Re: [Amps] Alpha Input SWR

[Alek Petkovic <vk6apk@bigpond.com>]

To quote Odetta Holmes (Hole in the bucket), "Well fix it dear Henry, 
dear Henry, dear Henry Well fix it dear Henry. Fix it."
73, Alek. VK6APK

On 10/01/2015 11:12 AM, Hardy Landskov wrote:
> My K3 has a real problem driving the 8410. Even with the matching 
> network it has a problem I can't seem to understand.
> The SWR on 12 m is over 3:1.
> Hardy N7RT
>
> ----- Original Message ----- From: "Peter Voelpel" <dj7ww@t-online.de>
> To: <amps@contesting.com>
> Sent: Friday, January 09, 2015 7:26 PM
> Subject: Re: [Amps] Alpha Input SWR
>
>
> > What is bad about SWR <2?
> >
> > 73
> > Peter
> >
> > -----Original Message-----
> > From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Hardy 
> > Landskov
> > Sent: Samstag, 10. Januar 2015 03:09
> > To: Charles Henry; ed@w0yk.com; amps@contesting.com
> > Subject: Re: [Amps] Alpha Input SWR
> >
> > Charly,
> > Changing the length of coax to the input will not change the SWR. 
> > Look at a
> > Smith Chart.  Only dealing with the tube's capacitance along with the 
> > 50 ohm
> > resistor to ground with a suitable matching network will lower the input
> > SWR. I wish Alpha and whoever is the designer of amps now would  
> > match the
> > input to every band but they don't. It's not that much more money to 
> > do it
> > right.
> > I am going to sell this 8410 because of that reason. What a piece of 
> > junk.
> > 73 HNY to all....  Hardy N7RT
> >
> > ----- Original Message ----- From: "Charles Henry" <k4vud@hotmail.com>
> > To: <ed@w0yk.com>; <amps@contesting.com>
> > Sent: Friday, January 09, 2015 3:15 PM
> > Subject: Re: [Amps] Alpha Input SWR
> >
> >
> > > All I have been able to do is to cut and try the length of the drive 
> > > coax
> > > from the radio RF output to the amplifier input.
> > > Sri forgot the lengths and never got 1:1 anyway.   Charly
> > >
> > > > From: ed@w0yk.com
> > > > To: amps@contesting.com
> > > > Date: Fri, 9 Jan 2015 08:44:18 -0800
> > > > Subject: [Amps] Alpha Input SWR
> > > >
> > > > What experience can anyone share for reducing the input SWR on Alpha
> > > > amps?
> > > > On some bands the input SWR is 1.6:1 or higher on our 86A, 87A and 91B
> > > > amps.
> > > >
> > > > Thanks,
> > > > Ed W0YK
> > > >
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--
From Sunny Binningup


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