[RTTY] WHICH BEGS THE QUESTION

[Phil Sussman]

Don,

The 17m appears to be a resonance issue. I'd suspect an input device rather
than the computer itself (since once the input clears, the messages go out).

Suggestion: The keyboard is most suspect (it has the most components, eh?).
Ferrite on the keyboard cable -or- another keyboard. Also, inputs like
audio (mic) cable, etc.

Do you have a field strength meter (even a cheap one). If you can reduce the
sensitivity it makes a nice sniffer. I've used one to locate a bad shield
(poorly soldered) on a PL-259.

Good luck -- happy hunting.

Hope you find a solution. Please advise what you find.

73 de Phil - N8PS


---

Quoting Don Hill AA5AU <aa5au at bellsouth.net>:

> I have an RFI problem on 17 meters. I cannot operate more than 100  
> watts or my FSK stops shifting. So it's definitely RFI getting
> into something. I have tried a few things and the computer chassis  
> is grounded to my large copper plate where all my grounds go. The
> ground wire is less than 18" to the copper plate.
>
> The weird part about it is that when the carrier stops shifting, the  
> message in WriteLog stops. If I lower the power, the rest of
> the message goes out so I don't actually lose anything being  
> transmitted. I have changed my FSK interface, tried each of my five  
> COM
> ports and a few other things I can think of.
>
> It's almost like the RFI is getting right into the PC and stopping  
> the message from going out. I don't have this problem on my
> laptop. Just haven't figured it out yet. Doesn't seem to be a  
> grounding problem though.
>
> Don AA5AU
>
> -----Original Message-----
> From: rtty-bounces at contesting.com  
> [mailto:rtty-bounces at contesting.com] On Behalf Of Bill Turner
> Sent: Wednesday, April 04, 2012 4:26 PM
> To: rtty at contesting.com
> Subject: Re: [RTTY] WHICH BEGS THE QUESTION
>
> ORIGINAL MESSAGE:
>
> On 4/4/2012 2:19 PM, Bill wrote:
>> I've connected computer case to radio for years.
>> I can't honestly say I ever noticed more or less rfi.
>
> REPLY:
>
> Every situation is different.
>
> Here, without the ground wire between computer and radio, 160 meters  
> is useless above 400 watts. The keyboard locks up.
>
> 73, Bill W6WRT
>
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