[Elecraft] K3 and SM-220

[Jim Wiley]

Open up he SM-220.  The band-scope option is in a small metal box toward 
the rear of the scope.   It will be marked either BS-8 or BS-5, for 8 
MHz or 5 MHz respectively.  It may be possible to retune the unit to the 
desired operating range, although it may be necessary to juggle some 
component sizes.  A schematic can be obtained on line I think.  Note: if 
it is a BS-5, the only difference between the units is the oscillator 
coil and a few components.  Replacing the appropriate parts with those 
for the alternate frequency range will make the switch.  Since these are 
"discrete" parts, the swap should be straightforward.  The 8 MHz version 
may have enough tuning range to shift over the K3 IF without changing 
parts.  As supplied, the BS-8 is set for use with an 8.83 MHz IF, if I 
remember correctly. The band-scope print is part of the main SM-220 
manual. .


- Jim, KL7CC


DM4iM wrote:
> Elecrafters,
> i like to interface a Kenwood SM220 Scope to a K3.
> There is a Pan Display Option installed, but there is no hint
> if it is the BS-5 (3.3Mhz IF) or BS-8 (8.83Mhz IF).
> How can i determine which Pan Display i have?
> I got this scope from a SK w/o any manuals.
> If it is the 8Mhz IF, can i retune it AND will it work with a K3 /
> KXV3A ?
>
>
>