[Kenwood] Using SM-220 with TS-940

[Alan Wolke]

Congrats on the scope Chris.  In order to use the pan-adaptor, you only need the
RCA cable from the wideband 8.83 IF from the rig to the module, with the
function switch in the BandScope mode.   Connecting from the narrow-band IF to
the vertical input is not necessary for the bandscope function, it is only
necessary to monitor the RX signal (in the OSC function).

I'm not sure what the bandscope graticule looks like either.  The standard
graticule is a simple grid pattern 8x10.  You can use this graticule with either
function.  The bandscope graticule probably has a pattern that has a main
sub-divided axis on the bottom (instead of the middle) to form a good baseline
for the spectrum display.

I've found that the output waveform monitoring is most effective with the Sweep
speed adjusted fairly slow, just fast enough to remove the visible flicker.
This is on the 10-100 position, and the Sweep Var set to about 2 o'clock.  This
will give you enough voice peaks on screen simultaneously to allow you to
evaluate your modulation.

The SM-220 is a basic 10MHz scope, and differs from the HP scopes that you are
likely using in your class.  The HP scopes (and most analog scopes) are
triggered sweep scope, where the trace is initiated by a triggering event.  The
SM-220 is a recurrent sweep scope, where you have to manually adjust the sweep
speed to "synchronize" on a waveform to get a "stable" display.  This is fine
though for the monitoring use as it is intended.

I love mine, I use it all the time with a TS-870S and TS-830S.

73,
Alan W2AEW

Chris \"Zap\" wrote:

> Greetings,
>
>     I just recently purchased a SM-220 monitor scope to use with my TS-940.
> However, I appear to be having a few problems getting everything running
> properly, and I also had a few questions about the scope's functionality.
>
>     My scope has the BS-8, so I should be able to use the Pan display.
> However, the only cables that came with the scope were a coax cable to
> connect between the rig and the scope (for TX monitoring) and a simple RCA
> cable for the IF output.  I currently have the RCA connected between the
> scope and IF out 1.  Do I also need the RCA from IF out 2 to connect to the
> Vertical input for the pan to work properly, or is that only for monitoring
> the incoming signal?  Additionally, the book with the scope informs me that
> the adapter kit for the BS-8 was supposed to come with another graticule for
> the display.  Needless to say, I only have one graticule, and that is the
> one installed on the scope.  How can I tell which one I do not have, and is
> it even possible to find the other one?  How do they differ?
>
>     As far as the waveform monitoring goes, is it possible to have the scope
> trace the TX waveform like the Icom 781 does, for instance?  (It has the
> peaking waveform centered in the display).  What I have been able to have my
> SM-220 doing is presenting me with a rolling waveform, as it is transmitted.
> What the problem I can see with this is, that before I can really see what
> is going on, the waveforms have scrolled off the screen!  Any advice on how
> to better use this excellent scope to my advantage are appreciated!  I'm
> currently using HP oscilloscopes in my electronics lab (I'm an EE student)
> so I am fairly familiar with the terminology.
>
> Thanks & 73,
> Chris, N9WIV
>
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>
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>
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--
Alan Wolke, W2AEW
"i usta cuDn't speL enjinere, noW i ar wuN"