Fw: [TenTec] Rx-331 Front End - N4PY
Carl Moreschi
n4py@earthlink.net
Sun, 6 May 2001 22:09:03 +0100
----- Original Message -----
From: "Carl Moreschi" <n4py@earthlink.net>
To: "Steve Baron - KB3MM" <SteveBaron@starlinx.com>
Sent: Sunday, May 06, 2001 10:08 PM
Subject: Re: [TenTec] Rx-331 Front End - N4PY
Believe it or not, the DSP processor in the RX-331/340 is 16 bit.
Carl Moreschi N4PY
Franklinton, North Carolina
n4py@earthlink.net
> ----- Original Message -----
> From: "Steve Baron - KB3MM" <SteveBaron@starlinx.com>
> To: "Paul Christensen" <paulc@mediaone.net>; "Mike Hyder -N4NT-"
> <N4NT@chartertn.net>; "Carl Moreschi" <n4py@earthlink.net>; "tentec"
> <tentec@contesting.com>
> Sent: Sunday, May 06, 2001 7:00 PM
> Subject: Re: [TenTec] Rx-331 Front End - N4PY
>
>
> >
> > Do you know which (#bits. real or float) DSP the 340 uses ?
> >
> > ----- Original Message -----
> > From: "Paul Christensen" <paulc@mediaone.net>
> > To: "Mike Hyder -N4NT-" <N4NT@chartertn.net>; "Carl Moreschi"
> > <n4py@earthlink.net>; "tentec" <tentec@contesting.com>
> > Sent: May 06, 2001 17:16
> > Subject: Re: [TenTec] Rx-331 Front End - N4PY
> >
> >
> > >
> > > Absolutely. In fact, the one and only weak link in my RX-340/Pegasus
> > > combination is the relatively high phase noise of the Pegasus
> synthesizer.
> > > Not so with the RX-340. In fact, I can null a received CW tone with
> known
> > > low phase noise on the RX-340 to a greater degree than I can with my
> Omni
> > > Six which uses crystal mixing. The synthesizer in the RX-340 is that
> > good.
> > > Another absolutely stunning performance feature of the RX-331/340 is
the
> > > I.F. DSP shape factor. I am now using a Fast Fourier Transform
program
> > from
> > > Sound Technology Corporation called Spectra-Plus. This is incredible
> > > software if you're an audiophile and works very well in characterizing
> > your
> > > own transmitted SSB bandwidth for those who are now venturing into the
> > Hi-Fi
> > > SSB scene. If you have a sound card in your PC, here's the link to a
> free
> > > 30-day trial:
> > >
> > > http://www.telebyte.com/pioneer/
> > >
> > > By clicking on the peak-hold button you can almost instantly
> characterize
> > > any receive or transmitted passband characteristic. With Spectra
Plus,
> > it's
> > > very easy to see the RX-340's tight filter skirts.
> > >
> > > Of course, the heart and soul of the RX-340/Pegasus world-class
> > combination
> > > is the N4PY software. Those of you who think that excellent QSK
cannot
> be
> > > achieved with "separates," QSK is every bit as good as any other
Ten-Tec
> > > with Carl's sequencing protocol. At some point, I'm hoping that Carl
> > > bullet-points the entire feature set of his software as it has evolved
> > over
> > > the past year and a half.
> > >
> > > As Carl noted, the front end on the RX-331/340 receivers is
outstanding.
> > A
> > > few weeks ago, I computed that you needed something like a 2 watt
signal
> > > driven directly into the receiver's antenna jack to overload and
> compress
> > > the front end! (preamp off).
> > >
> > > I think it would be great if Ten-Tec and Carl could demo of this
> > combination
> > > at Dayton. I guarantee it would steal the show and be the talk even
> among
> > > the die-hard FT-1000MP and ICOM-765PRO users.
> > >
> > > -Paul, W9AC
> > >
> > > ----- Original Message -----
> > > From: "Mike Hyder -N4NT-" <N4NT@chartertn.net>
> > > To: "Carl Moreschi" <n4py@earthlink.net>; "tentec"
> <tentec@contesting.com>
> > > Sent: Sunday, May 06, 2001 12:28 PM
> > > Subject: Re: [TenTec] Rx-331 Front End - N4PY
> > >
> > >
> > > >
> > > > That is impressive -- a notable tribute to the clean signal
> transmitted
> > by
> > > a
> > > > Delta 580, as well as the Rx-331 receiver. Do you think that a
> > > synthesized
> > > > radio's transmitter would be as clean?
> > > >
> > > > 73 de Mike N4NT@chartertn.net
> > > >
> > > > ----- Original Message -----
> > > > From: "Carl Moreschi" <n4py@earthlink.net>
> > > > To: "tentec" <tentec@contesting.com>
> > > > Sent: Sunday, May 06, 2001 10:53 AM
> > > > Subject: [TenTec] Rx-331 Front End - N4PY
> > > >
> > > >
> > > > >
> > > > > I decided this morning to do an experment to see how resistant
> > > > > my RX-331 is to front end overload. I have a dipole on a separate
> > > > > feedline located about 100 feet from my tower. On my tower, I
have
> > > > > a log periodic 8 element antenna. I tuned the RX-331 to 21.250
and
> > > > > was listening to a Russian station running about S7 on the log
> > periodic.
> > > > >
> > > > > I setup my Ten-Tec 580 Delta to the dipole and tuned it to 21.050.
> > > > > I transmitted a carrier. No effect whatsoever was heard on the
> > RX-331.
> > > > > In fact I found the RX-331 was not the least bit disturbed by the
> > > Delta's
> > > > > 100 watts until I got to within 10 kHz of the RX-331 tuned
> frequency.
> > > > >
> > > > > I thought this was very impressive. I have never seen another
front
> > > > > end on a receiver that was this strong. This would certainly
solve
> > > > > what I call the classic "field day problem", when you run many
rigs
> > > > > close together.
> > > > >
> > > > >
> > > > > Carl Moreschi N4PY
> > > > > Franklinton, North Carolina
> > > > > n4py@earthlink.net
> > > >
> > > >
> > > >
> > > > --
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> > >
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> >
> >
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>
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