[OKDXA] 740

Tue Feb 23 21:07:34 EST 2010

I still have my '930S, though I haven't used it much. I did all the 
mods for the power supply and have the International Radio (Inrad) 
filters in it along with the PIEXX board, which allows computer 
control of all but mode. It runs 28 VDC as Vcc in the final PA, and 
so has exceptional tx IMD performance (even by current standards). It 
has a linear PS and so is pretty heavy.

The '930S has a fair bit of phase noise in the synthesizer judged by 
our current standards and if there's one transmitting close by you'll 
certainly hear it. Probably because the low bands are noisy anyway, 
the phase noise isn't as apparent. Because of the phase noise, the rx 
folds rather easily with strong signals that are within 10-20 kHz, 
such as in a FD or multi-multi environment. It's not as bad as the 
Yeasu FT-747GX (terrible phase noise!), though and still quieter than 
the TS-940S. Mine is aligned to within an inch of its life, 
absolutely centered in the filters and I've been complemented on its 
performance.

It has a triple conversion rx with a VHF 1st IF (44 MHz) and, until 
recently, we were stuck with the original ceramic roofing filter 
which is (I think) 40 kHz wide with rather shallow skirts. Within the 
past few years, Inrad has developed a much better roofing filter for 
it that is only 4 kHz wide. With it installed strong signals further 
than 2 kHz away simply vanish. Aside from having negative 
consequences if you like AM, it's a well-spent $175 and revitalizes 
an already good radio.

That said, the '930 is getting very long in the tooth. If anything 
significant fails on this one, I'll probably not try to fix it unless 
I can get a cheap parts rig.

73,

Kim Elmore N5OP

At 07:39 PM 2/21/2010, you wrote:
>The QST review of the 980 criticized it for having a noisy 
>synthesizer, but most DXers who are familiar with it say it is one 
>of the best low bands rigs ever. Interesting how the 2 conflict.
>
>73s John AA5JG
>
>--- On Sun, 2/21/10, W5JMW <w5jmw at cableone.net> wrote:
>
> > From: W5JMW <w5jmw at cableone.net>
> > Subject: Re: [OKDXA] 740
> > To: "Discussion of OKDXA" <okdxa at mailman.qth.net>
> > Date: Sunday, February 21, 2010, 7:14 PM
> > RR completely forgot about the
> > ft-1.The 980 may have had a keyer
> > option..tooo long ago..hi hi  73 john
> > ----- Original Message -----
> > From: "John Geiger" <aa5jg at yahoo.com>
> > To: "Discussion of OKDXA" <okdxa at mailman.qth.net>
> > Sent: Sunday, February 21, 2010 7:09 PM
> > Subject: Re: [OKDXA] 740
> >
> >
> > I think that is right about the Signal one.  The FT1
> > also had a built in
> > keyer, but I think the 740 came out before it. I forgot
> > about the 901/902
> > having a keyer.  For some reason they were never as
> > popular as the TS830.
> > Never sure why as they had more features-like the keyer,
> > FM, memories, width
> > control for all modes.
> >
> > 73s John AA5JG
> >
> > --- On Sun, 2/21/10, Robert Redmon <k5sm.bob at gmail.com>
> > wrote:
> >
> > > From: Robert Redmon <k5sm.bob at gmail.com>
> > > Subject: Re: [OKDXA] 740
> > > To: "Discussion of OKDXA" <okdxa at mailman.qth.net>
> > > Date: Sunday, February 21, 2010, 6:32 PM
> > > I'm sure you are right, John. At the
> > > time, the CX7 was so far above my
> > > pay grade, I never really gave them much thought.
> > >
> > > Bob k5sm
> > >
> > > W5JMW wrote:
> > > > Robert,John et all,just had to give my 2c worth.I
> > ran
> > > 745's for what
> > > > seemed like forever.I still respect them as well
> > as
> > > the 740.Rigs like
> > > > these were so far ahead of thier time.What we
> > have
> > > today seems to be
> > > > the same features with some newer bells and
> > > whistles.BUT,I think the
> > > > first rig to have a built in keyer was a signal
> > one
> > > cx7..hi hi..73 john
> > > >
> > > >
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