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Re: [Amps] Alpha Input SWR

To: Colin Lamb <k7fm@teleport.com>, "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] Alpha Input SWR
From: Charles Henry <k4vud@hotmail.com>
Date: Sat, 10 Jan 2015 05:32:56 +0000
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Hardy,I do not have Mr. Smith's chart.   All I know is what I see with my own 
eyes. CHANGING THE LENGTH OF THE COAX changes the swr as measured by the 
driver, the radio.  What do you recommend to do when the Smiths of this world 
think they know something and then actual real-world practice shows 
conclusively difference?Charly
Over the years here is my rig list that was used with different coax lengths 
and traded off and other stuff obtained...Heath SB-220, FL 2100b, Alpha 
76-pac3, Alpha 87a, second 87a, Dentron DTR2000, Ten Tec Titan I, different 
76-pac3, three IC-2KL, and Alpha 9500.Drake TR3, TR7, TS-950sdx, FT1000MP, two 
FT-1000MP Mk5, FT-9000d, IC-7800, and K3... in the ssb era.





> Date: Fri, 9 Jan 2015 20:01:05 -0800
> From: k7fm@teleport.com
> To: amps@contesting.com
> Subject: Re: [Amps] Alpha Input SWR
> 
> If the swr is too high and you have excess drive, make up a 2 db 50 ohm pad.  
> My Alpha uses an untuned input with an impedance transformer and resistive 
> loading.  When the FCC amplifier rules changed, they suggested removing the 
> resistors.  That also increases the swr a bit.  A pad of the correct 
> impedance will improve the mismatch - if you have excess drive available.  
> 
> 73,  Colin  K7FM
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