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Diskussions- und Newsboard des DARC-Ortsverbandes I40  |  allgemeine Kategorie  |  mcHF Projekt Deutsch / English (here you can discuss everything related to mcHF) (Moderators: DF8OE, DL1PQ)  |  Topic: Version 6.3 issue <- zurück vorwärts ->
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WD8BXS
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Version 6.3 issue
« 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
« Last Edit: 02. December 2019, 14:32:09 by WD8BXS » Report to moderator   Logged
DL8EBD
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Re:Version 6.3 issue
« Reply #1 on: 02. December 2019, 15:38:00 »

Chuk, maybe a fault in one of the CBT3253C?


« Last Edit: 02. December 2019, 16:22:59 by DL8EBD » Report to moderator   Logged

vy73
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Re:Version 6.3 issue
« Reply #2 on: 02. December 2019, 15:54:13 »

Very nice answer, I will change them out and see.
Thanks,
Chuck
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SP3OSJ
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Re:Version 6.3 issue
« Reply #3 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
« Last Edit: 02. December 2019, 16:03:36 by SP3OSJ » Report to moderator   Logged
DL8EBD
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Re:Version 6.3 issue
« Reply #4 on: 02. December 2019, 16:22:33 »

Artur is right, this is a big difference between CBT3253C and CBT3253 without "C"!
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vy73
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Re:Version 6.3 issue
« Reply #5 on: 02. December 2019, 22:34:25 »

Replaced both CBT3253C chips....No difference.

Chuck
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OE3HKC
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Re:Version 6.3 issue
« Reply #6 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
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Re:Version 6.3 issue
« Reply #7 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.
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73 Slawek
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