- An 800mW experimental power amplifier for 2.3GHz
- 'A' class 18W power amplifier for 1250 MHz
- Single cpu controller board for monitoring up to five
ERICSSON Compact 9000 UHF amplifiers
|Ericsson C-9000 70cm
280W PA controller interface
* release info v1.00 7. May 2005 *
ECI-5 is a single microcontroller interface capable of live monitoring and alarming various unwanted Power Amplifier (P.A.) states via onboard Relay, or thru serial port. ECI-5 is based on a slightly modified CX-13 pcb. For the purpose to control up to 5 P.A.’s, the 5th I2C bus was added on board. Onboard FLASH cpu can be easly uploadet with new software via SPI bus, at any time.
Oboard 2x 40chr LCD display and keyboard are used only for brief monitoring,
while major controling and maintenance power is on serial port. This port
(19200 BPS 8N1) can be connected directly on to any VT100 compatible terminal,
or to PC COM port using simple terminal software, or LAN, WLAN for remote
access. Also on to AX25 TNC like devices, etc. System uses simple ASCII
line commands for controling. Communication port uses only 3 wire cable
(RxD, TxD and GND).
Board produces Beeps at keyboard pressing, plus software has anti_breach function build in, thus allowing use of any kind of buttons. Functions on four buttons of ECI-5 keyboard are:
ECI-5 software runs as complex multitasking operating system, where some crucial tasks like triggering alarm flags runs independetly in own processes. System runs on 4MHz cpu clock and is still capable to download data, calculate, and finaly trigger alarms for up to 5 P.A.’s in less than 1/3 of second. While same time monitoring onboar Keyboard, maintaining serial communication direction PC, terminal, WLAN or AX25 modem .. and also displaying main data on 2x40chr. LCD. To grab, calculate and display all posible data via RS232 it takes less than 2s for all five power amplifiers. Software also generates segment driving voltages for LCD (from cca -2.5 up to +2.5v). Therefore any 2x 40 Hitachi compatible LCD will work errorless, plus LCD Contrast is adjusted via software, not using any trimmer resistors. If the LCD has an LED background light, the intensity of light can be adjusted via software too (three steps, plus light_off).
ECI-5 software has wide range of automatics build in. After uploding Flash it automaticly detect 1st run and initializes system variables with default values. If there is an I2C error (or P.A. not connected) it will report I2C bus error, but not trigering other alarms on this device, even they exists due to missing or false data flow from P.A.comm. lines, etc. User can determine how many of amplifiers would like to controll, up to max. five. Software automaticly readjust LCD and RS232 printouts on to desired number of informations.
Comands via serial port are single letter and are case sensitive
- only UPPER CASE letters are valid ! There is no system prompt,
and no response on false command entry built in. Comand ‘H’elp will display
main menu with brief explanation, folowing by variable setting (on few
of them). There is no group Save command available. Each seting must
be saved alone. System will operate errorless without saving new limits,
too. But their curent values are lost after power failure or system restart.
System restarts everytime with values stored in internal EEprom.
Download preliminary user manual ECI-5
Compact 9000 - Modifying a 280W high power
amplifier for 433-440MHz
|These C9000 amplifiers were used on POCSAG paging network in Germany
on 448 MHz. They can be easly converted on to 433-440 MHz band. In HF stage
man would need to add two variable caps 1.5-16pF to extend the input transformer
On output add 5pF ceramic caps behind each high qualiy trimer cap. For
adjusting use UNI13P cpu board with "c9000" software and 4x20 LCD. This
device will display PWR/SWR and other data. It will ALARM bad SWR (grater
than 2.7) with beeps & ERR LED shining (PA.3), plus same output drives
an NPN o.c. transistor for TX disabling. PB.0 is used for ERR MEMORY mode
switch + pushbutton (parallel). If shortcuted to gnd ("0") there is no
ERR memory available - ERR bit will be reset after TX goes OFF . If left
opend - logical "1" the ERR status remain active. Only shortly presing
on pushbutton will clear ERR status - enabling TX to go on the air
For FM mode:
Aditional modifications for SSB mode:
- Up to 200w continuously 24/7 (FM)