The lattice vs. ladder may be a point on the JA rigs. The other item may be
the presence of digital artifacts (synthesizer phase noise etc.) which
can "color" the audio.
73, Al
On Mon November 28 2016 12:25:33 pm Steve Ellington wrote:
> We know that crystal filters do affect the shape of an RF envelope.
> Question: Don't the JA rigs use lattice instead of latter crystal filters?
> Anybody know? I always assumed that was part of the difference.
>
> On Mon, Nov 28, 2016 at 10:22 AM, Barry N1EU <barry.n1eu@gmail.com> wrote:
> > I agree on the sweet cw sound but I don't know if it's attributable to
> > the filters - just a guess, but I'd be more inclined to look at the prod
> > detector or post prod detector (AF) rather than upstream of the prod
> > detector (RF/IF).
> >
> > 73, Barry N1EU
> >
> > On Mon, Nov 28, 2016 at 10:00 AM, Steve Ellington <steven4lq@gmail.com>
> >
> > wrote:
> > > I have heard it said that the crystal ladder filters used in TenTec
> > > rigs
> >
> > is
> >
> > > what gives them their unique sound for cw that pleases so many of us.
> > > Something sure does!
> > > Steve N4LQ
> > >
> > > On Mon, Nov 28, 2016 at 7:53 AM, Paul Christensen <w9ac@arrl.net> wrote:
> > > > Ladder and Cohn IF filters are easily made with 6-8 common HC-6 or
> >
> > HC-49S
> >
> > > > crystals. In production quantiles, these should be no more expensive
> > >
> > > than
> > >
> > > > the original Ten Tec IF filters modules.
> > > >
> > > > https://www.arrl.org/files/file/QEX_Next_Issue/Nov-Dec_
> > > > 2009/QEX_Nov-Dec_09_F
> > > > eature.pdf
> > > >
> > > > Paul, W9AC
> > > >
> > > > -----Original Message-----
> > > > From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
> > > > Bwana
> > >
> > > Bob
> > >
> > > > Sent: Sunday, November 27, 2016 10:32 PM
> > > > To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
> > > > Subject: Re: [TenTec] On the Corsair II revival idea and receiver
> > > > noise
> > > >
> > > > There is another problem with crystal and mechanical filters:
> > > > Availability. Collins recently discontinued their filter line. With
> >
> > the
> >
> > > > DSP
> > > > revolution ongoing, analog filters will become even more expensive.
> > > > One of the filters in my Paragon went bad with high insertion loss,
> >
> > and I
> >
> > > > bought a replacement from INRAD.
> > > >
> > > > 73,
> > > >
> > > > Bib WB2VUF
> > > >
> > > > On 11/24/2016 6:25 AM, rick@dj0ip.de wrote:
> > > > > Even if it equaled the K3 performance, it would be outstanding.
> > > > > But the problem is and remains Xtal Filters.
> > > > > We'll need 6, maybe 8 of them and we'll be lucky if they are priced
> > > > > under
> > > > > $100 each.
> > > > >
> > > > > 73 - Rick, DJ0IP
> > > > > (Nr. Frankfurt, Germany)
> > > > >
> > > > >
> > > > >
> > > > > -----Original Message-----
> > > > > From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of
> >
> > Barry
> >
> > > > > N1EU
> > > > > Sent: Thursday, November 24, 2016 11:31 AM
> > > > > To: Discussion of Ten-Tec Equipment
> > > > > Subject: Re: [TenTec] On the Corsair II revival idea and receiver
> > > > > noise
> > > > >
> > > > > If the Corsair III ended up equaling or exceeding the K3S in
> > > > > performance with the body of an Omni VI+, I'd buy one.
> > > > >
> > > > > 73 & Happy Turkey Day,
> > > > > Barry N1EU
> > > > >
> > > > > On Thu, Nov 24, 2016 at 4:13 AM, GARY HUBER <GLHuber@msn.com> wrote:
> > > > >> Before I bought my Corsair-II and was looking at the Paragon and
> > > > >> Corsair-II, I was asked by one of the TenTec staff manning their
> > > > >> booth at Dayton, "What radio are you using now and what is your
> > > > >> principal use, DXing, nets, rag chewing or something else?" When I
> > > > >> responded that I was using a model 546-C and matching external VFO
> >
> > to
> >
> > > > >> chase DX from a quiet rural location, his response was, "you'll be
> > > > >> a lot happier with a Corsair-II... you'll be able to hear weak
> >
> > stations
> >
> > > > >> with it that will be covered in noise in the Paragon!" I bought
> > > > >> the Corsair-II and sold my OMNI-D to my best friend who had just
> > > > >> become
> >
> > a
> >
> > > > >> General licensee and was looking for a radio.
> > > > >>
> > > > >> I still have that Corsair-II which was built in the last
> > > > >> production run of model 561s. I did A-B tests with it and the
> > > > >> Paragon (model 585) I bought several years later for MARS work for
> > > > >> Operation Desert Shield and Operation Storm. In those tests which
> > > > >> were done using a DOW Key Relay reversed so that only one radio
> > > > >> was connected to an antenna or with a coaxial jumper between the
> > > > >> two radios with one switch set for AUX ANT and the other to AUX RX
> > > > >> and with the radio with the switch set to AUX RX having a good
> > > > >> antenna connected to its SO-239, the Corsair-II was always
> > > > >> slightly better. Its those signals below S-2 and into the RX/band
> > > > >> noise where the Corsair-II comes out
> > > >
> > > > ahead.
> > > >
> > > > >> I also had a fully loaded OMNI-VI+ (model 564) and found it,
> > > > >> through testing in the manner above, to be at least equal to the
> > > > >> Corsair-II, mostly due to 1.8 kHz and 500 Hz filters in BOTH
> > > > >> I.F.s, making it more selective and a bit quieter. The CAT serial
> > > > >> port on the 564 is
> >
> > a
> >
> > > > >> huge advantage for those doing computer logging while DXing or
> > > >
> > > > Contesting.
> > > >
> > > > >> The lack of frequency / mode information from an un-modified
> > > > >> Corsair-II like the one I own is its major drawback, in my
> > > > >> opinion.
> > > > >>
> > > > >> I currently have an OMNI-VII (model 588) with a FLEX-1500 as its
> > > > >> sub-RX (N4PY mod) as my primary radio and with the Corsair-II as
> > > > >> the back radio. (see AB9M at QRZ.com for the station photo) While
> > > > >> the OMNI-VII is a great radio for my needs, in my opinion (and
> > > > >> experience) it needs to some careful adjustment of the RF gain to
> > > > >> avoid digital artifacts which are created from strong signals in
> > > > >> the passband when trying to work 2 kHz to 10 kHz from the DX
> > > > >> station
> >
> > with
> >
> > > > lots of callers.
> > > >
> > > > >> Regarding the cost of any Corsair-II replacement; I know there is
> >
> > the
> >
> > > > >> issue of price, but I believe its also a matter of value for an
> > > > >> experience which cannot be matched by others. If you provide a
> > > > >> pure analog receiver and transmitter chain like the model 561 with
> > > > >> only DDS VFO and CAT serial ports then perhaps your market segment
> > > > >> is in
> >
> > a
> >
> > > > >> different range than the IC-7300. Today absent any product from
> > > > >> TenTec to replace my OMNI-VII and FLEX-1500, I'll keep my
> > > > >> Corsair-II and buy a FLEX-3000. The Eagle may need a replacement,
> > > > >> but one for the OMNI-VII and ORION is long overdue.
> > > > >>
> > > > >> --
> > > > >> 73 ES DX,
> > > > >> Gary - AB9M
> > > > >>
> > > > >> _______________________________________________
> > > > >> TenTec mailing list
> > > > >> TenTec@contesting.com
> > > > >> http://lists.contesting.com/mailman/listinfo/tentec
> > > > >
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