I took a quick look at them, and what stands out like a sore thumb is 1.6 db
insertion loss with a 150 watt power rating. That means they'll be
dissipating close to 50 watts in such a small package. Doesn't give me a
warm and fuzzy feeling...
--- Jeff WN3A
> -----Original Message-----
> From: Repeater-Builder@yahoogroups.com
> [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon
> Sent: Monday, July 05, 2010 8:02 PM
> To: Repeater-Builder@yahoogroups.com
> Subject: RE: [Repeater-Builder] MASTR II LOW BAND TUNING
>
>
>
> 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-Builder%40yahoogroups.com>
> [mailto:Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.com> ] On Behalf Of Joe
> Sent: Monday, July 05, 2010 4:18 PM
> To: Repeater-Builder@yahoogroups.com
> <mailto:Repeater-Builder%40yahoogroups.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.
>
>
>
>
>
>
>
