Hi Tommy again,
Also looking at the block diagram, I can see the TX and RX share the LPF, which actually turns out to be Band Pass filters!! Fairly wide.
How does the RF get to the filter board is it a track mini co-ax, as you need to break in and see if you can measure the power before the filter, or I/p to relay?
I know this is all on one board, do isolating is tricky, to remove this board, you have to desolder the pre amp board, if you do not have a proper de soldering station, then stop.
You need to find out where the RF is going or being blocked.
73
Andrew
If you were closer I would repair free of charge!
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On 23 Jan 2025, 15:32, at 15:32, Andrew Lenton <a@...> wrote:
Hi Tommy,
Can you turn the power down on FM or CW to a few watts?
This will help with signal tracing
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On 23 Jan 2025, 15:13, at 15:13, "Tommy Wooten via groups.io"
<kf4rwg@...> wrote:
Andrew
Yes the current supply varies with usb modulation. That is why I put
the
mode to FM for the supply current test. The odd thing to me is that
the
supply current is substantially higher with the higher bands. I do
see
a
smaller but discernible ssb modulation in current at 160M.
The FM transmit at 10M a quick rise in heat on the PCB near L303. I
do
see
a high level of RF at the output of each of the PA transistors and the
level is substantially lower at the L305 output and down stream
through
the
LPF to the ANT1. As a result the output power at ANT1 is only
milliwatts
on the external power meter and dummy load.
I hope this description help's.
Thank you
Tommy
On Thu, Jan 23, 2025 at 9:18?AM Andrew Lenton via groups.io <a=
[email protected]> wrote:
Hi,
You need to find out if there is RF power being generated. The
current is
a clue, so switch to USB key up you should draw a few amps bias
current,
the speak CQCQ ect, the current should peak in sympathy with you
voice. If
it remains high you have a fault in the PS.
If the current remains the same check mic gain if ok, then you have
no
drive.
KR
Andrew
Get back to me
Do you have a spectrum analyser?
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On 23 Jan 2025, 01:33, at 01:33, "James Tiberius via groups.io"
<nono2212000@...> wrote:
Thanks Tommy
Andrew Lenton