does anyone else have a radio with the galaxy noise filter and am i the only one who finds it very useless and it makes the audio sound like your on an airplane. or what i would call Modulated static.
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Galaxy Noise Filter
- Thread starter bigred222
- Start date
If you leave it on long enough you might get adapted to how things sound but I tried already. A good high cut filter would be useful.
BHI do an external speakers as well as PCB modules. They're quite effective and have several levels of aggressiveness. I've used one in the past and found it better than the AF DSP noise reduction in my amateur radios.
They do speakers but also do just the circuit board so you can mount it inside your radio and hook it up to the internal speaker. It requires just a small hole drilling for the switch and one for the LED.
I'm sure they're available in the USA or they'll ship them there.
Noise Cancellation Products
They do speakers but also do just the circuit board so you can mount it inside your radio and hook it up to the internal speaker. It requires just a small hole drilling for the switch and one for the LED.
I'm sure they're available in the USA or they'll ship them there.
Noise Cancellation Products
There used to be a little analogue inline noise filter called the Lake nrf2, they were pretty good for 17 quid or so, about 30 dollars, sounded much nicer on the ears than any dsp i ever heard, i don't think they are still made but possibly show up 2nd hand from time to time.
The big problem is that everything today is done at the audio level and not at the IF level where it should be done.Audio DSP is so much cheaper and easier to implement. Noise blankers and DSP filters as well as speech processors that operate at the IF level are far superior to those that operate at the audio level. In the case of a noise blanker, sure you can reduce or eliminate the noise but it greatly affects the audio and you still need a really strong signal to overcome the noise. When done at the IF level you are dealing with RF and you can filter and tailor the signal better without affecting the audio nearly as much as well as hear much weaker signals thru the noise. As for speech processing, my Kenwood TS-820S has a thirty year old processor that runs circles around my FT-857D's processor which is typical of most modern rigs.
To be fair, in the recent crop of radios that've been released, the TS590, FT950,1200,3000, Icom 7100,7410 they have finally moved from AF DSP to IF DSP.
Can't beat an old analogue rf speech processor, was some gems in the old days, but as you say a lot cheaper to do it at AF than RF frequencies
There is a piece of Ham gear out there (forget the brand ATM) that is a selectable band pass filter for the antenna end. This can eliminate much of the noise. Serious Ham contesters use it, you can Google it and find out the brand. It is reasonably priced BTW. Been thinking about getting one too . . .
Yes that is true and just proves that doing things at the audio level was the wrong approach. At least the manufacturers recognized the errors of their ways.