If I connect a broadband power meter to the output of my radio I measure the following:
| State |
Power [dBm] |
Calculated RMS Voltage [V] |
Measurement configuration |
| PTT not pressed |
-47 |
9.99E-04 |
No attenuation |
| PTT pressed, no sound |
4 |
0.35 |
Added 40 dB of attenuation |
| PTT pressed, speaking |
40 |
22.4 |
Added 60 dB of attenuation |
So I get roughly similar numbers.
If I connect an oscilloscope across a 50 Ohm load connected to the antenna output I see the following waveform when I start PTT with no mic connected, SSB mode at 14.1 MHz. I don't see a signal that exponentially decays in 5 ms.
If I press the PTT while whistling loudly, the waveform looks like this (note the change in vertical scale from 5 to 20V per division):
On Friday, April 4th, 2025 at 4:12 PM, D Solt via groups.io <davesolt@...> wrote:
I am getting about 50mv noise out of the 20W amp in SSB with PTT engaged; no mic plugged in.? I'm running version 66.9 and am all calibrated.? Additionally, when PTT is engaged there is a burst of signal (about500mv) that exponentially decays in 5ms.? The audio sounds pretty rough on my other radio, but wonder if that is because of such close proximity.? Amplitude is affected by MIC GAIN.? Any thoughts?
dave, n3ds
