fatboy failure

[dx31353]

It's not what's on the outside but rather what's on the inside that matters. Do you buy a car and not know how many cylinders it has under the hood?

I understand what you are saying. You gotta know what your running and have at least a basic understanding of how it works

Sent from my SCH-I545 using Tapatalk

 

[wavrider]

I think a Fatboy needs to be driven with a slim shady driver into fireball coax feeding a Jo gunn antenna..

Holy Cow a dream station

 

[Shockwave]

Once you know the gain of the 2879 is more than the 2290, this 3 pill makes as much sense as putting an Ameritron AL80 in front of a Heathkit SB-220. Sooner rather than later you're going to let the smoke out. The 2290 can do about four times the drive a pair of 2879's requires and driving this 3 pill with just about any radio is going to insure it's over driven that hard. Most regular radios can drive a pair of 2879's good and anything more just creates lots of IMD. Sorry to say anyone who builds you a 3 pill is treating you like a jacka$$.

 

[The Bruce]

Bought a Fatboy 1x2290/2x2879 and have it mated to a Galaxy 739. First day blew some kind of transistor and fatboy fixed for 70 bucks. It lasted another day and blew finals. Pushing it with 5 watts, 1.4 swr, 10 gauge positive and ground. Somebody tell me what is wrong, PLEASE.

Galaxy 739? Is that a typo? I can't find it anywhere.

All things aside, you're overdriving your amplifier. Lower your dead-key to under 2 watts, probably more like 1 watt.

 

[RadioGuy772]

That's why they call me slim shady... I'm back, I'm back.... :oof::

 

[Crusher]

I have a 1x2 FB here I just repaired. Screw holes weren't countersunk. Input is padded pretty good. 2W DK into amp makes I'd DK 40W. Swings like hell. Up to 175w average. That was using a 250w element on the bird. I was using a 148gtl that only does 15W pep max. 5W DK is way too much. That's about what you could put into a 4pill and let it swing safely all day long. Just my 2 cents.

 

[Captain Kilowatt]

I understand what you are saying. You gotta know what your running and have at least a basic understanding of how it works

Sent from my SCH-I545 using Tapatalk

Ed Zachery.

 

[Shockwave]

The 2879 runs at 13 db and with a 4 watt carrier driving a pair, that's 80 watts carrier that would need to hit 320 watts PEP to modulate 100%. The resistive attenuation in the 1 pill driver stage so that 2 watts in equals 40 out has both the driver and final stage running at a combined gain of only 13 db. The same gain available from just the pair of 2879s without the unreliability over driving offers or the expense of the extra driver stage.

 

[The Jerk]

Yeah he was probably dking at 300 if his radio was dking at 5. That 2290 probably needs less then a 1 watt key.

Sent from my SCH-I545 using Tapatalk

The 1x2 Fatboy I had took less than 1/4 of a watt to get full output from the 2879s, and that was with my variable was turned all the way down. I think I was swinging less than 2 watts into it, and getting wild watts out of it.

5 watts would smoke it short order...