[Icom] 1. RE: PRO II relay (hot-switching) (Ed Parish K1EP)

[Doug Faunt N6TQS +1-510-655-8604]

   From: "Mel Martin (VE2DC)" <ve2dc@rac.ca>
   Date: Fri, 9 May 2003 06:57:34 -0400

   Just can't resist adding a comment... And I've made this one before...

   I don't agree with blanket statements that one should *always* use an
   external relay!

   There is a down side... This introduces additional switching delay...
   Which is in itself a problem with QSK an perhaps some digital modes...
   I.e. Amtor... (Is anyone still using it?)...
   And with some rigs can also lead to hot-switching of the amplifier
   change-over relay...

   If your amp can safely be switched directly, that's the best way to go.


   Mel...
   VE2DC

OK, I disagree here.  I've replaced the relay in my 756PRO now, and
it's not difficult, but not a plug-in either.  What I'm going to do is
build an external amp cable for the ACC1/2 ports using a plug-in
optoisolator, so that I don't have the switching delay of the daisy
chain, but have something fast and replaceable.  I will also be able
to use this cable with my IC706, using the OPC-599 or equivalent.

I have no evidence that the ratings on the relay were ever exceeded,
but it's not impossible, since this radio has been on 4 major
DXpeditions, one without me.

73, doug