[Amps] Alpha Input SWR

[Paul Baldock]

Buy a small LDG automatic antenna tuner such as the Z-100 to go 
between the rig and the amp.

- Paul

At 07:12 PM 1/9/2015, 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 at t-online.de>
>To: <amps at 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 at contesting.com] On Behalf Of Hardy Landskov
>>Sent: Samstag, 10. Januar 2015 03:09
>>To: Charles Henry; ed at w0yk.com; amps at 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 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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>>>
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>>
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>
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