Go Back   WorldwideDX Amateur Radio Forums > Amateur Radio Related > Amplifiers


Amateur Callsign Lookup
Enter Callsign:

Which amp to go with

Reply
 
LinkBack Thread Tools Display Modes
  #17  
Old 03-22-2011, 01:33 PM
359's Avatar
359 359 is offline
Senior Member
iTrader: (1)
 
Join Date: Jun 2010
Location: Ohio
Posts: 1,804
359 is on a distinguished road
Default


Yeah, I new that class A used 360* of the waveform and class B 180*, leaving C below B and AB between A&B. I guess I just wasn't sure, or maybe I was, what exactly happened to the missing part of the signal. I think the key part of running class C is the filtering, or lack there of in the competition style amps, to keeping unwanted signals out of stuff it wasn't meant to be in.

Good info BTW Eagle.
__________________
"Contradictions do not exist. Whenever you think that you are facing a contradiction, check your premises. You will find that one of them is wrong."
- Ayn Rand (1905-1982)

Reply With Quote
  #18  
Old 03-22-2011, 01:40 PM
eagle1911's Avatar
Senior Member
iTrader: (0)
 
Join Date: Jan 2011
Posts: 328
eagle1911 is on a distinguished road
Default

Tnx, I hope it helped! Sorry I kept editing over and over. I kept finding better ways of explaining things as I understand them..

Reply With Quote
  #19  
Old 03-22-2011, 03:10 PM
WR0220's Avatar
Senior Member
iTrader: (1)
 
Join Date: Oct 2008
Location: DX Land
Posts: 409
WR0220 is on a distinguished road
Default

Quote:
Originally Posted by eagle1911 View Post
...I've long been of the opinion that, given the extremely low cost of a rudimentary bias scheme and integral low-pass filtering, unfiltered class C boxes are really a bad idea. I've never been able to figure out why there are so many floating around.. Is it so the manufacturers save the $5-10 that the bias circuit and 11m LPF cost? Is it because the buyers can't be bothered to drop the extra few bucks for a cleaner amp? IDK.. it's just never made much sense to me...
If the competition amp manufacturers changed bias and added filtering then their customers couldn't get on the forums and brag that they have a 2 pill that does 800 watts pep.

Good info you posted - if only more people would look at it that way, but most are only concerned with the (big) numbers they see on their meter...even if the majority of it is IMD and harmonics...
__________________
WR0220
CPI Cobra Icom Yaesu

Reply With Quote
  #20  
Old 03-23-2011, 07:13 AM
Junior Member
iTrader: (0)
 
Join Date: Sep 2008
Posts: 17
smp440 is on a distinguished road
Default

Wow, Thanks for all the good input. I never knew why some people didn't like class C amps, other then them saying they were'nt as clean so ( I just got schooled ) lol... But that is really good stuff.
So What should I be Looking for. A class AB like TNT or older messenger maybe a palomar ( new or used better? ) or something else...
If I understand correctly, if I go with a better class amp. I can go with lower watts because they transmit more wave in the correct carrier so it will sound just as loud as a class c with more watts? And it wont splatter everything else!

Reply With Quote
  #21  
Old 03-23-2011, 07:39 AM
359's Avatar
359 359 is offline
Senior Member
iTrader: (1)
 
Join Date: Jun 2010
Location: Ohio
Posts: 1,804
359 is on a distinguished road
Default

Quote:
Originally Posted by smp440 View Post
So What should I be Looking for. A class AB like TNT or older messenger maybe a palomar ( new or used better? ) or something else...
If I understand correctly, if I go with a better class amp. I can go with lower watts because they transmit more wave in the correct carrier so it will sound just as loud as a class c with more watts? And it wont splatter everything else!
I *think* TNT amps are only class B, not AB, but somebody correct me if I'm wrong.

Again, somebody correct me if I'm wrong, but the class C will sound louder because of the distortion. Some distortion in broadcast is intentionally added to increase the perceived volume. A good example would be commercials on radio and TV.

I've only ever owned 1 transistor mobile amp, and I'm not even currently using that, so I could wrong for sure. I've owned 4 or 5 base tubers, so I guess I've just never really paid much attention to the pill boxes.
__________________
"Contradictions do not exist. Whenever you think that you are facing a contradiction, check your premises. You will find that one of them is wrong."
- Ayn Rand (1905-1982)

Reply With Quote
  #22  
Old 03-23-2011, 07:43 AM
eagle1911's Avatar
Senior Member
iTrader: (0)
 
Join Date: Jan 2011
Posts: 328
eagle1911 is on a distinguished road
Default

Quote:
Originally Posted by smp440 View Post
If I understand correctly, if I go with a better class amp. I can go with lower watts because they transmit more wave in the correct carrier so it will sound just as loud as a class c with more watts? And it wont splatter everything else!
In reality, a lot of the "loudness" associated with audio from class C amps is caused by distortion.. It's kind of like what happens when you add distortion to a guitar. The sound feels "louder"..

Basically one must choose whether they want balls-to-the-wall power on their meter and all the distortion, dirt and trash that comes with it, or if they want slightly less power on the meter (and it's typically not a HUGE difference really..), but CLEAN power that is confined to the frequency you are using.

You are correct though, with unfiltered class C amps much of the power that is measured at full drive is from harmonics, which lend nothing to your ability to "get out" on the frequency you're trying to use..

And yes, according to TNT their amps are class B, but that's still an improvement over class C.

Last edited by eagle1911; 03-23-2011 at 09:13 AM.

Reply With Quote
  #23  
Old 03-23-2011, 09:58 AM
WR0220's Avatar
Senior Member
iTrader: (1)
 
Join Date: Oct 2008
Location: DX Land
Posts: 409
WR0220 is on a distinguished road
Default

Quote:
Originally Posted by 359 View Post
...Some distortion in broadcast is intentionally added to increase the perceived volume. A good example would be commercials on radio and TV...
I agree that the addition of distortion will increase the perceived volume, but I also think that the use of compression also increases the perceived volume of commercials.
__________________
WR0220
CPI Cobra Icom Yaesu

Reply With Quote
  #24  
Old 03-23-2011, 10:18 AM
359's Avatar
359 359 is offline
Senior Member
iTrader: (1)
 
Join Date: Jun 2010
Location: Ohio
Posts: 1,804
359 is on a distinguished road
Default

Quote:
Originally Posted by WR0220 View Post
I agree that the addition of distortion will increase the perceived volume, but I also think that the use of compression also increases the perceived volume of commercials.
I was under the impression that compression did increase distortion. Clipping more so than limiting, but distortion all the same.
__________________
"Contradictions do not exist. Whenever you think that you are facing a contradiction, check your premises. You will find that one of them is wrong."
- Ayn Rand (1905-1982)

Reply With Quote
Reply

Bookmarks

Tags
amps, dave made, fatboy, texas star, xforce
Worldwide Radio Forum



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
high swr when amp on. flat swr when amp off iceman78 Amplifiers 14 03-29-2012 06:08 AM
Problem with amp romakdaddy General CB Services Discussion 2 02-06-2011 01:40 PM
Some Archives of the Old Forum Sonwatcher Announcements & Open Forum 10 12-03-2009 06:50 PM
Need Help Setting Up Radio Neuro CB Band and CB Radios 24 06-10-2009 01:30 PM


All times are GMT -7. The time now is 03:58 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0
Worldwide Radio Forum