[Heath] SB-620?

[G3OOU at aol.com]

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  IF bandwidth. For displaying general band activity the '620 IF  
bandwidth is too narrow.
 
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.
 
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 00:02:36 GMT Standard Time,  
ckepus at comcast.net writes:

Pete,

Thanks for bursting my bubble of ignorant enthusiasm  for getting my 620 up
and running with * (* = anything it could possibly be  hooked up to).
<chagrined grin>

Not ever seeing one of these  in action, I presumed there would be more
excitement and useful purpose  generated than "generally worthless".  Having
read your posts over the  years, it is unlikely you are inaccurate.  

Is there any point to  putting the time/money in one of these other than the
value of eye candy?  (Pete or anyone, please)

73,
Chris
W7JPG


-----Original  Message-----
From: Heath [mailto:heath-bounces at puck.nether.net] On Behalf  Of
pmarkavage at juno.com
Sent: Thursday, September 12, 2013 10:09  AM
To: wrcromwell at gmail.com
Cc: heath at puck.nether.net
Subject: Re:  [Heath] SB-620?

I connected my 3395 KHz IF SB-620 to my R-599D years  ago. The signal coming
out at the tap point was to low to really see any  trace action.
Had to build a voltage amplifier (several transistors) on to  a small perf
board and mounted it in the 599D. Nice eye candy, but  generally worthless
for HF activity.

Pete,  wa2cwa
http://www.manualman.com

On Wed, 11 Sep 2013 21:44:21 -0400  Bill Cromwell <wrcromwell at gmail.com>
writes:
> On 09/11/2013  06:52 PM, George Babits wrote:
> > Thanks to all who responded.   I now have a manual that will help
> me
> > get things figured  out.
> >
> > 73,
> > George
> >  W7HDL
> I have one of those here that I should connect to my Kenwood  Twins 
> (the receiver of course). Mine just happens to be on the  "Heathkit" 
> 3395 IF and so are the Twins. Whaddaya know!
>  
> 73,
> 
> Bill   KU8H

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