Field Report Kit
| Project: Field Report Kit | |
|---|---|
| Featured: | |
| State | Stalled |
| Members | PsychiC, xopr |
| GitHub | No GitHub project defined. Add your project here. |
| Description | Field Report Kit |
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synopsis
If we want field reporting on the CCC camp, we quickly need a kit that provides us that service.
Our first option was to use the available wifi, but since the link quality is unsure, we asked CoolePascal for a possible solution. He opted for the PMR 446MHz with boosted power and bandwidth. Since we only have a couple of weeks left, and our video transceiver kits were unusable, we're taking the shortcut by connecting a reporter kit directly to a DECT handset.
implementation
transmitter
- use a DECT handset
- solder a 3.5mm 4p jack contra (TRRS) onto it, according to the Nokia standard: 1-Left, 2-Right, 3-Mic, 4-Common. Note that iPwn has the Gnd and Mic mixed up.
kit
- create an amplifier for reporter feedback, and connect the jack to the kit using a poor-man's mixer (i.e. resistors)
The kit still needs some work (see todo), but it should work like this:
- left socket is an unbalanced 6.3mm jack/XLR combo connector to connect a dynamic microphone to it
- right socket is the 6.3mm headphone connector
- (todo) potentiometer defines the feedback volume
- switch powers the kit on/off (displayed by the led)
- (todo) 3.5mm TRRS plug connects to the transceiver (DECT/GSM handset)
todo
- create a working connector, preferably 4p 3.5mm jack contra to a DECT handset
Note that impedance and amplification and the like might not be optimal for connecting a dynamic microphone and headphones to the handset
- connect the TRRS plug to the kit using resistors (TBD)
- connect the potentiometer before the amplifier (check if it has impact on the transceiver signal)
- acquire 9v batteries
