Related Manuals for LDG RVS-8
Summary of Contents for LDG RVS-8
- Page 1 RVS-8 Repeater Voting System Assembly Manual Ver 2.1 LDG Electronics 1445 Parran Road St. Leonard MD 20685 Phone: 410-586-2177 Fax: 410-586-8475 e-mail: ldg@radix.net Web site: www://radix.net/~ldg...
- Page 2 Multiple RVS-8s can be cascaded to provide up to 64 channels of voting. Building the Kit: The RVS-8 is a medium to large sized project (not for beginners). It may take the average builder several evenings to build, check out and align the voter (we averaged about 3 hours for assembling just the PC board).
- Page 3 Getting Started: Before getting the soldering iron out, go through all of the parts in the kit and familiarize yourself with each component and its placement. Most of the parts are common, but a few of them may be new to some builders.
- Page 4 14 pin connector is on the left. The red stripe on the ribbon cable should line up to the left side of the PC board (closest to U2 and the Contrast pot) and to the bottom of the LCD module. On power up, the RVS-8 will display the startup screens on the LCD to show that the microprocessor is running and everything has initialized successfully.
- Page 5 Ten-Tec Inc are available from LDG for $65 (plus shipping) . Switches 1-4 and LEDs 1-2 mount on the front panel. The toggle power switch, SW4 is the only switch that will have 12 volts on it. The LEDs just push through holes. Note the polarity of the LEDs, the flat side should go to ground.
- Page 6 The mode is not stored in Serial EEPROM and defaults to number mode on power up. The display is updated every second for either mode. Note: The Channel signal to noise ratio display can produce false readings if the input modulation exceeds about 4 kHz bandwidth.
- Page 7 (or vice versa). A typical value used may be between 3 and 6. In the RVS-8, the signal to noise ratio for each channel is represented internally by a number that has a value between 0 and 255, with a higher number meaning higher signal (better signal/noise ratio).
- Page 8 The two disable systems are “ORed” together. That means that if the software “or” the hardware has a channel disabled, the RVS-8 will disable that channel. Note that if the hardware has a channel disabled, the software can not enable that channel. The reverse is also true, if the software has a channel disabled, the hardware can not enable that channel.
- Page 9 Other Inputs and Outputs: Power Input: +12 volt power is supplied to the RVS-8 through J1. The actual voltage can be between +11 and +15 and should be regulated. Total current consumption is less than 300 mA. If voltage drops below 11 volts, the voter will still function, but the relay may not energize.
- Page 10 (such as a 1K resistor in series and .01 uf capacitor to ground to filter out higher frequencies) in the audio lines to properly match the different audio characteristics. Performance: The performance from the RVS-8 is excellent. As the QST article stated, when the system is set up and...
- Page 11 working right, you can’t tell the voter is there. We usually have the output selector connected to our repeater controller (all CAT-300s and 500s) to change the tail beep to different tones for identification of different site selections because we can’t tell which site is selected by audio alone. Since the audio actually only passes through one op amp and one analog gate, there is very little distortion compared to the original signal (much less than 1db).
- Page 12 As a last resort only, LDG Electronics will attempt to repair any problems. As much as we would like to do it for free, we just can't. We have a flat fee of $70 plus parts to repair an RVS-8 (most resistors and capacitors are included in that fee).
- Page 13 This will ensure that we have provided everyone with the best kit possible. We plan to have a small RVS-8 Newsletter to coordinate hardware and software changes, modifications, and other items that would be of general interest to users.
- Page 14 Audio In Op Amp with variable gain Audio Out Test Point Aud 1 High Pass Filter with gain and rectifier High Pass Filter Test Point A/D1 to uProcessor Audio In TP Aud 1 Pin 2 TP A/D 1 1 KHz 2 V p-p 1 V p-p 0.1 V...
- Page 15 J6 Output J2 Audio/ J1 Power J5 Audio In J4 COR IN J3 Disable In Select COR Out N/O N/C Com Audio Gnd +12 Gnd Gnd 8 7 6 5 4 3 2 1 Gnd 8 7 6 5 4 3 2 1 Gnd 8 7 6 5 4 3 2 1 Back Panel Connections.
- Page 19 RVS-8 Parts List Quantity Description Name 1N4148 1N4001 2N3904 SPDT Relay Red LED L1-2 Pushbutton SW1-3 Toggle 10 pf C51, C52 .0047 uf C17-40 .1 uf C1-8, C50, C53-54, C57-58, C100 1.0 uf, 25 or 50v C9-16, C49, C101-104 10 uf, 25 or 50v...
- Page 20 RVS-8 Update Notes Version 2.0 PC Board Version 2.1 Software Ooops. We missed a pull down resistor on the STRB line of the X68C75 chip (U2). A 2.2K resistor is provided with the kit to be used here (any value between 1 K and 100K would work).
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