[Elecraft] K2: Filter and BFO Settings for RTTY

[Don Wilhelm]

  Jon,

Look to computer shops for fans from defunct computers - often you can 
get them for free.

Put a resistor in series to reduce the fan speed (and noise), and place 
the fan over the PA transistor area of the heat sink.  The fan should 
pull air away from the heat sink for the most effective cooling.

73,
Don W3FPR

On 10/2/2010 8:54 PM, Jon Perelstein wrote:
> Don,
>
> Thanks for the response and info.
>
> The wording in the Operating Manual made me think that the same values are used
> for RTTY as for SSB, my mistake.  I used Spectogram (surprisingly easy) and have
> everything working nicely now.
>
> On the digital transmission heat issue.  The rig is ok on 1-2 minute digital
> transmissions (e.g., 1-2 minutes of PSK at 30 watts).  It'll warm up a bit,
> although nothing uncomfortable, and the internal fan can handle it.  The problem
> is longer transmissions.  For example, I do a lot of file sending for EmComm
> simulations and those transmissions can run 5-10 minutes at a time.  The area
> above the power transistors gets very uncomfortable on a long transmission like
> that and people notice drift in my transmissions.
>
> For now I've got a desk fan pointed at the rig when doing longer transmissions
> and that's keeping the rig cool and stable.   I'll find myself a muffin fan or
> smaller desk fan at the next hamfest.
>
> Jon
> KB1QBZ
>
>
>
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