Its just 2 or 3 dB's more rf-amplifer gain ... as you can see it also amplifies the background noise ... in many cases it will make it worse, in particicular in noisy urban areas.
Is it just a pre-amp ? Do a test with other similar radios (non SDX) side by side same antenna. Maybe test alongside a real pre-amp mounted at the feed point (which is where it should be). I can see the value of having such a feature in a mobile rig, but why wouldn't you just leave it on all the time ? Just thinking it maybe some marketing trick to attract new operators without experience.
Its just 2 or 3 dB's more rf-amplifer gain ... as you can see it also amplifies the background noise ... in many cases it will make it worse, in particicular in noisy urban areas.
Thanks
From the tests I have seen, Asp actually made the weak signals worse.
Oh
That's not the way I heard it when demonstrated on ML&S's channel. It boosted the readability quite noticeably.
@@iandobson8846 Its possible the S-DX on the new radios is a different 'version' and works better. FTM500 seems like its just a preamp
I have owned my 500 for over a year, it’s just a waste of a button on the FTM-500.
Lol
Is it just a pre-amp ? Do a test with other similar radios (non SDX) side by side same antenna. Maybe test alongside a real pre-amp mounted at the feed point (which is where it should be). I can see the value of having such a feature in a mobile rig, but why wouldn't you just leave it on all the time ?
Just thinking it maybe some marketing trick to attract new operators without experience.
Ok
My thoughts are that it helps improve strong signal performance when NOT on. I've not attempted to test that theory though.