Re: Is my BitX output stable?
|
The actual volume out of he speaker (mainly noise) increases significantly (3-4X) while tuning across the range mentioned?.? I only have a 1Mhz USB scope but voltage waveform confirms voltage increase to the speaker.??The increase appears to start after
the 7.200 beep but increases until max range 7.300.? I did not perceive this volume change when running V1.01 but I must admit I have not tried any other versions.??
My v3?unit is mostly stock with only mods being the?100pf cap to the output low pass filter, and the double diode to protect Q13.? The main reason for upgrading was I was seeing the?freq jumping at the output. The upgrade did not change that so maybe
I should try a down grade of the?SW maybe to something in?between V1.01 and 1.27.1?? I want to keep this one mainly stock as I want to build another for experimenting but want?to get this one?right first.
Gene N2IJF
toggle quoted message
Show quoted text
On Fri, Nov 17, 2017 at 08:10 pm, Gene Nitschke wrote:
With V1.27.1 the volume significantly increases while tuning between 7.230 and 7.300.? This did not occur with V1.01 loaded.? Is this normal?
It is hard to believe that the volume increase could have anything to do with the software.
The software only controls the VFO frequency, not the volume of the audio amplifier nor anything in the RF receive signal path.
What do you mean exactly by 'volume'?
The volume of the audio amplifier? Or is the sensitivity increased making all received signals (as well as the background noise) sound louder?
73 Allard PE1NWL
|
