[ICOM] Using IC-720a with PACTOR

Tue Mar 14 08:01:46 EST 2006

Hi All,

FWIW, I never had a 720, but have used a 730, 740,
745, and 751A in AMTOR and PACTOR-I modes with both
the KAM Plus as well as an AEA-PK-232MBX, and had no
problems. I don't think there is any significant
difference in the 720 PA Unit and it's T/R switching,
as compared to the other older ICOM rigs that I had
good luck with.

73, Frank W3UHF

--- Mike Brown <k9mi_michael at excite.com> wrote:

> 
> Another thing to consider with the 720A is the
> mechanical t/r relay. I had one I tried to use with
> hf packet in about 1990. Signals were good, but I
> could only get it to work if the guy on the other
> end  would increase his txd (transmit delay). The
> problem with the 720A was that it was not getting
> back in receive quick enough with the mechanical
> relay. If the guy on the other end raised his txd,
> that would give you more time to get back in receive
> mode, and would work. Problem was, most tncs that
> were used (Kam, Kam Plus, AEA 232 MBX, PK 900) all
> had the txd from the factory set at either 30 or 40
> msec. And guys would not change that parameter.
> Usually, if they would change to just 70 or 75 msec,
> things would work. I bought a new low end Yaesu 840
> and never never had anymore trouble after that.
> Hopefully your 720A and pactor work ok. I don't
> remember if pactor was out yet, or maybe I just
> didn't ever try it with the 720A. Best of luck.
> 
> 73, Mike K9MI 
> 
> 
> 
> 
> 
> --- On Mon 03/13, PA3DUV < pa3duv at planet.nl > wrote:
> 
> From: PA3DUV [mailto: pa3duv at planet.nl]
> To: icom at mailman.qth.net
> Date: Mon, 13 Mar 2006 07:29:43 +0100
> Subject: Re: [ICOM] Using IC-720a with PACTOR
> 
> MARS will change to Winlink2000.
> What you need is a SCS PTCII pactor controller.
> I'd recommend the PTCIIPro with Pactor 3 license.
> 
> Cheers, Dick
> PA3DUV
> 
> PS: my 756ProII cannot operate pactor 1, 2 or 3 with
> an external keyboard 
> only. PActors is not the same as RTTY.
> www.scs-ptc.com
> 
> 
> ----- Original Message ----- 
> From: "Cam and Juli Hedrick" 
> To: "'ICOM Reflector'" 
> Sent: Monday, March 13, 2006 3:40 AM
> Subject: RE: [ICOM] Using IC-720a with PACTOR
> 
> 
> > HI Frank, First of all thanks for responding, I
> don't have a TNC yet, what
> > would you recommend? The 756 and 7800 don't
> require anything but a 
> > keyboard
> > and display to use with PACTOR. I'm active in MARS
> and this is one of the
> > requirements for my station. I've had the 720a for
> years, but never even
> > used it for RTTY, just CW and SSB.
> > Thanks,
> > Cam
> >
> > -----Original Message-----
> > From: icom-bounces at mailman.qth.net
> [mailto:icom-bounces at mailman.qth.net] 
> > On
> > Behalf Of Frank A. Ellis
> > Sent: Sunday, March 12, 2006 9:25 PM
> > To: ICOM Reflector
> > Subject: Re: [ICOM] Using IC-720a with PACTOR
> >
> > Hi Cam,
> >
> > The "interface" is simply the TNC AFSK out and TNC
> PTT
> > connecting to the mic jack of the rig, and the
> audio
> > in to the TNC coming from either the ACC jack on
> the
> > rear of the radio (24-pin), or via the phone jack.
> >
> > While I haven't used the 720, I have run PACTOR
> with
> > my 730, 740, 745, and 751A using both the KAMPlus
> and
> > PK-232MBX. The same cable for each type TNC works
> with
> > all the radios listed, and would be the same for
> the
> > 720. There is a little difference in the AFSK
> level
> > needed from the TNC for the older radios (730-740)
> and
> > the newer ones (745-751A) but the AFSK level pot
> in
> > the PK-232 has plenty of range.
> >
> > Not sure of your TNC type, but the hookup
> recommended
> > for a generic 8-pin ICOM should work OK as-is.
> >
> > You can email me offlist, if you want to work out
> > details of the interface.
> >
> > 73 Frank W3UHF
> >
> >
> >
> >
> >
> > --- Cam and Juli Hedrick 
> > wrote:
> >
> >> HI,
> >> Does anyone have any experience with this? I hope
> >> to set mine up for PACTOR
> >> as a back-up to the 7800 and 756proIII. What
> >> interface should I go with?
> >> All advice greatly appreciated...the PRO III has
> >> gone down twice, and the
> >> 7800 had a programming glitch from the factory
> and
> >> is now at Icom. The 720a
> >> has never been in for service since I bought it
> new!
> >> Thanks
> >> Cam
> >> WA4JKW
> >>
> >>
> >> ----
> >> Your Moderator: Dick Flanagan K7VC,
> >> icom-owner at mailman.qth.net
> >> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> >> Icom FAQ: http://www.qsl.net/icom/
> >>
> >
> >
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> >
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC,
> icom-owner at mailman.qth.net
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> 
> ----
> Your Moderator: Dick Flanagan K7VC,
> icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
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> ----
> Your Moderator: Dick Flanagan K7VC,
> icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> 

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