Connecting SB-610 to SB-101 for recv

Charles W. Morehouse w4gbw at BELLSOUTH.NET
Thu Aug 7 09:15:59 EDT 2008


Hi Folks,
I have restored a complete SB 101 station with the 610, 20, 30 and 50. 
   It is waiting for an operating console to put it on.  When you 
connect the 610 to the IF it
is a problem and at least  you must retune T-103.  Think I have an 
article  where you  install an op amp to the 1pf cap to provide gain and 
isolation.  Plan to do it to mine. 
If it locatable, will scan and email to you.
Luck and 73.
Wayne,
W4GBW

John P. wrote:

>Hi All,
> 
>   First, thanks to those taking interest and replying.
> 
>   For one person's query, the SB-610 is a scope that can monitor BOTH send and receive (IF = 3395kHz) signals.
> 
>   My philosophy on mods is to test EACH change that is incrementally added.  
> 
>   Thus, I first connected a 1pf cap to the tube's plate.  The SB-610 manual says either the grid or plate of the final IF amp.  From this point I ran a very very very short length of RG58 to one of the spare RCA jacks.
>   Note that at this point I could only locate a disc (not mica) cap at a local parts store (not radio shack either).
>   I did NOT connect the SB-610 yet as I have not installed the 3395 can and coil in it yet.
> 
>  The SB-610 manual says that a somewhat larger value cap may be needed for adequate vertical deflection.  But at this point I only wanted to get started and test as I go along.
> 
>  This simple connection DID adverselly affect the sensitivity.
> 
>  It is possible that I may need to "tweak" the tuning of the IF transformer.  Another option that was mentioned was a Hi-Z amp and I think that the SB-610 vertical amp may provide this.
> 
> Until I install the coil and can (3395) in the SB-610, I wish to be sure that the "connection" to the RCA jack on the SB-101 does NOT affect the receiver adversely.
> 
>  I will though entertain and appreciate any additional info.
> 
>Thanks & 73's
> 
>
>
> 
>  
>

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