[Icom] Does the new Icom Pro require

Sun, 17 Feb 2002 20:25:52 -0500

This is different then the send (RCA jack) on the back panel, which is a
relay closure.

----- Original Message -----
From: "Brian Allen" <[email protected]>
To: <[email protected]>
Sent: Sunday, February 17, 2002 7:56 PM
Subject: Re: [Icom] Does the new Icom Pro require

Maybe this note from ACOM will help explain it a little more.  Apparently,
they have had discussions with ICOM in interfacing their amps.

73, Brian (N0VSB)

NOTE FROM ACOM:
Generally, the HSEND (SEND) signal on the ACC connector of ICOM models is
bidirectional. If you connect it to the ground, the transceiver will go to
transmit, i.e. it acts like an external PTT input. A 20mA "output" current
will flow through your external PTT contact. This direction of the HSEND
SEND) however is not used for external amplifiers control. Another function
of the same signal is an output, that goes to the ground when you activate a
transmission using the front panel SEND button, mike PTT, VOX, or CW keyer.
In this direction, it will withstand 100-200mA "input" current (drawn from
amplifier's control input) and is suitable to control ACOM amplifiers.

>From: Larry Benko <[email protected]>
>Reply-To: [email protected]
>To: [email protected]
>Subject: Re: [Icom] Does the new Icom Pro require
>Date: Sun, 17 Feb 2002 17:43:46 -0700
>
>This topic seems to get rehashed over and over.  Ratings for
>relay contacts are very dependent on the load type (e.g.
>resistive or inductive) and how long you wish the relay to
>last.  I have designed equipment for many years that used
>dry reed relays (like the keying relay in Icom gear) and it
>was common to see the low voltage resistive load current
>spec reduced by an order of magnitude when driving inductive
>loads or higher voltages.  Therefore I would hypothesize that
>the Icom relay is really a ~20V 2A contact for resistive loads
>but for inductive loads or higher voltages it needs to be
>reduced perhaps by a factor of 10.  Somewhere along the way
>someone may have drawn the conclusion that the ratings in the
>Icom manuals were "typos" and should be .2A.
>
>73,
>Larry Benko, W0QE
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