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. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - digitalmod

Pages: 1 ... 20 21 22 23 24 25 26 27 [28] 29 30 31 32 33 34 35 36 ... 39
406
General Radio Discussion / Re: Broadcasting in SSB many advanategs a few disadvantages
« on: February 01, 2018, 0006 UTC »
 8) Yeah, 10 kHz would be great, but you would need "tinker" with the DDS and transmitter to get a pass band that decent.
Then, at ten kHz, on shortwave is problematic since more channel noise can decrease your listeners pleasures.
If you go AM you need a whole lotta power to keep the s to noise acceptable. For a free radio station that could attract SHARKS, since any idiot can tune AM, but much better radios and SWL ops needed to tune SSB.
I recall about twenty or maybe more years ago, I heard a VOA transmission with carrier inserted. It carried two programs. One on USB and another on Lower. 8) BTW talk about sidebands, CHU time signal only transmits the USB and the carrier. Its cool to see it on the SDR. Case in point, the Toronto parallel station CFRX. Its said the transmitter is a Kw double side band, but when I listen except certain times of day.. selective fading, carrier dropping down below here good fidelity is heard and so on.
The big ones 1 million watt ERP stations even have fades. I can hear about anytime of year the 500kw, maybe 3 megawatt ERP
India Radio station on 7550. But its a non hi fi copy.  :-X

407
North American Shortwave Pirate / Re: UNID 6930 USB 2243 UTC 31 Jan 2018
« on: January 31, 2018, 2352 UTC »
 :D  544 copy here. I think that was Montreal Rose testing. Not sure.  8)

408
General Radio Discussion / Re: Broadcasting in SSB many advanategs a few disadvantages
« on: January 31, 2018, 1813 UTC »
 No, music transmitted from a DDS transmitter and received on a stable SDR with about 3 kHz band pass sounds damn decent.
Examples Yetti radio and CNR on my sdr sound at least as good as AM and less noise.
The reason early ssb failed was the same reason DRM will fail.. nobody has the receivers in shortwave to make the programming even available, much less sound as decent as 20-20,000 hertz you routinely get from  DSB = direct satellite Broadcasting or
the Web. As long as the Web bandwidth keeps expanding all RF broadcasting will end.
You Asussi already have Sheperton bite the dust. Its just the beginning. :o

409
General Radio Discussion / Re: Two Colorado pirates off after FCC raids last week.
« on: January 31, 2018, 0104 UTC »
 8)  In 2007 I drove to Brattleboro, Vt where for at least ten years Radio Free Brattleboro had been operating. The station was a mire ten watts with antenna on some building in the down town. I copied it just fine and it wasn't even stereo! But it's range was only a mile up and down I 91 ! A broadcaster in Mass had complained to FCC, but for no good reason, just making waves.
It took a decade, but finally the Federal Judge signed a warrant to get FCC in on a bust.
They came into the station with a crow bar in early morning, no staff were there. They confiscated every piece of gear including mixers and CD players.
They had TWO armed federal marshals and dupped the local police to help them. Probably wrong because the station had strong community support.
Later they had egg on face and did award a low power construction permit in 2010. If the equipment was ever returned I never heard. Generally FCC holds a grudge against any person or organization that defies it. You will be punished. The principles of Free Radio were never awarded a license.
The good news is that LPFM does today have support and community participation the Free Station had.
It took FCC ten years, but when they struck it was with VIOLENCE and break in.
I think this says FCC is really a bunch of Barney Fifes.. really sissy pants :-X

How could I get this wrong? This says Bust was earlier than 2007?
Amazes how they waste tax money on this defending the false fears and claims of licensed for profits.
Even NPR which I detest, made claims its stations would be interfered with if FCC allowed LPFM.
In fact NPR and Religious thunder boxes which are NOT educational broadcasters populate low end of FM band.

  http://www.mediageek.net/2005/06/brattleboro-reformer-on-rfb-raid-eyewitness-account-and-police-chief-distances-his-force/

410
The RF Workbench / Re: Amperage of Fuse in Streachy Lunch Box
« on: January 31, 2018, 0049 UTC »
  This is a tiny fuse. If its marked it will take a magnifying glass.

411
North American Shortwave Pirate / Re: Unid 6940 khz USB 2246 UTC 30 Jan 2018
« on: January 31, 2018, 0040 UTC »
 :o Conditions tonight very poor. Band flat as a pancake run over twice.

412
General Radio Discussion / Broadcasting in SSB many advanategs a few disadvantages
« on: January 30, 2018, 1730 UTC »
 8)

After doing so weak signals SWL I am going on the side of SSB for best signals especially in weak signal or low Signal to Noise.
Transmitters are more complex ,but it easier on transmitter because its only one side band and the duty cycle for power is same as an Audio AMP. Low generally.. the transmitter will not fry itself.

Disadvantage : More complex and STABLE receivers were once mandated, but today a 30 dollar SDR and computer meet the rx requirement.
Audio pass band can be tailored, but caveat, more bandwidth will bring in more NOISE, in college I think they said that was Nyquest's law??
Listening to some of the SSB stations I conclude you need a DDS transmitter and adjustable pass band and if that not possible an external parametric band audio equalizer. Audio even in a very tiny 3 kilohertz can be made to sound damn decent.

Of course AM is still vintage and so easy to receive, but only if you have at least a 20db or better signal to noise. That's not smart considering we have enemies listening. keep them guessing
That may most often be difficult and as you all know the bigger the signal the more smoke the radio Police will sniff. :-\

413
The RF Workbench / Amperage of Fuse in Streachy Lunch Box
« on: January 30, 2018, 1704 UTC »
 8) Looks as if I have an open, but it doesn't look blown. DMM says it is.
What is the rating of the fuse if anyone knows including of course its Master Streach 8)

414
Latin American Pirate / Re: UNID 6972.95 kHz AM 2201 UTC 29 Jan 2018
« on: January 30, 2018, 0049 UTC »
 ::) Hearing what sounds like carriers beating at less than 1000 hertz, but no recognizable audio
Condition are today much improved ! ;D

415
North American Shortwave Pirate / Re: UNID 6955 AM then USB 1911 UTC 28 Jan 2018
« on: January 30, 2018, 0000 UTC »
Pigmeat, you get no argument here the penalty for snitching is death by hanging! I don't have ocean within 200 miles

416
North American Shortwave Pirate / Re: Clever Name Relay 6940 khz USB 2314 UTC 29 Jan 2018
« on: January 29, 2018, 2341 UTC »
 ::)  Ok, s9 am using FT900 rather than SDR .. Great signal, very little fading. Audio is "mello"

417
North American Shortwave Pirate / Re: Voice of Yetti Radio International 6960 USB 2133 UTC 29 Jan 2018
« on: January 29, 2018, 2207 UTC »
  Vintage Andre, just from the VINES

https://sc01.alicdn.com/kf/HTB1GUhnLpXXXXcxXXXXq6xXFXXXn/Orban-Optimod-8100-FM-Broadcast-Audio-Processor.jpg

418
North American Shortwave Pirate / Re: UNID 6955 AM then USB 1911 UTC 28 Jan 2018
« on: January 29, 2018, 1210 UTC »
 ::)
 8) Dearest Pigmeat, be nice por favor..

419
North American Shortwave Pirate / Re: UNID 6930 USB 2328 UTC 28 Jan 2018
« on: January 29, 2018, 0030 UTC »
Nice old Radio Show.. can you play Dragnet or FBI in Peace and War. I used to listen to those Sunday night waiting for the bath tub.. school was Monday!!

Also CW ID as Pee Wee Radio
Signals here 544 slight fades.

420
North American Shortwave Pirate / Re: Radio Illuminati 6960 AM 1900 UTC 28 Jan 2018
« on: January 28, 2018, 1909 UTC »
 8) Yes, I have high noise, but am hearing a "beat" (musical beat). Maybe condx will improve.
This is a NEW station for me.  :o signal 22

Pages: 1 ... 20 21 22 23 24 25 26 27 [28] 29 30 31 32 33 34 35 36 ... 39