[Amps] PowerGenius XL Video

[Ken K6MR]

“run all day key down maximum smoke on FM and RTTY (people really do that?)”

Maybe not all day, but in a serious RTTY SO2R contest effort dual CQ mode will keep my amp(s) transmitting nearly 100% of the time for many hours. I switch the amp(s) between the radios real time, and the rule is “you are only loud when you are transmitting”. So one radio is nearly always transmitting.

I run a pair of KPA500s combined and they will run 100% full power for as long as I need.  And yes, into reasonably big antennas.

Ken K6MR

From: Kevin<mailto:kstover at ac0h.net>
Sent: Saturday, February 11, 2017 8:54 AM
To: amps at contesting.com<mailto:amps at contesting.com>
Subject: Re: [Amps] PowerGenius XL Video

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 at 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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>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>

--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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