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Re: Topband: TX/ RX Antenna Switching

To: "Tom W8JI" <w8ji@w8ji.com>, "Buck wh7dx" <wh7dx@hawaii.rr.com>, <topband@contesting.com>
Subject: Re: Topband: TX/ RX Antenna Switching
From: "ZR" <zr@jeremy.mv.com>
Date: Wed, 14 Nov 2012 15:55:27 -0500
List-post: <topband@contesting.com">mailto:topband@contesting.com>
How do we know what it has with no schematic available? It could be $1-2 worth of parts.

I recommend that nobody buy anything from DXE that does not support an at home repair.

Carl
KM1H


----- Original Message ----- From: "Tom W8JI" <w8ji@w8ji.com>
To: "Buck wh7dx" <wh7dx@hawaii.rr.com>; <topband@contesting.com>
Sent: Wednesday, November 14, 2012 8:07 AM
Subject: Re: Topband: TX/ RX Antenna Switching


By the way Buck, there is more to this than some people will tell you.

The DXE switch uses a unique RF limiter that kicks in hard at about 23 dBm. Below that level there is no intermod at all!! It will not deteriorate the receiver, like normal cheap back-to-back diode systems.

If you need a receiver limiter and do not want to hurt receiver dynamic range on modern receivers, it takes far more circuitry than cheap back-to-back diodes.

73 Tom
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