[Amps] Alpha Input SWR

[Robert Dorchuck]

Strange.  My 8410 has an input SWR of less than 1.5, 36 watts in for 
1500 out on 12 meters.  Transceiver is a TS-990.  Have you contacted Alpha?
Bob  W6VY

On 1/9/2015 7:12 PM, 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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