[Amps] Alpha Input SWR

[Hardy Landskov]

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 at hotmail.com>
To: <ed at w0yk.com>; <amps at 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 at w0yk.com
>> To: amps at 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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