[Icom] Fw: T/R relay damage

Mon, 27 May 2002 18:36:16 -0700

Gary,

The reed-type keying relay used in Icom HF transceivers is Type OMR-109F,
manufactured by Tyco Electronics/OEG. Information on this relay, including a
data sheet, is available here:

http://www.qsl.net/icom/auxrelay.html

The current rating is ambiguous, as it seems to refer to current-0carrying
capacity rather than switching capacity. As I have already reiterated ad
nauseam, a buffer interface is cheap insurance.

Best 73,
Adam, VA7OJ/AB4OJ
North Vancouver, BC, Canada
http://www.qsl.net/ab4oj/
Note new e-mail address:
mailto:[email protected]

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of gary nichols
Sent: Monday, May 27, 2002 12:12
To: [email protected]
Subject: [Icom] Fw: T/R relay damage

----- Original Message -----
From: "gary nichols" <[email protected]>
To: <[email protected]>
Sent: Monday, May 27, 2002 9:24 AM
Subject: T/R relay damage

> To whom it may concern at ICOM,
>      My name is Gary Nichols, kd9sv and I designed a Receiver protection
> device (CQ magazine, Feb 97) and recently have added a larger relay in the
> amplifier keying line to protect the "fragile" T/R relays of ANY
transceiver
> it is used with.  In addition it protects the receiver front end from
damage
> by RF from the transceivers own transmit signal coming in thru the
> "unprotected" aux ant input during transmit.  I am attaching an
information
> sheet with this E-mail.  By the way, are you at liberty to share with me
> what relays the various ICOM radios use for T/R purposes?
>
> Sincerly, Gary Nichols, kd9sv
>
> PS: My good friend Chuck, of C&S Eng. (now deceased) used to build these
>