SOURCE: walky talky
A walkie talky as we called them, back when we were younger - and hell we probably still do in some respects, hence the fact my friend still refers to her cordless phone as a "walkie talky" and the principals haven't changed that much.
The common old Walkie Talky or CB radio use what we call a half duplex, that means only one person can talk at a time. We are talking and listening on the same channel.
Cell phones are full duplex, meaning two way conversation, and this is simply listening on one channel whilst talking on another, so the basic principal is basically the same, just a little more sophisticated.
Walkie-talkie typically has one channel
CB radio has 40
channels.
Cell phone can communicate on 1,664 channels or
more!
I have included a link to a circuit diagram.
http://www.freeinfosociety.com/electronics/schemview.php?id=1870
There is also two links below, building the transmitter & receiver.
Transmitter: http://www.zen22142.zen.co.uk/Circuits/rf/2bjttx.htm
Receiver: http://www.electronics-tutorials.com/receivers/regen-radio-receiver.htm
Trust this helps, and please take the time to rate the answer given, thank you.
SOURCE: My Binatone Marina 300 Walkie
Hello andy300,
Does the "RX" indicator show on the LCD screen constantly?
This radio does have a monitor function which disables the squelch control, allowing the user to listen to weak signals on the channel. Enabling this function in absence of any signals will cause the user to hear any background static or noise on the channel. You enable this function by pressing Menu + Up at the same time and disable the function by pressing Menu.
I assume that you are familiar with this function from the fact that you mention these keystrokes have no affect on the radio's behavior.
It is possible that the area you are using the radios in / channel you are using them on has a very high noise level. If the noise level is higher then the radio's automatic squelch threshold, then you would hear constant static, hiss, or white noise and the receive ("RX") indicator would show a constant signal. A local noise level can be caused by atmospheric conditions or very busy nearby adjacent-channel radio signals.
Try operating the radios on a different channel and see if that helps. If it is practical, you might try operating the radios in a different local area just to see if that has any effect at all. This would help you determine if the problem was a local one specific to the area you are operating in.
If it is local area related you might consider switching to a different model of radio that includes a Continuous Coded Squelch System (CTCSS) function (called "privacy codes" or "quiet tones" by come manufacturers. This function does not appear to be included in the model you are using and can help keep your radios silent unless you receive a call from another radio using the exact same privacy code.
If the problem persists regardless of channel or area, then you might have a problem with the radio that would require factory service.
Hope this helps. Best regards!
Ken
Go Ahead. Use Us.
SOURCE: Motorola FV200 Walkie-Talkie
Scanning Channels
Use scanning to monitor channels for transmissions or to find someone
in your group who has accidentally changed channels.
1. Short press MENU until the "Z" appears. The current setting
On/Off will flash.
2. Press either + or – to turn On or Off.
3. Press the PTT to confirm or MENU to continue set up.
Here is a link to the manual http://www.motorola.com/mdirect/manuals/FV200_userguide.pdf
SOURCE: I need a user manual for the Motorola T5522 two
Here is a link: http://www.giantintl.com/ContentManage/manuals/Moto/T55xx.pdf Have a nice weekend.
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