Re: Bitx40 75KHz Spurious, How to solve it. #bitx40

Tim Gorman
 

It shows scanning from 7.029Mhz to 7.049Mhz. That's only a 20khz
scan, not 50khz. And certainly not 50khz per division on the screen.

The funny thing is that those unknowns are *increasing* in amplitude as
you move away from the carrier instead of decreasing. I'm not sure what
would generate this.

Could these be products from overdriving the spectrum analyzer?

tim ab0wr

On Tue, 26 Jun 2018 04:30:56 +0530
"Raj vu2zap" <@Raj> wrote:

Allard,

The pic attached is in 50Khz horizontal display.

Raj

At 26/06/2018, you wrote:
Hi Akira san,

But the spurious at 75KHz was observed.

I guess you mean 75 MHz (not kHz)?

The spurious might be the multiple of 25KHz.

In that case it could be a harmonic of 25 MHz (not kHz). Perhaps it
comes from the 25 MHz crystal in the Raduino?

73 Allard PE1NWL

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