Date   
Re: Project : Ubitx go box with batteries (topic will be updated upon works done)

John (vk2eta)
 

Hello Adrien,

Regarding the Mic preamp I would consider the SSM2167 based module rather than the MAX9814 as based on my usage of both the MAX is more of an ALC type rather than compressor type as is the SSM based module. 

I get good on-air reports with the SSM2167 module and the average power is close to double the bare board.

Be mindful of the spurs issues with over driven Mic input (may be less of an issue with the V5 boards). A trim pot on the output of the module is a good idea.

73, John

Re: ssm2167 board for compression #ubitx #ssm2167

John (vk2eta)
 

Hello Brad,

Your tests results and analysis explain the results I observed with my SSM2167 module where I had no change when adjusting the noise gate (the Mic sound input was always on).

I would prefer to avoid another trim pot on the module and simply have a two resistor divider after the cap, can you share the value and approximate position of the pot on the input side (towards the Mic element)?

73, John

Re: Current v5 ubitx fixes adequate? Is there a thread about v4 fixes?

iz oos
 

Regarding the spurs in ver3 and 4 I found that the solution by Farhan helped. If it not enough, for the 10m SSB (there is no spur issue for CW) an external high pass (corner frequency at say 27Mhz) filter should work 100%. There is a residual fixed spur at 12Mhz when you speak, I found it very low in my unit, however I look forward to receiving my Antuino :) to check it more thoroughly.


Il 27/ago/2019 15:45, "Don - KM4UDX" <dontAy155@...> ha scritto:
Curt, all points taken and well said.   I'm slinking back to my marginally compliant operation. 

One, of several, reasons I like this hobby is mixing it up with folks who really know their stuff.  I've learned more than I thought I could by reading and re-reading all the posts from all RF engineers here.  As a humble liberal arts major, it is with great humility that I walk the uBITX halls. 

Thanks millions for all the pointers.  

Don
Km4udx


Re: Apartment antenna question for uBitx #ubitx

f1mqj
 

Perhaps you could try windom/OCFD
https://www.aerial-51.com/model-404-ul/
http://www.dj0ip.de/off-center-fed-dipole/40m-ocf/version-2-2/
https://hamwaves.com/cl-ocfd/en/index.html
They seem work fine on 40-20-15-10 m without tuner, 17/12 with tuner, 30m perhaps, and can work bended (cf hamwaves)
there could be a large part of personal experiment ... to check the better for your environment (the main default of these antenas is the environment dependancy, especialy with wall/roof...)
73 - Remi - F1MQJ

Re: Apartment antenna question for uBitx #ubitx

Tom, wb6b
 

On Tue, Aug 27, 2019 at 09:58 AM, f1mqj wrote:
aerial-51.com
That is a clever name.

Also:
You could try one of the end-fed non-resonate antenna designs with a 9 to 1 unun. Depending on the bands you want to work you can use a 55 or 40 foot wire. The coax is intentionally a radiating counterpoise, so you need to put a choke on the coax at around 50 foot from the antenna (before it enters your shack). 

My experience with antennas too close to the house is (at least at 150 watts) is transmitting trips some of my GFI protectors and sets off one of my smoke alarms. As well as picks up noise from many of the switching supplies from the various wall warts plugged in around the house. 

QRP is likely to be a big benefit as far as relations with your apartment neighbors are concerned.

Tom, wb6b

Re: Project : Ubitx go box with batteries (topic will be updated upon works done)

Adrien F4IJA
 

Thank you John for this information. I've found that the Max is quite easier to install as you do not need extra components. 

I think I'll try it as it's already ordered :-) 

CAT control of uBITX

John Seboldt K0JD
 

I have a uBITX v3. Have seen references to firmware upgrades of a million types, and thought I saw  reference to CAT control, which would make tuning the radio via digital software possible.

Can somebody guide me through the maze of links - first off, what you do to load new firmware into it (computer software, etc). Second, a firmware version that works with v3 and enables CAT control at a minimum, and maybe some other refinements?

Thanks,

John K0JD
Milwaukee, WI

i2c encoders in matrix with I/O #ubitx

John Scherer
 

I came across an interesting, i2c addressable rotary encoder board that allows you to connect encoders in just about any configuration.  The board has pins for digital or adc I/O, has 256 bytes of eeprom, pads for setting each encoders i2c address, and works from 3.3-5v  I just ordered several boards to play so I'll see how well the work.  For something like the uBitx this could be a easy way to add additional physical I/O (i.e. knobs) for those of us that like knobs ;-)

There is also a video that gives a pretty good overview of how they work.

I did a quick search to see of anyone else posted this but if by chance I miss it, and someone already has this working, let me know.

Re: CAT control of uBITX

Mark Hatch
 

Hi,

KD8CEC's software has CAT control. You can download it via his website: http://www.hamskey.com/2019/04/release-cec-firmware-v1200-for-ubitx.html

Since you have a V3, make sure you download the one for V3.  Match it up with a Nextion screen and you will love the upgrade even more!

73
Mark
AJ6CU

Re: ubitx 5 and boatanchor Collins amp #ubitx #v5 #linear-amp

Dean Souleles
 

Hi Jim,

Gotcha - that makes a lot of sense.  Or if I only want 100-150 watts out I could just use the 2 pill - and leave the Collins for my benchtop station.

Thank you,

Dean
KK4DAS

Re: CAT control of uBITX

John Seboldt K0JD
 

So I take it that you use his uBITX Manager to actually load the stuff? It seems that we have to deduce the step by step instructions. Yeah, have also seen the Nextion screens so will think about that too.

John K0JD

On 8/27/2019 16:03, Mark Hatch wrote:
Hi,

KD8CEC's software has CAT control. You can download it via his website: http://www.hamskey.com/2019/04/release-cec-firmware-v1200-for-ubitx.html

Since you have a V3, make sure you download the one for V3.  Match it up with a Nextion screen and you will love the upgrade even more!

73
Mark
AJ6CU

Re: CAT control of uBITX

Doug W
 

On Tue, Aug 27, 2019 at 05:13 PM, John Seboldt K0JD wrote:
So I take it that you use his uBITX Manager to actually load the stuff? It seems that we have to deduce the step by step instructions.
John,
On the same site KD8CEC has step by step instructions.  http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html  That is written for an older version of his firmware.  Make sure you download the latest.
 
--
www.bitxmap.com

Re: i2c encoders in matrix with I/O #ubitx

Tom, wb6b
 

On Tue, Aug 27, 2019 at 01:59 PM, John Scherer wrote:
I came across an interesting, i2c addressable rotary encoder board
Very clever deign. Also did not know encoders with an RGB LED that could send light down a clear shaft to the knob were available. 

These boards seem to use a lot of I2C addresses, but they claim they are compatible with most or all development boards.

Tom, wb6b

Re: i2c encoders in matrix with I/O #ubitx

John Scherer
 

From what I can tell, each board is an i2c slave and utilizes a single i2c address. However, each board is configurable to use one of 127 possible i2c addresses.  I would assume each board would need a separate i2c address, and with 127 available, I don't think this would be a problem.  Or am I missing something?
--
John - N0CTL - Fulltime RV in a 40' motorhome

Re: ssm2167 board for compression #ubitx #ssm2167

n8yg
 

Hi John, 
I understand completely. 
The value of pot I chose was 50k, and the adjustment point relative to ground is about 10K.. so 1/5 the voltage output of the microphone. Of course this adjustment is after the cap on the board so that I did not adjust the electret bias as well.. but I think you got that.  I found it difficult to solder to the pads without destroying them, but succeeded finally. I started laying out a board with these mods... but who knows if I'll ever get it done. :-) 

I will caution that I discovered that the noise gate and compression.. seem to have an interaction.. but the noise gate certainly works.. and as my good friend says about the compression now.. "Wow Brad that sounds as good if not better than your 100 W rig at 100 Watts"
BTW thanks for your inspiration for using this chip. It really makes the difference for sure. 
I read your notes.. but was frustrated with the compression making little difference between full compression and none.. Now.. there is a huge difference. 
I hope this helps... I have been hoping someone else would give it a try. 

73,
Brad N8YG

Re: i2c encoders in matrix with I/O #ubitx

Tom, wb6b
 

It looked like they mapped 256 I2C address to the various internal registers and the EEPROM. Then had an additional 7 bits of high order I2C addresses. There is an expanded I2C addressing scheme, greater than 7 bits, but I do not know how many libraries support it.

If what they actually did is create a bunch of pseudo registers, then you will need to deal with creating a protocol on top of the I2C protocol. Hope they provide drivers to layer on the pseudo register addressing and handshake, over the I2C protocol, if that is the case.

Tom, wb6b

Re: high pitched wine on 80 and 40 M

jfein2000@...
 

Thanks John,  it is rev 4, 2018 vintage.  It receives on 80 and 40 but the whine in the background is very irritating.  Tried to find any relevant posts by you as noted but without success.  I suspect it is SSB related. 

cheers

jeff

 

 

 

Re: ssm2167 board for compression #ubitx #ssm2167

John (vk2eta)
 

Hi Brad,

Thanks for the information. 
I should be able to give It a go in a week or so and I'll report on the results. 

Even at the high rate of compression/limiting where mine is at present I get reports of "audible compression, but not unpleasant".

But I would like to soften it a little and have the noise gate work properly.

Thanks and 73, John

Re: high pitched wine on 80 and 40 M

John (vk2eta)
 

Hi Jeff,

Here is the link to the thread.

https://groups.io/g/BITX20/topic/8872690#54576

In summary it was the nano's crystal frequency. 

I changed the nano and it solved the issue.

To see if it's related to this issue just touch the nano's crystal or change slightly the BFO's calibration and the tone will change too.

If it doesn't, it's another issue.

Hope that helps.

Cheers, John

Re: CAT control of uBITX

John Seboldt K0JD
 

OK, looks like I have all the info I need, just set a time and take the courage to do it! Thanks

On 8/27/2019 17:30, Doug W wrote:
On Tue, Aug 27, 2019 at 05:13 PM, John Seboldt K0JD wrote:
So I take it that you use his uBITX Manager to actually load the stuff? It seems that we have to deduce the step by step instructions.
John,
On the same site KD8CEC has step by step instructions.  http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html  That is written for an older version of his firmware.  Make sure you download the latest.
 
--
www.bitxmap.com