[Elecraft] K3 and SM-220

[Jack Smith]

  VE7GZ tried using an SM220 with his K3 a couple years ago - some posts on the subject should be in the reflector archives.

Although it isn't hard to move the center frequency, the SM220 is not sensitive enough to provide a useful display with the K3 from what he said. Considerable external gain is required from his reports.

Jack K8ZOA




On 10/10/2010 6:10 PM, Radio Amateur N5GE wrote:
> On Sun, 10 Oct 2010 13:58:20 -0800, Jim Wiley<jwiley at alaska.net>
> wrote:
>
> Hello Jim.
>
> I have a Kenwood SM-230.  I wonder if the same holds true for that
> model?
>
> Tom Childers, N5GE
> Licensed since 1976
> QCWA Life Member 35102
>
> n5ge at n5ge.com
> http://www.n5ge.com
> http://www.swotrc.net
>
>> 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 ?
>>>
>>>
>>>
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