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Re: BITX40 - frequency spectrum - Raduino irradiation - intermodulation products - #bitx40help

Jeffrey Peters
 

Greetings!

Would the 100pF cap added to the LPF work on the BITX40 model.
I just wired up the BITX40 kit I received two weeks ago and there was an extra smt cap in the bag of parts.?
It was not listed in the assembly pages on-line.? I have not yet found how that was to be used or if it was needed for
some other mod or update.

.? 72, Jeff K9JP

On Fri, Dec 15, 2017 at 8:08 AM, <fgsom@...> wrote:

Hello everybody,

while checking the ouput-signal of my BITX40, I found some nastygram signals in the frequency spectrum.

Interestingly the emission is at the begining and at the end of 40 m Band nearly clean, respectively the distance to the wanted signal is > 40dBm? - but? abt. +/- 70 kHz around 7.100 kHz.
I replaced the DDS-Wire with RG-174 Coax but without results.

Do any of you have a solution ?

73, Frank





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