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Phasing Antennas


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#21 n4gix

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Posted 09 March 2019 - 06:44 PM

That is precisely what it was, an OTH backscatter array. The transmitter was located about 70 km from this receiving array so it wouldn't cause any desense issues.



#22 w2xab

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Posted 11 March 2019 - 08:23 AM

If you are talking about stacking one antenna atop the other to get 3-db of additional gain, it requires a new factory phasing harness.

 

If you plan on mounting them otherwise, you would be better to us a voter and a second receiver for phase diversity on receive and can gain 6-db or more on RX.

 

If you are using a duplexer and the antennas are phased incorrectly (harness and/or spacing); it can create some bad TX patterns including rapid fading for mobiles.

 

One of the advantages of using a voter is you can add a high gain preamp (may require a bandpass filter also) and greatly improve handheld coverage.

 

 



#23 taco6513

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Posted 17 March 2019 - 11:52 AM

Going forward with one single DB420 and 220 feet of 1 5/8 heliax cable. Just told by tower owner that is all free for me to use. So I can't bit*h to much.

Trade off is I buy, install, service, and maintain a standby generator. It is on it's way. Be here next week. 

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