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Faulty K1 relay

 

For anybody trying to get their uBITX to work in Tx mode. Something to check perhaps.

Mine was working then started to become intermittent. Key the Mic PTT switch and the display shows it's in Tx mode, but no power out.

Tracing signals etc, I found that the K1 changeover relay was not switching 12V to the Tx section. I could hear the relay 'operate' but it didn't actually switch.

Replaced the relay and all is fine.

glenn
vk3pe
 

I had exactly the same issue with my BitX40. Perhaps the supplied relays
are poor quality. I replaced the relay by:

brand: ZETTLER
type: AZ822-2C-12DE



When replacing the relays it's also a good idea to install standard 16 pin
DIL IC sockets. The relays fit in, so you can easily swap them should
they fail again.

73 Allard PE1NWL

On Thu, February 22, 2018 11:21, Glenn wrote:
For anybody trying to get their uBITX to work in Tx mode. Something to
check perhaps.

Mine was working then started to become intermittent. Key the Mic PTT
switch and the display shows it's in Tx mode, but no power out.

Tracing signals etc, I found that the K1 changeover relay was not
switching 12V to the Tx section. I could hear the relay 'operate' but it
didn't actually switch.

Replaced the relay and all is fine.

glenn
vk3pe
 

Hi Allard,

The part i don't like is that these relays in the LPF section, they may not operate properly either and you wouldn't know, normally.

Glenn
C¨¦sar EA3IAV
 

Hi! Do you think this may work??
I see the different minimum take voltage...
I can't seem to find that DE 12DE refference but the 12DSE...

That link you put doesn't send to Spain
 

Not completely sure but I think it will work OK.
The only difference is that the coil resistance is slightly higher but I
believe this is not critical for use in BitX.
Why not just try it out?

73 Allard PE1NWL

On Fri, February 23, 2018 12:47, C??sar EA3IAV wrote:
Hi! Do you think this may
work???
I see the different minimum take voltage...
I can't seem to find that DE 12DE refference but the 12DSE...

That link you put doesn't send to Spain

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