Re: CW keying by PC serial port problem.
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Seems there are quite a lot of VUs using BITX! Even today evening I worked one of them on 40m SSB. Enjoying the discussion and learning a lot about BITX architecture in the process. Maybe someday?I will be able to assemble one.
73
Jon, VU2JO
On Sun, Nov 17, 2024 at 1:26?PM Sudipta Ghose VU2UT via <oneghose= [email protected]> wrote: VU2ZAP has given a nice reply. Similar problems cropped up in case of a friend's FT8 interface. 0.01ufd and 0.001ufd MLCC capacitors cleared the mess.
73 de VU2UT
On Sun, Nov 17, 2024 at 12:34?PM Raj vu2zap via <rajendrakumargg= [email protected]> wrote:
Its picking up RF and locking.
Try adding 0.1 or 0.01 uf across the DB9 wires and also the 914s
and see
Raj
On 17/11/2024 11:42 AM, VU3KFK via
wrote:
Hi all,
?
In my uBitx v6, I am trying to do CW keying from a PC through
serial port. For this I used DTR line from PC and used
optocoupler to couple the CW port in radio like below:
?
?
Problem is it works for first few word sent, then TX latches
up to ON continuously. I disconnected the input line from PC,
then also TX remain in ON. Then I connected the O/P line only to
radio and kept the I/P line disconnected, power cycle the radio
and set the CW mode to enable from radio. After 30 sec or so,
the TX again comes to ON automatically. This indicates problem
is in the O/P circuit that connects to radio. There is noise
somewhere that puts the photo-transistor in conduction mode
automatically without any input. But how this is happening ?
?
Thanks
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One of those ... ...
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