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RF attenuators for TX


Tobi A
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I'm thinking of adding some inline RF attenuators to my links/hops transmitters in my bag setup, to help my recievers out with spray etc.

I'm using smqv and the min power output is 50mW, I think half that or even less would be enough from my bag to camera which is usually close.

Has anyone one done be this? I recall a discussion somewhere but can't find it now.

 

How much attenuation would I need? 5db, 10db? If anyone knows the formula that would be amazing!

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Rule #1 is have at least 50mhz of separation between hops and bag Rx. Rule #2  get hop tx away from Rx. Rule #3 use Rx with a "tight" front end filter (411!)

 

I think a 3db attenuator would effectively cut the power in half, but now you have an awkward tx antenna situation that could easily result in a broken SMA connector.

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I think using an app like FreqFinder to make sure you don't have any inter-modulation would help more than trying to reduce the power.  Spacing bag hops as far away (and make sure they don't conflict frequency wise) goes a long way!

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SMA type 3dB attenuators should work very well in that application. If you are getting plenty of range with say 25 mW coming out of your hop transmitter/s, then this is a good option. They will make the antenna/base connector about 3/4" longer, as Jason mentioned. 

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