SB-650 question

[Stu Lyon]

Hi Mark,
I'm using a AADE DFD2 display with my sb-301,-401 and I found putting a Y on
the -301 output jacks worked well  for the LMO and BFO connections. However
I could not get the HET output to drive both the counter and -401. I tried
all kinds of schemes and finally added a pre-amp which solved the problem.
See:  http://aade.com/preamplifier.html

The preamp is mounted in the SB-301 with double-backed 3M mounting pads
approximately under the preselector tuning cap. The input side connects to
the same place as does the HET cabling to the rear panel jack and the output
side goes the SPARE jack near the antenna inputs. The SPARE drives the HET
input of the counter. I'm not sure if the extra cabling disturbs the
tuning -- I had retuned everything so many times trying to get it to work
that I lost track of the original settings.

I used RG62 for all external cabling and RG175 for the internal wiring. If
you use the preamp, I would recommend increasing the filter capacitor to 100
uf (at least).

Here is a shot of another AADE preamp that I use to isolate a SB-630 from
the crystal filters.
http://www.pacificnet.net/~plyon/images/SB301mod/301IFBuf.JPG
Its mounted beneath the LMO.

73, Stu W6CUX
Winnetka, CA
slyon at pacificnet.net


----- Original Message -----
From: "Mark Graalman WB8JKR" <wb8jkr at JUNO.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Thursday, June 20, 2002 2:56 AM
Subject: SB-650 question


>   Can anyone give me information on using the
> SB-650 display with the 301/401 setup?
>  If the SB301/401 is set up for transceive operation
> do you use a RCA "Y" connector on the BFO, LMO,
> and HFO lines? If so, am I correct in assuming that
> one would have to align the BFO output coil, and the
> HFO coils in the 301 with everything hooked up since
> I would think the additional lines to feed the signals
> to the 650 display would cause additional loading to
> the HFO, BFO, LMO outputs of the 301.
>
> Mark  WB8JKR
>

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