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sBITX V2 serial # 001 Current Status and question

#sbitx_v2

Neil Goldstein All Messages By This Member #103013 Hi all,? After resolving my update woes (thanks Art N2AJO !!) I feel things are pretty stable. I know that the rig should be capable of upwards of 40 Watts on the lower bands. I'm not seeing that at 100% drive. Here is what I'm seeing, which I'm happy with, but would like to know if I need to tweak anything or look for a problem: (Into a fairly resonant antenna on most bands but tuned to close to 1:1) BAND? ? ? ? ? WATTS 80? ? ? ? ? ? ? ? ?15 40? ? ? ? ? ? ? ? ?18 30? ? ? ? ? ? ? ? ?20 20? ? ? ? ? ? ? ? ?21 17? ? ? ? ? ? ? ? ?12 15? ? ? ? ? ? ? ? ?12 12? ? ? ? ? ? ? ? ?10 10? ? ? ? ? ? ? ? ?11 I would say accuracy is + or - 2 Watts with this setup. Sorry, I have misplaced my dummy load. Anyway, is there anything I should be doing or looking at.? Otherwise, I'm enjoying the rig. --Neil, W2NDG
Neil Goldstein All Messages By This Member #103081 Sorry to reply to my own post, but I was hoping someone could advise me. Is there something I should be doing (see below) or should I be happy with these numbers? Thanks! --Neil, W2NDG Hi all,? After resolving my update woes (thanks Art N2AJO !!) I feel things are pretty stable. I know that the rig should be capable of upwards of 40 Watts on the lower bands. I'm not seeing that at 100% drive. Here is what I'm seeing, which I'm happy with, but would like to know if I need to tweak anything or look for a problem: (Into a fairly resonant antenna on most bands but tuned to close to 1:1) BAND? ? ? ? ? WATTS 80? ? ? ? ? ? ? ? ?15 40? ? ? ? ? ? ? ? ?18 30? ? ? ? ? ? ? ? ?20 20? ? ? ? ? ? ? ? ?21 17? ? ? ? ? ? ? ? ?12 15? ? ? ? ? ? ? ? ?12 12? ? ? ? ? ? ? ? ?10 10? ? ? ? ? ? ? ? ?11 I would say accuracy is + or - 2 Watts with this setup. Sorry, I have misplaced my dummy load. Anyway, is there anything I should be doing or looking at.? Otherwise, I'm enjoying the rig.
Dave AB7E All Messages By This Member #103083 开云体育 I would strongly urge that you do your tests into a good dummy load with known good connectors ... ideally with no cable ... before you do anything significant inside the rig.? And make sure you verify the power out with a decent external power meter instead of just relying on the internal readout. When troubleshooting you want to simplify as much as possible at each step. 73, Dave?? AB7E On 6/18/2023 5:30 PM, Neil Goldstein wrote: toggle quoted message Show quoted text Sorry to reply to my own post, but I was hoping someone could advise me. Is there something I should be doing (see below) or should I be happy with these numbers? Thanks! --Neil, W2NDG Hi all,? After resolving my update woes (thanks Art N2AJO !!) I feel things are pretty stable. I know that the rig should be capable of upwards of 40 Watts on the lower bands. I'm not seeing that at 100% drive. Here is what I'm seeing, which I'm happy with, but would like to know if I need to tweak anything or look for a problem: (Into a fairly resonant antenna on most bands but tuned to close to 1:1) BAND? ? ? ? ? WATTS 80? ? ? ? ? ? ? ? ?15 40? ? ? ? ? ? ? ? ?18 30? ? ? ? ? ? ? ? ?20 20? ? ? ? ? ? ? ? ?21 17? ? ? ? ? ? ? ? ?12 15? ? ? ? ? ? ? ? ?12 12? ? ? ? ? ? ? ? ?10 10? ? ? ? ? ? ? ? ?11 I would say accuracy is + or - 2 Watts with this setup. Sorry, I have misplaced my dummy load. Anyway, is there anything I should be doing or looking at.? Otherwise, I'm enjoying the rig.
Ashhar Farhan All Messages By This Member #103085 Neil, Is this power output reading from your radio's display or is it from an external power meter? Can you remind us if you have a v2 or the de? - f toggle quoted message Show quoted text On Mon, Jun 19, 2023, 7:13 AM stone_ridge_road <AB7Echo@...> wrote: I would strongly urge that you do your tests into a good dummy load with known good connectors ... ideally with no cable ... before you do anything significant inside the rig.? And make sure you verify the power out with a decent external power meter instead of just relying on the internal readout. When troubleshooting you want to simplify as much as possible at each step. 73, Dave?? AB7E On 6/18/2023 5:30 PM, Neil Goldstein wrote: Sorry to reply to my own post, but I was hoping someone could advise me. Is there something I should be doing (see below) or should I be happy with these numbers? Thanks! --Neil, W2NDG Hi all,? After resolving my update woes (thanks Art N2AJO !!) I feel things are pretty stable. I know that the rig should be capable of upwards of 40 Watts on the lower bands. I'm not seeing that at 100% drive. Here is what I'm seeing, which I'm happy with, but would like to know if I need to tweak anything or look for a problem: (Into a fairly resonant antenna on most bands but tuned to close to 1:1) BAND? ? ? ? ? WATTS 80? ? ? ? ? ? ? ? ?15 40? ? ? ? ? ? ? ? ?18 30? ? ? ? ? ? ? ? ?20 20? ? ? ? ? ? ? ? ?21 17? ? ? ? ? ? ? ? ?12 15? ? ? ? ? ? ? ? ?12 12? ? ? ? ? ? ? ? ?10 10? ? ? ? ? ? ? ? ?11 I would say accuracy is + or - 2 Watts with this setup. Sorry, I have misplaced my dummy load. Anyway, is there anything I should be doing or looking at.? Otherwise, I'm enjoying the rig.
Neil Goldstein All Messages By This Member #103086 Farhan,? This is from a known good power meter. I ran the calibration routines back when you first discussed them so the sBITX power readout is pretty accurate up to 17M and a few Watts off on 15 - 10, but the numbers are from the external power meter.? On 80 and 40 I can bypass my tuner completely so those numbers are close to what I would see into a dummy load. On the rest of the bands as I said, I could be a couple of Watts low from actual power out from tuner loss.? Only a couple of Watts though since this antenna requires minimal tuning. SWR is better than 2.5:1 on all bands, and better than 1.5 on 80 and 40. I'll try to find the dummy load today, or borrow one, but I don't expect a huge difference. Maybe a Watt or two. Dave,? Known good connectors, known good short cables, and power readout from a verified Daiwa meter. I'm getting good signal reports from people. I had to back off the mic gain a little after the first couple of people said the audio was too hot.?? Again, I'm OK with these numbers, but I'm just concerned that something is off since I see others getting better power out at least on the lower bands. Thanks for the responses. --Neil
Neil Goldstein All Messages By This Member #103087 Sorry, this is my V2.? The DE is waiting for a dose of ambition to perform the mods. --Neil
Ashhar Farhan All Messages By This Member #103088 Neil, Next, with a dummy load connected, if ypu just run the txcal from webui, it should bring the power up. I hope the power supply is juicy enough. -f toggle quoted message Show quoted text On Mon, Jun 19, 2023, 5:03 PM Neil Goldstein <neilgoldstein@...> wrote: Sorry, this is my V2.? The DE is waiting for a dose of ambition to perform the mods. --Neil
Neil Goldstein All Messages By This Member #103090 Farhan,? Using a Jetstream 25A switching supply. I made an adapter to Power Poles with 12GA wire. --Neil
Neil Goldstein All Messages By This Member #103141 Well, I didn't find the dummy load I was looking for, but an old surplus one I picked up years ago. I ran TXCAL.? Here is the revised chart at 100% drive into the dummy load running through a Daiwa power meter: BAND? ? ? ? ? WATTS 80? ? ? ? ? ? ? ? ?29 40? ? ? ? ? ? ? ? ?38 30? ? ? ? ? ? ? ? ?32 20? ? ? ? ? ? ? ? ?32 17? ? ? ? ? ? ? ? ?18 15? ? ? ? ? ? ? ? ?20 12? ? ? ? ? ? ? ? ?18 10? ? ? ? ? ? ? ? ?15 This looks a lot better. Thanks Farhan!

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