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I have no power out, yet the oscillator is working as I hear it on my DX10 when the DX10 is not connected to an ant.? I ran hardware diagnostics on the rf filters.? They were pretty much a strange cousin of the examples in the instructions.? Not smooth at all.? Side tone sounds great!? In the diagnostics, a lower SWR was shown but no power out.? Any suggestions or further info needed?? The receiver sounds great, and the menu operation is very intuitive.? Excellent work.? Just looking for some ideas on what I can check, test points in the RF and PA sections.
Burt
K4SRQ.

Hey John, thanks for the reply:

All bands no power out.
Verified that no input exists to the antenna tuner.
12 Volts for power.

97 milliamps on receive.
60 meters - 141 Milliamps xmit
40 meters - 154 Milliamps xmit
30 Meters - 177 Milliamps xmit
20 Meters - 207 Milliamps xmit
80 Meter - XMIT Disabled -?

I did a jeweler's loop inspection and checked continuity for the Transformers.? Was wondering what the voltage readings should be at the pads for T501 and T507.? Also, do you know the expected Bias on Transmit for QW503-Q506?? Will check C526 specifically.??

Burt
K4SRQ

Burt,

That current draw in TX is quite low. Check continuity through L502.

In TX the four PA transistors will have an RF square wave signal at the gates . The magnitude of that signal is 5 volts and an oscilloscope will show that. As the duty cycle is 50% a multimeter will read 2.5 volts.

The primary side of T501 should have a DC potential in the range of 9-12 volts on each of 3 pins but during transmit the drain terminals will also have an RF signal riding on that voltage of approximately 45V p-p. At the secondary side? in TX you should see? 15-25 volts p-p RF voltage with no DC bias. These are all from memory and are approximate.?

Hope that helps and GL? 73 JZ KJ4A?

On Mon, Mar 4, 2024, 9:24?AM Burt Wizeman <burt@...> wrote:

Hey John, thanks for the reply:

All bands no power out.
Verified that no input exists to the antenna tuner.
12 Volts for power.

97 milliamps on receive.
60 meters - 141 Milliamps xmit
40 meters - 154 Milliamps xmit
30 Meters - 177 Milliamps xmit
20 Meters - 207 Milliamps xmit
80 Meter - XMIT Disabled -?

I did a jeweler's loop inspection and checked continuity for the Transformers.? Was wondering what the voltage readings should be at the pads for T501 and T507.? Also, do you know the expected Bias on Transmit for QW503-Q506?? Will check C526 specifically.??

Burt
K4SRQ

Burt, I'll check out you screen shots later. Thanks for posting them.

On Mon, Mar 4, 2024, 11:37?AM John Z via <jdzbrozek=[email protected]> wrote:

Burt,

That current draw in TX is quite low. Check continuity through L502.

In TX the four PA transistors will have an RF square wave signal at the gates . The magnitude of that signal is 5 volts and an oscilloscope will show that. As the duty cycle is 50% a multimeter will read 2.5 volts.

The primary side of T501 should have a DC potential in the range of 9-12 volts on each of 3 pins but during transmit the drain terminals will also have an RF signal riding on that voltage of approximately 45V p-p. At the secondary side? in TX you should see? 15-25 volts p-p RF voltage with no DC bias. These are all from memory and are approximate.?

Hope that helps and GL? 73 JZ KJ4A?

On Mon, Mar 4, 2024, 9:24?AM Burt Wizeman <burt@...> wrote:

Hey John, thanks for the reply:

All bands no power out.
Verified that no input exists to the antenna tuner.
12 Volts for power.

97 milliamps on receive.
60 meters - 141 Milliamps xmit
40 meters - 154 Milliamps xmit
30 Meters - 177 Milliamps xmit
20 Meters - 207 Milliamps xmit
80 Meter - XMIT Disabled -?

I did a jeweler's loop inspection and checked continuity for the Transformers.? Was wondering what the voltage readings should be at the pads for T501 and T507.? Also, do you know the expected Bias on Transmit for QW503-Q506?? Will check C526 specifically.??

Burt
K4SRQ

Burt, I'll check out you screen shots later. Thanks for posting them.

On Mon, Mar 4, 2024, 11:37?AM John Z via <jdzbrozek=[email protected]> wrote:

Burt,

That current draw in TX is quite low. Check continuity through L502.

In TX the four PA transistors will have an RF square wave signal at the gates . The magnitude of that signal is 5 volts and an oscilloscope will show that. As the duty cycle is 50% a multimeter will read 2.5 volts.

The primary side of T501 should have a DC potential in the range of 9-12 volts on each of 3 pins but during transmit the drain terminals will also have an RF signal riding on that voltage of approximately 45V p-p. At the secondary side? in TX you should see? 15-25 volts p-p RF voltage with no DC bias. These are all from memory and are approximate.?

Hope that helps and GL? 73 JZ KJ4A?

On Mon, Mar 4, 2024, 9:24?AM Burt Wizeman <burt@...> wrote:

Hey John, thanks for the reply:

All bands no power out.
Verified that no input exists to the antenna tuner.
12 Volts for power.

97 milliamps on receive.
60 meters - 141 Milliamps xmit
40 meters - 154 Milliamps xmit
30 Meters - 177 Milliamps xmit
20 Meters - 207 Milliamps xmit
80 Meter - XMIT Disabled -?

I did a jeweler's loop inspection and checked continuity for the Transformers.? Was wondering what the voltage readings should be at the pads for T501 and T507.? Also, do you know the expected Bias on Transmit for QW503-Q506?? Will check C526 specifically.??

Burt
K4SRQ