[UK-CONTEST] Amplifier Advice ACOM 2000's

[Christopher Plummer]

David,
 
Sorry to be pedantic, but RTTY is 100% Duty cycle, its CW thats around 50%.
 
So always derate your linear for Data modes.
 
Dont forget to try a toe in the water of HF RTTY this weekend in the BARTG RTTY Contest, its sounds like bedlam, but its actually fairly gentlemanly (at times at least).
 
Chris G8APB
BARTG Awards Manager
 

> From: g3yyd at btinternet.com
> To: UK-Contest at contesting.com
> Date: Tue, 24 Jan 2012 22:03:31 +0000
> Subject: Re: [UK-CONTEST] Amplifier Advice ACOM 2000's
> 
> The Acom 2000 was designed to run 1500 watts continuous carrier output for
> hours on end. So it can be run on RTTY contesting with its circa 50% duty
> cycle with a huge reserve. 
> 
> Most amplifiers being so called under run the only bit you are under running
> is the transformer. Half power out will dissipate almost the same power in
> the PA devices as running full power. However if the transformer is
> deliberately fan cooled will make a huge difference to its power capability
> compared to still air.
> 
> 73 David
> 
> -----Original Message-----
> From: uk-contest-bounces at contesting.com
> [mailto:uk-contest-bounces at contesting.com] On Behalf Of Jim Balls
> Sent: 24 January 2012 20:24
> To: uk-contest at contesting.com
> Subject: Re: [UK-CONTEST] Amplifier Advice ACOM 2000's
> 
> Most of the video's on you tube I've seen of contest operations have the
> amps running flat out!!
> 
> If you got it, flaunt it ;0)
> 
> -----Original Message-----
> From: Bob Harrison
> Sent: Tuesday, January 24, 2012 7:15 PM
> To: uk-contest at contesting.com
> Subject: Re: [UK-CONTEST] Amplifier Advice ACOM 2000's
> 
> My Merc is governed to 155MPH...... of course I take it to the limit
> everyday
> 
> 73 Bob G4UJS
> 
> > -----Original Message-----
> > From: uk-contest-bounces at contesting.com [mailto:uk-contest- 
> > bounces at contesting.com] On Behalf Of David Honey
> > Sent: 24 January 2012 18:53
> > To: uk-contest at contesting.com
> > Subject: Re: [UK-CONTEST] Amplifier Advice ACOM 2000's
> >
> > On 2012-01-24 16:51, Ken Eastty wrote:
> > > 5. ACOM 2000, friends and contest groups use these (under-run of 
> > > course in the UK)
> > >
> > > Under-run? Pull the other one.
> > >
> > > Contest entries from UK stations using Linears capable of running 
> > > more than 1kW (or much less on 4m) should be disallowed.
> > > I notice that some operators are very reticent when it comes to 
> > > telling what amplifier they use.
> > >
> > An amplifier that is rated at 1kw is rarely rated for high duty 
> > cycles, and for contest use you want to be sure the amplifier can run 
> > for an extended period without overheating. Using a 1kw amplifier at 
> > 400w achieves that. I don't buy the argument that just because some 
> > one has the equipment to do something illegal automatically makes them 
> > guilty of using it in that manner.
> > It reminds me of the joke of an accused being charged with a crime and 
> > then asking the judge to also charge him with rape. After all, he had 
> > the equipment. :-) _______________________________________________
> > UK-Contest mailing list
> > UK-Contest at contesting.com
> > http://lists.contesting.com/mailman/listinfo/uk-contest
> 
> 
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