[Heathkit] HO-10

Sat, 23 Aug 2003 18:37:58 -0400

  I'd check the resistors and clean/replace the pot in the vertical
positioning divider.

Mark  WB8JKR

On Sat, 23 Aug 2003 22:10:45 +0000 [email protected] writes:
> 
> Didn't seen anything relative to this in the archives so thought I'd 
> try here.
> 
> Just got a very nice looking HO-10 scope.  Seems to do what it is 
> supposed to
> do.  And one thing additional -- like, when it is turned on, as it 
> warms up
> (five or six seconds) it starts to generate hash in any receiver 
> around. 
> Appears to be about a half S-unit.  As the beam is moved down, using 
> the Vert
> Pos control, the hash decreases.  Moving the beam to the top of the 
> CRT the
> hash gets stronger.  No other control affects the noise, including 
> the
> intensity or focus controls.  Out of curiosity I switched it to 
> different AC
> receptacles, with no change.  Could apply an external ground, and I 
> may do so.
>  Seems like the hash may be radiating into the ant pickup.  I have 
> not looked
> at the inside of this scope yet, but realize this could be routing, 
> or
> overlong leads?  
> 
> Anyone else found this condition in an HO-10?  If so, did you 
> resolve it, or
> not, and if you did, how?  I notice there is a very, very low ripple 
> on the
> trace as well, which suggests some filtering problems, but that, 
> too, may be
> normal, as these are not exactly high-line scopes!  
> 
> Any thoughts?
> 
> Thanks
> Ed
> 
> --
> Ed Brooks, W5HTW
> http://w5htw.home.att.net/index.html
> Active since June 1956 Extra since
> Jan 1970
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