[R-390] R-390A On 160 Meters

[wb5uom at hughes.net]

Agreed. I just got tired of hooking and rehooking coaxes, and using two
different antennas wasnt a real good test either, so I gave in to the DA4


----- Original Message ----- 
From: "2002tii" <bmw2002tii at nerdshack.com>
To: <r-390 at mailman.qth.net>
Sent: Monday, February 23, 2009 10:16 PM
Subject: Re: [R-390] R-390A On 160 Meters


> David wrote:
>
> >All Receivers are fed thru a DA-4 Multicoupler.
>
> Bill wrote:
>
> >>At the time, all three were sharing the same antenna
> >>via a Stridsberg MCA104 receiver multicoupler.
>
> Don't discount the effect the multicouplers may be having on the
> results.  The output-to-output isolation is only on the order of 20
> dB for these units, and the noise figures aren't great (claimed 8 dB
> for the DA-4, claimed 2.5 dB for the MCA104, although the ones I've
> measured have been significantly worse -- around 10-12 dB for
> each).  If one of the receivers is putting junk out its input (common
> with some of the digital receivers), all bets are off.  Distortion in
> the multicoupler amp can spread the junk all over the bands, so even
> out-of-band spurious emissions can hurt the performance of other
receivers.
>
> I'm not saying I think this explains any of the reported results,
> just that it can't be ruled out.
>
> Best regards,
>
> Don
>
>
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