Sidebar Sidebar
  • You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.

3cx10000 Ouput Test

Drifter

Drifter

Active Member
Aug 2, 2005
382
83
38
Under a coconut tree in the Carribbean sipping on
YouTube - 3CX10.000A7 OUTPUT TEST

YouTube - My new 3CX10,0000A7

3CX10,000A7

THIS IS A 3CX10,000A7 CONSOLE UNIT. Output power 5000+ watts maximum 450 watts bird and 1000 peak will give you 15Kw+ peak output Tube - 3CX10,000 test full power output Transmit/Receive switching 60 + Amps open Vacuum relay Power-line requirements 200/240 Vac 50/60 HZ 50+ or - Amps at 240 Vac Power Supply Heavy duty 3.5 peak amp steel core transformer and high capacitance grade filter capacitor, also features time delay starting to protect the tube from over current load. "Soft Start-
 
Last edited:

Now if the cam would move to the right hand side of the Bird, everyone would see that the peak kit is installed on this meter and turned on. While keying 15 KW swinging 25 KW PEP may look impressive, it's not at all when you realize you need 60 KW PEP to properly modulate a 15 KW AM carrier. Turn the peak kit off and watch the 15 KW carrier swing down to about 7 or 8 KW average under full modulation conditions. He don't show what the plate current meter does when you modulate but I'll bet it's going backwards at that carrier.
 
Shockwave said:
Now if the cam would move to the right hand side of the Bird, everyone would see that the peak kit is installed on this meter and turned on. While keying 15 KW swinging 25 KW PEP may look impressive, it's not at all when you realize you need 60 KW PEP to properly modulate a 15 KW AM carrier. Turn the peak kit off and watch the 15 KW carrier swing down to about 7 or 8 KW average under full modulation conditions. He don't show what the plate current meter does when you modulate but I'll bet it's going backwards at that carrier.
Click to expand...

And we thought we had an AM hero and you come along with your krytonite.
 
mackmobile43 said:
And we thought we had an AM hero and you come along with your krytonite.
Click to expand...

Its no secret that there needs to be a 6db difference between carrier and peak for a full 100% modulated AM signal. This is true whether its 1 watt swinging to 4 watts or 15kw swinging 60kw. Shockwave is 100% correct. That setup would benefit by dropping the carrier to 5 kw and peaking at 20kw. Just my 2 cents
 
Exactly! When you see the dampening effect after modulation peaks on the Bird, you know it's PEP watts. When you know linear amplifiers and see that video, you also know you have an amplifier that falls short of being able to modulate half of what's it's keying now. It would run OK at about 5 KW carrier on AM. I've seen a 3CX3000A7 do this power on PEP and a 3CX6000A7 blow the PEP board right up in the Bird.

If the goal in this video was to demonstrate he has the ability to build and test a linear amplifier, the watt meter alone is proving the amplifier is not even running close to linear. Then you have those volt and amp meters. Showing 60 volts at 20 amps for 15 KW carrier. Or was it meant to reflect 6000 volts at 2 amps? That would only mean the amp was running at about 120% efficiency....LOL.

If that is Wizards shop, he should get a scope and a Bird RF sampler for that line section and compare those small positive peaks with flat tops against the big negative peaks with RF cutoff. I also find 450 watts drive for 15 KW carrier at over 33 times power multiplication on a triode more then I'll believe. That tube runs around 12db gain and that means the drive requirements should be closer to double what is claimed.
 
What does that take? 250A @ 220VAC considering about 50% efficiency?

Triple naught cable?
 
Shockwave said:
Exactly! When you see the dampening effect after modulation peaks on the Bird, you know it's PEP watts. When you know linear amplifiers and see that video, you also know you have an amplifier that falls short of being able to modulate half of what's it's keying now. It would run OK at about 5 KW carrier on AM. I've seen a 3CX3000A7 do this power on PEP and a 3CX6000A7 blow the PEP board right up in the Bird.

If the goal in this video was to demonstrate he has the ability to build and test a linear amplifier, the watt meter alone is proving the amplifier is not even running close to linear. Then you have those volt and amp meters. Showing 60 volts at 20 amps for 15 KW carrier. Or was it meant to reflect 6000 volts at 2 amps? That would only mean the amp was running at about 120% efficiency....LOL.

If that is Wizards shop, he should get a scope and a Bird RF sampler for that line section and compare those small positive peaks with flat tops against the big negative peaks with RF cutoff. I also find 450 watts drive for 15 KW carrier at over 33 times power multiplication on a triode more then I'll believe. That tube runs around 12db gain and that means the drive requirements should be closer to double what is claimed.
Click to expand...

And again the pep vs "bird watts" issue arises when we all know that pep is the only true measurement of an amplitude modulated signal so all previous arguments are null and void as they pertain to this amplifiers output and it's builders claims of it's output.

If I recall he never claimed his meters readings to be either pep or "BIRD WATT".
 
On another forum Wizard was testing an amp, maybe this same one, and said he only had a 50 amp service at his bench and the amp was not showing full peak power because it was starving for current. This just shows he has no clue about electricity. If an amp wanted to draw 80 amps from a 50 amp circuit it would attempt to do until the breaker/fuse popped. The amp would never be current starved the fuse would simply blow. BTW, I have never been able to figure how something can me current starved when operated from the AC line, voltage starved yes, but not current starved.
 
mackmobile43 said:
And again the pep vs "bird watts" issue arises when we all know that pep is the only true measurement of an amplitude modulated signal
Click to expand...
I don't buy that. When I add compression to my signal, it sounds louder at the receiving station, my avg wattage will climb slightly while the pep wattage remains constant.
 
359 said:
I don't buy that. When I add compression to my signal, it sounds louder at the receiving station, my avg wattage will climb slightly while the pep wattage remains constant.
Click to expand...

May be your meter is not designed to register pep accurately.
 

dxChat
Help Users
  • No one is chatting at the moment.
  • @ Wildcat27:
    Hello I have a old school 2950 receives great on all modes and transmits great on AM but no transmit on SSB. Does anyone have any idea?
  • @ BJ radionut:
  • @ ButtFuzz:
    Good evening from Sunny Salem! What’s shaking?
  • dxBot:
    63Sprint has left the room.
  • dxBot:
    kennyjames 0151 has left the room.


      Top Bottom
      Back