I see what the sales flyer says, but the response plots show no real bandpass action. Indeed, the plots depict exactly how a notch-only duplexer responds. In fact, the plots look faked, IMHO. I have tuned many duplexers over the years, and none of the plots look so "perfect." If Fiplex duplexers are so great, why aren't they used by large state patrol systems? Is there a list of satisfied customers? Maybe I'm just too cynical, but I think the specs for those duplexers are just too good to be true. I'm going to keep my money in my pocket until I see some credible evidence that these duplexers perform as advertised.
73, Eric Lemmon WB6FLY -----Original Message----- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Joe Sent: Monday, July 05, 2010 4:18 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] MASTR II LOW BAND TUNING The spec sheet shows them to be bandpass/band reject. >From the document: These duplexers utilize six high Q (helical) resonant cavities, interconnected in a band pass-band reject configuration which allows close spaced transmit-to-receive frequency operation. Joe On 7/5/2010 6:33 PM, Chris Curtis wrote: They are notch only devices and I've used "similar" devices using that helical design for years.
