Hi-Wattage 2-pills...How?

[wyatt joshua d]

There's been some discussion on the newsgroup about the Davemade M80's,
the X-Force, and some modified Texas Star 350's running close to 600 watts
peak, with only two 2879's. And at 14.7 volts!
How is this accomplished? I don't doubt the claims at all. Is it output
matching? Upgraded output transformers?
I haven't seen any of these amps (I live in an area where competition amps
don't make much of an appearance). Can anyone shed light on the design
ideas, methods, or just physically describe the inside (wraps on transformers,
values of capacitors that are in paralell, etc.)?
Thanks,
Josh

[ICECOLDNYC]

In article <77p8mp$sas$1...@hubcap.clemson.edu>, jdw...@hubcap.clemson.edu (wyatt
joshua d) writes:

Well first off the comparing of the M-80 to the TX-350 is wrong. Reason being
the M-80 is 2X2290 transistors in it. The TX-350 has 2X2879 transistors in it.
If they are comparing to the davemade amps they probably should compare to the
davemade M200 or the 200. Both of these amps have more heatsink, bigger case
and a fan for both. The M200 is 1(2290) driving 2(2879).

ICE, ICE, AND MORE ICE MR. ICECOLD BIG APPLE TREES JUST GOT DOWN........

[XFORCE827]

AND THE AX-400 X-FORCE AMP IS 2x2879'S ALSO

827 GONEEEEEE

[CitySlicker]

I am really confused. When I look at exports r us list they show the AX-400
being 1-2290 x 4-2290.

XFORCE827 wrote in message <19990116043229...@ng-cd1.aol.com>...
:AND THE AX-400 X-FORCE AMP IS 2x2879'S ALSO
:
:827 GONEEEEEE

[JoeArmy99]

I don`t know about 14.7 volts but I`ve seen a 2 pill driven with a 2 pill at 20
volts and do well past 600

[Sean]

Ice, I compared the X-Force to the M80 ONLY IN PHYSICAL SIZE. I
never mentioned the output of an M80 once, since it isn't
directly comparable. As you mentioned, the Dave Made 200 would
be the equivalent of the X-Force AX-400. Sean
>
ICECOLDNYC wrote in message
<19990116035057...@ngol02.aol.com>...

[ICECOLDNYC]

In article <77qgab$p5a$1...@news.megsinet.net>, "Sean" <bigf...@megsinet.net>
writes:

>Ice, I compared the X-Force to the M80 ONLY IN PHYSICAL SIZE. I
>never mentioned the output of an M80 once, since it isn't
>directly comparable. As you mentioned, the Dave Made 200 would
>be the equivalent of the X-Force AX-400. Sean

Oh OK Cool Sean.

[MC TURNER]

In short it is called PILEDRIVING. You slam a bunch of watts into a two pill box
and you get big numbers out. The final pills saturate and cause real bad
harmonics causing the high readings. You can defiantly get some volume out of a
two pill in this config though. That is if you don't care how clean it is. I am
hitting each 2879 with 60+ watts to get about 320 watts out of each 2879. All
well and good. But how much of this in on 27MHZ?

MC

[Sean]

If you don't have access to a spectrum analyzer, look at a good
scope that reads well above 100 Mhz with good accuracy and that
should tell you quite a bit of info. These babies look beautiful
and much cleaner than other production amps running at much lower
power levels.

If the "big numbers" weren't on the band with these boxes and
were only doing the "clean" numbers that you quoted, they
wouldn't be able to SMASH other boxes that were showing lower
"more realistic" numbers so easily.

We can talk specs all day long, but what does it do on the air
??? Sean
>
MC TURNER wrote in message <36A4F6E1...@IX.NETCOM.COM>...

[Toll Free]

Or 20 volts on the collectors!

Toll Free

UpINdapool wrote in message <19990121224517...@ng139.aol.com>...
>2 120 watt pills don't ever do 600 watts unless you drive them with 590
watts
>the end .........the trick is in the meter or a rotten ant match....

[UpINdapool]

[Sean]

I watched 711 key at 5 watts and modulate to 310 rms using a Dave
Made M200 in his vehicle holding about 14.9 to 15.0 volts steady.
This was using an antenna that showed appr 1 watt reflected on
his Bird 43. He was using this as a driver into his 8 pill Dave
box. You folks can think what you want. Sean
>
Toll Free wrote in message ...

>Or 20 volts on the collectors!
>
>
>Toll Free
>
>UpINdapool wrote in message
<19990121224517...@ng139.aol.com>...

[Andy Moss]

Sean wrote:
>
> I watched 711 key at 5 watts and modulate to 310 rms using a Dave
> Made M200 in his vehicle holding about 14.9 to 15.0 volts steady.
> This was using an antenna that showed appr 1 watt reflected on
> his Bird 43. He was using this as a driver into his 8 pill Dave
> box. You folks can think what you want. Sean

If he has 310 real Watts going up the pipe with a 5W carrier, what he
has is a double sideband transmitter. Some of the newer rigs can be
easily bastardized to do this as they use a DSB generator with carrier
re-insertion. Given that the carrier exists to demodulate the
intelligence at the receiving end, you'll be making more heat than
light. Not surprisingly, there's no benefit to this (real or
perceived). 8-)

[Sean]

I would believe this if he didn't win keydowns running this amp.
It is "on band" power or else he would be getting his ass kicked.
I have seen radios do the "double sideband" phenomena, especially
CPI's. Sean
>
Andy Moss wrote in message <36A8CD...@ibm.net>...

[Andy Moss]

Sean wrote:
>
> I would believe this if he didn't win keydowns running this amp.
> It is "on band" power or else he would be getting his ass kicked.
> I have seen radios do the "double sideband" phenomena, especially
> CPI's. Sean

Clearly, he's using his opponents carrier power to demodulate his big
sidebands at the receiving end. 8-) This guy deserves the prize for
using his head!

Cheers!
Andy

Put him on his own and