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Posted: Nov 20th, 2008 07:11 AM |
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Gary_JP
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I've been a closet "researcher" for many years. Recently came upon the Rat Shack Hack and decided to take a look. I am a 20+ Broadcast Engineer, and have started up stations from the bottom up.
Just wanted a site that I could ask questions and hopefully give answers to a very new subject, hence my newbee status. I'm currently working on a Radio Shack setup that will include three 469's (or 470's) a white noise generator, two microphones, powered speakers, and a digital recorder or two (have a couple of sony mini-disk that I would like to incorporate) all going through a edirol portable 8 channel mixer.
I do have a some quick questions about the following:
1. Best type of "noise" (be it white, pink, or brown?) and if using a stereo mixer have one channel white the other pink?
2. If these radios have that click everyone is talking about, what is the way to sweep them with a added piece of breadboard?
Hopefully or eventually would like this to be a field unit, away from AC power and with a standby power source (have a few anton Bauer's that I pciked up over the years) Any help will be appreciated.
Once I get the way this site works, will start posting the results.
Thanks everyone, and let us all figure out who we are trying to connect to?
Peace.
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joecioppi
Moderator
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Gary,
Welcome and good luck with your experiments. I use a Philips TDA7088T tuner chip that has analog scan features and internal tuning noise mute. It's easy to scan with free running timer chips and is adjustable with a pot in the timer circuit.
I don't have the gear to reprogram RS Hack tuners to allow adjustable scan rates. My FM ghost box is called "Joe's Box"
joecioppi
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Slider2732
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Hi Gary...
Noise types, in my opinion are 'whatever works best' for the results you obtain. For a field unit, battery based, i'd say White would be the easiest and least power hungry. Couple of good transistors type of method. Or, quite often with the Dollar Tree $1 radios I use, you can get the reception negated and they output the white noise anyway ! 3V operation at a few milliamps can't be sniffed at. Joe's 7088 methods are quite similar and he goes much further than I have with the circuits It might be worth exploring such a chip to use its output with no radio reception coil etc. That way you negate any false radio transmission pickup on the output.
Unfortunately I haven't the means right now to get hold of a Rat Shack radio, but the click on the Dollar Tree ones was stopped by using a 10uf capacitor. Basically, being as the normally used 555 chip controls the rate of reset of sweep, connecting the capacitor smoothes the output. 555's are quite the strong switching device and their output gives that click effect. If it's the same sort of situation, that's how I quietened things lol
Couple of my threads might hopefully help for a field unit:
http://www.itcbridge.com/forum/view_topic.php?id=647&forum_id=32
http://www.itcbridge.com/forum/view_topic.php?id=444&forum_id=9
http://www.itcbridge.com/forum/view_topic.php?id=634&forum_id=31
and possibly the Anrede build thread, being as it's a field unit build
http://www.itcbridge.com/forum/view_topic.php?id=448&forum_id=19
Last edited on Nov 22nd, 2008 12:33 PM by Slider2732 |
Keith Clark
Administrator
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Hi Gary,
Welcome to the forum. We're glad to have your personal experience shared here.
Here's a post of when I originally tried the sweep hack of the radio shack radios.
http://www.itcbridge.com/forum/view_topic.php?id=509&forum_id=31
See you online,
Keith
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Posted: Nov 24th, 2008 10:32 AM |
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Gary_JP
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Thanks Joe, I've been "messing" about electronics since the early 70's, gotta say the technology has changed a whole bunch. Taking a look at bread board and trying to remember resistor color codes.... well, it's all coming back, glad I didn't eat that many rooms back then. I've read and heard about all the "ring ring" ghost on the line, may I take your orders, devices. It's taken off like wild fire. Seems that every turn someone thinks of a easy way? I'm starting to look for some micro farad types, and to locate my box of parts n pieces.
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Slider2732
Member
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Well here's one source of help hehe
http://samengstrom.com/nxl/3660/4_band_resistor_color_code_page.en.html
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joecioppi
Moderator
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Gary,
I tried 'I Ching' coin toss readings and have seen Tarot readings from randomly shuffled cards. When Frank Sumption used junction noise to tune a voltage tuned car tuner I realized that the common element was randomly occurring events. Random coins, random noise, random cards, and in my 'JoesBox'design a free running '555 timer selects a station on the Philips tuner chip the voice segment vocalized is a random event.
The trick of the mind rejects random events as meaningless, but results in paranormal methods says otherwise. The speech chip triggered by static noise can talk to the operator and even joke with them.
Joe Cioppi
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