Re: Ubitx evolving fixes updated to wiki? #ubitx # -help
#ubitx
i Tim, I believe Alyson has already cut up her board and can¡¯t really help you.
To a point I have.? That whole corner with relays was separated from the
rest to evaluate ground loops and layout.? However I have enough info
on the wiki and pictures as well.
I can also still answer questions on that so I can fill in what may be missing for some.
Allison
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Great!
For the fellow who sent me the mail order money order, thanks for the extra dollars, and we mailed your board on Friday. ?
I may gather my strength and order some more boards tomorrow
Gordon
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Hello Gordon,?
I received your LPF daughter boards today. They look great and will start working on your mod in the near future. I will let you all know how it works out.
Ripley
KD8UYQ
The words are mine but this iPad does what it will with them.
On Sep 12, 2018, at 11:56 AM, Gordon Gibby < ggibby@...> wrote:
All of the recent orders of 25 boards have now been mailed. If I do this again I¡¯ll be a little smarter, and list them as order of one, or order of ?pair of 2; ?I was able to find enough dollar bills to help out the people who bought more than one with
a bit of a refund, but that was a pain.
I improved the inside paper to have a repeat of some of the important information, links, etc
I¡¯ll mark them on eBay as shipped soon. ?I got to see the special stamp as mentioned by Kees I think
<image1.jpeg>
On Sep 11, 2018, at 16:28, Gordon Gibby < ggibby@...> wrote:
Well... now ALL of them are sold.? ?Glad I counted them this morning in the car and they seem to all BE THERE.? ?I'll work on envelopes tomorrow morning and hopefully get them ALL in the mail.? ?
Then maybe order some more.
As folks BUILD this little mod, can you indicate how you installed it,? what the problems or tricks you discovered?? ? i sure hope people can figure out how to do it --- be sure to use the correct relay because these relays DO SEEM TO BE POLARIZED --- Maybe
pay some attention that your relays actuall do work when installed!? ?If you flip a relay to the other side of the board --- YOU CHANGED THE ORIENTATION of the voltage applied to the coil --- and as I discovered the hard way, doing it incorrectly means they
won't operate!? ??
Cheers,
gordon
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New List of Ubitx resources
New list of ubitx sources. Added Allen Merrell KB4UD's 3.2 and 3.5 TFT's and?
HMI's for enchanced and basic Nextion
?
N5KBP
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Latest Dr. Ian Lee KD8CEC's firmware?
Raduino Source & Hex, MM EXE & HMI's for Nextion
https://github.com/phdlee/ubitx/releases/tag/1.1
?
Hex for I2C dspmeter
https://drive.google.com/file/d/1Oc-bGS34f0ragGXQ1lK6HHB7GhZLHZrP/view
?
Source for I2C dspmeter
https://github.com/phdlee/dspmeterv1
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Rich Neese KB3VGW's Custom Nextion Screens from 2.4 to 7.0 inch. TFT's and HMI's
https://www.mediafire.com/folder/mmu6ua683lk93/Nextion-Screen-1097
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BJ Pasteuning PD5DJ's 4.3 custom version. TFT only for 4.3 Nextion.
http://ubitx.net/2018/07/23/2831/
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Allen Merrell KB4UD's 3.2 and 3.5 TFT's and HMI's for enchanced and basic Nextion
/g/BITX20/files/3.2%20&%203.5%20for%20Nextion%20and%20CEC%201.095
-- N5KBP
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That's the same case i used, its a very nice sturdy case.
/g/BITX20/photo/0/1768?p=Created,,,20,2,1760,0
Joel
N6ALT
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Re: Right-sided relay harmonic attempted fix for v3/4 ubitx
Hello Gordon,?
I received your LPF daughter boards today. They look great and will start working on your mod in the near future. I will let you all know how it works out.
Ripley KD8UYQ The words are mine but this iPad does what it will with them.
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On Sep 12, 2018, at 11:56 AM, Gordon Gibby < ggibby@...> wrote:
All of the recent orders of 25 boards have now been mailed. If I do this again I¡¯ll be a little smarter, and list them as order of one, or order of ?pair of 2; ?I was able to find enough dollar bills to help out the people who bought more than one with
a bit of a refund, but that was a pain.
I improved the inside paper to have a repeat of some of the important information, links, etc
I¡¯ll mark them on eBay as shipped soon. ?I got to see the special stamp as mentioned by Kees I think
<image1.jpeg>
On Sep 11, 2018, at 16:28, Gordon Gibby < ggibby@...> wrote:
Well... now ALL of them are sold.? ?Glad I counted them this morning in the car and they seem to all BE THERE.? ?I'll work on envelopes tomorrow morning and hopefully get them ALL in the mail.? ?
Then maybe order some more.
As folks BUILD this little mod, can you indicate how you installed it,? what the problems or tricks you discovered?? ? i sure hope people can figure out how to do it --- be sure to use the correct relay because these relays DO SEEM TO BE POLARIZED --- Maybe
pay some attention that your relays actuall do work when installed!? ?If you flip a relay to the other side of the board --- YOU CHANGED THE ORIENTATION of the voltage applied to the coil --- and as I discovered the hard way, doing it incorrectly means they
won't operate!? ??
Cheers,
gordon
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Startied using uBit-x-Happy-Happy
I got my uBitx a few month ago, but only made 1 or 2 contacts as I was busy building stuff. Then I got really interested with Dr. Ian's Nextion screen mod.
SO I downloaded 1.097 firmware and added a 2.4 Nextion touch screen and WOW.
Having lots of fun learning the screen while making 1500 mile contacts? (central fl. to amarillo TX ,R.I , New Jersey, etc. The guys at our club got excited about this conversion.
Thanks Dr. Ian. and Fahran? I still have a lot of mods/ ie signal display etc.
Andy KM4TRT
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Hi Thomas:
I have a Raduino for the BitX40 excess to my needs, $20.00 and some S&H to your QTH. If you want I can program it for whatever version you. Let me know
73 Ross Bell, K7RSB
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Re: UBITX Q90 mod with BFR106
Some basic testing of Q90 stage only. I made up a quick proto PCB with the PA stages in a 'straight' line.? Loaded Q90 stages only using the BFR106 device. I used a BN43-2402 core for T8 with 4 turns bifilar 0.25mm wire. Allison's mods....R81 = 2k7 (gave exactly 12mA for the stage). C81 = 470pF, R83 = 8R2. Tested with 12v supply. 7mV rms (~-30dBm) from HP8640 sig gen, RV1 at max and measured out with scope. Now waiting for 2N2222A's to arrive to test next stage.? Meanwhile, lots of 'through-holes' to solder in. 
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Mark: I totally love my case, it is very sturdy and I think looks good. Check it out at /g/BITX20/album?id=69609. David A Posthuma, WD8PUO 1 (616) 283-7703
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Mark M Sent: Monday, September 17, 2018 3:33 PM To: [email protected]Subject: Re: [BITX20] Simple spur fix I was hoping to use the approach the Kees is using and replace the onboard filter using the QRPLabs relay board...remove the existing relays, etc, and graft the relay board into that area. I think it would be doable but I'm using the amateurradiokits case and there isn't much room to add anything in. I don't think it will be difficult to tweak the firmware to select the appropriate filter if I can figure out how to mount the board. I may have to transplant the uBitX to another case. Or maybe order one of Kees' boards. Mark AA7TA On 9/17/18 3:09 AM, kc1at via Groups.Io wrote: I'm using them as external filters with a rotary switch. Still waiting
for the final fix for the ubitx.
I got a bunch of QRP Labs kits that I want to expand that use the
relay board and filters once we have a fix for the ubitx.
don
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Mark
My problem is that the mod's are coming in fast and furious and being a tinkerer ....I'd rather tinker than talk. SOOoooo I've already pulled the top off my case and have wires and boards hanging out all over the place. Lots of fun. When the mod's slow down I'll look for another case. I'm leaning towards Kee's 6 filter board cuz I know I'll want to do more with this ubitx. Got to get the mod's done first to estimate the case size.
My current problem is my Tektronix 491 SA is dead AGAIN. (got to dump that and a reliable SA)? So I have to depend on other folks to analyze the fixes.
don
?
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Yes, we did, because we have a new one that we will post shortly. I'll make a post to the group when it's ready to go. There are still a few hiccups in the code, but we want to at least get out the idea of what JackAl's all about.
Jack, W8TEE
On Monday, September 17, 2018, 4:16:26 PM EDT, Brian Bowling <bowlingb@...> wrote:
You pull this down already Jack?? I'm getting a 404 today 9/17/18 at 4:15pm EDT.
--
73,
Brian - N8BDB
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You pull this down already Jack?? I'm getting a 404 today 9/17/18 at 4:15pm EDT.
--
73,
Brian - N8BDB
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Mark look at the wiki...
Or use a bigger box.
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I was hoping to use the approach the Kees is using and replace the onboard filter using the QRPLabs relay board...remove the existing relays, etc, and graft the relay board into that area. I think it would be doable but I'm using the amateurradiokits case and there isn't much room to add anything in. I don't think it will be difficult to tweak the firmware to select the appropriate filter if I can figure out how to mount the board. I may have to transplant the uBitX to another case. Or maybe order one of Kees' boards.
Mark AA7TA
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On 9/17/18 3:09 AM, kc1at via Groups.Io wrote: I'm using them as external filters with a rotary switch. Still waiting for the final fix for the ubitx.
I got a bunch of QRP Labs kits that I want to expand that use the relay board and filters once we have a fix for the ubitx.
don
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Re: UBITX...getting to legal ???
Ok Allison, if the IMD issue is confined to the first stages as it seems then won't the operator be blamed? If this is the case, the IMD issue in the uBitx would produce just a very limited negative externalities.
Iz oos,
Generally yes presuming anyone notices.? Its also about how bad.??
Too many yabuts to call.
Allison
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Re: UBITX Q90 mod with BFR106
To get from ideal to real you need series R (both copper and ferrite losses), coupling less than 1,
and stray inductance.
The cap at 470 PF as emitter bypass was to compensate for the crappy amp that followed it.
It was never there to flatten Q90, quite the reverse.? Even then I found the value of the cap
to be variable from 330 to 1000pf depending on the radio.
The original was with 10ohms and .01uf on the emitter of the Q90 amp.? It was farhan that
proposed 470pf and 8.2ohms to try an flatten the gain of the entire amp.? The goal (then)
being set RV2 for 12-13W at 80m and get more than 2W at 10M.
Also the original feedback R was 1K (collector to base) which gave on some units with
3904s from 22ma to as high as 30ma.? That is both too much current and?forces the
3904 to about HFE of 50 or less. plus the high emitter voltage drop (.2.2V) and
collector voltage drop n R84 (10 ohms) means the part has a available voltage
swing under 4.5V into maybe 200 ohms.
Ideally we want flat for Q90 and stages after that.? The problem is NOT one of them is
flat to 30mhz.? And I never measured 18DB power gain with a real 3904 at 30mhz,
the best I've gotten was 12db.
The actual amp is 11db down for most and varied from 9db down to some 13db
down at 30mhz. (sample size 5).
Beta being FT/Fop it can't be more than 10 at 30mhz for a common emitter amp.
That being the case a 10DB amp using 3904 would be flat to 30mhz.
For spice to be valid all devices and element have to be real.? The difference using
Genesys using library ideal to real often was day and night.??
Allison
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Re: VE1BWV audio pop fix - lost my sidetone
Yes, the VE2BWV modification really works. I built it "on air" around the audio IC U1.
Sidetone got very weak, however.
I suggest to? the following:
-remove R253. This cuts even the rest of the weak sidetone.
-solder a wire from R252/253:s junction to R75. Now the sidetone goes to unused half of U1.
-take the amplified sidetone out on the other side of U1 pin 3 (C72).
-route the amplified sidetone directly to the speaker (pin 7 /brown wire) on ANALOG jack of motherboard.
You might want to put some serial resistance to the wire, but in my case the sidetone volume is just right.
KEEP IT SIMPLE!
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Re: UBITX Q90 mod with BFR106
Allison,
concerning the transformer You are right, I only modified the
"ideal transformer" by using a coupling coefficient <1 (stray
indicutance) but not the ??? (loss) of teh ferrite material.
Doing the same simualtion with a 2N3904 with the same "ideal
transfomer"gives 3 dB gain at 3 MHz and 18 dB at 30 MHz then
falling off.
Playing with the emitter cap from 470 pf to 4700 pF gives a
"flat" gain from 3 MHz to 30 MHz but this is not what we want,
don?t we?
To conclude: the simulation gives some hints of how a circuit
will behave, but no calculator/simualtor can give the correct
results if not all relevant parameters are put in!
Henning
Am 17.09.2018 um 16:36 schrieb
ajparent1/KB1GMX:
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Henning,
The model does not have the fact that the transformer is FT43
material with more than
desirable number of turns so by 100mhz its into the absorptive
range.
The actual sweeps show its has gain at 120mhz but well down not
due to the device but?
the rather horrid layout, transformer, and strays.? Never mind the
lossy g10 under it.
Try the same model with 3904, if it not well down the gain curve
at 30mhz you model is broken.
Allison
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Re: UBITX...getting to legal ???
Ok Allison, if the IMD issue is confined to the first stages as it seems then won't the operator be blamed? If this is the case, the IMD issue in the uBitx would produce just a very limited negative externalities.
Il 17/set/2018 17:08, "ajparent1/KB1GMX" < kb1gmx@...> ha scritto: IMD is a signal quality thing.? For many digital modes it represents undesired distortion that can increase error rate.
If the IMD is from later stages then it can be a bigger deal as then it can easily be heard as a "broad" signal
and can cause the operator to be unpopular.
Allison
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Glenn,
You put up the image, I just put it where it can be easily found again and with related info.
The wiki needs work and I will gladly put stuff there for those that would like to add
but don't want to mess with it.? ?That said it is easy to use.
Allison
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Joel Caulkins/N6ALT
Ripley
David Posthuma
Brian Bowling