开云体育

Power zero on 10m / Drive number

Matt All Messages By This Member #116859 So, I'd been watching another thread for resolution, but it may not be the same thing. Questions up front. 1. Any reason why 10m is 0W?? 2. See my drive? it's 96, and I don't know why I can't get it to 100. When using the wheel, it won't go any higher, though it certainly goes lower.? These lead me to believe both are software configuration related.? ? The problem: I initially had the issue with FT8 locking up the zBitx. Updating the both the Zero and Pico software resolved that. I'm at 1.6 and 3.051 now. Running sBitx on the external monitor resulted in 0W out.? ? However, I'd still get 0 watts out when transmitting FT8 on 10m. ? However, I remembered I get less output on my sBitx at 10m, so I setup a 20m vertical and I got power out. I haven't had time to check 12/15/17m. Could there be a problem with the calibration files that I absolutely did not backup when I did the update? ? Any guidance would be appreciated! Matt
[email protected] All Messages By This Member #116862 Matt, I have logged the 10M power output bug on .? ? This seems to be a software bug. The current workaround is to switch to another band (say 20M) and transmit (do a quick "qrl?" on CW) before going back to 10M. Doing this brings back the power on 10M.?? ? I haven't seen the drive problem so far. Are you able to set it on 100 on the other bands? Have you tried to restart the radio and see if you are able to adjust this? Please log this bug on Github so that Farhan can look into it.? ? 73, Ragav
Jens/HB9JOI All Messages By This Member #116870 开云体育 ? What`s the reason that I get on all bands only 2...max.3 watts output ? ? 73 ? ? toggle quoted message Show quoted text From: Vu3vwr via groups.io Sent: Thursday, April 3, 2025 6:23 AM To: [email protected] Subject: Re: [BITX20] Power zero on 10m / Drive number ? Matt, I have logged the 10M power output bug on . ? This seems to be a software bug. The current workaround is to switch to another band (say 20M) and transmit (do a quick "qrl?" on CW) before going back to 10M. Doing this brings back the power on 10M.? ? I haven't seen the drive problem so far. Are you able to set it on 100 on the other bands? Have you tried to restart the radio and see if you are able to adjust this? Please log this bug on Github so that Farhan can look into it. ? 73, Ragav
[email protected] All Messages By This Member #116880 Jens, The power output is determined by the input voltage and the drive setting. Are you using batteries? If there is a sag in the voltage when your radio goes into transmit, the output power will go down. Although you can crank up the input voltage upto 12V it's not recommended as the heatsink on the radio can get quite hot given that the 5V linear regulator has to drop the input voltage. ? Can you please confirm if you've set the drive to 100?? ? 73, Ragav
Andrew Wade UK Member Profile All Messages By This Member #116881 Ok glad to hear. I thought I had maybe let the magic smoke out. I will swap antenna and try on other bands. Do we now wait for the next update and fixes. 73 de 2E0IIY toggle quoted message Show quoted text On Thu, 3 Apr 2025, 06:59 Jens/HB9JOI via , <hb9joi=[email protected]> wrote: ? What`s the reason that I get on all bands only 2...max.3 watts output ? ? 73 ? ? From: Vu3vwr via groups.io Sent: Thursday, April 3, 2025 6:23 AM To: [email protected] Subject: Re: [BITX20] Power zero on 10m / Drive number ? Matt, I have logged the 10M power output bug on . ? This seems to be a software bug. The current workaround is to switch to another band (say 20M) and transmit (do a quick "qrl?" on CW) before going back to 10M. Doing this brings back the power on 10M.? ? I haven't seen the drive problem so far. Are you able to set it on 100 on the other bands? Have you tried to restart the radio and see if you are able to adjust this? Please log this bug on Github so that Farhan can look into it. ? 73, Ragav
Gordon Gibby KX4Z All Messages By This Member #116883 I don't know about Ashhar's specific circuitry, but many of these "power" measurement systems actually measure VOLTAGE and presume 50 ohms and calculate the power using Ohms Law etc. ? If your actual impedance of your load is 25 ohms (not 50) then you will actually have FAR more output power than these kinds of systems will report.? ?They are only accurate into 50 ohms precisely, zero reactance. ? Again, I haven't looked at exactly how Ashhar does his system.? ?You can check this by comparing YOUR output power into a 50 ohm dummy load, and then with the same settings, into your antenna.? ? If there is a difference in reported power....your antenna isn't 50 ohms and the system is being "fooled." ? I hope this helps.? ?Accurate power measurement is quite an effort, which is why such equipment is often so terribly expensive!? Ashhar MIGHT have actually measured current, voltage and phase and computed, but few people do this.? ? ? Gordon KX4Z ?
Evan Hand All Messages By This Member #116884 Hi Gordon, ? The sBitx and zBitx series use a directional coupler to measure SWR and Power: ? ? From the code, after reading the value from the ATTiny85 vfwd: ? ? sprintf(buff,"%d", (vfwd * 40)/68); ? ? set_field("#fwdpower", buff); ? 40/68 is the scaling of the ADC and the 50-Ohm conversion of voltage to power. ? Your comment on accurate power readings is correct.? It will not report an accurate value in anything other than a 50-Ohm load. ? 73 Evan AC9TU
Matt All Messages By This Member #117051 Ragav,? I was able to resolve the power issue with \drive 100 on the sBitx running on the extra monitor. I tried switching bands & quick transmit and now I’m getting 3W on 10 meters. ?Thanks for the help! Matt
Jens/HB9JOI All Messages By This Member #117129 开云体育 ? Gordon , exactly this was the reason for to get only 2...3 watts output. Antenna not 50 ohms . ? 73 ! Jens / HB9JOI ? +++ ? toggle quoted message Show quoted text From: Gordon Gibby KX4Z via groups.io Sent: Thursday, April 3, 2025 1:54 PM To: [email protected] Subject: Re: [BITX20] Power zero on 10m / Drive number ? I don't know about Ashhar's specific circuitry, but many of these "power" measurement systems actually measure VOLTAGE and presume 50 ohms and calculate the power using Ohms Law etc. ? If your actual impedance of your load is 25 ohms (not 50) then you will actually have FAR more output power than these kinds of systems will report.?? They are only accurate into 50 ohms precisely, zero reactance. ? Again, I haven't looked at exactly how Ashhar does his system.?? You can check this by comparing YOUR output power into a 50 ohm dummy load, and then with the same settings, into your antenna.??? If there is a difference in reported power....your antenna isn't 50 ohms and the system is being "fooled." ? I hope this helps.?? Accurate power measurement is quite an effort, which is why such equipment is often so terribly expensive!? Ashhar MIGHT have actually measured current, voltage and phase and computed, but few people do this.?? ? Gordon KX4Z ?

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