[Elecraft] RS232 polling noise with MicroHAM CW Keyer

[Mark Schreiner]

I noticed this problem on 40m using N1MM logger.  I haven't used other 
programs with RS232-like interface to the K2 yet.  I removed the top 
cover to see if there was anything simple like moving the RS232-like 
cable that is internal from the front panel to the rear panel, but that 
made no difference.  I haven't done anything else to try to correct this 
yet.  I don't use logging programs very often, but it is somewhat 
annoying when tuning across a quiet band.  All signals I've worked have 
been well stronger than this noise, but it is just another annoying 
noise source to listen to (or try to filter out or ignore).  I did 
resolve some discreet noises by getting rid of my CRT monitor and 
upgrading to a nice LCD monitor.  Obviously that didn't help the RS232 
problem though.

Mark, NK8Q
K2 4786

Alan Ibbetson wrote:

> My newer laptop does not have a serial port and doesn't run DOS so I 
> got a MicroHAM CW Keyer. It works fine with my FT1000MP Mk5, but with 
> my K2/100 I get significant noise (like, S5 on the meter) on all bands 
> whenever the MicroHAM is polling the K2 RS232 for VFO/Mode data.
>
> Has anyone else seen this problem? MicroHAM support says it's a known 
> problem with the K2 (?) and suggested asking on this list whether 
> there are any known fixes.