SB-620 "Pip" disappears at screen centre

[Gary Schafer]

Hi Mark

Been a long time since I played with one. By disappearing do you mean it goes off screen?
If so you may need to reduce the gain. If the pip is not symmetrical it may be that the
sweep speed is too fast.

73
Gary  K4FMX


"Mark V. Johnson VE3DJU" wrote:

> Hi everyone;
>
> Just got an SB-620 (wired for 3395 IF) and connected it to my SB-301. Seems
> to work OK, but when a signal is tuned in, the Pip moves to centre and
> disappears. Is this normal operation?? Also, I'm having trouble getting a
> nice symmetrical "Pip". Adjusting T2 & T3 as per the manual shrinks the
> "Pip" but won't shape it?? Ideas or comments appreciated.. I have attached
> a note I found in the archive but wondered if there was anything further.
>
> Thanks again Folks!
>
> From:         Robert Schlegel <N7BH at AOL.COM>
>  Subject:      SB 620 PIP
>  Content-Type: text/plain; charset="US-ASCII"
>
>  For those who are using the SB620 with an SB100-101-102 and wish to see
> the
>  PIP at center frequency try this.  Move the tap point from V!2A, pin 6 to
> the
>  unused seconday winding of  T201. The capacitor is eliminated.   There may
>  still  be a slight reduction in PIP height , but the PIP will remain in
> view
>  as you tune across center frequency.
>
>  Bob  N7BH
>
> Mark V. Johnson
>
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