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Re: [TenTec] Solid State Amps

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Solid State Amps
From: "Ron Castro" <ronc@sonic.net>
Reply-to: Ron Castro <ronc@sonic.net>,Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 16 Jul 2006 17:16:48 -0700
List-post: <mailto:tentec@contesting.com>
TheSG-500, PW-1 and Quadra were reviewed in QST.  The SGC has a 3rd Order 
IMD of -28 dB and 5th Order of -48.  The PW-1 is -36 and -41 respectively. 
The Quadra as -32 and -44.  None are anything to write home about.  Also, 
the SGC had spurious and harmonic (worst case) of -49 dB vs. -60 for the 
PW-1, -50 for the Quadra.

1 kW MOSFET amps should be able drop below $3K since prices are dropping for 
the components.  Typically, broadcast amps are made from pre-built 'pallets' 
of 300 or 600 Watts from 3rd party suppliers.  Even Harris doesn't make its 
own amp modules, but outsources the work.  A "no frills" amp without the 
auto tuner, which is only needed if your loads are not near 1:1, even with a 
nice switching power supply that competes in price with a tube type rig 
should be only a few years away.

Ron Castro
Chief Technical Officer
Results Radio, LLC

----- Original Message ----- 
From: "Rob Atkinson, K5UJ" <k5uj@hotmail.com>
To: <tentec@contesting.com>
Sent: Sunday, July 16, 2006 4:27 PM
Subject: [TenTec] Solid State Amps

> I'm not sure how many hams want a no-tune amp--tuning a tube plate to low 
> Z
> doesn't really bother me that much, in fact I prefer to do it myself, not
> trusting some logic circuit to tune and load for me.  however I know one 
> of
> the great things about the PW-1 is that it follows the icom exciters 
> making
> them 1 kw transceivers which I must admit is pretty nice.   Also, it's
> easier to remote the amp when it's no-tune.   But I think a lot of hams 
> make
> buying decisions based primarily on the purchase cost.   Since they aren't
> transmitting around the clock every day of the year, operating costs 
> aren't
> that much of a consideration.    If I transmitted all the time, a 90%
> efficient s.s. tx would be attractive to me.  So, in other words, I
> understand the broadcast industry moving to s.s. but their reasons mostly 
> do
> not apply to hams, at least for now.   If a s.s. 1.5 kw ham amp or even a 
> 1
> kw ham amp can hit the $3K mark, then things will change.
> re the SGC, I did not know about the IMD problem.  Ron, do you know how 
> the
> PW-1 does in that department?  it has a reputation for being a pretty 
> robust
> s.s. amp--i heard the 1 kw pep spec is conservative.
> 73
> rob / k5uj
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