And... that's interesting... I had always figured they used them cuz they
were cheaper. SOMEDAY I'm going to build my own somewhat-simple, very
band-optimized, small superhet receiver. I have several BUNCHES of crystals
I have gotten 50 or 100 of cheaply on ebay, that'll come in handy. Plus,
back when Collins introduced that new line of crystal filters, and would
sell you one for $25-$35 (as I recall) in onesies, I got a 200Hz (maybe a
little wider-I forget) from them with this sort of thing in mind. I'll file
away THIS piece of info for use in it, since I also have several ceramics
I've picked up over the years-and Hosfelt has all you could want.
At 08:35 PM 2003-05-17, you wrote:
>Thanks for this reference, Paul, which I unfortunately received and read
>after posting my previous response to you.
>
>Despite Mr. Inoue's statement of over two years ago that no new Icom
>products would use analog crystal or mechanical filters, it does appear that
>the 7800 reduces the roofing filter bandwidth to 6 kHz for all but FM
>operation.
>
>Mea culpa for passing along incorrect information, if indeed the 6 kHz
>filter is crystal or mechanical. The PROs use ceramic filters for roofing
>due to their lower insertion loss and lower distortion. Perhaps, the 7800
>does also.
>
>Interesting report - thanks again for pointing it out.
>
>73/72, George
>Amateur Radio W5YR - the Yellow Rose of Texas
>Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
>"In the 57th year and it just keeps getting better!"
><mailto:w5yr@att.net>
>
>
>
>
>
>----- Original Message -----
>From: "Paul Christensen, Esq." <w9ac@arrl.net>
>To: "Ten-Tec Reflector" <Tentec@contesting.com>;
><TenTec_Orion@yahoogroups.com>
>Sent: Saturday, May 17, 2003 6:54 PM
>Subject: [TenTec_Orion] Re: IC-7800 Product Literature
>
>
> > Also, look on page 5 of the IC-7800 product detail. It appears the
>IC-7800
> > uses a 6 kHz roofing filter in the first I.F for SSB/CW.....it is not
> > limited to a 15K filter like the 756PRO/Pro-II.
> >
> > The Specifications, rear panel photo and block diagram appear on page 4.
> > Here's the link again for those who missed my last post:
> >
> > http://qtc-japan.net/2001/03_news&topics/ic-7800new.pdf
> >
> > -Paul, W9AC
>
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73 Ed Tanton N4XY <n4xy@earthlink.net>
Ed Tanton N4XY
189 Pioneer Trail
Marietta, GA 30068-3466
website: http://www.n4xy.com
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