Re: uBitx Modulation only lows no highs in frequency response
Bj?rn, If you are using the electret element that came with the uBitx, I would try a different one. I haven't been able to use the mics that came with any of my Bitx kits because of bad audio quality. I bought a whole bag of them from a eBay vendor for just a few dollars that work perfect.
Joel
N6ALT
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Re: RF power chain mods and improvements..
On Wed, Jul 18, 2018 at 07:02 PM, ajparent1/KB1GMX wrote:
In context they worked in that they were marginally better than the 2n3904s, but compared
to the 2n2222A or 2n2219 they were not very good.? ?Compared to 2n3866 they were poor.
Hi Allison, So it sounds like you found the 2n3866 superior to the 2n2222a ?at some point in the chain. To avoid having to repeat what you have already tried could you share with us at which point in the chain, i.e. driver, predriver & did you use one or two or four? 2n3866¡¯s are pretty pricey but not unobtainium from a reliable source. And do tnis superiority apply to all bands or just to the higher frequencies? If this is obvious or you have already stated it, I apologize for having missed it (and it¡¯s obviously not obvious to me...) please do not give up, your opinions knowledge and findings are well respected here and elsewhere. Thanks. And thank you for your patience. Sincerely, Jerry aa1of
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I am away so this is from memory.? If you are using the Nextion screen and click on the data display with version, etc you will get a display with an option to monitor the ADC voltage, i.e., the input on the purple wire
to A7.? This will give you an idea of the voltage levels.? I think I set the low end and the high end and let the system figure out those in between and it looked kind of decibel/logarithmic to me. I didn't try to make it reflect precise, textbook s units.
Pat AA4PG?
Pat Griffin
http://www.cahabatechnology.com
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So, what I need to do is measure the voltage at J1 on the AGC at very low and high signals and then guess for what is between those two extremes?? How did you come up with a setting of 217 for the high end based on your 4 volt measurement?
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Most of my settings was just so the s-meter responded like I wanted it to.? I have a service monitor so (if I remember correctly) I set if for 50 u Volts ( the often stated reference to s-9)and started with all the bars but not the + displayed.? That did not give the response I wanted.? I did run the signal level up very high and the most the AVC circuit put out was about 4 volts.? Safely under the 5 volt max of the Arduino.? I think that may? have been where the 217 came from.? That gives the ++ at the end of the bars on my ubitx.
The Arduino takes a signal from 0 to 5 volts max on that pin so the voltage has to be in that range.? I always get the exact number confused but the range has to be from 0 to 255 or 0 to 254 on that input the way the program is written. If you set a number of over 254 or 255 strange things may happen as it over ranges the program parameters.
Feel free to use any numbers from a low of 1 to a high of 254 and just play with them so you get the s-meter to respond to your liking.? I would think everyone would use a different setting due to different antennas.? At the time I was playing with the settings I was on 80 meters with a 1/2 wave dipole up about 50 feet.? I have not taken the time to check out other bands to see how it reacts there .
de ku4pt
On Thu, Jul 19, 2018 at 2:41 PM, Bill Carpenter <nz0tham@...> wrote: So, what I need to do is measure the voltage at J1 on the AGC at very low and high signals and then guess for what is between those two extremes?? How did you come up with a setting of 217 for the high end based on your 4 volt measurement?
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So, what I need to do is measure the voltage at J1 on the AGC at very low and high signals and then guess for what is between those two extremes?? How did you come up with a setting of 217 for the high end based on your 4 volt measurement?
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Re: RF power chain mods and improvements..
?So, I'm getting ready to have some number of our Alachua County ARES people built ("install" might be more accurate)? uBitx / Bitx40's.? ?
All these wonderful improvements y'all are developing and testing will be a huge help to us (AFTER we get their stock versions to? work.....).... so this morning I put in an order for?
10 2n2222As
10 2n3866's
100 2n3904's with an Ft of 300 Mhz --- I use these things all the time and it was cheaper to buy a lifetime supply than to buy a smaller number....
I wonder if the higher Ft-version of the 2n3904 would make any significant difference, or if the one that is already in the uBitx has an Ft that high?
Thanks for all the work y'all are doing --- it will help a bunch of Technician licensees see even more reason to graduate up to higher licensure.....we did 5 Extra's last year and hope to do a bunch of Generals this year....
gordon
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I work with US supply vendors and in some cases ask for COC or similar documentation and get it.
Many of the companies I've dealt with for decades.
Its not a bargain if I get crap and wait twice the time to get it because I had to order and
pay for it again. In general I feel the risk and wasted time for ebay and similar is not
worth it.
I'd bet the market for leaded parts is more ripe for scams and fakes.? Solution,
use SMT parts as they are cheaper more readily available and less likely to be faked.
Yes, they are small but some offer better performance at higher frequencies.
Same for the resistors and caps.? I dead bug (ugly/manhattan construction) them too.
Allison
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You may start out something like this.
4,36,71,140,175,212,217
They should range from? 1 to a max of 254.? My board only put out about 4 volts max so the 217 number was the most for me.? You can adjust the numbers to suit you.?
On Thu, Jul 19, 2018 at 11:01 AM, Bill Carpenter <nz0tham@...> wrote: Any suggestions for the S-meter numbers to start out with?
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uBitx Modulation only lows no highs in frequency response
I have the uBitx for a couple of days now, and have several "issues" with it.
One of them is modulation frequency response.
Monitoring my TX audio sounds like talking through a cloth or something, no high tones are audible.
Is this normal behaviour of this kit?
I have done all the alignments, Masterclock/BFO
?
--
73' Bj?rn de PD5DJ
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Got it working!? I tried Ian's settings which were way off for me.? Ended up at 5 on the low end to 60 on the hi end which may still be a bit "Scotch" but I want to try it at that for a while and then adjust.? Thanks everyone for all the help!
73, Bill NZ0T
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Yes, it is attached/plugged at J1 which is the positive end of C4.
73 Kees K5BCQ
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Re: uBITX adjustable power supply?
I just received a five pack of the same boost converters for the same purpose. I'm very interested, also, what anyone's experience has been with these.?
I'll let you know when I try it.?
Tom, wb6b
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Re: surprising CW sidetone value in uBITX Manager 0.11
#ubitx
Looks like I'm the only person on this thread, but in case someone else is reading...
I finally found the spot on Ian's Github where he released the new version of uBITX Manager that goes along with 1.08.
The fact that it was released outside the master branch of the source tree threw me off.
Looks like he is not open sourcing the manager app.
If anyone reads this and knows differently please let me know.? Thanks.
73 Mike KK7ER
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Watch Ian's you tube videos and use his to get you started?
Sent from my Samsung Galaxy smartphone.
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-------- Original message -------- From: Bill Carpenter <nz0tham@...> Date: 19/07/2018 16:01 (GMT+00:00) Subject: Re: [BITX20] S meter wiring
Any suggestions for the S-meter numbers to start out with?
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uBITX adjustable power supply?
Has anyone used this boost power supply to feed their finals?
It would seem to be perfect for adjusting the voltage to the FETs.? I haven't tried it yet.? I wonder if you have to adjust the bias when doing something like this?
Cheers,
Jim W0CHL
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BTW..
The schematic can be found in the Files section under W3JDR
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Re: RF power chain mods and improvements..
I work with US supply vendors and in some cases ask for COC or similar documentation and get it.
Many of the companies I've dealt with for decades.
Its not a bargain if I get crap and wait twice the time to get it because I had to order and
pay for it again. In general I feel the risk and wasted time for ebay and similar is not
worth it.
I'd bet the market for leaded parts is more ripe for scams and fakes.? Solution,
use SMT parts as they are cheaper more readily available and less likely to be faked.
Yes, they are small but some offer better performance at higher frequencies.
Same for the resistors and caps.? I dead bug (ugly/manhattan construction) them too.
Allison
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Hi Guys! The boards arrived today(picture below), so I'll be starting to populate them ASAP. I'll be away most of next week, so progress might be slow starting. 
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Any suggestions for the S-meter numbers to start out with?
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Joel Caulkins/N6ALT
