Re: [wsjt-devel] Does the FT8 signal spike at the beginning of each transmission?

[James S. <kd...@gm...>]

This almost sounds partially like ALC Overshoot that is more of a problem with some radios than with others (it was really nasty on a TS590 that a friend had sent to me to test out). The pure 8-tone FSK signal does seem to make this more obvious on some of my radios than others.  Some of my radios have a delay function that will curb this a bit.  Not sure about the FTDX5000 or about how easily those functions would be accessed remotely but it may be worth a look. 

Jim S. 
N2ADV

> On Apr 12, 2019, at 12:38 PM, Frank Kirschner <fra...@gm...> wrote:
> 
> Some rigs, even high-end rigs including the FTdx5000, exhibit a spike on initial transmit. I noticed it mostly with the amp. The power would surge briefly, and then return to the dial value.
> 
> I suspect the combination of the surge and a bit of RFI is causing the problem. I suggest an opto-isolator on both ends of your CAT cable. They are available for RS-232 and USB. That, plus some ferrites along the run should help with the problem. Also, if you're using a desktop, try running several ground straps to the case of the computer. Consumer-grade computers aren't very resistant to RFI, and there is no bonding between the pieces of sheet metal.
> 
> 73,
> Frank
> KF6E
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