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Re: Popularity of 2m I.F.



I had thought of doing that before with the old DEM Mode-S downconverter-- 
let us know how well it works...

Fred W0FMS


>From: "Pieter Ibelings" <rfspace@yahoo.com>
>To: <amsat-bb@AMSAT.Org>
>Subject: Re: [amsat-bb] Popularity of 2m I.F.
>Date: Wed, 30 May 2001 12:57:25 -0400
>
>Today I decided that I don't want to mess with a 2 meter IF if possible. I
>am tired of having to switch converters and radios on the 2 meter side.
>There is also the risk of keying the radio while trying to work 2 meters on
>another satellite. To solve this situation at my house I am going to use a
>50 MHz IF since I do not operate 50 MHz too much.
>
>Here is what I plan to do tonight:
>
>All of my 2401 down converters use a 94 MHz crystal that is multiplied by 
>24
>to produce 2256 MHz for the LO.
>
>This gives you 2401 - 2256 = 145 MHz
>
>Now, if you take some of the original 94 MHz signal and pass it through a
>mmic to get 7dBm or 13 dBm of signal at 94 MHz and feed it into a mixer, 
>you
>can mix the 145 MHz IF down to 51 MHz which falls right on the 6 meter 
>band.
>The image rejection is not hard to achieve this way.
>
>This gives you 2401 - 2256 = 145 - 94 = 51 MHz
>
>The only problem that I see with this approach is that if you transmit on 2
>meteres you might interfere with the downconverter some. You  can at least
>transmit on 2 meters and not blow anything up.
>
>PIeter Ibelings
>N4IP
>
>
>
>
>----
>Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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