[Icom] Send Relay "real scoop" from ICOM

Tue, 19 Feb 2002 22:22:50 -0600

I used the Harbach soft key mod in my SB-200. Works like a champ with my
756.

73,
Ed KA9EES

----- Original Message -----
From: "Jerry Flanders" <[email protected]>
To: <[email protected]>
Sent: Tuesday, February 19, 2002 10:14 PM
Subject: Re: [Icom] Send Relay "real scoop" from ICOM

I wonder if he made a typo in his email reply ;)

Seriously, if there is any inductive kickback at all in a 12V keying
circuit, you will exceed that 16V greatly. I think ICOM is telling us that
in a 12V inductive circuit, make SURE you have a properly designed circuit
to absorb that back emf. My AL-1200 has a snubbing diode across the relay
that works for me, but if it failed I wouldn't know it before the damage
would likely occur. Might be good insurance to add another diode to backup
the first. I wonder if some of those failures we heard about occurred
because the diode smoked.

To those who say just add another relay - timing goes to pot quickly. Most
mechanical relays are already too slow to avoid some hot-switching with
just the one relay. Another conventional relay doubles the delay, and with
a homebrew isolation relay you need to worry about snubbing it also.

Jerry W4UK

At 08:09 PM 2/19/2002 -0500, you wrote:
>My response from ICOM:
>
>
>The real scoop is UP TO 16V -OR- UP TO 2 amps.  We always recommend the
>use of an isolation relay, such as that manufactured by Ameritron.  Good
>insurance for a rig like this.
>
>Nick Sutton, NS7DX
>Technical Service Representative
>Icom America, Inc.
>---

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