I enjoy designing devices for use in the shack. The main picture shows an electronic touch paddle, a project I started in April of 2011. It utilizes an 8 bit Microchip RISC processor. Specification for the design are as follows:
Dit / Dash sensor sample rate = 870 uS.
Power consumption @ 9 VDC = 800 uA typ. approx 750 - 800 hrs with standard 9V battery.
Auto shutdown timer of 20 minutes when battery powered. Touching a sensor resets the shutdown timer.
For supply voltages > 10V unit stays powered up no auto shutdown.
LED status for power up, power down and low battery level.
No adjustments necessary. On power up a calibration is perofrmed of both sensors, approx 40 mS total. A momentary switch is used to power on/off the unit. Battery life is excellent due to the very low current consumption. I have not changed out my 9 volt battery in a year now. My usage is quite high.
Below is a picture of a single band tuner, 20M band, used to end feed the driven element of my 2el vertical wire yagi. It is capable of handling 2KW of power with extreamly low loss. Impedance transformation is 3000 ohms to 50 ohms.
Picture below is of a wireless antenna switch and rotator controller. Used is a Microchip PIC 18F26J11 programmable controller. The API is used in control of the DigiMesh modules. It uses a frequency hopping 250 mw 915MHz DigiMesh transceiver and has much greater range than the 2.4 GHz radios commonly used although a 2.4 GHz version of DigiMesh is available. Pictures of the Windows control program are shown as well. Data throughput on the wireless RS-232 communications port is 40 Kb/s with acknowledged packets. Due to use of mesh networking, repeaters can be placed to achieve greater range in very difficult communication path situations. This system is being used in a remote radio site here on Oahu.
My next project is to design an internet remote key. I want to use my beloved touch paddle when operating the remote station.
73's de Martin/KH6MB
Last modified: 2014-03-07 19:41:07, 2790 bytes
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