![icom ci v schematic icom ci v schematic](http://www.ka1mda.org/ham/homebrew/civ/civ3.gif)
You are on your own here!įigure 3 shows the complete interface schematic.
Icom ci v schematic serial#
A normal 9-pin or 25-pin DBconnector attaches to thecomputers serial port.Like most of these interfaces,getting the hardware built andconnected is only part of the task convincing the software in thecomputer and the radio to speak isusually much more frustrating,especially if you have not done itbefore with a given program orrig. A standardminiature (1/8") mono phone plugconnects to the radios CI-Vport. Icom uses a unique system withbidirectional control (with multi-radio capability) through a singlewire (plus ground). You could probably derive the negativesupply from the serial port and eliminate the 555 charge pump.
![icom ci v schematic icom ci v schematic](https://www.channypicture.com/pic/imgsgroup1/M00/21/B3/D282D697568C8BF68D4A9A23CFCF93D627BDF393B666C6958B67452EB0BE26B087F614BE77B8A695A69BA794478D15CECACEF523.jpg)
Since power is already available from the band decoder port, noattempt at self-powering through the RS-232 port is made. A 555 timer is used as an oscillator and charge pump toproduce the negative voltage. It uses a low-cost dual op-amp and a zener diode for level conversion. The CI-Vtocomputer serial interface schematic appears as Figure 2. D2 prevents reverse current flow from the relay into the rig. Its value might need tweaking for individual LM3914s and differentsupply voltages. R2 compensates by providinganother path for this current. LM3914 funnythe first output draws several hundred microamperes of current even when theother outputs are selected. Q1 and D1 act as a level-shifter, raisingthe zero-volt 30m level about a volt so that the first dot is active.
Icom ci v schematic driver#
Note that no base current limiting resistors areneeded for the output transistors: the LED driver functions as a current source which provides theneeded base current limiting. It is used in its moving dot mode instead of the bargraph mode, so only one output is active at a time.
![icom ci v schematic icom ci v schematic](https://www.qsl.net/g3vgr/images/Civ011pcb.jpg)
The LM3914 is designed as an LED bar graphmeter for low-cost consumer audio electronics. This band voltage varies from 0V for 30m to over 7V for 160m (see the Table,below, for values measured on my particular rig). The band decoder takes three inputs from the Icom rig: power, a reference voltage of +8V, and theBAND voltage. Unfortu-nately, other WARC bands are not separated (12m decodes as 10m 17m decodes as 15m) becauseIcoms voltage level scheme uses the same voltage for these band pairs. So much for uniqueideasat least this means this design should be easy to duplicate and get running for other builders!One major difference from the commercial design is that Figure 1 properly decodes 30m. Then came the April (1997) NCCCmeeting: N6TV brought in his OH-made solid state DXpedition kW amplifier, and there in thediagrams was an Icom interface virtually identical to my clever circuit. When I designed it, I thought I was being reallycleverusing an IC designed as a consumer-audio output meter as an analog-to-digital converterwith an external reference and controlled-current output drivers. The CI-Vinterface allows rig control via computer, and makes logging programs like TR-Log and CT reallyshine.įigure 1 is the band select driver portion schematic. The band output port drives things like relay-switched DuneStar band filters(Model 600, for example), remote coax switches, etc., and does not require a computer. This project is an interface box for Icom rigs that includes a band output port and a CI-Vtocom-puter serial interface. Automatic Band Select and SerialInterface for Icom HF Radios