Police Scanner: Equipment Autopsy #68

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thegeekgroup.org/ - We explore the worlds of analog and digital radio as Chris opens up two different types of scanners. First is an old police scanner, which it tuned up by use of quartz crystal. It's followed by a more modern hand radio, which has made the switch to a completely digital setup. Watch to learn about the difference between analog and digital circuits, noise gates, a little about light polarization, and more!
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Опубликовано:

7 сен 2024

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Комментарии : 38

@william_k4arx 11 месяцев назад

Great explanation!

@william_k4arx 11 месяцев назад

I thoroughly enjoyed this. Gonna have to trim some scrap yards. I often see the popular shade tree mechanics stumble across old vehicles with a number of CB radios and antennas. Nice catch on the Regency. I found one just like that in an old rummage store, took it home but never had the chance to experiment with it. Scanning analog is still great fun even today!

@giammyzanna 10 лет назад

Analog stuff is always awesome haha

@GunitForLyfe 10 лет назад

really cool

@KORVEOS 10 лет назад

i have the icom ic-r6... Love my Icom!

@theultradramaking 10 лет назад

most modern Ham Radios such as the Icom IC-R5 use a VFO/DSP a variable frequency oscillator coupled with one or more IF frequencies

@ajwilson605 4 года назад

PLL circuits have been around since the '70's and were used in 40 channel CB radios. Most 23 channel CB radios used "frequency synthesis" to obtain TX and RX frequencies. This amounted to mixing the outputs of 2 crystals and using a harmonic of the 2 frequencies to obtain a 3rd frequency, that combined with the IF frequency, allowed the radio to TX or RX. All basic math and electronics. The math can be done through dual conversion radios with different IF frequencies. Wait until you try to diagnose a radio with 4 IF frequencies.....!

@chaseeller4545 10 лет назад

The bar antenna is normally used for receiving FM and AM broadcast band things. A larger antenna is not needed due to the power of the broadcast signals.

@piranha031091 10 лет назад

Chris, ferrite is actually sintered iron OXIDE, not metallic iron. The point being that it is both ferromagnetic AND non conductive. So that when you place a ferrite core in a coil, alternating current in the coil won't induce electric currents in the ferrite, that would otherwise heat up and absorb energy from the circuit.

@GoldplatedDeagle 10 лет назад

a cool thing you can do with the LCD is put it up to a old tube tv and turn it on and off and the static will light up and show what is printed on the LCD.

@kenberscheit480 4 года назад

42.5mhz was the highway patrol ,state of minnesota

@creativeguy1138 4 года назад

I have an old police scanner. I want to know if it's possible to open up one and convert it to digital or at least plug something into it to get it to play digital out of it's speaker? I love how the old scanners look. The red flashing lights and all.

@RSTPhysics 10 лет назад

The reflective back layer is also polarizing, so you could just take that after you've peeled it off and turn it 90 degrees to make it black/inverted. :)

@dash8brj 10 лет назад

I've done this trick many a times - even to oldskool cellular phones. I also have an icom, but its a TX as well as a RX, with a DSP, so no crystal oscillators in that one (well I guess except for the IF's - one of which is a ceramic 455khz osc). It'll do 100W on every ham band up to 2m :)

@kd1s 10 лет назад

What you'll find is most of the crystals you have are probably around 150MHz. which is where most EMS lives. Cops all moved to trunked systems a few years ago.

@ljmike1204 10 лет назад

looks like the cristal you put in a RC vehical

@latex653 10 лет назад

i own three crystal scanners they are radio shack models two of the three still work

@sparkyprojects 10 лет назад

My first ham radio was a Pye Cambridge (as used in taxi's etc) which had crystals for TX and RX, worked really well, also, maybe that scanner would be better for the roofcam audio so we don't get that noisy station, just needs the right crystals and cleaning of the controls.

@Mankysteve 10 лет назад

I used to fully know how LCD works but it all down to liquid crystal twisting when voltage is applied to them, this twisting blocks light polarized by the polarizing filter or at least that what i remember

@Nuker-jc6qo 9 лет назад

I got the same thing

@KuDeGrasBonVoyage 10 лет назад

WHat about the good ole foil, lots and lots of foil... would that work for a antenna ?

@JessicaKStark 10 лет назад

You should talk about Vacuum Fluorescent displays sometime. I want to do some stuff with them, but I'm not quite sure how.

@MysticalDork 10 лет назад

Send me a private message, I might be able to help you with that.

@gatesmw50 5 лет назад

Sometimes they work, but it's been my experience that the receiver sensitivity on these old boat anchors is poor to non existent Typically, with my service monitor I have measured 0.7uV to 3uV VHF Hi band. Or completely dead. I revived an AOR-2800 by putting a preamp before it which got me to 0.4uV. Not great, but serviceable for local monitoring.

@cmvb69 3 года назад

So I have a bearcat scanner that from what I understand, I have to do a formula to get the right crystal to put in which is where I'm confused, if I wanted the frequency 147.345 any idea what crystal I need ? Anyone ?

@drusle6 10 лет назад

"Better unplug that for safety" while working on a metal work bench with electricity. lol Now to get back to work on Napoleon Dynamite's time machine, I had a sneaky suspicion he was using the wrong crystals..

@tahoe32 10 лет назад

Haha,,,I still have one of those older scanners operating at my house!

@WiZeR911 10 лет назад

The clicking... aaagghhhh

@dang6369 3 года назад

Do these still work with new police radio frequencies? My dad has one that I'm using right now but it doesn't seem to be picking anything up.

@ChaoticGoodChris 3 года назад

They won't work with most modern systems, no. Anything digital or trunked is right out.

@SamSitar 10 лет назад

what was that pink strip above the ferrite bar antenna?

@MysticalDork 10 лет назад

the pink strip is actually a coil of super thin wire wrapped around the ferrite bar. The coil is the actual antenna pickup, the ferrite is just to get the right resonant frequency range.

@william_k4arx 11 месяцев назад

It's the AM antenna for low band/MF reception

@Broadcast1Channel 9 лет назад

Maby the title should be equipment massacre rather than autopsy. Especially when you compare this to the standard of Daves taredowns on the eevblog.

@ChaoticGoodChris 9 лет назад

Broadcast1Channel We have our own way of doing things. If we were going to try and emulate someone else's style or ethos perfectly, what would the point of making our own videos be? Obviously you do not have to like how we do it, but really, what are you asking of us when you make such comparisons?

@Broadcast1Channel 9 лет назад

thegeekgroup It is just that I don't understand the mess the Icom ended up in just from the act of taking it apart. Autopsy suggests careful disassembly and analysis of the device. I am not expecting you to have the equal expertise and knowledge as some other people on other youtube channels. The comparison I was trying to make was with the quality of act of disassembly undretaken. OK some equipment has cases that are physically sealed shut and the only way is to break in to them. But with any tinkerer geek part of the enjoyment and challenge of reverse engineering, is the art of descending the secrets of how a device is assembled and disabling it with little or no damage.