Re: [AFMUG] antenna gain from return loss spec?

2016-09-02 Thread Chuck McCown
Excellent question... -Original Message- From: Ken Hohhof Sent: Friday, September 02, 2016 5:29 PM To: af@afmug.com Subject: Re: [AFMUG] antenna gain from return loss spec? Hmmm, so Ubiquiti is just choosing not to publish the gain vs freq information. Pretty much all dishes have a

Re: [AFMUG] antenna gain from return loss spec?

2016-09-02 Thread Ken Hohhof
gain? -Original Message- From: ch...@wbmfg.com Sent: Friday, September 02, 2016 6:23 PM To: af@afmug.com Subject: Re: [AFMUG] antenna gain from return loss spec? Yes, but your return loss would have to be much worse than this to have a noticeable effect. Think of it this way: A 3dB RL

Re: [AFMUG] antenna gain from return loss spec?

2016-09-02 Thread chuck
I always spec'd my gains as measured system gains with the RL effects, so the gain I spec is the gain you get. -Original Message- From: ch...@wbmfg.com Sent: Friday, September 2, 2016 5:23 PM To: af@afmug.com Subject: Re: [AFMUG] antenna gain from return loss spec? Yes, but

Re: [AFMUG] antenna gain from return loss spec?

2016-09-02 Thread chuck
) means you are losing .457 dB. Most antenna manufacturers shoot for 14 dB minimum. That is a .17 dB loss of gain. -Original Message- From: Ken Hohhof Sent: Friday, September 2, 2016 5:13 PM To: af@afmug.com Subject: [AFMUG] antenna gain from return loss spec? If a 5 GHz band antenna has

Re: [AFMUG] antenna gain from return loss spec?

2016-09-02 Thread Jeremy
Don't forget to account for cable loss. Also, some of the old Rocket dishes (23) are actually 21. I ran into that on the AF5X and that is the info from support. On Fri, Sep 2, 2016 at 5:13 PM, Ken Hohhof wrote: > If a 5 GHz band antenna has a gain spec of 23 dBi and a graph of return > loss vs

[AFMUG] antenna gain from return loss spec?

2016-09-02 Thread Ken Hohhof
If a 5 GHz band antenna has a gain spec of 23 dBi and a graph of return loss vs frequency, is there a way to translate this into gain vs frequency? We put up an AF5x link today with the 23 dBi antennas and actual Rx signal was 6 dB less than ideal. But that would make sense if the antenna gain