Just a reminder of a problem that first came up several HPSDR releases ago... and still remains in release 3.4.9. I am using an ANAN-10E, but I believe this problem exists on other models as well.
In "tune mode" (but not in other modes such as two tone, or normal transmit operation), with DUP on, and a known/fixed output power sample being provided as a Pure Signal input... the panadapter displays a carrier power reading that is about 10dB low on 40 meters. It is also incorrect, by various amounts, on other bands.
However, the output power is correct, and the S-ATT setting is correct.
Stu
Panadapter level reading when using "tune"
Re: Panadapter level reading when using "tune"
If it helps, the correct display is restored when changing ATT during TUNE.
This is not persistant, on the next tune the error comes up again.
Walter
This is not persistant, on the next tune the error comes up again.
Walter
Re: Panadapter level reading when using "tune"
Walter
Thanks... that works! While in "tune" mode... I changed the S-ATT setting from 19dB to 20dB... and the panadapter reading changed from about 10dB too low to the correct reading.
Yes... if I cycle tune off and back on... then the panadapter reading returns to about 10dB too low.
Interesting...
Stu
Thanks... that works! While in "tune" mode... I changed the S-ATT setting from 19dB to 20dB... and the panadapter reading changed from about 10dB too low to the correct reading.
Yes... if I cycle tune off and back on... then the panadapter reading returns to about 10dB too low.
Interesting...
Stu
Re: Panadapter level reading when using "tune"
Based on the behavior that I am observing... I suspect that the step attenuator's actual value (independent of the S-ATT setting shown on the GUI) is being set to 31dB when you first select tune mode. Then, when you change the S-ATT setting (while still in tune mode), the step attenuator 's actual value is set to whatever S-ATT is set to. While the step attenuator's actual value is set to 31dB (before you change the S-ATT setting), the part of the HPSDR application that controls the GUI display is "assuming" that the step attenuator is set to the S-ATT setting. That is why the panadaptor displays a carrier power value that is too low.
Example
S-ATT is set to 20dB... but the actual value of the step attenuator is 31dB. The HPSDR application thinks that the step attenuator's actual value is 20dB (i.e. what S-ATT is set to). Therefore, the panadaptor reading (calculated based on the assumed 20dB step attenuator value) is 11dB too low.
Stu
Example
S-ATT is set to 20dB... but the actual value of the step attenuator is 31dB. The HPSDR application thinks that the step attenuator's actual value is 20dB (i.e. what S-ATT is set to). Therefore, the panadaptor reading (calculated based on the assumed 20dB step attenuator value) is 11dB too low.
Stu