[ICOM] Using IC-720a with PACTOR

[Mike Brown]

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
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>
>
> ----
> 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/ 

----
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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