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
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?
?Get BlueMail for Android ?
On 23 Jan 2025, 01:33, at 01:33, "James Tiberius via " <nono2212000=yahoo.com.au@groups.io> wrote:
>Thanks Tommy
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