16
North American Shortwave Pirate / Re: Wolverine Radio 6950 USB *0117 UTC 17May15
« on: May 17, 2015, 0213 UTC »
Got him here 5/9+10, great signal. Interesting playlist so far, a few I don't know in there. Thanks for the show!
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.
Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale.
Very true. Had a hallicrafters sw receiver as a kid & more recently a SX101. Tubes just love AM. Just finished restoring a Heathkit DX40 TX as well. Hope to get that on the air soon outside of just a dummy load.. Need crystals or gotta build a vfo first though...
FYI you do realize that on a frequency such as 6925, the signal doesn't go that far locally right? It skips. Could have been clear as day 150 miles away.
Pretty much - However afaik Raspberry Pi only uses the FM mode so apart from digital & actual FM I'm not sure what you might use it for. AM/SSB I believe is not possible with it - at least yet..<g> Check this out for some info on setting up LPF's and antennas-
https://github.com/threeme3/WsprryPi
First off, I'll say that I've never touched those, but I do work for a DSP company. Won't say the name as I don't want to come off as trying to sell - Amateur radio isn't our market & I don't want to come off like that.
Having said that, DSP processing is much tighter than anything analog in terms of EQ's. I can create notch filters at 48db per active using IIR filters or even more with FIR. Tighter than a nun's.. um, well, you know. At *any* frequency that I want. Analog can be good in certain bands, but aren't really configurable & have good bandpass cutoffs. Our processors are made for live sound/studio applications, but I've been using mine on my HF rig as well for just that. On top of it, I also do all my mic processing (ALC, Compression & EQ (I have a crappy mic)) in the same box. I'm sure that something like this has been developed for Amateur radio as well. Just something to consider.
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17
General Radio Discussion / Re: Using HF rig as AM radio receiver
« on: November 11, 2014, 1540 UTC »The best Am receiver I ever owned for AM was a Hallicrafters SX-28 but those are a bit hard to find these days.
Very true. Had a hallicrafters sw receiver as a kid & more recently a SX101. Tubes just love AM. Just finished restoring a Heathkit DX40 TX as well. Hope to get that on the air soon outside of just a dummy load.. Need crystals or gotta build a vfo first though...
18
General Radio Discussion / Re: Using HF rig as AM radio receiver
« on: November 10, 2014, 1821 UTC »
It also depends on what you're after from it. Looking to pull in distant signals or good audio? I have an Icom PCR100 that was fairly deaf RF wise, but you could really open up the audio bandwidth & it sounds great. But if there are high power local adjacent stations, you'll want tight bandwidth. In the States I hear IBOC is also a huge challenge for MW dx'ers, so not sure what the best route for that issue is. I'd guess you'd be stuck with squeeky sound, but could be wrong.
19
Software / Re: What Radio related software would YOU like to see?
« on: October 27, 2014, 1903 UTC »
fldigi ported to android... Heard it's not possible due to the graphics library that it uses though...
Winlink 2k would be neat too.
Winlink 2k would be neat too.
20
The RF Workbench / Re: Symptoms of an oscillating amplifier?
« on: October 24, 2014, 1843 UTC »makeRF: I'm using the LM386 chip as an amp.
kaliic: The audio sounded fine, just quiet. The LM386 chip would get warm when transmitting. It would get really hot running a speaker without resistors. It wouldn't get warm when running a speaker with resistors.
Its not assembled anymore. It was bugging me why the sound didn't carry very far. I thought maybe because it was oscillating? I'll reply here if I tweak with it.
thanx
FYI you do realize that on a frequency such as 6925, the signal doesn't go that far locally right? It skips. Could have been clear as day 150 miles away.
21
Huh? / Re: Chuck Norris the DXer
« on: October 08, 2014, 1411 UTC »
Chuck Norris can wipe out all communication when he gets mad, by simply pounding his fist & causing a solar flare.
22
Equipment / Re: Good Antenna for Raspberry Pi
« on: October 01, 2014, 2201 UTC »
It's dead easy to build one. Just check out the ARRL's website - Loads of plans for antennas for pretty much any situation. Dipoles are very easy to construct - Just a T shape with the top bits cut to a specific length. Can be quite large though depending on the frequency. eg, for 6.925Mhz it is 33ft. 9 - 1/2in. or 10.299 M for one side...
23
General Radio Discussion / Re: RNI - Radio New York International
« on: October 01, 2014, 1805 UTC »
Very cool, thanks!
24
General Radio Discussion / Re: Is 87.7 MHz a good FM pirate frequency?
« on: October 01, 2014, 1707 UTC »
On top of what has been said about the TV sound aspect & it being out of band, it would be dead clear that it is a pirate signal. I personally wouldn't use it apart from tossing a signal from my living room to the bedroom..
25
Equipment / Re: Good Antenna for Raspberry Pi
« on: October 01, 2014, 1615 UTC »Got it. So essentially, after I get the LPF, I'll just need an antenna tuned for the shortwave band I choose. Any broadcasters recommend a frequency or band, or is 6925 kHz good? Other than that, Woo hoo! I can combine my two favorite hobbies!
Pretty much - However afaik Raspberry Pi only uses the FM mode so apart from digital & actual FM I'm not sure what you might use it for. AM/SSB I believe is not possible with it - at least yet..<g> Check this out for some info on setting up LPF's and antennas-
https://github.com/threeme3/WsprryPi
26
Equipment / Re: Good Antenna for Raspberry Pi
« on: September 29, 2014, 1402 UTC »
After a LPF, the proper antenna for the band that you'd be using it for... The Raspberry Pi's GPIO is *very* noisy & harmonic. A LPF is very much needed.
27
Huh? / Re: Drone, ham radio destroyed amid headbutting assault
« on: September 17, 2014, 2024 UTC »
Hmmmmm, I wonder how big a drone would have to be to hold an antenna aloft....
28
Equipment / Re: Noise canceling systems
« on: August 27, 2014, 1353 UTC »Good Day All!
I could get: Daiwa All Mode Active Filter AK606K , Datong FL1 and a Datong FL3, all in good condition!
All three in one 'packet' for 160 european coins
My Question,anybody get some experience with this stuff?
Good DX!
First off, I'll say that I've never touched those, but I do work for a DSP company. Won't say the name as I don't want to come off as trying to sell - Amateur radio isn't our market & I don't want to come off like that.
Having said that, DSP processing is much tighter than anything analog in terms of EQ's. I can create notch filters at 48db per active using IIR filters or even more with FIR. Tighter than a nun's.. um, well, you know. At *any* frequency that I want. Analog can be good in certain bands, but aren't really configurable & have good bandpass cutoffs. Our processors are made for live sound/studio applications, but I've been using mine on my HF rig as well for just that. On top of it, I also do all my mic processing (ALC, Compression & EQ (I have a crappy mic)) in the same box. I'm sure that something like this has been developed for Amateur radio as well. Just something to consider.
29
Equipment / Re: Audio Processing
« on: August 25, 2014, 2115 UTC »
Well, just listening to folks like Wolverine Radio & I'm just amazed that they get the audio (music) sounding as good as they do out of SSB. I do audio work myself & just wondered what processing they used for SSB. I understand the AM/FM requirements very well, just that SSB seems that it would require much more work to get it sounding good.
30
Equipment / Audio Processing
« on: August 20, 2014, 1528 UTC »
So, what sort of audio processing best for SSB broadcasting? I'm guessing 6Khz bandwidth (Or 10?) ALC & Compression?
