original 4nec2's Single Processor NEC2 Engines]:
Ran 4nec2 Dec2015, 3.5 GHz Overclock:
a. BenchMark_hov4-8: 23.9 sec with 15-27% Utilization, [162 sec with Original]
b. BenchMark_CM4251: 97.4 sec with 8-30% Utilization
c. BenchMark_M4+DAR: 40.8 sec with 15-30% Utilization
Ran 4nec2 Dec2015, 4.125 GHz Overclock:
d. BenchMark_hov4-8: 34.1 sec
e. BenchMark_CM4251: 84.5 sec
f. BenchMark_M4+DAR: 34.7 sec
Ran 4nec2 Dec2015, 4.375 GHz Overclock:
g. BenchMark_hov4-8: 19.5 sec
h. BenchMark_CM4251: 81.9 sec
i. BenchMark_M4+DAR: 33.3 sec
3. PYTHON OPTIMIZATION BENCHMARK using NEC2/MP Multiprocessor Enabled NEC2 Engines,
RAN OCT 2013, Hi-VHF Hourglass-Loop NO-Reflector:
a. Intel i7-2670QM Quad-Core (8-threads) Laptop, 2.2 GHz (Max 3.1 GHz Turbo): 1-hr 43-min (and 1:44)
b. AMD Hex-Core, 3.9 GHz OC: 1-hr 1-min (and 1:04)
RAN NOV 2015, Hi-VHF Hourglass-Loop NO-Reflector:
c. AMD Tri-Core, 3.5 GHz OC: 1-hr 22-min
d. Intel i7-5820K Hex-Core (12-threads), DEFAULT 3.3 GHz: 1-hr 51-min
e. Intel i7-5820K Hex-Core (12-threads), OVERCLOCKED 4.1 GHz: 31-min |
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Loudspeaker Comparison (1 Jul 2017)Loudspeaker Comparisons: Peerless SWR-308 12-in XLS Sub-Woofer (p/n 830500) in CLOSED, VENTED, PASSIVE RADIATOR
(NOT Optimized, simply tried a second, unconnected SWR-308) and BANDPASS SINGLE TUNED Boxes. In response to:
https://www.avsforum.com/forum/89-speakers/2882033-speaker-ticking-noise.html#post53999617
Excel Spread Sheet at bottom contains an [old] database of "T/S" Parameters for MANY Speakers,
or you can add you own Speaker "T/S" Parameters obtained from mfr's literature.
Click on Thumbnail to see Higher-Rez Version.
UPDATE (29Sep2018): Added Charts for Infinite Baffle or Transmission Line, simulated by Very Large 1000-liter (35.3 cu. ft.) Closed Box. |
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