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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