[Heath] SB-620?

[G3OOU at aol.com]

Hi Ken
 
Thanks for your comments. I will post the data on my technical website when 
 completed but at the moment I am repackaging some power supplies into 
SB600  boxes and one of them is a real challenge.
 
I worked out a series of mods for both the SB610 and SB620 to significantly 
 improve their functionality.
 
73

Bob

Bob F Burns G3OOU
C  Eng, FIET, MSE
G-QRP 6907
Secretary of Crystal Palace Radio &  Electronics Club: www.g3oou.co.uk
Technical web site:  www.qsl.net/g3oou
@BobFBurns on Twitter: http://twitter.com/BobFBurns  

 
In a message dated 13/09/2013 17:57:49 GMT Standard Time,  
kgordon2006 at frontier.com writes:

On 13  Sep 2013 at 4:28, G3OOU at aol.com wrote:

> 
> Hi Chris
>  
> In my personal opinion the SB620 is one of the very few units that  
Heathkit did not get quite right. 
> All example photos that I see with  signals displayed show severe signs 
of slew rate distortion - too 
>  high a scan speed for the IFbandwidth.

Indeed! This is why I always use  as slow scan speed as I can manage when 
doing "visual" 
alignments of IF  strips.

> For displaying general band activity the '620 IF bandwidth  
> is too narrow.

Again, agreed.

> The solution is not  technically difficult but the internal component 
arrangement makes changes  
> difficult so I propose the re-engineer my SB620 to make it more  flexible 
and increase the vertical 
> dynamic range.

Wel, I, for  one, would be very interested in your solutions, Bob. Your 
work has always  
impressed me.

vy 73,

Ken  W7EKB

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