Don't you mean, kiloCycles?
On 5/21/05, Kevin K. Custer <[EMAIL PROTECTED]> wrote:
>
>
>
> >------- Original Message -------
> >From : Eric Lemmon[mailto:[EMAIL PROTECTED]
> >Sent : 5/21/2005 4:05:15 PM
> >To : [email protected]
> >Cc :
> >Subject : RE : Re: [Repeater-Builder] Poor Repeater RX
> >
> >Alexander,
> >
> >The
> >Sinclair Q-202G duplexer can barely make 85 dB when tuned on a network
> >analyzer, so that's the major part of your desense problem. It's only a
> >four-cavity duplexer, specified at 80 dB minimum isolation, so no amount
> >of tuning is going to make it operate at an isolation above its design
> >limit.
>
> While I don't disagree with what has been written, please realize that
> *most* commercial manufacturers 'rate' their highband/2M duplexer at 500
> kiloHertz split, not 600 kiloHertz where most amateur 2 meter repeaters are
> operated. This added frequency separation allows for the duplexer to
> provide more than the stated isolation at the 500 kiloHertz specification.
>
> The Wacom WP-641 is specified at 85 dB of isolation at a 500 kiloHertz
> split, but provides 93 dB of isolation at 600 kiloHertz. The Sinclair Q202G
> is similar in its factory specifications, and isolation provided.
>
> Kevin Custer
>
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