Re: Sunil Lakhani's AGC board connections to uBITX
#ubitx
That's not the AGC board, that's the front panel board to one of Sunil's cases.? The AGC board is a separate kit from them.
Jim
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Re: Sunil Lakhani's AGC board connections to uBITX
#ubitx
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On Oct 29, 2018, at 8:09 AM, Jim Sheldon < w0eb@...> wrote: Anyone have the schematic that shows how to connect Sunil Lakhani's AGC board kit to the uBITX?? I found a diagram that had all the connections once, and like a dummy forgot to print or save it.? Now, it seems to have disappeared.? It is not in the .rar archive file available on the website.
Any help would be greatly appreciated.? Sunil, if you read this please email me directly w0eb [at] cox dot net.
Thanks,
Jim Sheldon, W0EB
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Sunil Lakhani's AGC board connections to uBITX
#ubitx
Anyone have the schematic that shows how to connect Sunil Lakhani's AGC board kit to the uBITX?? I found a diagram that had all the connections once, and like a dummy forgot to print or save it.? Now, it seems to have disappeared.? It is not in the .rar archive file available on the www.amateurradiokits.in website.
Any help would be greatly appreciated.? Sunil, if you read this please email me directly w0eb [at] cox dot net.
Thanks,
Jim Sheldon, W0EB
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Re: uBitX CW Sidetone Volume
Hi,
I installed a small pot (10k) in series with the line into the audio channel from the Raduino. The trace I broke is on the top of uBitx mother board to the right of the Raduino socket (looking at the board from the front). I cut the trace with a hobby knife, scraped the green paint off, and soldered the center and one end of the pot to those leads. The sidetone volume can then be adjusted and mine is down with the level of incoming signals. Make sure the pot (and the cut trace) is far enough to the right to clear the Raduino when it is plugged in.
73,
Bill KU8H
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On 10/29/2018 05:51 AM, Marko Pavlicevic wrote: Even after replacing R253 with higher value, CW TONE is still loud.
If I remove R253, I can hear CW TONE in headphones!
Is there a way to implement CW TONE volume control in RADUINO?
--
bark less - wag more
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Re: uBitX CW Sidetone Volume
Try a 10K or 1K preset (center and one end) parallel with C252,
this should work with 10K but if not try a 1K preset.
Raj
At 29-10-18, you wrote:
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Even after replacing R253 with
higher value, CW TONE is still loud.
If I remove R253, I can hear CW TONE in headphones!
Is there a way to implement CW TONE volume control in RADUINO?
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Re: uBitX CW Sidetone Volume
Even after replacing R253 with higher value, CW TONE is still loud.
If I remove R253, I can hear CW TONE in headphones!
Is there a way to implement CW TONE volume control in RADUINO?
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Re: SolderSmoke Podcast #207 uBITX 15 Mtrs, 60 mtrs, homebrew, antennas, Cubesats
Curt,
The relays mod work very well. Change only KT 1/2/3 . The filter mod looses power so skip and reduce your drive
and that will keep the spurs down.
Raj
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At 29-10-18, you wrote: Made my first ubitx contacts this weekend - wow. It does CW nicely with straight key, with reception via NESCAF audio filter. did some SSB in CQWW - worked 23 or more countries. transmit audio seems to be effective, so maybe this rig doesn't need a speech processor after all. doing a group build - 23 total rigs. some have been measured for spurious - and clearly are not in compliance. we will be modifying each one with added relays and a 45 MHz filter stage - this fix does bring them into compliance. This rig was so much fun to operate, I wasn't tempted by the other rigs in the shack as I just wanted to have a little operating fun. 73 Curt
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Re: SolderSmoke Podcast #207 uBITX 15 Mtrs, 60 mtrs, homebrew, antennas, Cubesats
Made my first ubitx contacts this weekend - wow.? It does CW nicely with straight key, with reception via NESCAF audio filter.? did some SSB in CQWW - worked 23 or more countries.? transmit audio seems to be effective, so maybe this rig doesn't need a speech processor after all.? doing a group build - 23 total rigs.? some have been measured for spurious - and clearly are not in compliance.? we will be modifying each one with added relays and a 45 MHz filter stage - this fix does bring them into compliance.? This rig was so much fun to operate, I wasn't tempted by the other rigs in the shack as I just wanted to have a little operating fun.? 73 Curt
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Re: Instructions on assembling VU3SUA kit
John
we are doing a group build here - using that case.? yes it is a bit of a snipe hunt!? do use the paper instructions, and visit ubitx.com which is managed by VU3SUA - he has some additional pictures there, and an assembly video there by another ham.?
a few key tips --
remove the front panel from the case.? trace color of wires using those pictures.? the bi-color LED is soldered to spots on the BOTTOM of the circuit board - I may have found this detail on line.? that front panel board with the 3 audio connectors is the main hub for case I/O.? that rear panel board with the digital I/O isn't needed right away (mine isn't installed yet).?
I am using the 4 pin connector for my microphone (I recycled an old speaker mike I had for now).?
Been using the ubitx for only a few days.? Worked several stations in CQWW.? the CW works once you get used to it - the straight key function is plug-and-play, paddle operation is not - it requires some extra series resistors to recognize dit and dah.?
email me direct if you get in a bind - I was beside myself a couple times at least trying to figure things out.? oh yes - it will require some not-so-hard mods to clean up the spurious.? success has been demonstrated by one of our club members.?
I am using my ubitx stock except for adding a NESCAF external audio filter to help with receiving.? Given how easily stations are copying me on SSB, the audio must be effective.?
73 Curt
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You can also use variable capacitors¡ or better yet varactor diodes to change the bandwidth electrically a bit: ? 
? ?
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From: [email protected] [mailto:[email protected]] On Behalf Of KM4TRT via Groups.Io
Sent: Sunday, October 28, 2018 10:59 AM
To: [email protected]
Subject: Re: [BITX20] Need 12.000 MHz crystals for the BITX40 #bitx40 #bitx40help ? I needed 9 crystals for a lattice filter to match within 50 hz so I bought the "grab bag" from china .? 50 crystals for about 6 bucks.
I built the test oscillator from Doug Demaws, QST article and found two sets of 9 within 50 hz.
The filter seems to work well.? It's a little tight if anything.
Andy KM4TRT -- ¡_. _._
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Luigi
I am a new ubitx user, and if you are using the stock firmware code that is initially delivered, maybe I know what you are referring to. There is a long initial delay transitioning to cw transmit when using a straight key. I have gotten used to it. Problem I have is if I place a long pause between characters,? it throws me off when the relay status comes out of transmit. while this delay has programable settings, it was even worse when I selected the shorter option. Sure I will try alternative firmware, but this likely can't offset the hardware.
Curt
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Re: VK4PP uBitx LPF BANK add-on Board
Hi Nick,
Put me down for a production board
Andy KM4TRT
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I needed 9 crystals for a lattice filter to match within 50 hz so I bought the "grab bag" from china .? 50 crystals for about 6 bucks.
I built the test oscillator from Doug Demaws, QST article and found two sets of 9 within 50 hz.
The filter seems to work well.? It's a little tight if anything.
Andy KM4TRT
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Whose code are you using?
Jack, W8TEE
On Sunday, October 28, 2018, 11:04:25 AM EDT, i4awxab1fj@... <i4awxab1fj@...> wrote:
I experience a delay between dots and dashes except at very low speeds which makes keying somehow erratic. Any cure for this? (Voltages for dots and dashes are correct).
Thanks,
73
I4awx Luigi?
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I experience a delay between dots and dashes except at very low speeds which makes keying somehow erratic. Any cure for this? (Voltages for dots and dashes are correct).
Thanks,
73
I4awx Luigi?
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Great idea! Seeing others experiment with ?C's in projects is terrific!
Jack, W8TEE
On Sunday, October 28, 2018, 7:38:35 AM EDT, Dennis Zabawa <kg4rul@...> wrote:
Another path to take, if you already have a 50 ohm dummy load, is to use that instead.? You will need to calibrate the system in that case.
I am working on a version of the DDL using a SparkFun, Microview module in place of the Arduino board and display and an MFJ, 300W Dry Dummy Load.? I am also adding a Peak power function to the sketch and a bootup option to enter the reference power reading and have the system self-calibrate.? It is in the 'breadboard' stage at this time and I will post the code, etc. when I have packaged it up and tested it in that form.
Dennis KG4RUL
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Instructions on assembling VU3SUA kit
I'm working on assembling/integrating the uBitX into this enclosure. I've searched with Dr Google but can only find a video that describes assembly and interconnect of the various sub boards that come with this nice enclosure.
Is there a more step by step guide or schematics to be had? If so , my google Fu must be faulty
73
John k5mo
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Another path to take, if you already have a 50 ohm dummy load, is to use that instead.? You will need to calibrate the system in that case.
I am working on a version of the DDL using a SparkFun, Microview module in place of the Arduino board and display and an MFJ, 300W Dry Dummy Load.? I am also adding a Peak power function to the sketch and a bootup option to enter the reference power reading and have the system self-calibrate.? It is in the 'breadboard' stage at this time and I will post the code, etc. when I have packaged it up and tested it in that form.
Dennis KG4RUL
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Re: QSX 10W HF Linear PA kit
I use a indelible marker to color the leads.
You can use an inductance meter to check, the higher one will be 3T ..
Raj
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At 28-10-18, you wrote: Hello from the rapidly warming and drying out downunder.
I have got as far as winding the transformers and installing them. My method for remembering which was the three turn and which was the two turn winding of T204 was to leave the tails of the three turn winding appreciably longer than the tails of the two turn winding. Now I have this transformer in my left hand, it has two windings, one has longer tails than the other. Now is it the three turn or the two turn winding? I should have written it down!
I have to comment on the excellent quality of the assembly manual. Well done and thanks, Hans!
vy 73 all.
Kevin VK3DAP / ZL2DAP
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Re: QSX 10W HF Linear PA kit
Hello from the rapidly warming and drying out downunder.
I have got as far as winding the transformers and installing them. My method for remembering which was the three turn and which was the two turn winding of T204 was to leave the tails of the three turn winding appreciably longer than the tails of the two turn winding. Now I have this transformer in my left hand, it has two windings, one has longer tails than the other. Now is it the three turn or the two turn winding? I should have written it down!
I have to comment on the excellent quality of the assembly manual. Well done and thanks, Hans!
vy 73 all.
Kevin VK3DAP / ZL2DAP
--
Kevin B. G. Luxford
kbgluxford@...
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Jim Sheldon
Raj vu2zap
MadRadioModder