Pwr and SWR indicate 0w and 9.99

[M0MBO]

Hello,

My (tr)uSDX is newly built and everything is working correctly except for the pwr and swr readings on the top line of the display.

I have currently only populated the 40m LPF.
On CW mode it indicates pwr = 0 and swr = 9.99.
On LSB there is no pwr and swr data.
On an externally connected pwr/swr meter and dummy load it indicates 2.5w and swr of 1, as I'd expect.
I have checked the t1/t2 connections.

I have probably missed something obvious, but wanted to check in with the experts.

Cheers and 73
Malcolm
M0MBO

[mm0gyx]

Hello,

My (tr)uSDX is newly built and everything is working correctly except for the pwr and swr readings on the top line of the display.

I have currently only populated the 40m LPF.
On CW mode it indicates pwr = 0 and swr = 9.99.
On LSB there is no pwr and swr data.
On an externally connected pwr/swr meter and dummy load it indicates 2.5w and swr of 1, as I'd expect.
I have checked the t1/t2 connections.

I have probably missed something obvious, but wanted to check in with the experts.

Cheers and 73
Malcolm
M0MBO

Hi Malcolm,

You could use a meter to make sure your bridge is generating a voltage whilst you transmit. Looking at the schematic you can get to fwd and ref easily at R6-C7 for the former and R5-C8 for the latter. I just did it, I got about 30 mV for fwd and 1.7 volts for ref.

Also, maybe cycle through the menu settings for swr to what that does for you.

Ian MM0GYX

[DL2MAN]

On CW mode it indicates pwr = 0 and swr = 9.99.

That is the case, when the AtMega gets no Signals from SWR Bridge, so either check Transformers, check Inter PCB Connection for continuity and more unlikely: Check the rectifier Diodes.

On LSB there is no pwr and swr data.

That´s normal. SWR for SSB is not yet implemented in Software. Is more complicated than thought.... Guido is working on it.

I have checked the t1/t2 connections.

Re-.check again and again.... Copper Enamel Wire is a bi**h.... Also check your Relay Soldering and your 40m Coils....

73 Manuel; DL2MAN

[M0MBO]

Thanks Ian and Manuel - appreciate the ideas and will re-check as suggested.
Cheers,
Malcolm
M0MBO

[M0MBO]

Issue Solved...

Manuel's guess was correct; T1 secondary winding rewound, copper wires carefully cleaned and re-soldered.
The pwr & swr on the top line now perfectly match my external meter reading.

Thanks
Malc
M0MBO