8877 will do 2500 watts out CCS. Like in a Bext broadcast FM amplifier.
88-108 MHz.
73
Jim W7RY
-----Original Message-----
From: Kevin
Sent: Saturday, February 11, 2017 11:06 AM
To: amps@contesting.com
Subject: Re: [Amps] PowerGenius XL Video
Jim brings up a good point that didn't cross my work addled mind last night.
On 10m FM you aren't going to get 60+% efficiency. Add to that 1500W
continuous carrier on FM for lets say an hour? The Pi-L tank will be a
puddle in the bottom of the cabinet. What's an 8877 rated for in CCS
service (since ICAS is now verboten)?
On 2/11/2017 10:51 AM, Kevin wrote:
All day, key down, maximum smoke? I doubt it.
That seems to be the new standard around here. Any amplifier topology that
can't meet that ridiculous standard isn't worthy. Oh, don't forget the
20:1 matching range auto-tuner so you can run all day key down maximum
smoke on FM and RTTY (people really do that?) using crap antenna's, and it
better not cost more than the shelled out SB-220 I bought 40 years ago.
On 2/10/2017 6:11 PM, Fern Rivard wrote:
Hey Kevin: I disagree with your comment. I have two hf amps using the
8877 and they both operate very quietly without use of humongous blower.
One of them is the Viewstar PT-3000A and other one is the alpha 9500.
73 from Fern VE7GZ
-----Original Message-----
From: Kevin
Sent: Friday, February 10, 2017 4:52 PM
To: amps@contesting.com
Subject: Re: [Amps] PowerGenius XL Video
No way a pair or trio of 3-500Z's does 1500W FM/RTTY key down all day.
An 8877 won't do it either without having a very big, very loud blower.
On 2/10/2017 4:29 PM, Bill Turner wrote:
------------ ORIGINAL MESSAGE ------------(may be snipped)
On Fri, 10 Feb 2017 10:30:17 -0800, VE7RF wrote:
## If it ends up being $7-10K..and cant be used for FM or RTTY at
full power, I would pass on it myself.
REPLY:
Me too. When this amp was first announced I was pretty gung ho for
it, but now I'm not so sure. A single 8877 will do anything the SS
amps will do except instant-on, and if that's really important to you,
a pair or trio of 3-500Z's will fill the bill.
If you think about it, a pi or pi-L network in the plate circuit is a
wonderful thing. Not only does it's Q reduce harmonics it also matches
impedance and compensates for SWR (reactance) all at the same time,
something a SS amp by itself can not do.
Maybe I'll keep my 9500 after all.
73, Bill W6WRT
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R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441
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