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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>
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