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White noise filter or new better radio?

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ForestRunner98

917 SoCal
Joined
Jan 19, 2020
Messages
42
Hey everybody!

I am new to CB and so far I am enjoying the hobby and this site. I lurked for a bit. I first installed my radio for off-roading but listening and taking I am getting into it.

So here’s my issue. My radio is a Cobra 18 WX STII. I know not the best by far. It does not have a NB/ANL switch/button or RF adjustment. I receives and transmits clear. About 3-5 miles on a 4’ Firestik. Swr’s are at 1.3 - 1.5 So far so good but I like to have to squelch turned down so I can hear more talk come in but that hiss gets to me after a while. Is there some inline noise gate/filter to cut some of that high hiss?? Or should I get a better radio with those features?

Thanks for your time helping this noob out!!
 

sloop

Member
Joined
Jul 19, 2008
Messages
348
Location
Lewisville, NC
That background hiss is normal atmospheric noise for AM CB's. The squelch is used to block it out. Sometimes it will almost disappear and at other times it will be 'full scale'. The ANL (if you had one) would help a little but the noise will still be there, just not as loud.
 

ForestRunner98

917 SoCal
Joined
Jan 19, 2020
Messages
42
The ANL (if you had one) would help a little but the noise will still be there, just not as loud.

Is there anything I can use inline to cut some of the “edge” off.

The white noise will go away when you set the squelch properly or when someone keys up.

It does go away during those instances. Just looking to quiet down that high hiss a bit.

Maybe one of those cheap NR400 noise clippers set at the minimum level? Maybe I am over thinking this.LOL
 

prcguy

Member
Premium Subscriber
Joined
Jun 30, 2006
Messages
15,692
Location
So Cal - Richardson, TX - Tewksbury, MA
Here is one of many products that you can install inside the radio and get really good noise reduction. One of the links has a audio file of what to expect and I've heard these in use and they are impressive. Click on the 20m SSB file on the home page to hear it. Only problem is it costs more than the OPs radio.


 

ForestRunner98

917 SoCal
Joined
Jan 19, 2020
Messages
42
I think you're expecting professional radio performance from a budget radio with mixed reviews.

A CB Radio isn't expected to be hi-fi.

I wouldn't spend too much more on it.

Good luck!

I think your right. Wasn’t really looking for pro results but the radio isn’t clearly the best. So I guess it’s expected. Bought because thebpeoce Gives me a reason to buy a nicer radio down the line!

Thank you!!
Here is one of many products that you can install inside the radio and get really good noise reduction. One of the links has a audio file of what to expect and I've heard these in use and they are impressive. Click on the 20m SSB file on the home page to hear it. Only problem is it costs more than the OPs radio.



Wow...that was impressive!! But ya, it cost more the radio.

Thank you!!
 

JayMojave

Member
Joined
Dec 13, 2007
Messages
722
Location
Mojave Ca
Yeah what PRC Guy said, good call there. I use a DSP unit that is wired in from the radios speaker output, and the speaker is plugged into the DSP Unit. Works great reducing noise and such in the radios audio output.

The DSP unit was $199.oo years ago, but if one whats to play, one has to pay. I have a Stryker 955 AM and SSB radio and the DSP really works good.

Jay in the Great Mojave Desert
 

jassing

Member
Premium Subscriber
Joined
Jan 31, 2012
Messages
282
Location
Shelton, WA
You can try something like noise clipper or a DSP enabled speaker. (the latter may be cost prohibitive for a modern DSP unit)
I have had good (not great) results from a old radio shack DSP-40. I replace some capacitors and slightly modify the board to improve performance). You can expect to find them on ebay; used sub $50, NOS sub $90. I recommend searching the web for mods & performing them.
( I have done a couple dozen for people & had only 1 say that the mods made it worse)

There are modern units for around $100-200.

Any DSP type unit will typically see better performance with ssb or cw.

Nothing will get rid of all that am hum, except a good strong signal.
 

FiveFilter

Member
Joined
Jan 1, 2016
Messages
308
Yeah, I just squeeze out the background noise with the squelch knob using as little squelch power as possible. It works for me.
 
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