[Icom] Extra relay box to key amp

alexander eban [email protected]
Wed, 27 Mar 2002 11:16:44 +0200 

  Guys, good day to you all:
I've been working with reed relays for a few years. Meder, Good Sky and =
a
few others. They usually have coils  from 5 to 12 VDC operating and the =
most
can handle from 250 to 500 mA minimum. Don't forget: the reed contacts =
are
basically a vacuum relay!!! They handle a surprising amount of power, =
and
the voltages range in the many tens of volts bracket! In my opinion =
Icom
would be hard put to get relays able to carry & mA only. It would have =
to be
a special, VERY special one.
	My educated guess is that you can take the quoted 200mA value as
credible and not worry about voltages. Under these conditions we never =
had a
single failure in 4 years and we made 20000 motion detectors a month at =
that
time, each including a signaling relay of this kind.
Alex Eban  4Z5KS
RF Chief Engineer
Wireless Division
M.T.I. Computers
Tel: +972 3 9025555ext321
Fax: +972 3 9025051
Email: [email protected] <[email protected]>=20

	-----Original Message-----
	From:	Larry Benko [SMTP:[email protected]]
	Sent:	=E3 27 =EE=F8=F5 2002 4:35
	To:	[email protected]
	Subject:	[Icom] Extra relay box to key amp

	I am not addressing this to anyone in particular.  However
	for those who insist on using an additional relay/keying
	circuit because they consider themselves to be cautious,
	be careful that the inline interface does not have too
	much delay.  I have measured 5 different Icom rigs
	including the 746, 756, 756pro, 765, and the 706 and
	all the rigs closed the send relay 9 to 10 milliseconds
	before the beginning of the RF output.  If your interface
	adds too much delay you will be hot switching the RF and
	causing splatter to others on the band.  By the way most
	medium sized relays have operate times in the 8 to 10
	millisecond range.  Be cautious if you wish but please don't
	be inconsiderate and interfere with others.=20

	73,
	Larry Benko, W0QE
	----
	Your Moderator: Dick Flanagan W6OLD, [email protected]
	Icom FAQ: http://www.qsl.net/icom/