Doug:
Looking at the schematic of the A0 board where the switching and QSK
blocking is done, I can't see that there is any special protection. All
inputs have a gas tube and parallel RF choke to discharge static, but the
main two antenna connections have a diode network that builds voltage to
back-bias a pair of diodes in the RX line to protect the RX front end when
TX RF is present. I suspect that a very strong external signal from another
transceiver in the shack would be blocked by the biased diodes on the two
main inputs from wrecking the O II receiver, but when the input is switched
to the AUX (RX only) input there is little else to stop extremely strong
signals that could damage the front end.
If I was going to use a long wire RX antenna in the area of a QRO transmit
antenna, I would use the ICE limiter/protector model 197 at the RX input, or
home-brew something similar.
Ron N6IE
www.N6IE.com
----- Original Message -----
From: "Speer, Doug" <Doug.Speer@FairbanksMorse.com>
To: <tentec@contesting.com>
Sent: Monday, January 11, 2010 11:06 AM
Subject: [TenTec] Orion II receive antenna input
>I am away from my QTH & Orion II manual. Maybe some of you know the
>answers to my questions. I would like to use the receive antenna input for
>a 160/80m low noise receive antenna input. How much built in RF protection
>/ switching does the Orion II have on this input? In other words how much
>input protection do I need on the receive only antenna to prevent RF damage
>to the Orion due to RF energy from my transmitting antenna feeding back
>into the receiver via the receive antenna input? How is the use of a
>separate receive antenna best handled with a single Orion II station?
>
>
> Doug, W9PN
> Janesville, WI
>
>
>
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