Low Pass Filter for 2 Meters VHF Radio

[OA4AJP]

What type of filter do you advice me, the ButterWorth or the Cebychev?

I will use the filter with an APRS VHF transmitter

Thanks.
Alfredo Mendiola Loyola
OA4AJP

[G0CWA]

What type of filter do you advice me, the ButterWorth or the Cebychev?

I will use the filter with an APRS VHF transmitter

Thanks.
Alfredo Mendiola Loyola
OA4AJP

Hi Alfredo

I don't think it matters which type you use as long as it is lowpass, both do the same job, I have always used chebby ones personally.

I don't know if Gary agrees, I'm hoping he does

Hope this answers your question

73 de Nick G0CWA

[G0CWA]

Is there any Harmonic calculator to get the second and third harmonic from a frenquency.

OA4AJP

Hi again Alfredo sorry missed that question, there is no need for a calculator the harmonics are as follows depending on how you were draggged up in electronics.

The "first" (also known as the fundimental) is 1x the frequency

the 2nd harmonic is simply 2x the frequency

3rd = 3x
4th = 4x
etc.

The method I have given you is the answer to your question. Hope this helps you

TTFN Nick

[KO6WB]

Hey, what happened to my lengthy well thought out posting? Really I did answer this a few days ago on the 9th.
Okay, too late now to be much help but yes Nick I agree with you.
What Alfredo needs to do is to get the attenuation value at 290Mhz and subtract the amount of attenuation the amplifier has already from the total attenuation desired.
Have fun
73
Gary