Re: [RFI] Utility coming tomorrow to chase RFI

["qrv@kd4e.com" <qrv@kd4e.com>]

Tom,

        Oh wait!

        It only does AM-rx 108-137?

        "1.5 µV TYP for 10 dB SN (108-137 MHz, AM)"

        Can the VX-3R be modded to open up AM-rx through
UHF?

        Or is AM only on HF (OK re. 3uV HF) and 108-137
sufficient for most purposes?

        If not I may go back to hunting an affordable TH-F6A.

Thanks - David KD4E

> Don,
>
> Here is the sensitivity chart for the VX-3R:
>
>
> *Sensitivity*:3 µV for 10 dB SN (0.5-1.8 MHz, AM Radio)
>
> 3 µV for 10 dB SN (0.5-30 MHz, AM)
>
> 0.35 µV TYP for 12 dB SINAD (30-54 MHz, NFM)
>
> 1 µV TYP for 12 dB SINAD (54-76 MHz, NFM)
>
> 1.5 µV TYP for 12 dB SINAD (76-108 MHz, FM Radio)
>
> 1.5 µV TYP for 10 dB SN (108-137 MHz, AM)
>
> 0.2 µV for 12 dB SINAD (137-140 MHz, NFM)
>
> 0.16 µV for 12 dB SINAD (140-150 MHz, NFM)
>
> 0.2 µV for 12 dB SINAD (150-174 MHz, NFM)
>
> 1 µV TYP for 12 dB SINAD (174-225 MHz, NFM)
>
> 0.5 µV for 12 dB SINAD (300-350 MHz, NFM)
>
> 0.2 µV for 12 dB SINAD (350-400 MHz, NFM)
>
> 0.18 µV for 12 dB SINAD (400-470 MHz, NFM)
>
> 1.5 µV for 12 dB SINAD (470-540 MHz, WFM)
>
> 3 µV TYP for 12 dB SINAD (540-800 MHz, WFM)
>
> 1.5 µV TYP for 12 dB SINAD (800-999 MHz, NFM)
>
> Tom
>
>
> On 6/7/2014 2:07 PM, qrv@kd4e.com wrote:
> > Tom,
> >
> >     How is the AM sensitivity Low-VHF and up?
> >
> >     Any AGC or other insummountable fixed settings that
> > might make it a poor choice for RFI-hunting?
> >
> > Thanks - David KD4E
> >
> > > Don,
> > >
> > > The VX-3R has an HF sensitivity of 3 uV on AM which is equivalent to an
> > > S-5 signal.  Couple that with the reduced antenna factor of a portable
> > > antenna, you might not be able to hear anything but very strong RFI.
> > >
> > > Tom   W0IVJ
> > > On 6/7/2014 1:16 PM, ac2ev wrote:
> > > > Does anybody have settings that work for the Yaesu VX-3R. It's all
> > > > mode receive and can use either the built in bar antenna or external
> > > > in AM but so far I can't get it to hear the RFI in the noise.
> > > >
> > > > 73
> > > > AC2EV - Don


--

David Colburn, KD4E - Nevils, Georgia USA

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