[ICOM] civ Noise on polling rig

[Jim Hargrave]

Marios,

Have you tried using a faster poll rate?

I don't know what program you are using, but some programs do not respond
well with the CI-V Transceive turned on. I think it is a timing problem
processing the response data.

I have never heard any noise with my IC-735, however if I turn the volume up
real high, I can hear the CAT on my FT-920. It is much lower than the normal
audio, so it is not a problem.

I doubt if adding Opto-isolators will help, since it appears from your
description, it is the radio response to the poll that is causing the noise.
With Transceive off, there would not be any response going out of the radio
when you turn the dial. with Transceive on, there would be data being
transmitted by the radio each time you turn the dial.

   * 73's Jim W5IFP *


   >-----Original Message-----
   >From: icom-bounces at mailman.qth.net
   >[mailto:icom-bounces at mailman.qth.net]On Behalf Of Marios Nicolaou
   >Sent: Monday, July 13, 2009 8:58 AM
   >To: icom at mailman.qth.net
   >Subject: [ICOM] civ Noise on polling rig
   >
   >
   >Dear All
   >I used a 756 pro III for the first time during the contest
   >yesterday and I
   >noticed that when the radio is being polled by a homemade CIV interface
   >(FTDI 232 based)  there is a very short burst of noise in the
   >receiver.  If
   >I turn the CIV transceive option ON in the software there is no
   >noise  when
   >the frequency doesnt change but when I turn the VFO this
   >associated with a
   >burst of noise until I stop turning.
   >
   >Is this "normal" or could this be a weakness of my interface?
   >Would adding
   >optoisolators after the ttl conversion (eg max232) take this noise away?
   >
   >--
   >Marios
   >5B4WN
   >----
   >Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
   >Icom Users Net: Sundays, 1700Z, 14.316 MHz
   >Icom FAQ: http://www.qsl.net/icom/
   >To support QSL/QTH.net: http://www.qsl.net/donate.html