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Thanks Jared!
I was hoping somebody else was seeing it too.? It looks like you have exactly what I have.? I'm a little less worried now. So for anybody else that wants to try it: It's not audible and you won't see it unless you run your SPAN out to 25K. Also, it might be WAD(Working As Designed).? That was really my question.? Is this the way it's supposed to be?? At least for now.? I still can't help but think it's desensing the radio somewhat. Is this something were a few cheap capacitors can knock the birdies out and take this radio to the next level sensitivity? |
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I haven't tried running it on battery yet but, I use an old analog(non-switching) Astron power supply.? It shouldn't be producing any noise.? Although, I am looking to run on battery this weekend and kill the power to the house to see if I see anything change.? But, that test requires some prior coordination at my house.
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I have the same issue.? It persists across all bands.? I've always just assumed this was an issue in the SDR and haven't really worried about it too much.? It doesn't seem to impact normal operations.?
I recently swapped out the 5V converter and that seems to have made a pretty significant difference in the noise floor though.?? Jared |
开云体育Would be interested in 2 when you get it finished as I have 2 V2s Gerry Sherman Sent by the Windows 11 Thunderbird On 2024-04-25 23:32, Jeff Duce wrote:
This is still a draft, need to double check the encoder footprint...? I'm not sure what encoder is in the radio, and the footprint I have needs a bit of tweaking to fit the right encoder.? (In theory, most any encoder would fit, but the tabs that hold it in place seem to vary a bit from one manufacturer to the next).? Also need to add more style points :-).? I'll be busy all weekend (might actually be on the radio for a bit), so I'll have to come back to this next week.? It's looking like price might be around $4usd+shipping for blank boards, and maybe ~$10 for board w/ parts (depending on which encoders are picked).? Very preliminary numbers.? I'll want to make sure I get a few and test it out before a order a bunch, so probably a few weeks away from being a real thing. |
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software build
Morning All
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This is still a draft, need to double check the encoder footprint...? I'm not sure what encoder is in the radio, and the footprint I have needs a bit of tweaking to fit the right encoder.? (In theory, most any encoder would fit, but the tabs that hold it in place seem to vary a bit from one manufacturer to the next).? Also need to add more style points :-).? I'll be busy all weekend (might actually be on the radio for a bit), so I'll have to come back to this next week.? It's looking like price might be around $4usd+shipping for blank boards, and maybe ~$10 for board w/ parts (depending on which encoders are picked).? Very preliminary numbers.? I'll want to make sure I get a few and test it out before a order a bunch, so probably a few weeks away from being a real thing.
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开云体育Yeah I plan to use large ground planes on both sides with lots of vias to tie the two together.? I've thought about adding ferrite beads to the data lines as well, but not sure that would do anything. From: [email protected] <[email protected]> on behalf of Scotty R <Theroadcalls1@...>
Sent: Thursday, April 25, 2024 5:54:46 PM To: [email protected] <[email protected]> Subject: Re: [BITX20] sBitx schematic for rotary encoder board? #sBitx #sBITX_v3 ?
I have not spent much time looking at the encoder, but as I remember,? the extra components added were intended to debounce the contacts. Another individual said all debouncing was done in the? software. Not really sure if it matters which approach
you take though. The goal is smooth reliability. My biggest concern is multiple birdies, presumably mixer byproducts. I think some rf shielding on the boards might help some. I hope this helps.?
Scotty WD4PYT?
On Thu, Apr 25, 2024, 6:41 PM Jeff Duce via <jefe_de_estado=[email protected]> wrote:
So here's what I'm currently assume the schematic to look like.? I need to take my radio apart to verify, but I won't be able to do that for a few days.? If anyone else knows if this is correct, let me know.? There was discussion in another thread about adding caps and resistors.? Any thoughts there? |
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I have not spent much time looking at the encoder, but as I remember,? the extra components added were intended to debounce the contacts. Another individual said all debouncing was done in the? software. Not really sure if it matters which approach you take though. The goal is smooth reliability. My biggest concern is multiple birdies, presumably mixer byproducts. I think some rf shielding on the boards might help some. I hope this helps.? Scotty WD4PYT? On Thu, Apr 25, 2024, 6:41 PM Jeff Duce via <jefe_de_estado=[email protected]> wrote: So here's what I'm currently assume the schematic to look like.? I need to take my radio apart to verify, but I won't be able to do that for a few days.? If anyone else knows if this is correct, let me know.? There was discussion in another thread about adding caps and resistors.? Any thoughts there? |
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So here's what I'm currently assume the schematic to look like.? I need to take my radio apart to verify, but I won't be able to do that for a few days.? If anyone else knows if this is correct, let me know.? There was discussion in another thread about adding caps and resistors.? Any thoughts there?
The area I'm not totally confident is the 5v line.... does that connect to the switch?? |
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I have a persistent birdie at the top of the passband.? It shows up on all bands and doses not move when tuning.? It is not audible because it is too high in frequency to be heard but, it shows up in the passband.? I can't help but think it is desensing the receiver.
Does everybody have this birdie or is it just me?? Is this WAD(Working As Designed)? I connected a dummy load to make sure it wasn't something from the outside world. These are the pictures before I replaced the noisy 5V converter.? Replacing did clean up a lot of the background grass but didn't get rid of this birdie. I Here I tuned around 21.167 to show all of the other audio moved but not the birdie. |
AE9J
Aaron K5ATG
Mark
Scotty R