HFU HF Underground
General Category => General Radio Discussion => Topic started by: KRoc on October 27, 2012, 2238 UTC
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http://soundcloud.com/kroc-2/124350-1
http://soundcloud.com/kroc-2/129650-1
http://soundcloud.com/kroc-2/205-usb
Very curious..
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I may be incorrect, but I believe those are paging related.
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I think the first one might be, but I'm not sure about the last two. But paging? Seriously? Who pages these days? I suspect something sinister.
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It might be helpful to note the frequency and mode where you found these. The first one definitely sounds like a paging system.
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#1 definitely sounds like a pager. It will sound better if you listen in FM. If you have another receiver, hunt around 150.8 - 162 MHz and see if you can find one that's the same. Hopefully this (and #2) are just images in your receiver. If not, the FAA will be upset.
I've heard #2 millions of times before. Don't know what it is, but we've got this thing around here. Listening to it right now on 452.29375 MHz. It ID'd (every 15 mins) and its callsign is KNHV797, which is Suburban Taxi here in Minneapolis/Bloomington, MN. The FCC lists them at 452.3000 MHz, so perhaps the FCC isn't up to date (e.g. recent upgrade) or the RTL-SDR is off frequency.
Was #3 on 205 kHz? If so, might be some PLC or other data monitoring system.
And paging is still in use. Saw someone carrying a Motorola pager just a couple of months ago, of the same type I used to carry 10+ years ago. Could feel my blood pressure rise just looking at it.
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#1 is definitely pager signals. If you're hearing them on 124.350, then you either have a nearby paging transmitter that is bleeding over onto the air band or a receiver which is being overloaded by that same nearby transmitter.
#2 not sure about, but could be just about any electronic device sending out unwanted signals. I have heard something similar before which I later identified as a signal sent out over the cable TV cables so they could identify leaks by DF'ing it. However, I believe that I always heard it somewhere on 108 MHZ. If you drive around your neighborhood and keep hearing it everywhere you go, chances are good that's what it is. If you hear it very strongly on an FM receiver while holding it next to cable TV cable, then that's definitely what it is.
#3 I have no idea.
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To this day doctors still use pagers because they are much more reliable than cellphones in emergencies.
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#3 is a carrier current signal.
As a LW listener, I heard that frequently in the 80's when the "plug in and control" fad was all the rage >_<
#1 - I'll add my vote for pager.
#2 sounds like my computer through a scanner.... but you said it ID'd itself, so can't be CPU clock rubbish ???
Peace!
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That was my first time evar posting on this forum. I am so intensley happy that I finally have people I can ask questions to! I'm such an amateur though, that even half the stuff you guys posted is a total mystery to me but I look forward to learning more.
This is probably a dumb question, but how and where did you guys learn all this stuff? What's a good resource for newbies who aren't very smart but are completely fascinated by radio?
I'm just using a Grundig G3 world traveller so obviously my range and capabilities are going to be limited.
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For basic radio theory, buy a copy of the ARRL Handbook. It doesn't have to be new; a five year-old copy would do just fine. The ARRL has lots of other books available on many other radio topics. www.arrl.org
For a lot of info on pirate radio and other shortwave topics, there is a Wiki at www.hfunderground.com.
There are a number of radio-related channels on the IRC network starchat.net, where many of the people who contribute to this board hang out. You can ask questions in real-time there. Try out #pirateradio, #swl, #wunclub, #mwdx, among others.
Of course, there are many other resources on the net, and there are also many clubs available. For instance, NASWA comes to mind at www.naswa.net, the North American Shortwave Association.
Good luck!
That was my first time evar posting on this forum. I am so intensley happy that I finally have people I can ask questions to! I'm such an amateur though, that even half the stuff you guys posted is a total mystery to me but I look forward to learning more.
This is probably a dumb question, but how and where did you guys learn all this stuff? What's a good resource for newbies who aren't very smart but are completely fascinated by radio?
I'm just using a Grundig G3 world traveller so obviously my range and capabilities are going to be limited.
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Definitely join us in the #pirateradio chatroom; just click the big link you see at the top of the forums here (you have to be logged in to see the link).
I would also recommend subscribing to Monitoring Times or checking out any of the myriad of related yahoogroups.
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That was my first time evar posting on this forum. I am so intensley happy that I finally have people I can ask questions to! I'm such an amateur though, that even half the stuff you guys posted is a total mystery to me but I look forward to learning more.
This is probably a dumb question, but how and where did you guys learn all this stuff? What's a good resource for newbies who aren't very smart but are completely fascinated by radio?
I'm just using a Grundig G3 world traveller so obviously my range and capabilities are going to be limited.
I third what Fansome & Beerus said.
The big thing is to listen & research.
Also check out RadioReference.com (http://www.radioreference.com)