[ICOM] Receive antenna input?

[Paul Playford]

I would also be concerned about distorting the transmitted signal when there 
was not enough rf present to activate RL101, but still enough rf feeding 
back into the low level transmit circuitry.

The distortion I am referring to was observed on an unmodified PROII with an 
external receiving antenna, using a waveform monitor (oscilloscope) on the 
transmitter output and appeared as 'grass' riding on the cw rf waveform.

FWIW, this rf feedback may cause IC-151 to fail.

de Paul, W8AEF



----- Original Message ----- 
From: "Jerry Keller" <k3bz at arrl.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Sunday, October 01, 2006 11:10 AM
Subject: [-] Re: [ICOM] Receive antenna input?


> Yes, that's what I was thinking too. Thanks, Adam.
> 73, Jerry K3BZ
>
> ----- Original Message ----- 
> From: "Adam Farson" <farson at shaw.ca>
> To: "'ICOM Reflector'" <icom at mailman.qth.net>
> Sent: Sunday, October 01, 2006 1:45 PM
> Subject: RE: [ICOM] Receive antenna input?
>
>
>> Hi Jerry,
>>
>> In the Pro3, RL101 has a finite operate time. A situation could arise 
>> where
>> sufficient energy from the transmitter would hit the RX-ANT input before
>> RL101 had time to switch over, and cause some damage. I would still
>> recommend the Front-End Saver (or equivalent) even with the Pro3; it is
>> "cheap insurance."
>>
>> Cheers for now, 73,
>> Adam VA7OJ/AB4OJ
>>