Re: [amsat-bb] Intermod help

[Anthony Monteiro <aa2tx@xxxxxxxxxxx>]

Hi Antonio,

These preamps have no front-end filtering
so they overload on the 2-meter transmit signal.
A simple solution is to put a VHF/UHF duplexor in
front of the preamp. I use a Comet CF-416C
which has N connectors and can handle 500 Watts.
You do not need to terminate the VHF port.

73,
Tony AA2TX

At 03:00 AM 1/16/2004 +0100, Antonio wrote:

>I¥m suffering heavy intermodulation when working mode J satellites .My
>antennas are a pair of WIMO X-Quad..when TX on VHF..the UHF side goes
>deaf..I have a preamp in the UHF line (a MUST with my long coaxial lines) of
>quality from SHF Elektroniks /Germany),..When working mode B (TX on UHF and
>RX VHF ) all is nice with QSO`s on AO-7..,,but what a hell on FO-29 for me°°
>Question is if there are some home-made filter solutions considering that I
>use the UHF side also in TX for uplink to AO-40 and mode B satellites
>(AO-7)..so I must transmit also on UHF through the filter..
>Many thanks for the help.
>
>73,s de Antonio (EA1IW)
>AMSAT-EA 259  AMSAT-UK 5435 AMSAT-NA 33945
>afesan@teleline.es
>ea1iw@amsat.org
>antonio.fernandez@ono.com
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