2311
Bacon, BBQ, Beef, And More / Re: Sugar’s Sick Secrets
« on: January 11, 2019, 1917 UTC »
While I feel sugar should be regulated as a CII drug, they'll never take my oj or hot cocoa!
Shortwave Pirate Radio In North America And Around The World, And Other Signals That Go Bump In The Night
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2312
Equipment / Re: Outdoor Under the Eaves Loop vs. Active Mini-Whip Antenna
« on: January 11, 2019, 1915 UTC »
Do you have a dmm to do some checking with?
2313
Equipment / Re: The SW200 LPAM, Part #15, Amateur Radio AM, Audio Processor.
« on: January 11, 2019, 1913 UTC »
Iono, with a pc and some (probably free) audio software you could probably approximate anything that thing can do.
2314
HF Mystery Signals / Re: UNID 8000kHz persistent signal
« on: January 11, 2019, 1911 UTC »
Copied here too @ 1910Z, S5/8.
2315
VHF/UHF Logs, including satellites and radiosondes / Re: UHF mil air
« on: January 11, 2019, 1904 UTC »
Neacp/tacamo/glass flight burning mux on 366.600MHz 1842Z 11JAN19
DTMF and modem traffic on orderwires.
Abrupt qsy to 338.950 @ 1900Z, apparently transitioning to different GEP.
DTMF and modem traffic on orderwires.
Abrupt qsy to 338.950 @ 1900Z, apparently transitioning to different GEP.
2316
Bacon, BBQ, Beef, And More / Re: Reversal of Type 2 Diabetes in 60% of participants
« on: January 10, 2019, 2029 UTC »
"No other diet has had results that come close. By contrast, the American Diabetes Association reports only 0.1% reversal on their nutritional program."
I was just thinking how the US "healthcare" system is decried as being flawed and non responsive when in actuality it is completely effective at its designed task - the extraction of as much wealth as possible from a given patient/insurance/state. Being ex ems and pharmacy, I've seen it from multiple angles. Remember, they don't make any money from healthy people, well, the insurers do but that's not my point.
I was just thinking how the US "healthcare" system is decried as being flawed and non responsive when in actuality it is completely effective at its designed task - the extraction of as much wealth as possible from a given patient/insurance/state. Being ex ems and pharmacy, I've seen it from multiple angles. Remember, they don't make any money from healthy people, well, the insurers do but that's not my point.
2317
General Radio Discussion / Re: New satellites that will triangulate any signal in the world.
« on: January 10, 2019, 2023 UTC »
How nice, we get to witness the birth of the "commercial" NRO.
2318
SDR - Software Defined Radio / Re: A *few* questions
« on: January 10, 2019, 2007 UTC »
Also, in some cases the sdr noise blanker may be on by default, and/or set to too high a value, thus causing distortion to appear.
In such case simply reduce the nb level or disable it, if temporarily. I usually set nb level to cut off the very high level random spikes like a car going by with a bad plug wire and leave it on all the time. In a sdr rig, you can normally increase the nb value till all noise melts away, and it takes the band with it. If you had only very weak signals to listen to this would be a good use for all that noise blanking, but in the real world, too high a level will make the sdr inoperative.
I suspect this nb level setting is one of the number one causes of new sdr user complaints; they try the sdr, it pukes and they can't find a sig worth listening to due to all the spurs because the nb level is too high, and they hate sdr from then on.
One way to "set and forget" adjust it is to find a strong ambc or hfbc station, tune a few kc off so you get splatter, and adjust the nb to the point of distortion, then back it off. That should put the nb level optimally.
Additionally, make sure you're not running the sdr wide open as far as RF and IF gain. In the RTL SDR V3 and RSP2 sdrs, I always disable IF gain and agc, and set the RF gain accordingly.
Another thing to consider is Decimation. If the sdr application offers Decimation, crank in as much as you can, this is a good thing and too much is just right. With Decimation, you trade bandwidth for dynamic range and sensitivity. If you want to view 10MHz of spectrum you're not going to be able to use much if any Decimation, if all you want to do is listen to 6KHz or less of spectrum, crank in the Decimation.
I don't use sdr# so don't know if it offers Decimation, but HDSDR and SDRuno do, oddly HDSDR offers more Decimation levels in Zero IF mode than High IF mode. In SDRuno with a Decimation at 32, the screen has about 200KHz of spectrum, the Decimation increases the dynamic range markedly over the hard wired 12bit adc dynamic range.
In such case simply reduce the nb level or disable it, if temporarily. I usually set nb level to cut off the very high level random spikes like a car going by with a bad plug wire and leave it on all the time. In a sdr rig, you can normally increase the nb value till all noise melts away, and it takes the band with it. If you had only very weak signals to listen to this would be a good use for all that noise blanking, but in the real world, too high a level will make the sdr inoperative.
I suspect this nb level setting is one of the number one causes of new sdr user complaints; they try the sdr, it pukes and they can't find a sig worth listening to due to all the spurs because the nb level is too high, and they hate sdr from then on.
One way to "set and forget" adjust it is to find a strong ambc or hfbc station, tune a few kc off so you get splatter, and adjust the nb to the point of distortion, then back it off. That should put the nb level optimally.
Additionally, make sure you're not running the sdr wide open as far as RF and IF gain. In the RTL SDR V3 and RSP2 sdrs, I always disable IF gain and agc, and set the RF gain accordingly.
Another thing to consider is Decimation. If the sdr application offers Decimation, crank in as much as you can, this is a good thing and too much is just right. With Decimation, you trade bandwidth for dynamic range and sensitivity. If you want to view 10MHz of spectrum you're not going to be able to use much if any Decimation, if all you want to do is listen to 6KHz or less of spectrum, crank in the Decimation.
I don't use sdr# so don't know if it offers Decimation, but HDSDR and SDRuno do, oddly HDSDR offers more Decimation levels in Zero IF mode than High IF mode. In SDRuno with a Decimation at 32, the screen has about 200KHz of spectrum, the Decimation increases the dynamic range markedly over the hard wired 12bit adc dynamic range.
2319
SDR - Software Defined Radio / Re: Some SDR comparisons on the DGPS band
« on: January 10, 2019, 1948 UTC »
"At Smolinksi Electronics, we only use the highest quality low noise op amps in our all new for 2019 VLF Band Amplifier!"
"They're like Parametric Amplifiers but for VLF!"
Get yours today!
Also see here for related;
http://www.sdrplay.com/community/viewtopic.php?f=7&t=4003
"They're like Parametric Amplifiers but for VLF!"
Get yours today!
Also see here for related;
http://www.sdrplay.com/community/viewtopic.php?f=7&t=4003
2320
Equipment / Re: Outdoor Under the Eaves Loop vs. Active Mini-Whip Antenna
« on: January 10, 2019, 1937 UTC »
"Not sure about the double run loop. Considering the second run of wire would be running parallel to the first run, wouldn't there be a coupling problem? It would be twice as long electrically but it will share the same stand-offs attached to the wood trip."
Give it a shot and see how it plays.
Give it a shot and see how it plays.
2321
Utility / Re: 11175 USB
« on: January 09, 2019, 2223 UTC »
SOPHOMORE calling SKYTRAIL via pp by AUGUSTINE re burning on RF16 and RF12 and have lost connection @ 2222Z 09JAN19
2322
Utility / Re: 11232 USB 2144Z 08JAN19
« on: January 09, 2019, 1948 UTC »
KOMODO 4 in sector 6 calling Trenton Military for rc @ 1946Z 09JAN19, KOMODO 4 requests pp to xxx xxxx, callsign PEACHTREE.
KOMODO 4 has multiple in flight electronics and warning indicators issues to report.
Crypto seed needs rekeyed.
PME control panel indicator is inop.
CCMSD spot 3 inop.
KOMODO 4 has multiple in flight electronics and warning indicators issues to report.
Crypto seed needs rekeyed.
PME control panel indicator is inop.
CCMSD spot 3 inop.
2323
Equipment / Re: Outdoor Under the Eaves Loop vs. Active Mini-Whip Antenna
« on: January 09, 2019, 1933 UTC »
Hmmm. This is odd as loops are normally very decent antennas, considering the lengths of wire involved. Mine performed very well and was almost identical in layout to yours, fed with rg6 with ferrites at each end, but must admit I don't have a active ant like yours to compare. I'd make sure there's no shorts or bad coax or such forth.
I'd use both wires in the pair as a single conductor, but it'd be fun to see how the loop fared with two turns instead of just one. With two turns you'd likely be better off with a balun, I think most loops have around 1k z at their full wavelength frequency.
One thing to consider is the feed to the active, if you don't have ferrites just under the active on the coax line, the coax line is acting as an antenna feeding the active as the active is a dipole in such a case. Ferrites at the feed point of the active will disconnect the outer shield of the feedline from the active - you may have employed a nonconductive mast but the feedline's acting as one anyway. Also if you use wire rather than via the coax line to power to the active, those wires will act as part of the active antenna dipole. They can be decoupled from the antenna by ferrites also.
I'd use both wires in the pair as a single conductor, but it'd be fun to see how the loop fared with two turns instead of just one. With two turns you'd likely be better off with a balun, I think most loops have around 1k z at their full wavelength frequency.
One thing to consider is the feed to the active, if you don't have ferrites just under the active on the coax line, the coax line is acting as an antenna feeding the active as the active is a dipole in such a case. Ferrites at the feed point of the active will disconnect the outer shield of the feedline from the active - you may have employed a nonconductive mast but the feedline's acting as one anyway. Also if you use wire rather than via the coax line to power to the active, those wires will act as part of the active antenna dipole. They can be decoupled from the antenna by ferrites also.
2324
Equipment / Re: A splitter to stop my KiwiSDR from overloading
« on: January 09, 2019, 1924 UTC »
https://www.youtube.com/watch?v=u6RNtjYxiNw
Also, for us cheapies, using a cable tv splitter is an option for feeding multiple rx. On the splitters with more than two outs, often one will be more insensitive than the others and will be marked on the casing as such, this is the port you'd want to use for a rig that overloads.
Also, for us cheapies, using a cable tv splitter is an option for feeding multiple rx. On the splitters with more than two outs, often one will be more insensitive than the others and will be marked on the casing as such, this is the port you'd want to use for a rig that overloads.
2325
VHF/UHF Logs, including satellites and radiosondes / Re: UHF mil air
« on: January 08, 2019, 2257 UTC »
Neacp/tacamo/glass flight burning mux on 338.950MHz 2256Z 08JAN19
Ssb voice and modem traffic.
Ssb voice and modem traffic.