[Amps] RF-KIT SS AMP

[donroden at hiwaay.net]

I thought Midwesterners said " Never poke a pig".
Don W4DNR


Quoting Herbert Schoenbohm <herbert.schoenbohm at gmail.com>:

> As the old times in the Midwest used to say...."Never buy a pig in a poke"☺
>
>
> Herb, KV4FZ
>
>
> On 6/2/2017 1:01 PM, Jim Thomson wrote:
>> Date: Thu, 1 Jun 2017 18:48:55 +0000
>> From: Bill Turner <dezrat at outlook.com>
>> To: Amps group <amps at contesting.com>
>> Subject: Re: [Amps] RF-KIT SS AMP
>>
>> <It looks pretty good on paper but the real world sometimes has
>> <unpleasant surprises in store. I wouldn't buy one until it gets
>> <reviewed by an independent third party such as QST. It's real easy to
>> <lay out $3k and before long wish you hadn't.
>>
>> <A word to the wise.
>>
>> <73, Bill W6WRT
>>
>>
>> ##  agreed,  qst..or at least a handful of experienced  tech savvy  
>> types,  who can
>> make meaningful  measurements..including imd, etc,  and offer a critque.
>>
>> ##  I also noticed they reduce power output by reducing the current  
>> limit on the power
>> supply.... vs  reducing drive.  This method, I have not heard of  
>> before.   One would think it
>> would flat top 1st..once it hit the current limit threshold ?   But  
>> I have zero experience with it.
>>
>> ##  I have zero experience  with SS amps.  My concern is the TX   
>> IMD products.  Reducing
>> drive and PO is one method that would work..but eff  goes to  
>> hell..fast.  Diss then increases  with just
>> the typ 35% when po reduced.... while maintaining 48-50 vdc.
>>
>> ##  another method  to reduce IMD  may be to just increase the idle  
>> current  a bunch.
>> I have no experience with that either..except on tube amps.   But I  
>> suspect the eff might creep  up
>> a little, and perhaps slightly reduced  IMD.  Then again, the  
>> increased idle current would result in
>> a higher average dissipation.
>>
>> ##  A combo of reduced drive, and higher idle current might be the  
>> ticket,  but Im just speculating.
>> The faster 120mm fans could be used to handle the increased  idle  
>> current.  Its not like the SS amp
>> has to reside on the desk, it could sit anywhere...like in  my shop  
>> next door. Noise problem solved.
>>
>> Jim   VE7RF
>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps