[UK-CONTEST] Key Clicks.

[Bob Henderson]

Sorry Mark but that's not right.

Clicks are a function of R/T and T/R transitions.  Tone is to do with
carrier modulation steady state.

Bob, 5B4AGN

2009/11/25 Mark Marsden <mm at plextek.co.uk>

> Hi Alex
>
> It all depends on the receiver bandwidth. If a CW signal is 20kHz wide
> and received at its "centre" frequency with a receiver bandwidth of
> 500Hz, the demodulated signal will have a rise time of 1/500 sec or 2ms.
> Then the clicks will not be observed, hence T9.
>
> The clicks become apparent as the receiver is tuned off frequency and if
> the receiver bandwidth is increased.
>
> 73 Mark G4AXX
>
> -----Original Message-----
> From: uk-contest-bounces at contesting.com
> [mailto:uk-contest-bounces at contesting.com] On Behalf Of Alex GM3ZBE
> Sent: 25 November 2009 17:20
> To: uk-contest at contesting.com
> Subject: Re: [UK-CONTEST] Key Clicks.
>
> Is a signal with clicks a "T9" signal?
> Alex
>
> Roger G3SXW wrote:
> > Surely it's 599K (or 599C).
> > 73 de Roger/G3SXW.
> >
> >
> > ----- Original Message ----- From: "Alex GM3ZBE"
> <alex at gm3zbe.plus.com>
> > Cc: <uk-contest at contesting.com>
> > Sent: Wednesday, November 25, 2009 2:42 PM
> > Subject: Re: [UK-CONTEST] Key Clicks.
> >
> >
> >> Hi
> >> I'm inclined to agree with you about the reasons for the response
> Jim.
> >>
> >> So K = Clicks?  If I receive 59K that means I am R5, S9 and have key
> >> clicks?
> >>
> >> Actually I think Yaesu have some responsibility.  For an  extended
> >> period, they carried on producing FT1000 series models with known key
> >> click problems and never seemed to do much about the design flaw.
> >> Alex
>
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