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Re: Topband: TX/ RX Antenna Switching

To: "Buck wh7dx" <wh7dx@hawaii.rr.com>, <topband@contesting.com>
Subject: Re: Topband: TX/ RX Antenna Switching
From: "Tom W8JI" <w8ji@w8ji.com>
Reply-to: Tom W8JI <w8ji@w8ji.com>
Date: Wed, 14 Nov 2012 07:51:07 -0500
List-post: <topband@contesting.com">mailto:topband@contesting.com>
It sounds like the DX and MFJ are out because of Watt limitations (200W?).


You are misinterpreting the ratings.

The ratings are for power from the transceiver sent out THROUGH the device, not transmitter power to some other system not directly connected to the device.

The switches go between the radio and amplifier. This means unless you have a radio with more than 200 watts driving your amplifier, they are fine in the intended application.

If you use them as a receiver line limiter or disconnect, and do not intend to transmit through them, the power rating does not apply at all because it is an external system. In that case, the power rating would depend on mutual coupling between transmitting and receiving antennas and impedances of the receiving antenna system. A "power" rating would be impossible to define because systems vary so much, but it would be many kilowatts even with close antennas.

73 Tom
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