What is a Notch Filter and what is it's function?

[humanearth]

Can you answer this question?

Picture of a Manual Control Notch Filter

Updates

+1 y

A Notch Filter is also known as a Band Stop filter or Band Reject Filter. These filters reject/attenuate signals in a specific frequency band called the stop band frequency range and pass the signals above and below this band.

[Likes2drive]

To me it functioned more like a squelch to get rid of noise from other stations, not sure if that’s the answer you are looking for though

[humanearth]

by the way Thats a photo of my HF rig

[Likes2drive]

Looks like a nice old unit

[humanearth]

Yaesu FT 890 To me that new compared to my other much older HF rigs.

Heck I still have a working 6 meter mono band base radio made by Kenwood. I think it was made in the early 1970s

[Likes2drive]

Oldest one I have is the Uniden 2510 from 1992 I think

[humanearth]

I have a couple of them two.

My oldest might be my 1946s National two radio set Receiver and Transmitter

[Likes2drive]

I forgot I do have a walkie-talkie from Lafayette that has two CB channels built into it by changing the crystals , it’s about 50 years old

[humanearth]

I have a couple of Johnson Walkie talkies from the late 1960s

[Likes2drive]

You must have a nice collection of old stuff too from childhood

[humanearth]

you would love this oldie but a goodie

[exitseven]

that is what I was going to ssay.

[humanearth]

@exitseven I have a huge collection of Radios

Like this Dark Mark IX

[humanearth]

stupid spell check

[humanearth]

I have Royce, Johnson, Robyn, Tram and many many more

[exitseven]

@Likes2drive I had 2 Lafayette HA-70 walkie talkies when I was a kid.

[Likes2drive]

@exitseven I had one , my brother had the other one and I still have it in storage somewhere

[exitseven]

cool. i had a friend that had a pair of them too. I do not know what ever became of them. I had them for many years,

[Likes2drive]

@exitseven it was made completely of metal, chrome front and back was black, the antenna was about 4 feet long

[exitseven]

Mine were grey plastic from what i remember , They had a range of a quarter mile.

[humanearth]

@exitseven and @Likes2drive You radio nerds It all comes out now

[exitseven]

www.worldwidedx.com/.../index.html

They were ten bucks apiece.

[humanearth]

@exitseven Talk about memories

[exitseven]

Yes, I just fixed up this old beauty. HH Scott 342 C FM receiver. Made In USA.
https://imgur.com/DZsueYA

[humanearth]

@exitseven See You Should have your Ham ticket. You got the brains for it

[exitseven]

I actually studied for it way back when but never took the test. I still have the oscillator key. I built an oscillator from a kit I bought in Radio Shack. I put it in a little plastic box and mounted the key on top of it. If I put batteries in it , it probably would work.

[humanearth]

@exitseven You should and me and @Likes2drive can talk to you on the air

[humanearth]

The test is so easy these days. That kids as young as 8 are passing it now

[exitseven]

@humanearth truthfully. I can do a Skype session on the internet and actually see the person. it is like the Jetsons.

[humanearth]

@exitseven You can do the same with radio. Yes radio can do video to

[exitseven]

Really? how does tht work? is the video an analog signal?

[humanearth]

@exitseven You can do it analog or digital now. You can transmit both ways now.

I haven't done it, but my buddy does it often. If you really want to know. I can call him up and ask him