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allgemeine Kategorie => mcHF Projekt Deutsch / English (here you can discuss everything related to mcHF) => Message started by: WD8BXS on 02. December 2019, 14:31:41

Title: Version 6.3 issue
Post by: WD8BXS on 02. December 2019, 14:31:41

Just finishing a ver 6.3

I have very low output on 20 meters.
10 mhz will give full output, but you have to drive it harder than usual.
I have triple checked the LPF and bandpass filter, no success.

Does anyone have any ideas where to look next?

Thanks,
Chuck

Title: Re:Version 6.3 issue
Post by: DL8EBD on 02. December 2019, 15:38:00

Chuk, maybe a fault in one of the CBT3253C?

Title: Re:Version 6.3 issue
Post by: WD8BXS on 02. December 2019, 15:54:13

Very nice answer, I will change them out and see.
Thanks,
Chuck

Title: Re:Version 6.3 issue
Post by: SP3OSJ on 02. December 2019, 16:03:15

Hi

You used the wrong integrated circuits.
You have probably installed CBT3253 and you should use CBT3253C

Good luck!
Artur

Title: Re:Version 6.3 issue
Post by: DL8EBD on 02. December 2019, 16:22:33

Artur is right, this is a big difference between CBT3253C and CBT3253 without "C"!

Title: Re:Version 6.3 issue
Post by: WD8BXS on 02. December 2019, 22:34:25

Replaced both CBT3253C chips....No difference.

Chuck

Title: Re:Version 6.3 issue
Post by: OE3HKC on 03. December 2019, 07:00:43

how is sensitivity of receiver part on 20m?
if ok, perhaps menu tx settings (20m) are wrong..
73

Title: Re:Version 6.3 issue
Post by: SP9BSL on 03. December 2019, 09:42:25

Hi,
I would use oscilloscope, 14 MHz is not so high frequency. Just follow the path of the signal with oscilloscope probe using TUNE.