put me down as a customer
Kevin Custer wrote: > Hi All, > > You may remember the thread on audio quality a while back. One topic > was a replacement module for the stock audio processing circuitry > which is a major cause of limited audio bandwidth from some > manufacturers and models of equipment used to build repeaters and > links from. Some time ago, a prototype boards were built, sold and > tested to finalize the hardware design and verify circuit performance > of this new Audio Processing concept. I am happy to announce the > revised edition of the Audio Processor (clipper/filter) module from > Repeater Builder. We are tentatively calling it the AP-50 > > The new product is mostly surface mount to minimize size and allow an > installation concept similar to the Com-Spec TS-64. The product can > be used stand alone in existing repeater/link applications, or, > available as an option for use directly with modern repeater > controllers. The Arcom RC-810 is one such product that will > accommodate the RB module to allow infinitely adjustable audio > processing, per port. If you haven't heard about the Arcom RC-810, > don't worry, you will. > > We are working with an American board house and hope to have available > product for Dayton 2005. > > Details on the AP-50: > > Description: > This is a Audio Processing Module to replace the "Blob" or stock > clipper/filter sections in Two-Way FM radio transmitters. While this > circuitry was designed for use in a repeater or repeater controller, > it could be used to feed a modulator directly from a discriminator > source like in cross band repeaters or links. The module has 3 > controls for setting the amount of clipping (processing), the cut-off > frequency of the low pass filter (bandwidth), and the amount of > deviation. The module also has jumpers to 'program' the type of audio > feeding the module, and what feeds the modulator. The jumpers allow > either pre-emphasized or normal audio to feed the clipper, and allow > either de-emphasized or normal audio output to feed the modulator; > which accommodates either a FM or PM exciter to be properly > modulated. The low pass filter has an elliptic response created by a > switched capacitor filter to provide 'brick-wall' filtering. The > cut-off frequency is set by adjusting a potentiometer. The > approximate cut-off range is between 2500 and 5500 Hz to accommodate > anything from 15 KHz spaced 2 meter pairs to 25 KHz spaced link or > auxiliary allocations. The module is capacitively coupled with 10 uF > Non Polarized capacitors on the input and output to ensure low > frequency response. The module has a 5 pin header to allow either a > connectorized cord for stand alone installations, or be plugged > directly onto a option connector in supporting repeater controllers. > > The module has a dedicated PL or CTCSS input after the processor to > insure proper low distortion modulation of "PL" tones. This input is > DC coupled and can be driven directly by modern CTCSS/PL modules like > the Com-Spec TS-64. > > Concept: > The module is used to process audio feeding a FM or PM modulated > transmitter. Many times the stock audio processing (clipper/filter) > section of a transmitter can limit the audio bandwidth of the system. > By using this module, a set-able frequency bandwidth is obtained in > addition to amplitude limiting. A custom integrated circuit is used > to do most of the processing, including amplitude limiting and > set-able frequency filtering. The custom chip is provided voltage > from an on-board regulator to ensure stable operation. A second > integrated circuit op-amp is used to buffer the output of the custom > chip to drive low impedance modulators directly. > > Specifications: > Power Source +11 to +16 VDC > Board is Reverse Polarity Protected > LPF Cutoff Frequency - 2500 to 5500 Hz. > Frequency Response Less than 50 Hz. to 90% of Fc - +/- .25 dB Typical > Minimum Audio Input Level 200 mV P-P > Input Impedance approximately 10 K ohms > Output Impedance approximately 100 ohms > Maximum Audio Output Level 8 Volts P-P > LPF Rolloff -30 dB at 144% of Fc > Very Low Distortion and Group Delay > > Features: > Brick Wall Filtering > Dedicated PL Tone Input > Wide Frequency Response, great for "Flat Audio" repeaters and links, > or standard ones > Low Power Consumption > Adjustable Clip Level (level of process), LP Filter Cut-Off (audio > bandwidth), and Deviation Level (loudness) > Small Size (about 1.2 X 1.8 inches) > Simple to hook-up and set-up > Board is reverse polarity protected > > > Stay tuned for more information on this new exciting product from > Repeater Builder. > Repeater Builder (the company) is a subsidiary of Zimmerman Electronics > > Kevin Custer - M. Scott Zimmerman > > > > > > > > > > > > > > > ------------------------------------------------------------------------ > Yahoo! Groups Links > > * To visit your group on the web, go to: > http://groups.yahoo.com/group/Repeater-Builder/ > > * To unsubscribe from this group, send an email to: > [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
