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Author Topic: Pro-III, RX antenna  (Read 415 times)
WW5AA
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Posts: 2086




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« on: August 14, 2007, 08:17:12 AM »

I have been using a homebrew RF sense switch for several years to switch between my TX and RX antennas. When RF is applied the switch grounds my receive antenna and switches the pre-amp to the through position. I have never used the RX antenna connector on the Pro III. The manual does not have a lot of information (or I’m not finding it) on the RX antenna connector. The question is:

1. Does the Pro III ground the RX antenna when transmitting?  

2. How much attenuation can I expect?

Thanks for any help.

73, de Lindy
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AA4PB
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Posts: 12857




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« Reply #1 on: August 14, 2007, 04:51:46 PM »

It doesn't ground it but it is disconnected from the receiver input during transmit. It's designed to function with a separate receive antenna on HF (typically for a beverage or other low noise receive antenna for 160/80M). According to the block diagram it bypasses the normal T/R section + tuner and has its own high pass filter.
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WW5AA
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Posts: 2086




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« Reply #2 on: August 15, 2007, 07:20:55 AM »

Thank you Bob ...just what I needed.

73, de Lindy
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