Re: [Repeater-Builder] Re: GE Mastr II PLL vs. Multiplier (crystal) exciterin duplex service.

[Kevin Custer]

[EMAIL PROTECTED] wrote:   I think GE realized that the old multiplier highband exciter needed a design revisit, and chose a PLL version over a conventional multiplier for more reasons than just enhanced noise performance.  The PLL version requires very little tuning, thus reducing labor and overall cost.  I'm certain that they could have developed a "multiplier" version that exceeds the noise performance of the PLL unit, had they chosen that route. The PLL exciter was designed for several reasons, one being FM in nature it worked correctly with emerging digital technology like DPL and other digital signaling. Secondly, it would operate (properly and without degradation) over 17 mHz of bandwidth without retuning, something a "multiplier" exciter cannot do.  Motorola built radios with two exciters to cover a large operational area, certainly not a very cost effective approach.  The Mastr II PLL was certainly cheaper to produce, in materials and labor.  I think the phase noise advantage was an added aside, and was likely not the intended need for the redesign. Kevin Custer 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 the Yahoo! Terms of Service.