2161
Other / Re: 6974.4 CW 0030 16 February 2019
« on: February 16, 2019, 1847 UTC »
Any buoys operate on that freq range?
Shortwave Pirate Radio In North America And Around The World, And Other Signals That Go Bump In The Night
We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations.
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2162
Utility / Re: 11232 USB 2144Z 08JAN19
« on: February 15, 2019, 2135 UTC »
MAESTRO 01 (out of Nellis AFB) currently in sector 8 in pp to RAYMOND 21 via Trenton Mil, Trenton Mil is not audible here oddly enough. 2132Z 15FEB19
2163
General Radio Discussion / Re: WWV Petition
« on: February 15, 2019, 2106 UTC »
Huzzah for WWV and President Trump!
2164
General Radio Discussion / Re: Minnesota to decommission NDBs starting in 2019
« on: February 15, 2019, 2104 UTC »
One emp and they'll wish they'd have kept that already paid for ndb infrastructure intact.
2165
Equipment / Re: Antenna Identification needed
« on: February 15, 2019, 2103 UTC »
Have you unraveled it to see how long it is?
2166
Equipment / Re: RA0SMS vs PA0RDT Active Mini Whip - RA0SMS is Very Noisy - Why?
« on: February 15, 2019, 2059 UTC »
I went looking for the schema for the russian antenna cuz I have an nos dual gate mosfet I've been dying to kill with static in some worthy circuit and came upon these discussions;
https://valentfx.com/vanilla/discussion/1102/quick-comparison-between-the-pa0rdt-mini-whip-and-the-ra0sms-mini-whip
http://www.sdrplay.com/community/viewtopic.php?t=1138
And the schema;
http://www.ra0sms.ru/p/the-active-antenna-mini-whip-10-khz-30.html
Looks very simple, will have to roll one and see how it fares.
Also ran across this active;
https://www.youtube.com/watch?v=F0MD51FqPPY
https://www.amateurradioshop.nl/webshop/print-sets--experimenteer-aktieve-antennes-enz/detail/542/set-miniwhip-antenne-printjes-10khz---30mhz.html
The dynamic range specs are outstanding.
And for the technically adept, this schema offers decent specs too;
http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf
https://valentfx.com/vanilla/discussion/1102/quick-comparison-between-the-pa0rdt-mini-whip-and-the-ra0sms-mini-whip
http://www.sdrplay.com/community/viewtopic.php?t=1138
And the schema;
http://www.ra0sms.ru/p/the-active-antenna-mini-whip-10-khz-30.html
Looks very simple, will have to roll one and see how it fares.
Also ran across this active;
https://www.youtube.com/watch?v=F0MD51FqPPY
https://www.amateurradioshop.nl/webshop/print-sets--experimenteer-aktieve-antennes-enz/detail/542/set-miniwhip-antenne-printjes-10khz---30mhz.html
The dynamic range specs are outstanding.
And for the technically adept, this schema offers decent specs too;
http://home.earthlink.net/~christrask/Complementary%20Push-Pull%20Amplifiers.pdf
2167
VHF/UHF Logs, including satellites and radiosondes / Re: UHF mil air
« on: February 15, 2019, 0018 UTC »
Neacp/tacamo/glass flight burning mux on 325.400MHz 0015ZZ 15FEB19
Modem traffic on orderwire.
Modem traffic on orderwire.
2168
Equipment / Re: RA0SMS vs PA0RDT Active Mini Whip - RA0SMS is Very Noisy - Why?
« on: February 14, 2019, 2144 UTC »
Make sure the gain is the same as well as the freq range when testing, reason being if the same conditions do not apply, then you may be overloading the radio with one amp and not the other.
Also some switching mode power supplies use 10kc as a resonating freq and can show up on an antenna as they are transmitting, this is a good reason to endeavor to persevere to use only linear power supplies. Also also, a pc or networking gear may make rfi every 10Kc or so, most pc and networking related gear employs switching mode power supplies due the efficiency, rfi be damned.
Also some switching mode power supplies use 10kc as a resonating freq and can show up on an antenna as they are transmitting, this is a good reason to endeavor to persevere to use only linear power supplies. Also also, a pc or networking gear may make rfi every 10Kc or so, most pc and networking related gear employs switching mode power supplies due the efficiency, rfi be damned.
2169
Equipment / Re: mag loop inside garage or attic.
« on: February 14, 2019, 2135 UTC »
My vote is put it where it'll be most effective yet out of the elements/most survivable or exposed to foot traffic.
2170
Other / Re: ???? 7200 LSB 1930 UTC 14 Feb 2019
« on: February 14, 2019, 2132 UTC »
This has gone on for years now with the same actors. The shiny surface to it is it concentrates the miscreants in a single 3Kc slice of spectrum, however there's at least one miscreant freq on each band so the miscreants can follow the propagation.
2171
Shortwave Broadcast / Re: Which band
« on: February 14, 2019, 2129 UTC »
It used to be that the 7 to 10pm slice was prime listening for Americans as foreign stations would choose appropriate bands to employ to send to the US. Sadly, the vast majority of Americans view shortwave as archaic in the age of the cellphone and innernets.
The foreigners realised few Americans listened to their bcasts so they dropped them to North America, reduced them greatly, or went online. Only the poorest of the poor in the world don't have a smartphone with innernets, and these poorest of the poor remain as targets for shortwave broadcasters as they still use portable am shortwave radios to provide information and entertainment. If only it wasn't so expensive to burn megawatts, use huge costly antenna arrays, and of course pay the slick professional talent for producing radio programming.
That being said, I like the 9Mc and 6Mc bands as well as most of the others for dx porpoises
The foreigners realised few Americans listened to their bcasts so they dropped them to North America, reduced them greatly, or went online. Only the poorest of the poor in the world don't have a smartphone with innernets, and these poorest of the poor remain as targets for shortwave broadcasters as they still use portable am shortwave radios to provide information and entertainment. If only it wasn't so expensive to burn megawatts, use huge costly antenna arrays, and of course pay the slick professional talent for producing radio programming.
That being said, I like the 9Mc and 6Mc bands as well as most of the others for dx porpoises
2172
VHF/UHF Logs, including satellites and radiosondes / Re: UHF mil air
« on: February 14, 2019, 2109 UTC »
Neacp/tacamo/glass flight burning mux on 338.950MHz 2103Z 14FEB19
Some light reading on the effects of nuclear fireballs on radio propagation;
https://apps.dtic.mil/dtic/tr/fulltext/u2/a044561.pdf
https://apps.dtic.mil/dtic/tr/fulltext/u2/427020.pdf
This is interesting;
"High-altitude nuclear tests were made in 1958 and 1962 at different heights above the mid-Pacific area. Observations reveal MF and HF propagation anomalies caused by H-bomb-induced ionisation in the ionospheric D region, the effect on which varied with burst height of the explosion.
Periods of abnormal ionisation in the F region at Rarotonga after both of the explosions in 1958 are ascribed by Cummack and King (1959) to an upward movement of gas into the F region, where high compression ratios following the blast wave resulted in ionisation by collision. Abnormal F-region ionisation at the Pacific control point enabled enhanced reception in Wellington of 25 Mc/s and 21 Mc/s transmissions for several hours after the 1958 events. Similar enhancement of transmissions on 21 Mc/s-s
the highest frequency then in use by the BBC-was again observed following the July 1962 explosion."
https://www.tandfonline.com/doi/pdf/10.1080/00288306.1962.10420054
Some light reading on the effects of nuclear fireballs on radio propagation;
https://apps.dtic.mil/dtic/tr/fulltext/u2/a044561.pdf
https://apps.dtic.mil/dtic/tr/fulltext/u2/427020.pdf
This is interesting;
"High-altitude nuclear tests were made in 1958 and 1962 at different heights above the mid-Pacific area. Observations reveal MF and HF propagation anomalies caused by H-bomb-induced ionisation in the ionospheric D region, the effect on which varied with burst height of the explosion.
Periods of abnormal ionisation in the F region at Rarotonga after both of the explosions in 1958 are ascribed by Cummack and King (1959) to an upward movement of gas into the F region, where high compression ratios following the blast wave resulted in ionisation by collision. Abnormal F-region ionisation at the Pacific control point enabled enhanced reception in Wellington of 25 Mc/s and 21 Mc/s transmissions for several hours after the 1958 events. Similar enhancement of transmissions on 21 Mc/s-s
the highest frequency then in use by the BBC-was again observed following the July 1962 explosion."
https://www.tandfonline.com/doi/pdf/10.1080/00288306.1962.10420054
2173
Utility / Re: 11232 USB 2144Z 08JAN19
« on: February 13, 2019, 1939 UTC »
1938Z 13FEB19 Trenton Mil working ATLAS 341 who is working near Yorktown, wants Trenton to selcal GHAB, Trenton replies no traffic from RCC at this time, primary 11232, secondary 9007.
2174
Utility / Re: 11175 USB
« on: February 13, 2019, 1930 UTC »
Sometimes hfgcs lights up with honest to gawd spy traffic, when they send a message to one of the elint birds.
https://en.wikipedia.org/wiki/Boeing_RC-135
https://en.wikipedia.org/wiki/Boeing_RC-135