To: | Steve Katz <stevek@jmr.com>,"'Japerlick@aol.com'" <Japerlick@aol.com>, W7MJM@arrl.net,amps@contesting.com |
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Subject: | RE: [BULK] - [Amps] IC-718 and AL-811: Icom manual misleading,interface nec... |
From: | "Martin J. Morgenbesser" <w7mjm@arrl.net> |
Date: | Fri, 04 Feb 2005 13:49:29 -0800 |
List-post: | <mailto:amps@contesting.com> |
Thanks for your responses, guys. The SOA explanation makes sense to me, if it were a solid state device doing the switching. But as Steve points out, the IC-718's "send relay" is in fact a physical relay, as depicted in the schematic. And if it is rated for 16V @ 2A, as the manual suggests, it should be able to directly handle the 12V @ 100ma present on the AL-811's relay line. However, given the Icom representative's stated reluctance to consider it Icom's fault if the IC-718 send relay were to fail under those operating conditions, I decided to spring for the ARB-704. Ironically, the ARB-704 is a solid state device, but one capable of handling the Al-811's relay line! The bottom line: Icom needs to do a better job of stating the technical specs in their manual, or give the customer the benefit of the doubt. Of course, now I won't have to test their willingness to do the latter. In any case, I'm very happy with the IC-718/ARB-704/AL-811 combination. The amp keys beautifully and puts out a solid signal. Plus, thanks to the ARB-704, I have an additional red LED letting me know I'm keying the amp. :-) One other thing, if Tom Rauch is reading this: Thank you for designing such a nice amplifier that can be had at a very reasonable price! See you all on the air! At 11:36 AM 2/4/05 -0800, Steve Katz wrote: SOA is surely something to consider, except the IC-718 uses a keying relay for the amplifier "SEND" function. Check the schematic. They rate it "16V, 2A," without any consideration for simultaneous or not; however, that still begs the question, "Why only a 16V rating for relay contacts?" It's an amazingly low rating, even for tiny TTL relays....-WB2WIK/6 _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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