Pin 3 which is HSEND is bi-directional. As the manual shows below.
When you ground HSEND the radio transmits. HSEND goes to ground when you put
the radio into transmit from the microphone, or via a software command.
73
Jim W7RY
Pin 3 HSEND
Input/output pin.
Grounded when transmits.
Ground level
Output current
Input current (Tx)
: –0.5 V to 0.8 V
: Less than 20 mA
: Less than 200 mA
-----Original Message-----
From: Hector Garcia,XE2K
Sent: Friday, October 09, 2015 2:08 PM
To: Bill Turner ; RTTY Reflector
Subject: Re: [RTTY] IC-7100 FSK connection question
Bill I got it, just because I'm using the Hsend (pin 3) like they recommend to
Key the amp, was my doubt if the Hsend in/out function can be possible
conflict, but now that I receive the orientation where and what to do will
work in that path using only the 13 pins (ACC Socket), I will do not buy the
OPC-599 adapter $60 if is not needed to have just ACC 1 and ACC 2worst case
scenario will use the radio rear mic jack to get a PTT line when build a new
External Keypad to send the internal 4 memories
Thanks for the help, I need to order some little parts No more R S locally and
dig the drawer for some other parts, build it and leave it in Mexicali to have
that radio ready to use.
J.Hector Garcia XE2K / AD6D
Mexicali B.C DM22fp / El Centro
P.O.Box 73
El Centro CA 92244-0073
USA
http://xe2k.net
Tweeter @XE2K
On Friday, October 9, 2015 1:21 PM, Bill Turner <dezrat@outlook.com> wrote:
------------ ORIGINAL MESSAGE ------------(may be snipped)
On Fri, 9 Oct 2015 17:48:51 +0000 (UTC), you wrote:
>
>Jim, Billthank you for answer, I change from the
>IC-7000 to the IC-7100 I was using the 7000 with
>FSK, I build the interface, no problem, this one
>use the stereo 1/8 connector for the FSK the tip
>FSKK, Send and ground ( PTT) nowin the IC-7100
>I have only the FSKK with the pin 10 Black wire,
> and there is not a PTT(marked) but I want to
>know if I can use the the VSEND as PTT because
>the Hsend is now the one thatkey the amp.
>
> J.Hector Garcia XE2K / AD6D
REPLY:
No, do not use the "SEND" jack for PTT. That is for keying an external
amplifier. Unfortunately, ICOM uses the word "SEND" in two different
places for two entirely different functions. The other place is on the
ACC-1 connector where "SEND" means PTT. ICOM should change this usage
to avoid confusion. Better terminology would be "AMP KEY" and "PTT".
The 1/8 inch connector labeled "REMOTE" is only for read and write to
the VFO. For PTT and FSK you have to use the ACC-1 connector.
On the ACC-1 connector, using the plug that came with the radio, the
red wire is ground, the orange wire is PTT and the black wire is FSKK.
Note that the red wire is a common ground for both PTT and FSKK.
Also note that the manual calls the FSK keying line FSKK (with the
extra "K"). It means the same thing.
Hope this helps.
73, Bill W6WRT
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