Use of SB-610 and SB-620

[Stewart D. Lyon]

Hi Ed,
Although I have both units, I have only the -620 connected to the receiver
(A SB-301) so my comments are only from the manual. The difference between
the two connections is that the -610 connects at the far end of the IF strip
whereas the -620 connects at the output of the 2nd mixer, at the input side
of the crystal filter and IF amp.

One problem with the SB-620 / SB-301 combination is "suck-out" of the
crystal filter at the center frequency. As you tune toward a signal, its
display height decreases to near zero as the signal approaches the passband
of the filter. A way to lessen this effect is to install a transformer in
the plate circuit of the mixer. I used a "T201" transformer from a junk
SB-100 with has a low-Z link as a secondary. The co-ax from the SB-620
connects directly to this link with no capacitor. I'm away from my
documentation but if you are interested, I can respond with more details.

Hope this helps,
73, Stu W6CUX

----- Original Message -----
From: "Ed Goss" <meg at APLCOMM.JHUAPL.EDU>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Thursday, April 05, 2001 12:40 PM
Subject: Use of SB-610 and SB-620


> Hello,
>      Anyone using the 610 monitor scope and the 620 scanalyzer
> together?  Do both hook to the same receiver IF point?  Do you just
> connect a "Y" connector to the receiver back panel and run to both
> units?  I am using a 610 monitor scope now; hooks to the IF via a
> small (6 or 8 pf) cap.  Does adding the 620 scanalyzer further load
> down the IF, and do I have to change the coupling cap to feed both
> units simultaneously?  Thanks.
> --Ed--

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