I agree with Wayne. I added a 2.1kHz INRAD filter on the receive side, and a Collins mechanical filter on the transmit side. The receive improved tremendously, even the DSP works better, and my local friends tell me the transmit audio sounds more natural. I've never used a '910, so my observations are strictly relevant to the '847. 73, Jim KQ6EA
--- On Fri, 5/29/09, Wayne Estes [email protected] wrote:
From: Wayne Estes [email protected] Subject: [amsat-bb] Re: FT-847 vs IC-910 To: [email protected] Date: Friday, May 29, 2009, 10:00 PM Not all FT-847's are alike. A stock FT-847 has wide, low-Q ceramic IF filters. My FT-847 has INRAD CW and SSB crystal filters that give narrower IF bandwidth, with MUCH higher Q. I haven't compared them, but I suspect that a FT-847 receiver with quality IF filters performs roughly on par with an IC-910.
If shopping for a used FT-847, look for one with optional IF filters. Collins mechanical filters are an improvement over the stock ceramic filters, but crystal filters are even better.
Wayne Estes W9AE Oakland, Oregon, USA _______________________________________________ Sent via [email protected] Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb