[BC] mechanical filters

[Donald Wilson]

Collins mechanical filters are still used in several current amateur radio 
transceivers, usually as optional upgrades from standard ceramic filters.
Most of the newest designs use DSP circuits at low IF frequencies instead.
 
Donald Wilson
K6DSW
North Hollywood, CA

----- Original Message ----
From: Chuck Lakaytis <chuck at akpb.org>
To: Broadcasters' Mailing List <broadcast at radiolists.net>
Sent: Monday, April 23, 2007 9:57:23 AM
Subject: Re: [BC] IBOC "secrets" and my opinions.


Worked on many a Collins R-390.  I really loved the R-390A.  That box used 
those wonderful mechanical filters for selectivity.  I wonder if that 
technology is still being used.

Chuck Lakaytis
Director of Engineering
Alaska Public Broadcasting, Inc.
135 Cordova Street
Anchorage, AK 99501
907 277 6300
907 277 6359 FAX
907 301 4339 Cell
----- Original Message ----- 
From: "Mark Earle" <mearle at mearle.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Sent: Saturday, April 21, 2007 4:40 AM
Subject: Re: [BC] IBOC "secrets" and my opinions.


>> control at the transmission end. That's just for the AM.  A Collins R-390 
>> comes to mind as a place to start!
>
> The R-390 could ride in the wagon with a small generator for "portable" 
> operation :-)
>
> -- 
> mwe
>
>       ) )
>      ( (
>       ) )    You will be assimilated... oooh, coffee!!
>    _|****|
>   ( |    |
>    `|____|   mearle at mearle.com
>
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