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Re: BITX40 Saving Settings Issue
Hi Gary,
Perhaps there is a problem with your PTT_sense line. The CW options in the SETTINGS menu are only available when the PTT_sense mod is installed. Double-check the PTT-sense wiring and resistor value (10K). Background: When you power on, the software first checks whether or not the PTT_sense mod is installed. It does this by testing the logic level on the PTT_sense input. If the mod is installed, the PTT_sense line will be LOW. If it is NOT installed, the PTT_sense line will be HIGH. 73 Allard PE1NWL |
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Re: calibration question
#ubitx-help
It seems out of calibration. To be sure follow the hint of using AM broadcasts on shortwave. They are exactly on the frequency they are supposed to be. You can use either LSB or USB and tune exactly to the point where you 'zerobeat' the carrier, so you don't hear the carrier of the AM broadcast and the audio sounds good. Read that frequency, eg. If you read for instance 15248.5 instead of 15250 you may want to calibrate. My uBitx was only 150hz and I left that like this. Il 30/ago/2018 18:44, "Mike KK7ER" <groupio@...> ha scritto: Two questions: |
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Re: Nextion 3.2 for CEC 1.097
#ubitx
¿ªÔÆÌåÓýJohn, Nikos ? Worked on page px 11 and 0 ?¨C not everything is correct but is about 90 percent. ATT and IFS don¡¯t function correctly yet. Could be some others. I will stopped for today. Nikos I guess you have control until I hear back from you. Give it a try ? Art ¨C N2AJO ?
? From: [email protected] [mailto:[email protected]] On Behalf Of SV9CVJ Nikos ? HI John |
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Garbage in, garbage out.
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And when fabbing PC boards, you really don't want garbage. This world has way to many coffee mug coasters already. . A local software tool such as Gerbv or GerbView will allow you to preview the files and see what's wrong. You might also look over OshPark, they have a great front end for ordering boards. ? ??https://docs.oshpark.com/submitting-orders/preorder-checklist/ They give a good rendering of exactly what the board will look like before you enter your credit card number and pull the trigger. If you can get it to where the board passes their checks and looks right, you have a good chance of getting back a usable board. Jerry On Thu, Aug 30, 2018 at 11:45 AM, Ben Holmes wrote:
You might find this amusing, but I already did this... and Fiverr responded with the following: |
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Re: UBITX V3 TX GAIN VARIATIONS
Gordon Gibby
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Re: CW PTT attack time to slow
#ubitx
Another user installed the KD8CEC software and found it to be an improvement.
Changing the pull up will not help the issue.? The factory code is slow in recognizing keying. Allison |
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Re: uBitx Unfiltered
Allison had some good pointers on some first easy fixes to the uBitx in post
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? ? ?/g/BITX20/message/57649 First and foremost, either fix the on-board transmit LPF routing somehow or add an external LPF between the uBitx and antenna appropriate to the band you are using. Beyond that, she suggested replacing Q90 with a BFR106, reduce C81 to 470-1000pf and replace Q911,912,92,93,96,97 with 2n2222's to get a more even power across the bands. These mods are not of much use if you are just using it on the lower bands to avoid spurs. ? But if the current power amp is coupling into the IF amps and creating extra spurs and we need significant mods to get the uBitx power amp to give reasonably clean and flat power across all of HF, then perhaps best for the power amp to be a separate board. So clean up the local oscillators and signal levels into the mixers on the uBitx. Then saw off (or disable) the back end of the uBitx where we have the power amp and LPF's and LPF relays. Replace that back end with a separate board for the power amp and LPF"s. Perhaps use kits that Kees has up at? ? ?? Perhaps use Han's upcoming QSX 10W amp, which he is planning to sell separately: ? ??/g/BITX20/message/57420 ? ?? If required, add per-band filters between the exciter and the new power amp board. Would be nice to have a simple analog SSB exciter and receiver that works well from 3-30 mhz. The uBitx can fill that role.? The QSX may turn out to be a fine rig, but the uBitx can remain the rig of choice for analog experimentation.? Not all of us want to play with DSP firmware. ? Jerry, KE7ER On Thu, Aug 30, 2018 at 10:32 AM, ajparent1/KB1GMX wrote:
I still believe "there is a pony out there" .....small handful of parts and a good dual relay switched LPF board. |
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Re: Amplifier
#ubitx
#ubitx-help
#parts
Due to filtering issues and spurious outputs doing that is not recommended.
If you do, familiarize yourself with telecommunications rules that apply to your country.? You may not be in compliance. Allison |
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You might find this amusing, but I already did this... and Fiverr responded with the following:
Unfortunately, your Gig request "Gerber Files... Convert RS-274D to..." did not pass our review. It was misleading or unclear. Please explain, in a clear way, what service you need. Repeating these violations can result in your account being restricted. |
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Re: UBITX V3 TX GAIN VARIATIONS
Gordon,
For better than 10W on 80 and at least 7 on 20.... Replace q90 with something better, BFR106 was good. MMBT2369 is ok. Replace the standing 3904s with 2n2222A(to18) part. Hint installing them from the bottom makes for better and easy. take care to get them oriented the right way.? Also the cans for adjacent devices can touch as they get connected together at the board. Test results.? On 5 of 5 that got the power up with minimum fuss. 10M will be better but not great maybe 2-3 more watts. IF you don't want the power to soar on 80 try 470 to 1000PF at C81 (470, 510, 680, 820, 910, 1000pf are standard parts). Pick the one that gets 80 tamed and 40 and 20 decent.? Getting 12W at 80 and 8 at 20 should be easy.? IF 30M is down its the output low pass filter as 30M is near the cutoff frequency but? not less than 5W and I usually saw 7w or more. Allison |
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Re: CW PTT attack time to slow
#ubitx
This might be a possible fix:?https://qrpguys.com/ubitx-cw-conditioning-adapter
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CW PTT attack time to slow
#ubitx
Joop Stakenborg
Hi there,
just finished a ubitx build and I am trying to use it with my K3NG arduino keyer. I have set the CW configuration to straight key. The keyer output is open collector. I get a nice sidetone and there is enough power output, about 11 Watts on 20 meters. But if I use the paddle the PTT response is to slow, either the first ¡®dit' is lost or the first ¡®dah' is turned into a ¡®dit¡¯. Does it help changing the pull-up resistor at the keyer input? Anyone have a suggestion? Regads, Joop PG4I |
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Re: uBitx Unfiltered
On Thu, Aug 30, 2018 at 09:14 AM, Kees T wrote:
Since there is not much shielding between sections on a uBITX, wouldn't it help going to RD16HHF1 (or RD15) part, so at least the MOSFET Source lead can be solidly grounded vs tying it to a "heatsink antenna". I would also make those MOSFET leads ALL "REALLY short".I've side stepped that.? That has been done on every IRF510 amp in Bitx and a big handful more radios out there.??In every case my reaction to that is, it is insane.? ?Everyone I see I tell them heat sink paste, insulator kit, and ground that heat sink.? The difference is better heat remove is the sink is outside the case and less RF all over.? ?So far I know of two kits that do not do that and both are the most stable I've seen maybe they have learned something. Three things shall be done, ground the heatsink, if it is inside a box provide openings to allow convection cooling to happen, and keep the leads on RF power devices short and that includes traces on the board. For those that want to try that:? Get the heatsink and insulator kit.? Bend the leads at the case UP 90 degrees and then install with the case of the mosfet flush to the bottom of the board.? The heat sink is not in an awkward place (under the amp).? Solution is thick aluminum L (.25" minimum) to the rear wall (aluminum) of the box with a finned heatsink outside.? Use insulator kits and (non conductive) thermal transfer paste.? Everything gets bolted up solid for best heat transfer. Allison |
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Re: uBitx Unfiltered
I still believe "there is a pony out there" .....small handful of parts and a good dual relay switched LPF board.
73 Kees K5BCQ? Isn't the rest of that is "I can smell it...." Yes ferrite and a few more caps in the right places plus some top pour of copper with stitching to tie it all down so ground (there is no such thing) has less transverse current paths and lower surface resistance.?? Why say that...? Adding parallel caps is useless if the ground it goes to has RF resistance (or inductance).? The DC lines start right next to the power amp so ferrite and caps liberally spread about limits the distribution.? At one point the? R18, R28, R38, and R48 were tried at 330 ohms with 9.6V Zener at each corresponding cap to ground was added.? That stuffed the spurs (not the primary ones) down by 6DB.? ?So yes there undesired RF on the switched DC. Allison |
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Amplifier
#ubitx
#ubitx-help
#parts
??? ??????
Hello everyone I want to amplify the power by amplifier so i want the amplifier for it with simple so i want some suggestions
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Re: UBITX V3 TX GAIN VARIATIONS
Gordon Gibby
¿ªÔÆÌåÓýThanks so much Allison --- now that I have a handle on the harmonics, working on Q90 will be one of my next projects.? ?That looked like the easiest gain target....?? I have read your posts earlier and purchased parts...just need to get that project done
sometime.? ?I have two people inour group planning to build uBitx's.? ?If I can get 10W on 80 and 5 watts on 30 I'll be pretty happy for my digital goals.
I have a transistor amp (and switched LPF system) waiting on me somewhere to connect up.? ?Had to tame the harmonics a bit before that was a possibility.? ?
Cheers,
gordon
From: [email protected] <[email protected]> on behalf of ajparent1/KB1GMX <kb1gmx@...>
Sent: Thursday, August 30, 2018 1:17 PM To: [email protected] Subject: Re: [BITX20] UBITX V3 TX GAIN VARIATIONS ?
VEry annoying I attached three things and none followed the post!
So 2n2222A datasheet 2n3904 data sheet and picture of said amp built on Kitsandparts board. |
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BITX40 Saving Settings Issue
hamhog1
Just finished putting the BITx40 in an enclosure and most things are working.? I set it up first in the default configuration and tested per directions.? I then installed sketch v.1.28 per instructions and all seemed well. Next I did all the modifications for raduino-v1.28 except the capacitance touch sensor.??
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One issue is that when I make changes in the Settings and set up the rig for cw operation, when I shut down the rig, I lose all the previous settings for cw and only lsb or usb is available.? When I turn on again the VFO may show the mode as CWU/L but no keyer or ptt and when I go to Settings no CW options.? I am not able to send cw and cw is not shown as one of the modes available when go to Select Mode.? If I do a default reset and then set up cw it works until I shut it down.? Then I lose the settings. Must be missing something.? I downloaded v1.28 again and reinstalled it. No luck.
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Another issue I have is that the CW Spot does not work.? I have installed a momentary push switch, but it appears to not be grounding the pin.
I am impressed with the rig and it works perfectly when set up either for ssb or cw with the above exceptions.? Only when I shut down, I lose the settings.
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Thanks for any help.
Gary K4VIG
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Allard PE1NWL
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