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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...<br>
Guy, WA6OQQ<br>
<br>
<br>
<div class="moz-cite-prefix">On 9/13/2013 11:15 AM, <a class="moz-txt-link-abbreviated" href="mailto:G3OOU@aol.com">G3OOU@aol.com</a>
wrote:<br>
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<div>Hi Ken</div>
<div> </div>
<div>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.</div>
<div> </div>
<div>I worked out a series of mods for both the SB610 and SB620
to significantly improve their functionality.</div>
<div> </div>
<div><font family="SANSSERIF" ptsize="10" size="2" face="Arial"
lang="0">73<br>
</font><font family="SANSSERIF" ptsize="14" size="4"
color="#0000ff" face="Arial" lang="0"><i><br>
Bob</i></font><font family="SANSSERIF" ptsize="10"
size="2" color="#000000" face="Arial" lang="0"><br>
Bob F Burns G3OOU<br>
C Eng, FIET, MSE<br>
G-QRP 6907<br>
Secretary of Crystal Palace Radio & Electronics Club:
<a class="moz-txt-link-abbreviated" href="http://www.g3oou.co.uk">www.g3oou.co.uk</a><br>
Technical web site: <a class="moz-txt-link-abbreviated" href="http://www.qsl.net/g3oou">www.qsl.net/g3oou</a><br>
@BobFBurns on Twitter: <a class="moz-txt-link-freetext" href="http://twitter.com/BobFBurns">http://twitter.com/BobFBurns</a>
<div> </div>
<div>
<div>In a message dated 13/09/2013 17:57:49 GMT Standard
Time, <a class="moz-txt-link-abbreviated" href="mailto:kgordon2006@frontier.com">kgordon2006@frontier.com</a> writes:</div>
<blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px;
BORDER-LEFT: blue 2px solid"><font
style="BACKGROUND-COLOR: transparent" size="2"
color="#000000" face="Arial">On 13 Sep 2013 at 4:28,
<a class="moz-txt-link-abbreviated" href="mailto:G3OOU@aol.com">G3OOU@aol.com</a> wrote:<br>
<br>
> <br>
> Hi Chris<br>
> <br>
> In my personal opinion the SB620 is one of the
very few units that Heathkit did not get quite right.
<br>
> All example photos that I see with signals
displayed show severe signs of slew rate distortion -
too <br>
> high a scan speed for the IFbandwidth.<br>
<br>
Indeed! This is why I always use as slow scan speed as
I can manage when doing "visual" <br>
alignments of IF strips.<br>
<br>
> For displaying general band activity the '620 IF
bandwidth <br>
> is too narrow.<br>
<br>
Again, agreed.<br>
<br>
> The solution is not technically difficult but the
internal component arrangement makes changes <br>
> difficult so I propose the re-engineer my SB620
to make it more flexible and increase the vertical <br>
> dynamic range.<br>
<br>
Wel, I, for one, would be very interested in your
solutions, Bob. Your work has always <br>
impressed me.<br>
<br>
vy 73,<br>
<br>
Ken W7EKB<br>
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