The logger also provides a 2.5 V reference output. The AC voltage measurement circuit feeds a logger that has a maximum input voltage rating of 2.5 V. The value of R2 can vary widely depending on the application but consider that the OPA333 op amp used here (U2) is specified for a 5mA output current maximum.Īn example of the implementation of this clamp is shown with the AC voltage measurement circuit it was originally created for ( Figure 2).įigure 2 Clamping circuit shown with the AC voltage measurement circuit. R2 acts as a series resistance for the clamp action of the amplifier output. Wow the engineering world with your unique design: Design Ideas Submission Guide The use of four identical-value resistors makes achieving accuracy easy because of the ready availability of precision ratio-matched resistor networks. Lastly, D5 in the output of the amplifier only allows the amplifier to sink voltage from the OUTPUT node if the level attempts to exceed 2.5 V. The sensed voltage is also halved via the divider formed by R5/R6 and applied to the inverting input. To achieve this, the reference voltage is halved via the divider R3/R4 and applied to the non-inverting input. This solution (see Figure 1) is based on a rail-to-rail op amp capable of operating at 2.5 V but, even then, operating the input and output nodes of the amplifier near the center of its 0 to 2.5 V range provides the best linearity.įigure 1 Clamp circuit to precision clamp a 2.5 Volt output while operating on a 2.5 Volt power supply. In addition, the signal requires a clamping voltage that is more precisely regulated than either device can provide.
Since the signal’s dynamic range is from 0 to 2.5 V, clamping it with a simple diode or Zener would eat up up too much of the signal’s range. Low-loss 4 foot (1.2 m) LMR100 RF adapter cable to safely connect a PL259 type antenna to the SMA antenna jack.Ĭopyright 1999-2020 Universal Radio, Inc.This circuit was born from an application that required an input signal to be precisely clamped to less than 2.5 V, while operating on a 2.5 V supply (actually a reference) with a maximum output of 4 mA. This RF adapter lets you connect a BNC type antenna to the R2's SMA antenna jack.
IC R6 VS IC R2 SOFTWARE
Windows 3.1/95/98/ME programming software and cable (DB9) for R2/R10 on 3.5 inch disk.
IC R6 VS IC R2 PC
This version is also discontinued.ĭOS PC cloning software on 3.5 inch disk (requires OPC-478). The IC-R2 -07 model is the same as above, but without the 824-849 / 869-894 MHz cellular gap and could be purchased via government or qualifying commercial purchase order or for export only. The other thing that is very small about the R2 is it's price! Your R2 comes with two NiCad AA cells, BC127A AA charging tray, flexible SMA antenna, wrist strap and belt clip. The efficient circuit operates on just two AA cells.
IC R6 VS IC R2 MANUAL
Both automatic and manual Squelch are supported and CTCSS decode is built in! Other features include: attenuator, LCD display with lamp, auto power off (30/60/90/120 mins.) and battery save.
IC R6 VS IC R2 PLUS
Plus you get an additional 50 band-edge memories. Each memory stores: frequency, mode, step size, duplex direction and offset, CTCSS tone, tone squelch and skip settings. It has 400 channels of memory (8 banks of 50).
The triple conversion circuit provides amazing sensitivity for the size.
It is especially big on coverage, tuning from 495 kHz to 1309.9 MHz (less cellular) in these modes: AM, FM Narrow and FM wide. At only 2.3"x3.4"x1" (58x86x27 mm) is it absolutely packed with features. The Icom IC-R2 is a miracle of miniaturization. Specifications | Accessories | Larger Photo Icom IC-R2 Wideband Scanner Receiver ICOM R2
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