[Amps] PowerGenius XL Video

[Jim W7RY]

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 at 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 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
>>> _______________________________________________
>>> Amps mailing list
>>> 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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