[Heath] SB-620?

[Guy Giacopuzzi]

Having been one of the "hams at Heath", it's my opinion that the 620' 
worked best on the IF frequency it was initially designed 
for--3395kc--all the other IF wiring options were mere afterthoughts.  
If I remember right, the coil/cap combinations for 3395kc were of higher 
Q and better quality...so this might explain why so many of you have 
complaints as to the usefulness of the unit...and Bob, I would love to 
see these mod's of yours...
Guy, WA6OQQ


On 9/13/2013 11:15 AM, G3OOU at aol.com wrote:
> 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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