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Re: [Amps] Alpha Input SWR

To: "Peter Voelpel" <dj7ww@t-online.de>, <amps@contesting.com>
Subject: Re: [Amps] Alpha Input SWR
From: "Hardy Landskov" <n7rt@cox.net>
Date: Fri, 9 Jan 2015 20:12:42 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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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