30W to 150W amp

RF transmitters : Reconn's World Forum

Attention! If you would like to post, but don't want to create your own account, use login:guest password:rw -- Enjoy!

Goto Topic: Previous•Next

Goto: Forum List•Message List•New Topic•Search•Log In•Print View

30W to 150W amp

Posted by: andrew ()

Date: June 27, 2003 11:52AM

Other Details unknown

Options: Reply•Quote

Re: 30W to 150W amp

Posted by: George ()

Date: October 04, 2003 06:12AM

what is RFC anyway....?

Options: Reply•Quote

Re: 30W to 150W amp

Posted by: Chris ()

Date: November 27, 2003 04:55AM

If you don't know what an RFC is, you shouldn't consider building any RF amplifier.

Options: Reply•Quote

Re: 30W to 150W amp

Posted by: Harry ()

Date: November 28, 2003 10:03PM

This is an RF amplifier - NOT an audio amp. Is it posted in the wrong section?

Options: Reply•Quote

Re: 30W to 150W amp

Posted by: andrew ()

Date: December 01, 2003 12:05AM

Ah, thank you. topic is now moved

Options: Reply•Quote

Re: 30W to 150W amp

Posted by: Tuska ()

Date: March 04, 2004 12:00AM

Quote

(andrew @ June 27 2003,11:52):

Other Details unknown

Can this RF Amp work on 80m SSB?
sad emoticon

Options: Reply•Quote

Re: 30W to 150W amp

Posted by: Shawn ()

Date: May 04, 2004 01:25PM

Quote

(Guest @ Oct. 04 2003,06:12):
what is RFC anyway....?

an RFC is just an RF Choke. In otherwise it's a manner of filter. No big deal. Get a reputable RF book and start reading. You will enjoy yourself, I assure you. smiley

Options: Reply•Quote

Re: 30W to 150W amp

Posted by: IT9TTH ()

Date: May 01, 2005 12:55AM

Hi to all ..
Yes the base of the transistor has to have a return to ground.
The RF choke will provide it and prevents RF from the driver to go (waste) to ground.
If this RF Amp can be used on 80m SSB:
with the proper scaling of C and L yes .. BUT for SSB you need a LINEAR Amplifier, class A ideal but .. veeery inefficient, class B is acceptable.
The amplifier in question is operating well into class C - the result: spurs and harmonics all over the spectrum.
Cheers,
- Angelo

							\| May 22, 2013
			Home Forum!! *Robotics Projects:* Smallbot *Electronics Projects:* SMT Reflow Serial Multiplexer *Project Log:* Current Projects My Bench Equipment				RF transmitters : Reconn's World Forum Attention! If you would like to post, but don't want to create your own account, use login:guest password:rw -- Enjoy! Goto Topic: Previous•Next Goto: Forum List•Message List•New Topic•Search•Log In•Print View 30W to 150W amp Posted by: andrew () Date: June 27, 2003 11:52AM Other Details unknown Options: Reply•Quote Re: 30W to 150W amp Posted by: George () Date: October 04, 2003 06:12AM what is RFC anyway....? Options: Reply•Quote Re: 30W to 150W amp Posted by: Chris () Date: November 27, 2003 04:55AM If you don't know what an RFC is, you shouldn't consider building any RF amplifier. Options: Reply•Quote Re: 30W to 150W amp Posted by: Harry () Date: November 28, 2003 10:03PM This is an RF amplifier - NOT an audio amp. Is it posted in the wrong section? Options: Reply•Quote Re: 30W to 150W amp Posted by: andrew () Date: December 01, 2003 12:05AM Ah, thank you. topic is now moved Options: Reply•Quote Re: 30W to 150W amp Posted by: Tuska () Date: March 04, 2004 12:00AM Quote (andrew @ June 27 2003,11:52): Other Details unknown Can this RF Amp work on 80m SSB? Options: Reply•Quote Re: 30W to 150W amp Posted by: Shawn () Date: May 04, 2004 01:25PM Quote (Guest @ Oct. 04 2003,06:12): what is RFC anyway....? an RFC is just an RF Choke. In otherwise it's a manner of filter. No big deal. Get a reputable RF book and start reading. You will enjoy yourself, I assure you. Options: Reply•Quote Re: 30W to 150W amp Posted by: IT9TTH () Date: May 01, 2005 12:55AM Hi to all .. Yes the base of the transistor has to have a return to ground. The RF choke will provide it and prevents RF from the driver to go (waste) to ground. If this RF Amp can be used on 80m SSB: with the proper scaling of C and L yes .. BUT for SSB you need a LINEAR Amplifier, class A ideal but .. veeery inefficient, class B is acceptable. The amplifier in question is operating well into class C - the result: spurs and harmonics all over the spectrum. Cheers, - Angelo Options: Reply•Quote Goto: Forum List•Message List•Search•Log In Array Sorry, only registered users may post in this forum. Click here to login This forum powered by Phorum.