Pure signal fixed attenuator

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W9BHI
Posts: 127
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Location: Serena Il.

Pure signal fixed attenuator

Postby W9BHI » Sun Jun 07, 2020 6:10 pm

I am using the xtronic coupler and a 20 db fixed attenuator on my 200D .24 radio.
If I should upgrade to a 7000DLE, would the fixed attenuator the same?
Thanks,
Don W9BHI
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w-u-2-o
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Joined: Fri Mar 10, 2017 1:47 pm

Re: Pure signal fixed attenuator

Postby w-u-2-o » Mon Jun 08, 2020 1:24 am

Don,

This topic is what you need to read:

https://apache-labs.com/community/viewtopic.php?f=20&t=2384

However, the TLDR version is, assuming you are only running the 100W, then that's 50dBm out, less the 44dB coupling factor, so +6dBm peak out of the coupler. That's well below the safety limit of +13dBm, so no attenuator is required at all for either radio. +6dBm is also close to the optimum value for maximum signal-to-internal crosstalk level. Dump the attenuator for either radio.

73,

Scott

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