[Icom] How to protect Rx Ant input?

Sun, 02 Jun 2002 22:27:05 -0500

There is enough RF picked up by a longwire or beverage type antenna
connected to the auxillary antenna input to destroy the receivers front end.
This has happened to many guys with all sorts of different radios.  This is
especially possible when running a KW or more on 160 or 80 meters.  The best
protection is to have the antennas disconnected during transmit. 73's de
gary, kd9sv

----- Original Message -----
From: "Larry Benko" <[email protected]>
To: <[email protected]>
Sent: Sunday, June 02, 2002 10:02 PM
Subject: Re: [Icom] How to protect Rx Ant input?

> Gee, looking at the schematic shows a Varistor(R112), a lamp (DS111),
> and back to back diodes to ground (DS101, DS102).  This certainly
> seems like protection of the RX Antenna port.  The diodes are 1SS302
> types and are good for at least 100mA.  This sure seems like protection
> to me.  What component(s) gave up when you had your problem before?
>
> 73,
> Larry, W0QE
>
> Chris BONDE wrote:
> >
> > OO  O O I always thought that it was shut off.  Now, there goes my plans
> > for a Rx antenna and a Tx antenna.
> > Thanks for the warning.
> >
> > Chris opr VE7HCB
> >
> > At 08:14 PM 2002-06-02 +0000, you wrote:
> > >Hi list(s),
> > >i want to add a relay in front of the Rx-Antenna input of my 756Pro,
since
> > >this input is not protected (turned off) during TX, and I already fried
my
> > >RxIn once.
> > >
> > >Question:
> > >What kind of relay should I use? I.e. which is suitable for HF use?
> > >
> > >73,
> > >Ekki, DF4OR
> > >----
> > >Your Moderator: Dick Flanagan W6OLD, [email protected]
> > >Icom FAQ: http://www.qsl.net/icom/
> >
> > ----
> > Your Moderator: Dick Flanagan W6OLD, [email protected]
> > Icom FAQ: http://www.qsl.net/icom/
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom FAQ: http://www.qsl.net/icom/