My experience so far is that the ARR preamps are terrible, very poor ability
to not oscillate or overload when around any high RF field, we use only TXRX
amps. So far, threw out 4 of the UHF ARR amps they make that were on
repeaters. Even 100db pass/rej. duplexers don't seem to allow the amps to
work correctly.
lance N2HBA
----- Original Message -----
From: "Brent" <[EMAIL PROTECTED]>
To: <Repeater-Builder@yahoogroups.com>
Sent: Monday, March 21, 2005 11:04 PM
Subject: Re: [Repeater-Builder] Desense, I'm guessing?
>
> Will do! Gone with just the Wp-643's nothing else.
> Thanks again for the info and of course the RPTIP info. which if I read or
> not I tend to always miss what im looking for.
> 73's
> Brent
> ----- Original Message -----
> From: "Eric Lemmon" <[EMAIL PROTECTED]>
> To: <Repeater-Builder@yahoogroups.com>
> Sent: Monday, March 21, 2005 9:59 PM
> Subject: Re: [Repeater-Builder] Desense, I'm guessing?
>
>
> >
> > For those who may not have the Wacom catalog handy, the WP-643 duplexer
> > comprises six 8" cavities that are rated at 102 dB isolation at 600 kHz
> > spacing, with 2.2 dB insertion loss. Four of the cavities are BpBr, and
> two are
> > bandpass only. The WP-639 duplexer comprises four 5" BpBr cavities that
> are
> > rated at 80 dB isolation at 600 kHz spacing, with 1.5 dB insertion loss.
> > Needless to say, the WP-643 is vastly superior to the WP-639 at 2m
> spacing.
> >
> > You could use two of the WP-639 cavities for bandpass application, if
you
> > replaced the single BpBr coupling loop with two Bp loops on each cavity.
> Try
> > the WP-643 in stock form first.
> >
> > 73, Eric Lemmon WB6FLY
> >
> > Brent wrote:
> >
> > > With yours and Kevin's reply, I have decided to go with a set of
> WP-643s
> > > and not use the WP-639s. I believe this would get me going, and if I
> need
> > > the pre-amp, then I will add it along with the pass cavities.
> > >
> > > One more quick question: Since I have the set of 639s here, what
would
> the
> > > effect of two cans from the 639s be if added to the 643's receiver
side-
> > > besides the loss?
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> > ---
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> >
>
>
>
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>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
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