[TenTec] Paragon II RS-232 noise

[Dr. Gerald N. Johnson]

How about checking the control board grounding, as well as the cable 
shield grounding?

73, Jerry, K0CQ

On 12/15/2010 11:48 AM, Tom Mandera wrote:
>>     1. Re: Paragon II RS-232 Port (KA6UUP)
>> From: KA6UUP<ka6uup at comcast.net>
>> Subject: Re: [TenTec] Paragon II RS-232 Port
>>
>> The noise is very noticeable. Not faint at all.
>> I haven't tried another computer, but, I control my Icom r-75 with
>> RS-232 and have notice no interference.
>> The cable is an INMAC cable a few years old and may not be well shielded.
>> I will try it with my laptop and if it still occurs I will get an RS-232
>> to USB cable and try that.
>> Tnx es 73, Chuck
>
> I have a Paragon II and I have the serial noise as well.  "Scratch scratch
> scratch" every time the computer does anything on the serial line.
>
> It's there on the speaker, it's there on my head phones.
>
> It's there with every serial cable I've tried, on the two or three
> different computers I've tried it with (including a laptop).
>
> It's loud enough that it's always annoying, and would make working anyone
> less than "armchair" copy rather difficult.
>
> I also tossed aside the RS-232 25-pin cable and went to a CI-V "phone
> plug" style cable with integral TTL level converter... and still have the
> noise.
>
> The only way to get rid of the noise is to stop trying.
>
> I would like to configure the logging software to poll the radio once
> every X minutes, or maybe once every time I make a new log entry, which
> would at least keep the scratch-scratch down to "once in a while" but I
> haven't met much success with that, either.
>
> My radio is in Tennessee right now for repair and service - I didn't think
> to ask them if they could fix the serial related scratch. ;)  It seemed
> like there wasn't much of anything to do.
>
> -Tom
> ke7vux
>